751
|
Díaz AI, Oulego P, González JM, Laca A, Díaz M. Physico-chemical pre-treatments of anaerobic digestion liquor for aerobic treatment. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 274:111189. [PMID: 32801104 DOI: 10.1016/j.jenvman.2020.111189] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 07/14/2020] [Accepted: 08/01/2020] [Indexed: 06/11/2023]
Abstract
Centrifugation of anaerobically digested sewage sludge gives rise to a solid phase, which could be employed as a fertilizer, and a liquid fraction (ADL), which should be treated before being spilled out. This is not an easy task because this liquor is characterized for presenting high COD (~16000 mg O2/L), high ammonium content (~4000 mg/L) and low biodegradability (BOD5/COD ~0.2). With the objective to pre-treat this aqueous waste before its treatment by means of more traditional aerobic processes, different physico-chemical methods (ultrasound, ozonation, hydrolysis and wet air oxidation) were assessed in this work. Ultrasound and thermal hydrolysis gave solubilizations around 47% and 68% respectively. The best results in terms of total COD removal were obtained when wet air oxidation (8 h, 160 C-200 °C and 6.0 MPa) and ozonation (8 h, 25 °C, 12 g/h O3) techniques were employed achieving COD degradations of 71% and 38%, respectively. The pre-treatment of ADL with the four assayed techniques improved considerably the biodegradability (BOD5/COD) of the effluent, with values around 0.3-0.4, depending on the treatment. The experimental data were successfully fitted by kinetic models and the kinetic constants for the solubilization and degradation steps were obtained. Application of the proposed models can be of interest for the optimization and selection of the most suitable techniques and operational conditions, in each particular case.
Collapse
Affiliation(s)
- Ana Isabel Díaz
- Department of Chemical and Environmental Engineering. University of Oviedo. C/Julián Clavería, s/n, E-33006, Oviedo, Asturias, Spain
| | - Paula Oulego
- Department of Chemical and Environmental Engineering. University of Oviedo. C/Julián Clavería, s/n, E-33006, Oviedo, Asturias, Spain
| | - J Manuel González
- R&D, COGERSA SAU. C/ La Zoreda, s/n, E-33697, Gijón, Asturias, Spain
| | - Adriana Laca
- Department of Chemical and Environmental Engineering. University of Oviedo. C/Julián Clavería, s/n, E-33006, Oviedo, Asturias, Spain.
| | - Mario Díaz
- Department of Chemical and Environmental Engineering. University of Oviedo. C/Julián Clavería, s/n, E-33006, Oviedo, Asturias, Spain
| |
Collapse
|
752
|
Habibi-Yangjeh A, Asadzadeh-Khaneghah S, Feizpoor S, Rouhi A. Review on heterogeneous photocatalytic disinfection of waterborne, airborne, and foodborne viruses: Can we win against pathogenic viruses? J Colloid Interface Sci 2020; 580:503-514. [PMID: 32711201 PMCID: PMC7361121 DOI: 10.1016/j.jcis.2020.07.047] [Citation(s) in RCA: 206] [Impact Index Per Article: 51.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Revised: 07/09/2020] [Accepted: 07/10/2020] [Indexed: 02/07/2023]
Abstract
Microbial pathogenic contaminations have world widely represented a serious health hazard to humans. Viruses, as a member of microbial contaminants, seriously threaten human health due to their high environmental resistance, having small sizes, and causing an extensive range of diseases. Therefore, selecting an appropriate technology to remove viral contaminants from the air, water, and foods is of prominent significance. Traditional methods for viral disinfection have not proven to be highly practical and effective because they need high energy resources and operational expenses. In recent years, semiconductor-based photocatalysis has attracted more attention in the field of microorganism inactivation due to its outstanding performance and mild reaction conditions. Therefore, this review primarily concentrates on the recent development in viral inactivation/disinfection by heterogeneous photocatalysts. Moreover, the photocatalytic viral inactivation of waterborne, airborne, and foodborne viruses is discussed. Given the appealing merits of heterogeneous photocatalytic disinfection of viruses, there is no doubt that this technology will be an impressively active research field and a source of comfort and confidence to humans in battling against viruses.
Collapse
Affiliation(s)
- Aziz Habibi-Yangjeh
- Department of Chemistry, Faculty of Science, University of Mohaghegh Ardabili, Ardabil, Iran; Nanoscience and Nanotechnology Research Group, Mineral and Drinking Waters Research Group, University of Mohaghegh Ardabili, Ardabil, Iran.
| | | | - Solmaz Feizpoor
- Department of Chemistry, Faculty of Science, University of Mohaghegh Ardabili, Ardabil, Iran
| | - Afsar Rouhi
- Department of English Language, Faculty of Literature and Humanities, University of Mohaghegh Ardabili, Ardabil, Iran
| |
Collapse
|
753
|
Metolina P, Lourenço FR, Teixeira ACSC. UVC- and UVC/H 2O 2-Driven nonribosomal peptide antibiotics degradation: application to zinc bacitracin as a complex emerging contaminant. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2020; 56:97-112. [PMID: 33174789 DOI: 10.1080/10934529.2020.1841499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 10/17/2020] [Accepted: 10/20/2020] [Indexed: 06/11/2023]
Abstract
Zinc bacitracin (Zn-Bc) belongs to the group of nonribosomal peptide antibiotics (NRPA), comprising a mixture of non-biodegradable congeners characterized by complex structures containing cyclic, polycyclic, and branched chains. However, reports on the use of AOPs for the degradation of NRPA are non-existent. In this context, the present work investigated the photodegradation of Zn-Bc in aqueous solution by direct photolysis and the UVC/H2O2 process. The effects of the specific UVC photon emission rate and initial H2O2 concentration were studied following a Doehlert-design response surface approach. The results showed that all congeners photolyzed at the highest UVC doses in the absence of hydrogen peroxide, with a calculated quantum yield of 0.0141 mol Zn-Bc mol photons-1. However, no TOC removal was observed after 120 minutes of irradiation, suggesting the disruption of the peptide bonds in the antibiotic molecules without significant changes in the amino acid residues. The addition of H2O2 substantially accelerated Zn-Bc photodegradation, resulting in a remarkable removal of up to 71% of TOC. Most importantly, the antimicrobial activity against Staphylococcus aureus could be completely removed by both treatments. These findings point out that the UVC/H2O2 process can be straightly engineered for the treatment of metalloantibiotics-containing wastewater in pharmaceutical facilities.
Collapse
Affiliation(s)
- Patrícia Metolina
- Research Group in Advanced Oxidation Processes (AdOx), Chemical Systems Engineering Center - Department of Chemical Engineering, University of São Paulo, São Paulo, Brazil
| | | | - Antonio Carlos Silva Costa Teixeira
- Research Group in Advanced Oxidation Processes (AdOx), Chemical Systems Engineering Center - Department of Chemical Engineering, University of São Paulo, São Paulo, Brazil
| |
Collapse
|
754
|
Rey-García F, Sieira BJ, Bao-Varela C, Leis JR, Angurel LA, Quintana JB, Rodil R, de la Fuente GF. Can UV-C laser pulsed irradiation be used for the removal of organic micropollutants from water? Case study with ibuprofen. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 742:140507. [PMID: 32629255 DOI: 10.1016/j.scitotenv.2020.140507] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 06/15/2020] [Accepted: 06/23/2020] [Indexed: 06/11/2023]
Abstract
A novel approach based on the direct pulsed irradiation of UV-C light onto ibuprofen (IBP) solutions was evaluated in this work, as proof of concept for the direct removal of micropollutants. The experiments confirmed that laser irradiation is able to completely degrade IBP in 15 min in distilled water, with a DOC depletion of ca. 25% and with transformation products (TPs) remaining in solution and estimated to represent ca. 10% of the initial IBP concentration. In wastewater spiked samples, removal efficiency is slightly lower but still significant (ca. 5% IBP remaining after 15 min). Hence, this work suggests that low power solid state pulsed lasers, emitting at 266 nm wavelength, show promise for the removal of these type of micropollutants from water. These results open new opportunities towards the development of chemical-free water treatment methods based on direct, selective irradiation using state of the art, miniaturized laser devices.
Collapse
Affiliation(s)
- Francisco Rey-García
- Instituto de Ciencia de Materiales de Aragón (CSIC-Universidad de Zaragoza), c/María de Luna 3, 50018 Zaragoza, Spain; Unidad Asociada de Microóptica & Óptica GRIN, "Photonics4life" group, Universidade de Santiago de Compostela, c/Campus Sur s/n, 15782 Santiago de Compostela, Spain.
| | - Benigno José Sieira
- Department of Analytical Chemistry, Nutrition and Food Sciences, IAQBUS - Institute of Research on Chemical and Biological Analysis, Universidade de Santiago de Compostela, Constantino Candeira S/N, 15782 Santiago de Compostela, Spain
| | - Carmen Bao-Varela
- Unidad Asociada de Microóptica & Óptica GRIN, "Photonics4life" group, Universidade de Santiago de Compostela, c/Campus Sur s/n, 15782 Santiago de Compostela, Spain
| | - José Ramón Leis
- Unidad Asociada de Microóptica & Óptica GRIN, "Photonics4life" group, Universidade de Santiago de Compostela, c/Campus Sur s/n, 15782 Santiago de Compostela, Spain.
| | - Luis Alberto Angurel
- Instituto de Ciencia de Materiales de Aragón (CSIC-Universidad de Zaragoza), c/María de Luna 3, 50018 Zaragoza, Spain
| | - José Benito Quintana
- Department of Analytical Chemistry, Nutrition and Food Sciences, IAQBUS - Institute of Research on Chemical and Biological Analysis, Universidade de Santiago de Compostela, Constantino Candeira S/N, 15782 Santiago de Compostela, Spain
| | - Rosario Rodil
- Department of Analytical Chemistry, Nutrition and Food Sciences, IAQBUS - Institute of Research on Chemical and Biological Analysis, Universidade de Santiago de Compostela, Constantino Candeira S/N, 15782 Santiago de Compostela, Spain
| | - Germán Francisco de la Fuente
- Instituto de Ciencia de Materiales de Aragón (CSIC-Universidad de Zaragoza), c/María de Luna 3, 50018 Zaragoza, Spain.
| |
Collapse
|
755
|
Zhen Y, Zhang Q, Zhang X, Zhang G, Chen X, Zhao C. A novel tubular up-flow magnetic film photocatalytic system optimized by main factors control for efficient removal of chlorophenols wastewater. JOURNAL OF HAZARDOUS MATERIALS 2020; 398:122963. [PMID: 32512454 DOI: 10.1016/j.jhazmat.2020.122963] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 04/29/2020] [Accepted: 05/12/2020] [Indexed: 06/11/2023]
Abstract
Chlorophenols (CPs) are still used as raw material or intermediate in some industries. Photocatalytic oxidation is free from secondary pollution, but the efficiency is restricted by some main factors. In this study, a novel high efficiency tubular up-flow magnetic film (TUMF) photocatalytic system was investigated based on the magnetic lanthanum doping core-shell Fe3O4@SiO2@TiO2 (La-FST) nanoparticles. When the dosage of La-FST was 0.4 g/L, the flow velocity was 94.2 mL/min, and the circulated irradiation of 15 W maintained 40 min, the average removal rate of 2,4-dichlorophenol (2,4-DCP) was reduced significantly from 10 mg/L to 0.0803 mg/L by TUMF system, meeting the limits of the particular items (0.093 mg/L) from national environmental quality standards for surface water, avoiding the problem of photocatalyst separation and loss. The photoinduced holes (h+) was the key active radical to oxidize 2,4-DCP, and the main factors of TUMF system could be well controlled to achieve satisfactory effluent quality. A prediction method of photocatalytic reaction time in a multistage series TUMF system was established to remove 2,4-DCP from 100 mg/L to 0.5 mg/L, saving 86 min. The novel high-efficiency TUMF system provides a technical selection for the photocatalytic degradation of CPs and other refractory organics.
Collapse
Affiliation(s)
- Yichen Zhen
- College of Chemistry and Environmental Science, Hebei University, Key Laboratory of Analytical Science and Technology of Hebei Province, Baoding 071002, China.
| | - Qiang Zhang
- College of Chemistry and Environmental Science, Hebei University, Key Laboratory of Analytical Science and Technology of Hebei Province, Baoding 071002, China.
| | - Xiaoyan Zhang
- College of Chemistry and Environmental Science, Hebei University, Key Laboratory of Analytical Science and Technology of Hebei Province, Baoding 071002, China.
| | - Guanteng Zhang
- College of Chemistry and Environmental Science, Hebei University, Key Laboratory of Analytical Science and Technology of Hebei Province, Baoding 071002, China.
| | - Xiaoxin Chen
- College of Chemistry and Environmental Science, Hebei University, Key Laboratory of Analytical Science and Technology of Hebei Province, Baoding 071002, China.
| | - Chunxia Zhao
- College of Chemistry and Environmental Science, Hebei University, Key Laboratory of Analytical Science and Technology of Hebei Province, Baoding 071002, China.
| |
Collapse
|
756
|
Sun Y, Xie H, Zhou C, Wu Y, Pu M, Niu J. The role of carbonate in sulfamethoxazole degradation by peroxymonosulfate without catalyst and the generation of carbonate racial. JOURNAL OF HAZARDOUS MATERIALS 2020; 398:122827. [PMID: 32768810 DOI: 10.1016/j.jhazmat.2020.122827] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 04/26/2020] [Accepted: 04/27/2020] [Indexed: 06/11/2023]
Abstract
Peroxymonosulfate (PMS) can be activated by various catalysts to degrade organic contaminants in wastewater treatment processes. In this research, the co-activation of PMS by sulfamethoxazole (SMX) and carbonate is investigated. The results show that SMX can be degraded in situ, and the main reactive oxygen species are singlet oxygen and carbonate radicals. Only singlet oxygen is detected when SMX is degraded by PMS without carbonate. However, both carbonate radicals and hydroxyl radicals are measured in the presence of carbonate. Among which, hydroxyl radicals are identified by electron paramagnetic resonance spectroscopy method, and carbonate radicals are confirmed by radical quenching experiments, as well as the variation of SMX degradation kinetic and the appreance of carbonyldioxy derivatives by-products in the presence of carbonate anions. Based on this phenomenon, it is proposed that carbonate can enhance the decomposition of PMS and the generation of secondary free radicals (carbonate radicals). Thus carbonate radicals can enhance the oxidizability for sulfonamide antibiotics in the PMS-based advanced oxidation systems. These results suggest that the addition of carbonate is an important enhancement method for the treatment of sulfonamide antibiotics in water.
Collapse
Affiliation(s)
- Yanlong Sun
- Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Guangdong, China
| | - Hongbin Xie
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), Dalian University of Technology, Dalian 116024, China
| | - Chengzhi Zhou
- Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Guangdong, China
| | - Yuandong Wu
- Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Guangdong, China
| | - Mengjie Pu
- Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Guangdong, China
| | - Junfeng Niu
- Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Guangdong, China.
| |
Collapse
|
757
|
Li B, Li C, Qu R, Wu N, Qi Y, Sun C, Zhou D, Wang Z. Effects of common inorganic anions on the ozonation of polychlorinated diphenyl sulfides on silica gel: Kinetics, mechanisms, and theoretical calculations. WATER RESEARCH 2020; 186:116358. [PMID: 32898788 DOI: 10.1016/j.watres.2020.116358] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Revised: 08/07/2020] [Accepted: 08/29/2020] [Indexed: 06/11/2023]
Abstract
In this work, the ozonation properties of 2,2',3',4,5-pentachlorodiphenyl sulfide (PeCDPS) was systematically studied, with special emphasis on the underlying mechanism for the effects of inorganic ions. Kinetic experiments show that common ions can significantly reduce the oxidative properties of ozone, except for SO32- and Cu2+. The inhibition effect of anions has been explained through the scavenging effect of free radicals and the generation of other free radicals with weaker oxidation potentials, but no research has reported on the effect of free radicals generated by anions on the degradation pathway. However, SO32- and Cu2+ exerted a promoting effect through enhanced formation of ·OH via the hydrolysis effect and the catalyzed decomposition of O3, respectively. According to the intermediate products identified by high performance liquid chromatography-mass spectrometry/mass spectrometry (HPLC-MS/MS) analysis, direct oxidation of S atom, substitution of Cl atom with -OH group, and hydroxylation of the benzene ring were commonly observed. The addition of NO2- and SO32- produced new free radicals like ·NO2, ·SO3 and ·SO4-, which would attack the parent compound or its primary product, thus influencing the degradation efficiency and pathways. The radicals initiated reactions and the structures of the corresponding products were further rationalized by density functional theory (DFT) calculations. These findings provide new insights into the effects of common anions on ozone oxidation of organic compounds.
Collapse
Affiliation(s)
- Beibei Li
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Jiangsu Nanjing 210023, PR China
| | - Chenguang Li
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Jiangsu Nanjing 210023, PR China
| | - Ruijuan Qu
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Jiangsu Nanjing 210023, PR China
| | - Nannan Wu
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Jiangsu Nanjing 210023, PR China
| | - Yumeng Qi
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Jiangsu Nanjing 210023, PR China
| | - Cheng Sun
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Jiangsu Nanjing 210023, PR China
| | - Dongmei Zhou
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Jiangsu Nanjing 210023, PR China
| | - Zunyao Wang
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Jiangsu Nanjing 210023, PR China.
| |
Collapse
|
758
|
Thakur P, Raizada P, Singh P, Kumar A, Khan AAP, Asiri AM. Exploring recent advances in silver halides and graphitic carbon nitride-based photocatalyst for energy and environmental applications. ARAB J CHEM 2020. [DOI: 10.1016/j.arabjc.2020.04.026] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
|
759
|
Stefanello Cadore J, Fabro LF, Garcia Maraschin T, de Souza Basso NR, Rodrigues Pires MJ, Barbosa Brião V. Bibliometric approach to the perspectives and challenges of membrane separation processes to remove emerging contaminants from water. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2020; 82:1721-1741. [PMID: 33201839 DOI: 10.2166/wst.2020.450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The presence of contaminants in water is concerning due to the potential impacts on human health and the environment, and ingested contaminants cause harm in various ways. The conventional water treatment systems are not efficient to remove these contaminants. Therefore, novel techniques and materials for the removal of contaminants are increasingly being developed. The separation process using modified membranes can remove these micropollutants; therefore, they have attracted significant research attention. Among the materials used for manufacturing of these membranes, composites based on graphene oxide and reduced graphene oxide are preferred owing to their promising properties, such as mechanical resistance, thermal and chemical stability, antifouling capacity, water permeability, high thermal and electrical conductivity, high optical transmittance and high surface area. Membrane separation processes (MSP) can be used as secondary or tertiary treatment during the supply of wastewater. However, the efficient and accessible applications of these technologies are challenging. This study aims to demonstrate the main concepts of membrane separation processes and their application in the removal of emerging contaminants. This study reports bibliometric mapping, relevant data on studies using membranes as water treatment processes, and their viability in industrial applications. The main challenges and perspectives of these technologies are discussed in detail as well.
Collapse
Affiliation(s)
- Jéssica Stefanello Cadore
- University of Passo Fundo (UPF), Faculty of Engineering and Architecture (FEAR), Postgraduate Program in Civil and Environmental Engineering (PPGEng), Passo Fundo, RS, Brazil E-mail:
| | - Lucas Fernando Fabro
- Postgraduate Program in Technology and Materials Engineering, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Porto Alegre, RS, Brazil
| | - Thuany Garcia Maraschin
- Postgraduate Program in Technology and Materials Engineering, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Porto Alegre, RS, Brazil
| | - Nara Regina de Souza Basso
- Postgraduate Program in Technology and Materials Engineering, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Porto Alegre, RS, Brazil
| | - Marçal José Rodrigues Pires
- Postgraduate Program in Technology and Materials Engineering, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Porto Alegre, RS, Brazil
| | - Vandré Barbosa Brião
- University of Passo Fundo (UPF), Faculty of Engineering and Architecture (FEAR), Postgraduate Program in Civil and Environmental Engineering (PPGEng), Passo Fundo, RS, Brazil E-mail:
| |
Collapse
|
760
|
Chen W, He C, Gu Z, Wang F, Li Q. Molecular-level insights into the transformation mechanism for refractory organics in landfill leachate when using a combined semi-aerobic aged refuse biofilter and chemical oxidation process. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 741:140502. [PMID: 32887006 DOI: 10.1016/j.scitotenv.2020.140502] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Revised: 06/22/2020] [Accepted: 06/23/2020] [Indexed: 06/11/2023]
Abstract
Landfill leachate contains high concentrations of complex organic matter (OM) that can severely impact the ecological environment. If landfill leachate is to be treated using a combined "biological + advanced treatment" process, the molecular information of OM must be investigated to optimize the operation parameters of the combined process and maximize the removal of organic pollutants. This study applied ultra-high resolution mass spectroscopy to investigate the degradation and transformation characteristics of refractory OM in mature landfill leachate at the molecular level (m/z = 150-800) during biological treatment (i.e., semi-aerobic aged refuse biofilter, SAARB) and subsequent chemical oxidation (i.e., the Fenton process and ozonation). After SAARB treatment, the polycyclic aromatics (aromatic index, AI > 0.66) and polyphenol (0.66 ≥ AI > 0.50) contents increased, and the highly unsaturated phenolic compounds (AI ≤ 0.50 and H/C < 1.5), which have a high bioavailability, were mostly removed. Compared with raw leachate, SAARB effluent (i.e., SAARB leachate) contained fewer organics with short carbon chains, more organics with long carbon chains, an elevated condensation degree for organics and, thus, a considerably reduced biodegradability. Although both the Fenton and ozonation processes could remove many of the polycyclic aromatics and polyphenols, ozone produced considerable amounts of aliphatic compounds with high bioavailability. Compared to ozonation, the Fenton process utilized the hydroxyl radical to non-selectively react with OM and produced better mineralization results.
Collapse
Affiliation(s)
- Weiming Chen
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China
| | - Chen He
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
| | - Zhepei Gu
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China
| | - Fan Wang
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China
| | - Qibin Li
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China.
| |
Collapse
|
761
|
Li J, Zhu K, Li R, Fan X, Lin H, Zhang H. The removal of azo dye from aqueous solution by oxidation with peroxydisulfate in the presence of granular activated carbon: Performance, mechanism and reusability. CHEMOSPHERE 2020; 259:127400. [PMID: 32593002 DOI: 10.1016/j.chemosphere.2020.127400] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Revised: 06/07/2020] [Accepted: 06/10/2020] [Indexed: 06/11/2023]
Abstract
Granular activated carbon (GAC) was used as catalyst for the activation of peroxydisulfate (PDS) to decolorize and degrade Acid Orange 7 (AO7) in water. EPR spectra and radical quencher experiments were employed to identify the active species for AO7 oxidation in the PDS/GAC system. Linear sweep voltammetry (LSV) and chronoamperometry test were carried out to identify the contribution of nonradical mechanism for AO7 decay. The investigation of crucial operational parameters on the decolorization indicated 100 mg/L AO7 can be almost totally decolorized in a broad range of pH. Common inorganic anions adversely affect the AO7 decolorization process and the inhibition was in the order of: HCO3- > H2PO4- > SO42- > Cl- > NO3-. UV-vis spectra showed the destruction of the aromatic moiety of AO7 molecule during the oxidation reaction of the PDS/GAC system. The transformation of nitrogen related to the azo bond in AO7 molecule in this system was observed by monitoring the released N-containing inorganic ions. Recycle experiments showed GAC cannot be reused directly but its catalytic ability can be restored by using electrochemical method.
Collapse
Affiliation(s)
- Jing Li
- Department of Environmental Science and Engineering, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan, 430079, China
| | - Kangmeng Zhu
- Department of Environmental Science and Engineering, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan, 430079, China
| | - Ruimeng Li
- Department of Environmental Science and Engineering, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan, 430079, China
| | - Xiaohui Fan
- Department of Environmental Science and Engineering, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan, 430079, China
| | - Heng Lin
- Department of Environmental Science and Engineering, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan, 430079, China.
| | - Hui Zhang
- Department of Environmental Science and Engineering, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan, 430079, China.
| |
Collapse
|
762
|
Li M, Sun J, Han D, Wei B, Mei Q, An Z, Wang X, Cao H, Xie J, He M. Theoretical investigation on the contribution of HO, SO 4- and CO 3- radicals to the degradation of phenacetin in water: Mechanisms, kinetics, and toxicity evaluation. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 204:110977. [PMID: 32739673 DOI: 10.1016/j.ecoenv.2020.110977] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 06/22/2020] [Accepted: 06/25/2020] [Indexed: 06/11/2023]
Abstract
Indirect oxidation induced by reactive free radicals, such as hydroxyl radical (HO), sulfate radical (SO4-) and carbonate radical (CO3-), plays an important or even crucial role in the degradation of micropollutants. Thus, the coadjutant degradation of phenacetin (PNT) by HO, SO4- and CO3-, as well as the synergistic effect of O2 on HO and HO2 were studied through mechanism, kinetics and toxicity evaluation. The results showed that the degradation of PNT was mainly caused by radical adduct formation (RAF) reaction (69% for Г, the same as below) and H atom transfer (HAT) reaction (31%) of HO. For the two inorganic anionic radicals, SO4- initiated PNT degradation by sequential radical addition-elimination (SRAE; 55%), HAT (28%) and single electron transfer (SET; 17%) reactions, while only by HAT reaction for CO3-. The total initial reaction rate constants of PNT by three radicals were in the order: SO4- > HO > CO3-. The kinetics of PNT degradation simulated by Kintecus program showed that UV/persulfate could degrade target compound more effectively than UV/H2O2 in ultrapure water. In the subsequent reaction of PNT with O2, HO and HO2, the formation of mono/di/tri-hydroxyl substitutions and unsaturated aldehydes/ketones/alcohols were confirmed. The results of toxicity assessment showed that the acute and chronic toxicity of most products to fish increased and to daphnia decreased, and acute toxicity to green algae decreased while chronic toxicity increased.
Collapse
Affiliation(s)
- Mingxue Li
- Environment Research Institute, Shandong University, Qingdao, 266237, PR China
| | - Jianfei Sun
- Environment Research Institute, Shandong University, Qingdao, 266237, PR China
| | - Dandan Han
- School of Chemistry and Chemical Engineering, Heze University, Heze, 274015, PR China
| | - Bo Wei
- Environment Research Institute, Shandong University, Qingdao, 266237, PR China
| | - Qiong Mei
- Environment Research Institute, Shandong University, Qingdao, 266237, PR China
| | - Zexiu An
- Environment Research Institute, Shandong University, Qingdao, 266237, PR China
| | - Xueyu Wang
- Environment Research Institute, Shandong University, Qingdao, 266237, PR China
| | - Haijie Cao
- Institute of Materials for Energy and Environment, School of Materials Science and Engineering, Qingdao University, Qingdao, 266071, PR China
| | - Ju Xie
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, PR China
| | - Maoxia He
- Environment Research Institute, Shandong University, Qingdao, 266237, PR China.
| |
Collapse
|
763
|
|
764
|
Raufeisen S, Neumeister P, Buchheim JR, Stelter M, Braeutigam P. Pyrocatalytic oxidation - strong size-dependent poling effect on catalytic activity of pyroelectric BaTiO 3 nano- and microparticles. Phys Chem Chem Phys 2020; 22:23464-23473. [PMID: 32960200 DOI: 10.1039/d0cp03158e] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Pyrocatalysis is an emerging advanced oxidation process for wastewater remediation with the potential for thermal energy harvesting and utilization. Although several studies explored the potential of new pyrocatalyst materials to degrade harmful organic water pollutants, the role of important material properties and electric poling procedures on the pyrocatalytic activity is still unclear. In this work, we investigate the interdependence between particle size, electric poling and pyrocatalytic activity of BaTiO3 powders with nominal particle sizes of 100, 200 and 500 nm by using the dichlorofluorescein redox assay. Depending on the particle size, the influence of surface area or phase composition on the pyrocatalytic activity predominates. Moreover, we demonstrate that poling of pyrocatalysts leads to a strong size-dependent increase of pyrocatalytic activity. This poling effect increases with particle size up to +247% and can be explained with size-dependent changes in phase composition and domain structure. Combining all results, the progression of the pyrocatalytic activity as a function of particle size was derived and a future strategy for maximizing the catalytic performance of pyrocatalysts was developed. This study greatly improves the understanding about the role of important material properties and electric poling on pyrocatalytic activity, thus enabling an effective catalyst design. With the help of highly active catalysts, the pyrocatalytic process can take the next step in its development into a new and energy-efficient advanced oxidation process for water remediation.
Collapse
Affiliation(s)
- Sascha Raufeisen
- Institute of Technical Chemistry and Environmental Chemistry, Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany. and Center for Energy and Environmental Chemistry (CEEC Jena), Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany
| | - Peter Neumeister
- Fraunhofer IKTS, Fraunhofer Institute for Ceramic Technologies and Systems, Winterbergstraße 28, 01277 Dresden, Germany
| | - Johannes R Buchheim
- Institute of Technical Chemistry and Environmental Chemistry, Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany. and Center for Energy and Environmental Chemistry (CEEC Jena), Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany
| | - Michael Stelter
- Institute of Technical Chemistry and Environmental Chemistry, Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany. and Center for Energy and Environmental Chemistry (CEEC Jena), Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany and Fraunhofer IKTS, Fraunhofer Institute for Ceramic Technologies and Systems, Michael-Faraday-Straße 1, 07629 Hermsdorf, Germany
| | - Patrick Braeutigam
- Institute of Technical Chemistry and Environmental Chemistry, Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany. and Center for Energy and Environmental Chemistry (CEEC Jena), Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany
| |
Collapse
|
765
|
Ramirez-Sanchez IM, Apul OG, Saleh NB. Photocatalytic activity of micron-scale brass on emerging pollutant degradation in water: mechanism elucidation and removal efficacy assessment. RSC Adv 2020; 10:39931-39942. [PMID: 35515381 PMCID: PMC9057414 DOI: 10.1039/d0ra06153k] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Accepted: 10/20/2020] [Indexed: 12/14/2022] Open
Abstract
Alloys or smelted metal mixtures have served as cornerstones of human civilization. The advent of smelted copper and tin, i.e., bronze, in the 4th millennium B.C. in Mesopotamia has pioneered the preparation of other metal composites, such as brass (i.e., mixture of copper and zinc), since the bronze age. The contemporary use of these alloys has expanded beyond using their physical strength. The catalytic chemistry of micron-scale brass or copper–zinc alloy can be utilized to effectively degrade emerging contaminants (ECs) in water, which are presenting significant risks to human health and wildlife. Here, we examine the photocatalytic activity of a commercially available micro-copper–zinc alloy (KDF® 55, MicroCuZn), made with earth abundant metals, for oxidative removal of two ECs. The micron-scale brass is independently characterized for its morphology, which confirms that it has the β-brass phase and that its plasmonic response is around 475 nm. Estriol (E3), a well-known EC, is removed from water with ultraviolet (UV) radiation catalyzed by MicroCuZn and H2O2–MicroCuZn combinations. The synergy between H2O2, UV, and MicroCuZn enhances hydroxyl radical (˙OH) generation and exhibit a strong pseudo-first-order kinetic degradation of E3 with a decay constant of 1.853 × 10−3 min−1 (r2 = 0.999). Generation of ˙OH is monitored with N,N-dimethyl-4-nitrosoaniline (pNDA) and terephthalic acid (TA), which are effective ˙OH scavengers. X-ray photoelectron spectroscopy analysis has confirmed ZnO/CuO–Cu2O film formation after UV irradiation. The second EC studied here is Δ9-tetrahydrocannabinol or THC, a psychotropic compound commonly consumed through recreational or medicinal use of marijuana. The exceptionally high solids–water partitioning propensity of THC makes adsorption the dominant removal mechanism, with photocatalysis potentially supporting the removal efficacy of this compound. These results indicate that MicroCuZn can be a promising oxidative catalyst especially for degradation of ECs, with possible reusability of this historically significant material with environmentally-friendly attributes. Micron-scale brass is a catalyst that can be activated with ultraviolet radiation to remove emerging contaminants from water via oxidation by hydroxyl radicals.![]()
Collapse
Affiliation(s)
- Irwing M Ramirez-Sanchez
- Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin Austin TX 78712 USA +1 512 471 9175
| | - Onur G Apul
- Civil and Environmental Engineering, University of Maine Orono ME 04469 USA
| | - Navid B Saleh
- Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin Austin TX 78712 USA +1 512 471 9175
| |
Collapse
|
766
|
Wang X, Xia J, Ding S, Zhang S, Li M, Shang Z, Lu J, Ding J. Removing organic matters from reverse osmosis concentrate using advanced oxidation-biological activated carbon process combined with Fe 3+/humus-reducing bacteria. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 203:110945. [PMID: 32684517 DOI: 10.1016/j.ecoenv.2020.110945] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Revised: 06/19/2020] [Accepted: 06/22/2020] [Indexed: 06/11/2023]
Abstract
The high-concentration wastewater produced in the industrial reverse osmosis (RO) process contains a large amount of refractory organic matters, which will have serious impacts on the natural environment and human health. Among them, contaminants can be transformed by humus-reducing bacteria based on humus. In this study, O3- assisted UV-Fenton method was applied as pretreatment. Biological activated carbon (BAC) technology in which humus-reducing bacteria were the dominant bacteria, enhanced by electron donor and Fe3+, was used to dispose of RO concentrate (ROC). The results showed that water treatment process combining oxidation with biological filtration had a positive effect on the removal of stubborn contaminants in ROC. The system was strengthened by adding electron donor and Fe3+, and the chemical oxygen demand (COD) removal efficiency was up to 80.1%. However, when the removal efficiency of UV254 absorbing pollutants reached optimal value (87.3%), that means only Fe3+ was added.
Collapse
Affiliation(s)
- Xiaoyan Wang
- Department of Resources and Environmental Engineering, Shandong University of Technology, Zibo, 255000, China
| | - Jiaohui Xia
- Department of Resources and Environmental Engineering, Shandong University of Technology, Zibo, 255000, China; Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, Jiangsu Province, China
| | - Shaoxuan Ding
- Faculty of Science, University of Melbourne, Parkville, Victoria, 3010, Australia
| | - Shuo Zhang
- College of Engineering, Northeastern University, Boston, 02115, UK
| | - Menghong Li
- Department of Resources and Environmental Engineering, Shandong University of Technology, Zibo, 255000, China
| | - Zhenxiao Shang
- Department of Resources and Environmental Engineering, Shandong University of Technology, Zibo, 255000, China
| | - Jie Lu
- Department of Resources and Environmental Engineering, Shandong University of Technology, Zibo, 255000, China.
| | - Jincheng Ding
- College of Chemical Engineering, Shandong University of Technology, Zibo, 255000, China
| |
Collapse
|
767
|
Khankhasaeva ST, Badmaeva SV. Removal of p-aminobenzenesulfanilamide from water solutions by catalytic photo-oxidation over Fe-pillared clay. WATER RESEARCH 2020; 185:116212. [PMID: 32750567 DOI: 10.1016/j.watres.2020.116212] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Revised: 07/16/2020] [Accepted: 07/20/2020] [Indexed: 06/11/2023]
Abstract
The catalytic photo-oxidation of p-aminobenzenesulfanilnamide (ABS) with hydrogen peroxide in the presence of Fe-pillared clay as heterogeneous catalyst has been investigated under UV-irradiation (λmax = 254 nm). Fe-pillared clay was synthesized by intercalating the iron polyhydroxycomplexes into the interlayer space of a natural layered aluminosilicate - montmorillonite and a subsequent heat treatment at 500 °C. The catalyst was characterized by chemical analysis, low temperature nitrogen adsorption and XRD. The kinetics of photocatalytic oxidative degradation of ABS in aqueous solutions under various experimental conditions was studied. The dependence of the photo-oxidation rate on such experimental factors as pH, hydrogen peroxide concentration and catalyst content was established. The conversion of ABS was 100% and the mineralization efficiency was 52.3% at optimal conditions. The intermediate products of ABS photo-oxidation identified by HPLC were a sulfanilic acid, benzenesulfonamide, benzenesulfonic acid, hydroquinone, pyrocatechol, benzoquinone and aliphatic acids. Fe-pillared clay remained highly active in three consecutive catalytic cycles without regeneration. The results of the study suggested that the heterogeneous photo-system «Fe-pillared clay/H2O2/UV» was effective in the oxidative degradation of aminobenzenesulfanilnamide. This system may be of interest for use in organic wastewater treatment processes.
Collapse
Affiliation(s)
- Sesegma Ts Khankhasaeva
- Baikal Institute of Nature Management of Siberian Branch of the Russian Academy of Sciences, 6, Sakhyanova St., Ulan-Ude, 670047, Russia.
| | - Sayana V Badmaeva
- Baikal Institute of Nature Management of Siberian Branch of the Russian Academy of Sciences, 6, Sakhyanova St., Ulan-Ude, 670047, Russia
| |
Collapse
|
768
|
Chen H, Huang M, Liu Y, Meng L, Ma M. Functionalized electrospun nanofiber membranes for water treatment: A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 739:139944. [PMID: 32535464 DOI: 10.1016/j.scitotenv.2020.139944] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 05/31/2020] [Accepted: 06/02/2020] [Indexed: 06/11/2023]
Abstract
Electrospun nanofiber membranes (ENMs) have high porosity, high specific surface area and unique interconnected structure. It has huge advantages and potential in the treatment and recycling of wastewater. In addition, ENMs can be easily functionalized by combining multifunctional materials to achieve different water treatment effects. Based on this, this review summarizes the preparation of functionalized ENMs and its detailed application in the field of water treatment. First, the process and influence factors of electrospinning process are introduced. ENMs with high porosity, thin and small fiber diameter have better performance. Secondly, the modification methods of ENMs are analyzed. Pre-electrospinning and post-electrospinning modification technology can prepare specific functionalized ENMs. Subsequently, functionalized ENMs show water treatment capabilities such as separation, adsorption, photocatalysis, and antimicrobial. Subsequently, the application of functionalized ENMs in water treatment capabilities such as separation, adsorption, photocatalysis, and antimicrobial capabilities were listed. Finally, we also made some predictions about the future development direction of ENMs in water treatment, and hope this article can provide some clues and guidance for the research of ENMs in water treatment.
Collapse
Affiliation(s)
- Haisheng Chen
- Key Laboratory of Science & Technology of Eco-Textile, Ministry of Education, Donghua University, Shanghai 201620, China; Aerospace Kaitian Environmental Technology Co., Ltd, Changsha 410100, China
| | - Manhong Huang
- Key Laboratory of Science & Technology of Eco-Textile, Ministry of Education, Donghua University, Shanghai 201620, China; College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China.
| | - Yanbiao Liu
- College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China
| | - Lijun Meng
- College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China
| | - Mengdie Ma
- College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China
| |
Collapse
|
769
|
Organic Degradation Potential of Real Greywater Using TiO2-Based Advanced Oxidation Processes. WATER 2020. [DOI: 10.3390/w12102811] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In keeping with the circular economy approach, reclaiming greywater (GW) is considered a sustainable approach to local reuse of wastewater and a viable option to reduce household demand for freshwater. This study investigated the mineralization of total organic carbon (TOC) in GW using TiO2-based advanced oxidation processes (AOPs) in a custom-built stirred tank reactor. The combinations of H2O2, O3, and immobilized TiO2 under either dark or UVA irradiation conditions were systematically evaluated—namely TiO2/dark, O3/dark (ozonation), H2O2/dark (peroxidation), TiO2/UVA (photocatalysis), O3/UVA (Ozone photolysis), H2O2/UVA (photo-peroxidation), O3/TiO2/dark (catalytic ozonation), O3/TiO2/UVA (photocatalytic ozonation), H2O2/TiO2/dark, H2O2/TiO2/UVA, H2O2/O3/dark (peroxonation), H2O2/O3/UVA (photo-peroxonation), H2O2/O3/TiO2/dark (catalytic peroxonation), and H2O2/O3/TiO2/UVA (photocatalytic peroxonation). It was found that combining different treatment methods with UVA irradiation dramatically enhanced the organic mineralization efficiency. The optimum TiO2 loading in this study was observed to be 0.96 mg/cm2 with the highest TOC removal (54%) achieved using photocatalytic peroxonation under optimal conditions (0.96 mg TiO2/cm2, 25 mg O3/min, and 0.7 H2O2/O3 molar ratio). In peroxonation and photo-peroxonation, the optimal H2O2/O3 molar ratio was identified to be a critical efficiency parameter maximizing the production of reactive radical species. Increasing ozone flow rate or H2O2 dosage was observed to cause an efficiency inhibition effect. This lab-based study demonstrates the potential for combined TiO2-AOP treatments to significantly reduce the organic fraction of real GW, offering potential for the development of low-cost systems permitting safe GW reuse.
Collapse
|
770
|
Nishizawa S, Matsushita T, Matsui Y, Shirasaki N. Formation of disinfection by-products from coexisting organic matter during vacuum ultraviolet (VUV) or ultraviolet (UV) treatment following pre-chlorination and their fates after post-chlorination. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 737:140300. [PMID: 32783868 DOI: 10.1016/j.scitotenv.2020.140300] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 06/12/2020] [Accepted: 06/15/2020] [Indexed: 06/11/2023]
Abstract
Vacuum ultraviolet (VUV) treatment is a promising advanced oxidation process for the removal of organic contaminants during water treatment. Here, we investigated the formation of disinfection by-products from coexisting organic matter during VUV or ultraviolet (UV) treatment following pre-chlorination, and their fates after post-chlorination, in a standard Suwannee River humic acid water and a natural lake water. VUV treatment after pre-chlorination decreased the total trihalomethane (THM) concentration but increased total aldehyde and chloral hydrate concentrations; total haloacetic acid (HAA) and haloacetonitrile (HAN) concentrations did not change. UV treatment after pre-chlorination produced similar changes in the by-products as those observed for VUV treatment, with the exception that the total THM concentration was not changed, and the total HAN concentration was increased. The final concentrations of by-products after post-chlorination were increased by VUV or UV treatment, except for the total HAA concentration, which remained unchanged after UV treatment. The increases were greater after VUV treatment than after UV treatment, probably because the larger amount of hydroxyl radicals generated during VUV treatment compared with during UV treatment transformed coexisting organic matter into precursors of by-products that were then converted to by-products during post-chlorination.
Collapse
Affiliation(s)
- Shota Nishizawa
- Graduate School of Engineering, Hokkaido University, N13W8, Sapporo 060-8628, Japan
| | - Taku Matsushita
- Faculty of Engineering, Hokkaido University, N13W8, Sapporo 060-8628, Japan.
| | - Yoshihiko Matsui
- Faculty of Engineering, Hokkaido University, N13W8, Sapporo 060-8628, Japan
| | - Nobutaka Shirasaki
- Faculty of Engineering, Hokkaido University, N13W8, Sapporo 060-8628, Japan
| |
Collapse
|
771
|
Qiu HB, Guo PC, Yuan L, Sheng GP. Different non-radical oxidation processes of persulfate and peroxymonosulfate activation by nitrogen-doped mesoporous carbon. CHINESE CHEM LETT 2020. [DOI: 10.1016/j.cclet.2020.08.014] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
772
|
Bahadur N, Das P, Bhargava N. Improving energy efficiency and economic feasibility of photocatalytic treatment of synthetic and real textile wastewater using bagasse fly ash modified TiO2. CHEMICAL ENGINEERING JOURNAL ADVANCES 2020. [DOI: 10.1016/j.ceja.2020.100012] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
773
|
Wang J, Liu X, Li C, Yuan M, Zhang B, Zhu J, Ma Y. Fabrication of perylene imide-modified NH2-UiO-66 for enhanced visible-light photocatalytic degradation of tetracycline. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2020.112795] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
|
774
|
Si QS, Guo WQ, Wang HZ, Liu BH, Ren NQ. Carbon quantum dots-based semiconductor preparation methods, applications and mechanisms in environmental contamination. CHINESE CHEM LETT 2020. [DOI: 10.1016/j.cclet.2020.08.036] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
|
775
|
Liu Y, Liu F, Ding N, Hu X, Shen C, Li F, Huang M, Wang Z, Sand W, Wang CC. Recent advances on electroactive CNT-based membranes for environmental applications: The perfect match of electrochemistry and membrane separation. CHINESE CHEM LETT 2020. [DOI: 10.1016/j.cclet.2020.03.011] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
776
|
Meroni D, Jiménez-Salcedo M, Falletta E, Bresolin BM, Kait CF, Boffito DC, Bianchi CL, Pirola C. Sonophotocatalytic degradation of sodium diclofenac using low power ultrasound and micro sized TiO 2. ULTRASONICS SONOCHEMISTRY 2020; 67:105123. [PMID: 32283492 DOI: 10.1016/j.ultsonch.2020.105123] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 04/02/2020] [Accepted: 04/06/2020] [Indexed: 05/24/2023]
Abstract
The nonsteroidal anti-inflammatory drug sodium diclofenac (DC) is an emerging water pollutant which resists conventional wastewater treatments. Here the sonophotocatalytic degradation of DC was carried out using micrometric TiO2 (both pristine and Ag-decorated), UV-A irradiation and 20 kHz pulsed ultrasound. Sonophotocatalytic tests were compared with photolysis, sonolysis, sonophotolysis, sonocatalysis and photocatalysis data performed in the same conditions. A synergy index of over 2 was determined for tests with pristine TiO2, while values close to 1.3 were observed for Ag-TiO2. Reaction intermediates were studied by HPLC-MS, showing degradation mechanisms activated by hydroxyl radicals. Similar pathways were identified for photocatalytic and sonophotocatalytic tests, although the latter led to more oxidized compounds. Different reactor configurations (static and dynamic set ups) were studied. Sequential and simultaneous application of UV light and ultrasound led to similar performance. The role of water matrix was investigated using ultrapure and drinking water, showing marked detrimental effects of electrolytes on the DC degradation. Overall, the combined treatment proved more efficient than photocatalysis alone especially in demanding working conditions, like in drinking water matrices.
Collapse
Affiliation(s)
- Daniela Meroni
- Università degli Studi di Milano, Dipartimento di Chimica, via Golgi, 19 - 20133 Milano, Italy
| | - Marta Jiménez-Salcedo
- University of La Rioja, Centro de Investigación en Síntesis Química (CISQ), Department of Chemistry, C/ Madre de Dios 51, E-26006 Logroño La Rioja, Spain
| | - Ermelinda Falletta
- Università degli Studi di Milano, Dipartimento di Chimica, via Golgi, 19 - 20133 Milano, Italy
| | - Bianca M Bresolin
- Lappeenranta University of Technology, Laboratory of Green Chemistry, School of Engineering Science, Sammonkatu 12-50130, Mikkeli, Finland
| | - Chong Fai Kait
- Universiti Teknologi PETRONAS, Fundamental & Applied Sciences Department, 32610 Seri Iskandar, Malaysia
| | - Daria C Boffito
- Polytechnique Montréal - Génie Chimique 2900 Boul, Edouard Montpetit - H3T 1J4, Montréal, QC, Canada
| | - Claudia L Bianchi
- Università degli Studi di Milano, Dipartimento di Chimica, via Golgi, 19 - 20133 Milano, Italy
| | - Carlo Pirola
- Università degli Studi di Milano, Dipartimento di Chimica, via Golgi, 19 - 20133 Milano, Italy.
| |
Collapse
|
777
|
Rajwade K, Barrios AC, Garcia-Segura S, Perreault F. Pore wetting in membrane distillation treatment of municipal wastewater desalination brine and its mitigation by foam fractionation. CHEMOSPHERE 2020; 257:127214. [PMID: 32505039 DOI: 10.1016/j.chemosphere.2020.127214] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Revised: 05/22/2020] [Accepted: 05/23/2020] [Indexed: 06/11/2023]
Abstract
Reverse Osmosis (RO) desalination is an important step of wastewater reuse as it can remove salts and trace contaminants. However, RO also generates high salinity brines that need to be dealt with. Membrane distillation (MD), a process largely unaffected by salinity, provides a way to treat desalination brines up to high water recovery and has been proposed as a solution for RO brine management. However, pore wetting of membranes in MD is one of the major hurdles that prevents its implementation in wastewater treatment systems, as amphiphilic organic compounds present in wastewater can lead to pore wetting and loss of selectivity over time. The objective of this study was to identify a pre-treatment strategy to prevent wetting in MD treatment of municipal wastewater RO brines. We compared three pre-treatments with different separation or removal mechanisms: foam fractionation, advanced oxidation, and ultrafiltration. We evaluated membrane wetting by measuring the change in conductivity in the distillate and identified the most effective pre-treatment to prevent wetting in MD. The results show that wetting is prevented by pre-treating the brine with foam fractionation. The effectiveness of foam fractionation as a wetting control strategy was confirmed for a high wetting propensity synthetic water using sodium dodecyl sulfate as a model wetting compound. Finally, the effect of the pre-treatments on the desalination brine was evaluated to understand the nature of the compounds removed by each treatment. The results of this study will help implement MD as a treatment process for desalination brines in municipal wastewater reuse systems.
Collapse
Affiliation(s)
- Kimya Rajwade
- School of Sustainable Engineering and the Built Environment, Arizona State University, United States; Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, Arizona State University, Tempe, AZ, United States
| | - Ana C Barrios
- School of Sustainable Engineering and the Built Environment, Arizona State University, United States; Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, Arizona State University, Tempe, AZ, United States
| | - Sergi Garcia-Segura
- School of Sustainable Engineering and the Built Environment, Arizona State University, United States; Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, Arizona State University, Tempe, AZ, United States
| | - François Perreault
- School of Sustainable Engineering and the Built Environment, Arizona State University, United States; Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, Arizona State University, Tempe, AZ, United States.
| |
Collapse
|
778
|
de Souza EJ, Neves NSDCS, Gomes RKDM, Santos Júnior SGD, Charamba LVC, Campos NF, Napoleão DC. Treatment of textile dyes using advanced oxidative and adsorptive processes individually and combined: study of the operational parameters, kinetic and adsorptive equilibrium. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2020; 82:1327-1338. [PMID: 33079713 DOI: 10.2166/wst.2020.415] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Advanced oxidative processes (AOP) have been consolidated as an efficient treatment technique to degrade persistent contaminants. In addition to them, biosorption also emerges as a technique capable of removing both pollutants and intermediate products generated by other treatments such as AOP. Thus, this work evaluated the degradation and removal of the mixture of dyes Direct Red 23 and Direct Red 227 in aqueous solution (50 mg·L-1 of each). Preliminary tests showed that the photo-Fenton system under sunlight radiation was the most efficient, reaching a degradation ≥93%. For the adsorptive process using chicken eggshell, preliminary tests indicated that the ideal dosage of adsorbent was 8.0 g·L-1. For this process, a factorial design indicated the best working conditions, which demonstrated from the system adjusted well to the Elovich (kinetic) model and to the Freundlich and Sips models (equilibrium). When associating the two processes, AOP followed by adsorption achieved a total degradation/removal of ≈98% (for all λ) in a time of 60 min. Thus, the feasibility of the combined treatment is indicated.
Collapse
Affiliation(s)
- Emanuely José de Souza
- Chemical Engineering Department, Universidade Federal de Pernambuco, 1235 Professor Moraes do Rego Avenue, PC: 50740-52, Cidade Universitária, Recife, Brazil E-mail:
| | - Naiana Santos da Cruz Santana Neves
- Chemical Engineering Department, Universidade Federal de Pernambuco, 1235 Professor Moraes do Rego Avenue, PC: 50740-52, Cidade Universitária, Recife, Brazil E-mail:
| | - Rayssa Kelen de Mendonça Gomes
- Chemical Engineering Department, Universidade Federal de Pernambuco, 1235 Professor Moraes do Rego Avenue, PC: 50740-52, Cidade Universitária, Recife, Brazil E-mail:
| | - Sérgio Gonzaga Dos Santos Júnior
- Chemical Engineering Department, Universidade Federal de Pernambuco, 1235 Professor Moraes do Rego Avenue, PC: 50740-52, Cidade Universitária, Recife, Brazil E-mail:
| | | | - Natália Ferreira Campos
- Chemical Engineering Department, Universidade Federal de Pernambuco, 1235 Professor Moraes do Rego Avenue, PC: 50740-52, Cidade Universitária, Recife, Brazil E-mail:
| | - Daniella Carla Napoleão
- Chemical Engineering Department, Universidade Federal de Pernambuco, 1235 Professor Moraes do Rego Avenue, PC: 50740-52, Cidade Universitária, Recife, Brazil E-mail:
| |
Collapse
|
779
|
Yang Y, Li X, Zhou C, Xiong W, Zeng G, Huang D, Zhang C, Wang W, Song B, Tang X, Li X, Guo H. Recent advances in application of graphitic carbon nitride-based catalysts for degrading organic contaminants in water through advanced oxidation processes beyond photocatalysis: A critical review. WATER RESEARCH 2020; 184:116200. [PMID: 32712506 DOI: 10.1016/j.watres.2020.116200] [Citation(s) in RCA: 160] [Impact Index Per Article: 40.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Revised: 07/16/2020] [Accepted: 07/17/2020] [Indexed: 06/11/2023]
Abstract
Advanced oxidation processes (AOPs) have attracted much interest in the field of water treatment owing to their high removal efficiency for refractory organic contaminants. Graphitic carbon nitride (g-C3N4)-based catalysts with high performance and cost effectiveness are promising heterogeneous catalysts for AOPs. Most research on g-C3N4-based catalysts focuses on photocatalytic oxidation, but increasingly researchers are paying attention to the application of g-C3N4-based catalysts in other AOPs beyond photocatalysis. This review aims to concisely highlight recent state-of-the-art progress of g-C3N4-based catalysts in AOPs beyond photocatalysis. Emphasis is made on the application of g-C3N4-based catalysts in three classical AOPs including Fenton-based processes, catalytic ozonation and persulfates activation. The catalytic performance and involved mechanism of g-C3N4-based catalysts in these AOPs are discussed in detail. Meanwhile, the effect of water chemistry including pH, water temperature, natural organic matter, inorganic anions and dissolved oxygen on the catalytic performance of g-C3N4-based catalysts are summarized. Moreover, the reusability, stability and toxicity of g-C3N4-based catalysts in water treatment are also mentioned. Lastly, perspectives on the major challenges and opportunities of g-C3N4-based catalysts in these AOPs are proposed for better developments in the future research.
Collapse
Affiliation(s)
- Yang Yang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China
| | - Xin Li
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China
| | - Chengyun Zhou
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China
| | - Weiping Xiong
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China
| | - Guangming Zeng
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China.
| | - Danlian Huang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China.
| | - Chen Zhang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China.
| | - Wenjun Wang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China
| | - Biao Song
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China
| | - Xiang Tang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China
| | - Xiaopei Li
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China
| | - Hai Guo
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China
| |
Collapse
|
780
|
Belghit A, Merouani S, Hamdaoui O, Alghyamah A, Bouhelassa M. Influence of processing conditions on the synergism between UV irradiation and chlorine toward the degradation of refractory organic pollutants in UV/chlorine advanced oxidation system. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 736:139623. [PMID: 32502785 DOI: 10.1016/j.scitotenv.2020.139623] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 05/14/2020] [Accepted: 05/20/2020] [Indexed: 06/11/2023]
Abstract
The synergy of applying UV/chlorine advanced oxidation process (AOP) for the degradation of organic pollutants was usually reported. However, very limited information is available on the influence of processing conditions on the resulted synergism. In this work, C.I. reactive green 12 (RG12), a refractory textile dye, has been selected as a pollutant model to examine the synergism dependence of operational conditions in UV/chlorine AOP. Initial tests conducted with 500 μM of chlorine and 20 mg L-1 of RG12 have resulted in a high synergy index (SI) of 3. Operating conditions sensitively affect the value of SI. This latter increased with increasing initial chlorine and RG12 concentrations up to certain optimums at 500 μM of chlorine and 20 mg L-1 of RG12 and decreased afterward. The best SI value, i.e. 3, was obtained at pH 5, followed by pH 7 (SI = 2.2) and then pH 9-10.5 (SI ~ 2). On the other hand, the synergistic index decreased importantly from 3 at 25 °C to only 1.2 at 55 °C. Finally, by using different radical scavengers, it was found that among various suspected oxidants, only ●OH and Cl2●- play a key role in the synergistic effect between UV and chlorine toward RG12 degradation.
Collapse
Affiliation(s)
- Aouattef Belghit
- Laboratory of Environmental Process Engineering, Department of Chemical Engineering, Faculty of Process Engineering, University Salah Boubnider Constantine 3, P.O. Box 72, 25000 Constantine, Algeria
| | - Slimane Merouani
- Laboratory of Environmental Process Engineering, Department of Chemical Engineering, Faculty of Process Engineering, University Salah Boubnider Constantine 3, P.O. Box 72, 25000 Constantine, Algeria.
| | - Oualid Hamdaoui
- Chemical Engineering Department, College of Engineering, King Saud University, P.O. Box 800, 11421 Riyadh, Saudi Arabia
| | - Abdulaziz Alghyamah
- Chemical Engineering Department, College of Engineering, King Saud University, P.O. Box 800, 11421 Riyadh, Saudi Arabia
| | - Mohammed Bouhelassa
- Laboratory of Environmental Process Engineering, Department of Chemical Engineering, Faculty of Process Engineering, University Salah Boubnider Constantine 3, P.O. Box 72, 25000 Constantine, Algeria
| |
Collapse
|
781
|
Zhang Y, Wang H, Li Y, Wang B, Huang J, Deng S, Yu G, Wang Y. Removal of micropollutants by an electrochemically driven UV/chlorine process for decentralized water treatment. WATER RESEARCH 2020; 183:116115. [PMID: 32652347 DOI: 10.1016/j.watres.2020.116115] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 06/22/2020] [Accepted: 06/25/2020] [Indexed: 06/11/2023]
Abstract
The ultraviolet/chlorine (UV/Cl2) process is an emerging advanced oxidation technology for micropollutant abatement in water and wastewater treatment. However, the application of the conventional UV/Cl2 process in decentralized systems is limited by the transport and management of liquid chlorine. To overcome this limitation, this study evaluated an electrochemically driven UV/Cl2 (E-UV/Cl2) process for micropollutant abatement under conditions simulating decentralized water treatment. The E-UV/Cl2 process combines UV irradiation with in situ electrochemical Cl2 production from anodic oxidation of chloride (Cl-) in source waters. The results show that with typical Cl- concentrations present in water sources for decentralized systems (30-300 mg/L Cl-), sufficient amounts of chlorine could be quickly electrochemically produced at the anode to enable E-UV/Cl2 process for water treatment. Due to its multiple mechanisms for micropollutant abatement (direct photolysis, direct electrolysis, Cl2-mediated oxidation, as well as hydroxyl radical and reactive chlorine species oxidation), the E-UV/Cl2 process effectively eliminated all micropollutants (trimethoprim, ciprofloxacin, metoprolol, and carbamazepine) spiked in a surface water in 5 min. In contrast, at least one micropollutant with ∼20-80% residual concentrations could still be detected in the water treated by 10 min of UV irradiation, chlorination, electrolysis, and the conventional UV/Cl2 process under similar experimental conditions. The electrical energy per order (EEO) for micropollutant abatement ranged from 0.15 to 1.8 kWh/m3 for the E-UV/Cl2 process, which is generally comparable to that for the conventional UV/Cl2 process (0.14-2.7 kWh/m3). These results suggest that by in-situ generating Cl2 from anodic oxidation of Cl-, the E-UV/Cl2 process can overcome the barrier of the conventional UV/Cl2 process and thus provide a promising technology for micropollutant abatement in decentralized water treatment systems.
Collapse
Affiliation(s)
- Yinqiao Zhang
- School of Environment, Beijing Key Laboratory for Emerging Organic Contaminants Control, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China
| | - Huijiao Wang
- School of Environment, Beijing Key Laboratory for Emerging Organic Contaminants Control, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China
| | - Yang Li
- School of Environment, Beijing Key Laboratory for Emerging Organic Contaminants Control, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China
| | - Bin Wang
- School of Environment, Beijing Key Laboratory for Emerging Organic Contaminants Control, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China
| | - Jun Huang
- School of Environment, Beijing Key Laboratory for Emerging Organic Contaminants Control, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China
| | - Shubo Deng
- School of Environment, Beijing Key Laboratory for Emerging Organic Contaminants Control, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China
| | - Gang Yu
- School of Environment, Beijing Key Laboratory for Emerging Organic Contaminants Control, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China
| | - Yujue Wang
- School of Environment, Beijing Key Laboratory for Emerging Organic Contaminants Control, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China.
| |
Collapse
|
782
|
Kiefer K, Bader T, Minas N, Salhi E, Janssen EML, von Gunten U, Hollender J. Chlorothalonil transformation products in drinking water resources: Widespread and challenging to abate. WATER RESEARCH 2020; 183:116066. [PMID: 32652346 DOI: 10.1016/j.watres.2020.116066] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 05/25/2020] [Accepted: 06/14/2020] [Indexed: 06/11/2023]
Abstract
Chlorothalonil, a fungicide applied for decades worldwide, has recently been banned in the European Union (EU) and Switzerland due to its carcinogenicity and the presence of potentially toxic transformation products (TPs) in groundwater. The spread and concentration range of chlorothalonil TPs in different drinking water resources was examined (73 groundwater and four surface water samples mainly from Switzerland). The chlorothalonil sulfonic acid TPs (R471811, R419492, R417888) occurred more frequently and at higher concentrations (detected in 65-100% of the samples, ≤2200 ngL-1) than the phenolic TPs (SYN507900, SYN548580, R611968; detected in 10-30% of the samples, ≤130 ngL-1). The TP R471811 was found in all samples and even in 52% of the samples above 100 ngL-1, the drinking water standard in Switzerland and other European countries. Therefore, the abatement of chlorothalonil TPs was investigated in laboratory and pilot-scale experiments and along the treatment train of various water works, comprising aquifer recharge, UV disinfection, ozonation, advanced oxidation processes (AOPs), activated carbon treatment, and reverse osmosis. The phenolic TPs can be abated during ozonation (second order rate constant kO3 ∼104 M-1s-1) and by reaction with hydroxyl radicals (OH) in AOPs (kOH ∼109 M-1s-1). In contrast, the sulfonic acid TPs, which occurred in higher concentrations in drinking water resources, react only very slowly with ozone (kO3 <0.04 M-1s-1) and OH (kOH <5.0 × 107 M-1s-1) and therefore persist in ozonation and OH-based AOPs. Activated carbon retained the very polar TP R471811 only up to a specific throughput of 25 m3kg-1 (20% breakthrough), similarly to the X-ray contrast agent diatrizoic acid. Reverse osmosis was capable of removing all chlorothalonil TPs by ≥98%.
Collapse
Affiliation(s)
- Karin Kiefer
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600, Dübendorf, Switzerland; Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, 8092, Zurich, Switzerland
| | - Tobias Bader
- Laboratory for Operation Control and Research, Zweckverband Landeswasserversorgung, 89129, Langenau, Germany
| | - Nora Minas
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600, Dübendorf, Switzerland
| | - Elisabeth Salhi
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600, Dübendorf, Switzerland
| | - Elisabeth M-L Janssen
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600, Dübendorf, Switzerland
| | - Urs von Gunten
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600, Dübendorf, Switzerland; Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, 8092, Zurich, Switzerland; School of Architecture, Civil and Environmental Engineering (ENAC), École Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland
| | - Juliane Hollender
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600, Dübendorf, Switzerland; Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, 8092, Zurich, Switzerland.
| |
Collapse
|
783
|
Development of Sustainable Heterogeneous Catalysts for the Photocatalytic Treatment of Effluents. SUSTAINABILITY 2020. [DOI: 10.3390/su12187393] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The inadequate discharge of effluents from different sources without prior treatment can impact the characteristics of soil and water, which reflect serious environmental problems. Advanced oxidative processes (AOP) appear as a viable alternative for environmental remediation, including wastewater treatment. Herein, α-MoO3 and α-Fe2O3 semiconductors were synthesized at low temperature by a Pechini-based method and then applied in photocatalysis. The catalytic efficiency was performed under visible light toward the degradation of an organic persistent pollutant (Rhodamine B dye, RhB), commonly present in industries wastewater. The results indicated that the synthesized α-MoO3 or α-Fe2O3 photocatalysts presented a pronounced activity and promoted an efficient RhB degradation after 15 min of reaction. α-MoO3 had a degradation efficiency of 93% and 98%, while α-Fe2O3 showed 67% and 100% RhB degradation without and with the addition of H2O2, respectively. These results suggest that the synthesized oxides have high oxi-reductive capacity, which can be used for a fast and effective photodegradation of RhB and other organic persistent pollutants to minimize environmental impacts.
Collapse
|
784
|
Du Y, Wang WL, Zhang DY, Zhou TH, Lee MY, Wu QY, Hu HY, He ZM, Huang TY. Degradation of non-oxidizing biocide benzalkonium chloride and bulk dissolved organic matter in reverse osmosis concentrate by UV/chlorine oxidation. JOURNAL OF HAZARDOUS MATERIALS 2020; 396:122669. [PMID: 32361623 DOI: 10.1016/j.jhazmat.2020.122669] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Revised: 03/13/2020] [Accepted: 04/05/2020] [Indexed: 06/11/2023]
Abstract
Non-oxidizing biocide that is used to inhibit the microorganism growth on RO membrane, are observed to be high concentration and toxic in RO concentrate. The synergistic oxidation process (SOP) of UV/chlorine was investigated to simultaneously reduced the content (60.2 %) and toxicity (57.0 %) of a representative biocide dodecylbenzyldimethylammonium chloride (DDBAC) in real RO concentrate, with a UV fluence 1080 mJ/cm2 and chlorine dose 20 mg/L. Besides eliminating the DDBAC, UV/chlorine reduced the UVA254 and fluorescence of the dissolved organic matters (DOM). The oxidation mechanism was verified to be the radical electrophilic addition rather than the chlorine-electrophilic substitution through the decay of electron-donation moiety and UVA254. As results, high molecular weight fractions of DOM (>2k Da, 79.2 %) was cleaved into low molecular weight fractions (<0.4k Da, 18.4 %) and organic halide was formed. Parallel-factor analysis of the fluorescence components suggested that decomposition of the protein-like fluorophore is most likely to surrogate the biocide removal and organic halide formation compared to other fluorophore components and UVA254. Accordingly, a portable fluorescence probe with 400 nm excitation and 410-600 nm emission wavelengths was developed as an online surrogate for the DDBAC removal and organic halide formation.
Collapse
Affiliation(s)
- Ye Du
- Key Laboratory of Microorganism Application and Risk Control of Shenzhen, Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety, Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China; Shenzhen Environmental Science and New Energy Technology Engineering Laboratory, Tsinghua-Berkeley Shenzhen Institute, Shenzhen 518055, China
| | - Wen-Long Wang
- Shenzhen Environmental Science and New Energy Technology Engineering Laboratory, Tsinghua-Berkeley Shenzhen Institute, Shenzhen 518055, China; Environmental Simulation and Pollution Control State Key Joint Laboratory, State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (SMARC), and School of Environment, Tsinghua University, Beijing 100084, China
| | - Da-Yin Zhang
- Key Laboratory of Microorganism Application and Risk Control of Shenzhen, Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety, Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Tian-Hui Zhou
- Key Laboratory of Microorganism Application and Risk Control of Shenzhen, Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety, Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Min-Yong Lee
- Environmental Simulation and Pollution Control State Key Joint Laboratory, State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (SMARC), and School of Environment, Tsinghua University, Beijing 100084, China
| | - Qian-Yuan Wu
- Key Laboratory of Microorganism Application and Risk Control of Shenzhen, Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety, Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China.
| | - Hong-Ying Hu
- Shenzhen Environmental Science and New Energy Technology Engineering Laboratory, Tsinghua-Berkeley Shenzhen Institute, Shenzhen 518055, China; Environmental Simulation and Pollution Control State Key Joint Laboratory, State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (SMARC), and School of Environment, Tsinghua University, Beijing 100084, China
| | - Zhi-Ming He
- Foshan Comwin Light & Electricity Co., Ltd., Gaomin District, Foshan, Guangdong, China
| | - Tian-Yin Huang
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| |
Collapse
|
785
|
Park JM, Jhung SH. Polyaniline-derived carbons: Remarkable adsorbents to remove atrazine and diuron herbicides from water. JOURNAL OF HAZARDOUS MATERIALS 2020; 396:122624. [PMID: 32344360 DOI: 10.1016/j.jhazmat.2020.122624] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 03/10/2020] [Accepted: 03/30/2020] [Indexed: 06/11/2023]
Abstract
The contamination of water resources by hazardous organic compounds is becoming severe worldwide. In this study, the adsorptive removal of atrazine (ATZ) and diuron (DUR), two widely used herbicides, from water by polyaniline-derived carbons (PDCs) was investigated for the first time, under various conditions. A selected PDC, fabricated at optimum conditions, i.e., by pyrolysis at 800 °C (and labeled PDC(800)), showed remarkable adsorptivity for both herbicides, that is, 7.7 and 11.3 times the maximum adsorption capacity (Q0) for ATZ and DUR, respectively, compared to activated carbon (AC). Or, the Q0 values of PDC(800) for ATZ and DUR were 943 and 884 mg/g, respectively; however, the Q0 values of AC were only 123 and 78.0 mg/g, respectively. Moreover, the optimum adsorbent PDC(800) had 4.5 and 3.1 times Q0 that of the best adsorbent, that showed the highest performances, so far, for ATZ and DUR, respectively. Plausible adsorption mechanisms were suggested based on the porosity and the adsorption in a wide pH range. The new adsorbent was reusable via simple solvent washing. Based on its remarkable adsorption performance and facile reusability, PDC(800) can be considered a promising adsorbent to remove herbicides such as ATZ and DUR from contaminated water.
Collapse
Affiliation(s)
- Jong Min Park
- Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Sung Hwa Jhung
- Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu 41566, Republic of Korea.
| |
Collapse
|
786
|
Luo X, Hu H, Pan Z, Pei F, Qian H, Miao K, Guo S, Wang W, Feng G. Efficient and stable catalysis of hollow Cu 9S 5 nanospheres in the Fenton-like degradation of organic dyes. JOURNAL OF HAZARDOUS MATERIALS 2020; 396:122735. [PMID: 32339878 DOI: 10.1016/j.jhazmat.2020.122735] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 03/18/2020] [Accepted: 04/13/2020] [Indexed: 06/11/2023]
Abstract
The development of new heterogeneous catalysts with stable catalytic activity in a wide pH range to prevent polluting precipitation plays a vital role in large-scale wastewater treatment. Here, a facile anion exchange strategy was designed to fabricate hollow Cu9S5 nanospheres by using Cu2O nanospheres as hard-templates. The structural and compositional transformation from Cu2O nanospheres to hollow Cu9S5 nanospheres were investigated via X-ray diffraction, scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. The Fenton-like degradation of organic dyes was used to evaluate the catalytic performance of the obtained Cu-containing catalysts. Results reveal that the hollow Cu9S5 nanospheres have the best catalytic activity among five kinds of Cu-containing catalysts. Hollow Cu9S5 nanospheres can effectively accelerate the decomposition of H2O2 into hydroxyl radicals and superoxide radical, which have been proven to be mainly oxidative species in the Fenton-like degradation of organic pollutants. Hollow Cu9S5 nanospheres have a wide pH application range of 5.0-9.0, and their extremely stable activity can be maintained in at least 15 catalytic cycles with a Cu2+ ion leaching rate of less than 1.0 %. The outstanding catalytic performance of the Cu9S5 catalyst is expected to enhance the practical applications of copper sulfide catalysts in Fenton-like wastewater treatment.
Collapse
Affiliation(s)
- Xiaolin Luo
- Key Laboratory of Advanced Molecular Engineering Materials, College of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721013, PR China.
| | - Huanting Hu
- Key Laboratory of Advanced Molecular Engineering Materials, College of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721013, PR China
| | - Zhe Pan
- Key Laboratory of Advanced Molecular Engineering Materials, College of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721013, PR China
| | - Fei Pei
- Key Laboratory of Advanced Molecular Engineering Materials, College of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721013, PR China
| | - Huaming Qian
- Key Laboratory of Advanced Molecular Engineering Materials, College of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721013, PR China
| | - Kangkang Miao
- Key Laboratory of Advanced Molecular Engineering Materials, College of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721013, PR China
| | - Sifan Guo
- Key Laboratory of Advanced Molecular Engineering Materials, College of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721013, PR China
| | - Wei Wang
- Key Laboratory of Advanced Molecular Engineering Materials, College of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721013, PR China
| | - Guodong Feng
- Key Laboratory of Advanced Molecular Engineering Materials, College of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721013, PR China; State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, PR China; Department of Chemistry, University of Tennessee Knoxville, TN 37996, USA.
| |
Collapse
|
787
|
Kinetics and mechanisms of chloramphenicol degradation in aqueous solutions using heat-assisted nZVI activation of persulfate. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113511] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
|
788
|
Pan Z, Yu F, Li L, Liu M, Song C, Yang J, Li H, Wang C, Pan Y, Wang T. Electrochemical filtration carbon membrane derived from coal for wastewater treatment: Insights into the evolution of electrical conductivity and electrochemical performance during carbonization. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.116948] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
789
|
Hasani M, Wu F, Warriner K. Validation of a vapor-phase advanced oxidation process for inactivating Listeria monocytogenes, its surrogate Lactobacillus fructivorans, and spoilage molds associated with green or red table grapes. J Food Sci 2020; 85:2645-2655. [PMID: 32839995 DOI: 10.1111/1750-3841.15387] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 06/26/2020] [Accepted: 06/30/2020] [Indexed: 11/30/2022]
Abstract
A method based on vapor-phase advanced oxidation process (AOP) for decontaminating red or green grapes was validated for inactivating Listeria monocytogenes and spoilage molds. A Central Composite Design (CCD) and Response Surface Methodology (RSM) were applied to determine the contribution of UV-C (254 nm) dose, hydrogen peroxide, and ozone concentration on the lethality toward Aspergillus niger spores (biodensiometer) and changes to the grape quality (firmness and color over 14-day post-treatment storage at 4 °C). A high UV-C dose (>129 mJ/cm2 ) or >4.0 % v/v hydrogen peroxide induced-blistering and darkening of grapes at the end of the storage period. Yet, an optimized AOP treatment (with regards to preserving grape quality) was derived to be 1.3% v/v hydrogen peroxide (5 mL/10 berries) with 9-mg ozone gas and a UV-C dose of 123 mJ/cm2 (10 s at UV-C intensity of 12 mW/cm2 ). A predictive model was constructed and verified based on the log reduction of A. niger spores and changes in quality characteristics of red grapes. The optimal AOP treatment supported a 1.6-log CFU/g reduction of Aspergillus spores and decreased L. monocytogenes counts by 3.92 ± 0.17 and 4.77 ± 0.30 log CFU/g on green and red grapes, respectively, that were not significantly different to the surrogate, Lactobacillus fructivorans. There was no significant difference in the reduction of L. monocytogenes with grapes arranged in a single or double layer. Botrytis cinerea counts were reduced by 1.08 to 1.35 log CFU/g using the optimized AOP treatment with no change in grape color or firmness during storage. A sensory panel could not differentiate AOP-treated grapes from nontreated controls although 3 of 15 panelists did note subtle flavor notes. PRACTICAL APPLICATION: Postharvest washing of fresh produce has limited efficacy in removing foodborne pathogens and spoilage microbes. This is especially relevant to berries, such as grapes, that are susceptible to spoilage following washing. The vapor-phase AOP treatment provides a supplemental or alternative approach for produce decontamination. However, the operating parameters need to be optimized to ensure that decontamination of grapes is not at the expense of quality. In the current study, this was achieved by ensuring a balance between hydrogen peroxide, ozone, and UV-C dose that form the elements of an AOP treatment.
Collapse
Affiliation(s)
- Mahdiyeh Hasani
- Department of Food Science, University of Guelph, Guelph, Ontario, Canada
| | - Fan Wu
- Department of Food Science, University of Guelph, Guelph, Ontario, Canada
| | - Keith Warriner
- Department of Food Science, University of Guelph, Guelph, Ontario, Canada
| |
Collapse
|
790
|
Seo YD, Oh SY, Rajagopal R, Ryu KS. FeS-biochar and Zn(0)-biochar for remediation of redox-reactive contaminants. RSC Adv 2020; 10:30203-30213. [PMID: 35518218 PMCID: PMC9056297 DOI: 10.1039/d0ra05571a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Accepted: 08/06/2020] [Indexed: 01/26/2023] Open
Abstract
To enhance the removal of redox-reactive contaminants, biochars including FeS and Zn(0) were developed via pyrolysis. These biochars significantly promoted the removal of 2,4-dichlorophenol (DCP) by means of sorption and reduction. Compared to direct reduction with FeS and Zn(0), the formation of reduction intermediates and product was enhanced from 21% and 22% of initial DCP concentration to 41% and 52%, respectively. 2,4-Dinitrotoluene (DNT), chromate (CrO42−) and selenate (SeO42−) were also reductively transformed to reduction products (e.g., 2,4-diaminotoluene [DAT], Cr3+, and selenite [SeO32−]) after they sorbed onto the biochars including FeS and Zn(0). Mass recovery as DAT, Cr3+ and selenite was 4–20%, 1–3%, and 10–30% under the given conditions. Electrochemical and X-ray analyses confirmed the reduction capability of the biochars including FeS and Zn(0). Fe and S in the FeS–biochar did not effectively promote the reductive transformation of the contaminants. Contrastingly, the stronger reducer Zn(0) yielded faster reductive transformation of contaminants over the Zn(0)-containing biochar, while not releasing high concentrations of Zn2+ into the aqueous phase. Our results suggest that biochars including Zn(0) may be suitable as dual sorbents/reductants to remediate redox-reactive contaminants in natural environments. To enhance the removal of redox-reactive contaminants, biochars including FeS and Zn(0) were developed via pyrolysis.![]()
Collapse
Affiliation(s)
- Yong-Deuk Seo
- Department of Civil and Environmental Engineering, University of Ulsan 93 Daehak-ro, Nam-gu Ulsan 44610 South Korea +82-52-259-2629 +82-52-259-2752
| | - Seok-Young Oh
- Department of Civil and Environmental Engineering, University of Ulsan 93 Daehak-ro, Nam-gu Ulsan 44610 South Korea +82-52-259-2629 +82-52-259-2752
| | - Rajesh Rajagopal
- Department of Chemistry, University of Ulsan Ulsan 44610 South Korea
| | - Kwang-Sun Ryu
- Department of Chemistry, University of Ulsan Ulsan 44610 South Korea
| |
Collapse
|
791
|
Enhanced Visible Light Active WO 3 Thin Films Toward Air Purification: Effect of the Synthesis Conditions. MATERIALS 2020; 13:ma13163506. [PMID: 32784513 PMCID: PMC7475911 DOI: 10.3390/ma13163506] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 08/04/2020] [Accepted: 08/06/2020] [Indexed: 11/17/2022]
Abstract
Taking our current environmental situation in the world into consideration, people should face growing problems of air and water pollution. Heterogeneous photocatalysis is a highly promising tool to improve both air and water quality through decomposition/mineralization of contaminants directly into harmless CO2 and H2O under ambient conditions. In this contribution, we focused on the synthesis of self-assembly WO3 thin films via an electrochemical approach in the aqueous electrolyte containing fluoride ions toward air purification. The effect of preparation conditions such as applied potential (10–50 V), anodization time (15–120 min), concentration of H2SO4 (0.5–1.5 M) and NaF (0.1–1.0 wt.%) on the morphology, photocurrent response, and photocatalytic activity addressed to removal of air pollutant in the presence of as-prepared WO3 samples were thoroughly examined and presented. The results revealed the growth of nanoplatelets and their gradual transformation into flower-like structures. The oxide layers and platelet thickness of the WO3 samples were found to be proportionally related with the synthesis conditions. The photocatalytic ability toward air purification was evaluated by degradation of toluene from air mixture using low-powered LEDs as an irradiation source (λmax = 415 nm). The highest photoactivity was achieved in presence of the sample which possessed a well-ordered, regular shape and repeatable distribution of flower buds (100% of degradation). The results have confirmed that the oxide layer thickness of the anodic WO3 significantly affected the photocatalytic activity, which increased with the increasing thickness of WO3 (to 1.05 μm) and then had a downward trend. The photocurrent response evidenced that the well-organized sample had the highest ability in photocurrent generation under UV-Vis and Vis irradiation. Finally, a possible growth mechanism of WO3 NFs was also discussed.
Collapse
|
792
|
Wu W, Xu C, Shi X, Zhao J, An X, Ma H, Tian Y, Zhou H. Effective degradation of organic pollutants and reaction mechanism with flower-like AgBiO3/g-C3N4 composite. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.124901] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
793
|
Huang Y, Liu H, Liu S, Li C, Yuan S. Glucose oxidase modified Fenton reactions for in-situ ROS generation and potential application in groundwater remediation. CHEMOSPHERE 2020; 253:126648. [PMID: 32298911 DOI: 10.1016/j.chemosphere.2020.126648] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 03/26/2020] [Accepted: 03/29/2020] [Indexed: 06/11/2023]
Abstract
Catalyzed H2O2 propagations (CHP) have demonstrated great potential in the remediation of chlorinated aliphatic hydrocarbons (CAHs) like trichloroethene (TCE) contaminated groundwater. However, the importation of highly unstable H2O2 into subsurface environment remains challenging. In this work, the in-situ H2O2 generation reaction between glucose oxidase (GOD) and glucose was applied in combination with Fe(II) to form the modified Fenton system (GMFs) and its performance in TCE oxidative degradation was investigated. The influence of reactant concentration as well as environmental factors like temperature and pH on the kinetics of TCE oxidation in GMFs were studied. At optimized conditions, about 78% TCE were removed within 8 h in GMFs, which remained effective over the temperature range of 15-30 °C and pH range of 3.6-6.0 (in acetate buffer). The in-situ H2O2 and OH generation capacity of GMFs were further investigated to elucidate their functional mechanism on TCE oxidation. Intermediate and product analysis indicated the near-complete release of chloride ion by TCE oxidation with few organic chlorinated intermediates detected. This work reveals the potential of GMFs for CAHs contaminated groundwater remediation through in-situ generation of reactive oxygen species.
Collapse
Affiliation(s)
- Yao Huang
- School of Environmental Studies, China University of Geosciences, 388 Lumo Road, Wuhan, 430074, China
| | - Hui Liu
- School of Environmental Studies, China University of Geosciences, 388 Lumo Road, Wuhan, 430074, China; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, China.
| | - Shan Liu
- School of Environmental Studies, China University of Geosciences, 388 Lumo Road, Wuhan, 430074, China
| | - Cui Li
- School of Environmental Studies, China University of Geosciences, 388 Lumo Road, Wuhan, 430074, China
| | - Songhu Yuan
- State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, China
| |
Collapse
|
794
|
Mei Y, Qi Y, Li J, Deng X, Ma S, Yao T, Wu J. Construction of yolk/shell Fe3O4@MgSiO3 nanoreactor for enhanced Fenton-like reaction via spatial separation of adsorption sites and activation sites. J Taiwan Inst Chem Eng 2020. [DOI: 10.1016/j.jtice.2020.08.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
|
795
|
|
796
|
Ji Q, Xu Z, Xiang W, Wu Y, Cheng X, Xu C, Qi C, He H, Hu J, Yang S, Li S, Zhang L. Enhancing the performance of pollution degradation through secondary self-assembled composite supramolecular heterojunction photocatalyst BiOCl/PDI under visible light irradiation. CHEMOSPHERE 2020; 253:126751. [PMID: 32302913 DOI: 10.1016/j.chemosphere.2020.126751] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Revised: 03/23/2020] [Accepted: 04/07/2020] [Indexed: 06/11/2023]
Abstract
A novel n-n type inorganic/organic heterojunction of flaky-like BiOCl/PDI photocatalyst was constructed by water bath heating method. Meanwhile, a simple method - secondary self-assembly was used to prepare the BiOCl/PDI with a special band structure. The photocatalytic activities were evaluated by degrading aqueous organic pollutants under visible light (λ > 420 nm). The removal rates of 5 mg L-1 phenol (non-ionic type), methyl orange (MO, anionic type), rhodamine B (RhB, cationic type) and 10 mg L-1 RhB by secondary self-assembly BiOCl/PDI (BiOCl/PDI-2) were 8.0%, 3.4%, 27.8% and 78.9% higher than self-assembly BiOCl/PDI (BiOCl/PDI-1) under visible light (λ > 420 nm). The better photocatalytic activity for BiOCl/PDI-2 was attributed to the optimization of energy-band structures, which arose from different exposed surfaces, narrower interplanar spacing and stronger visible light absorption performance. Under acidic condition, BiOCl/PDI-2 showed a good photocatalytic activity, which was not affected by neutral ionic intensity and had good recycling properties. Moreover, the photocatalytic mechanism was explored by free radical capture test and electron paramagnetic resonance (EPR), and contribution of active species was calculated. The main active species of BiOCl/PDI-2 were ·O2-, 1O2 and h+. Our work may provide a route to design efficient inorganic/organic heterojunctions for organic pollutants degradation.
Collapse
Affiliation(s)
- Qiuyi Ji
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, PR China
| | - Zhe Xu
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, PR China
| | - Weiming Xiang
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, PR China
| | - Yijie Wu
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, PR China
| | - Xinying Cheng
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, PR China
| | - Chenmin Xu
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, PR China
| | - Chengdu Qi
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, PR China
| | - Huan He
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, PR China; College of Ecological and Resource Engineering, Fujian Provincial Key Laboratory of Eco-Industrial Green Technology, Wuyi University, Wuyishan, Fujian 354300, PR China.
| | - Jiapeng Hu
- College of Ecological and Resource Engineering, Fujian Provincial Key Laboratory of Eco-Industrial Green Technology, Wuyi University, Wuyishan, Fujian 354300, PR China
| | - Shaogui Yang
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, PR China
| | - Shiyin Li
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, PR China
| | - Limin Zhang
- Green Economy Development Institute, Nanjing University of Finance and Economics, Nanjing, 210023, PR China; Jiangsu Engineering Lab of Water and Soil Eco-remediation, Nanjing Normal University, Nanjing, 210023, PR China.
| |
Collapse
|
797
|
Luo C, Wu D, Gan L, Cheng X, Ma Q, Tan F, Gao J, Zhou W, Wang S, Zhang F, Ma J. Oxidation of Congo red by thermally activated persulfate process: Kinetics and transformation pathway. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.116839] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
|
798
|
Efficient Malathion Removal in Constructed Wetlands Coupled to UV/H2O2 Pretreatment. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10155306] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Intensive agriculture has led to the increasing application of pesticides, such as malathion, thus generating large volumes of untreated cropland wastewater (CropWW). In this work, a hybrid system constructed wetlands (CW) coupled in continuous with an optimized UV/H2O2 pretreatment was evaluated for the efficient removal of malathion contained in CropWW. In the first stage, 90 min UV irradiation time (UV IR) and 65 mM hydrogen peroxide (H2O2) were identified as optimal operation parameters through a central composite design. The second stage consisted of CW planted with Phragmites australis collected from the agricultural discharge area and operated as a piston flow reactor. Furthermore, CW hydraulic residence times (HRT) of 1, 2 and 3 days, including hydraulic coupling, were evaluated. The removal efficiencies obtained in the first stage (UV/H2O2) were 94 ± 2.5% of malathion and 45 ± 2.5% of total organic carbon (TOC). In stage two (CW) 65 ± 9.6% TOC removal was achieved during the first 17 days, from which around 24% was associated to the biosorption of malathion byproducts. Subsequently, and until the operation ends, CW removed about 80% of TOC for 2 and 3 days HRT, with no significant differences (p > 0.2), which is higher than those reported in several studies involving only advanced oxidation processes (AOP) with UV IR times above 240 min and even for systems using catalysts. The results obtained indicate that the system UV/H2O2-CW is a technically suitable option for the treatment of CropWW with a high content of malathion mainly found in developing countries. Moreover, the hybrid system proposed also represent significant reduction in the size of the treatment plant.
Collapse
|
799
|
Wang HF, Hu H, Wang HJ, Bai YN, Shen XF, Zhang W, Zeng RJ. Comprehensive investigation of the relationship between organic content and waste activated sludge dewaterability. JOURNAL OF HAZARDOUS MATERIALS 2020; 394:122547. [PMID: 32289621 DOI: 10.1016/j.jhazmat.2020.122547] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 03/09/2020] [Accepted: 03/15/2020] [Indexed: 06/11/2023]
Abstract
The relationship between sludge organic fraction and its dewaterability is well known in practice. However, the formal study to reveal the underlying reason is limited. To improve understanding of the nature of organic content on sludge dewatering process, this study systematically evaluated the effects of sludge organic content on its dewaterability and revealed the underlying mechanism. Analysis of 10 waste activated sludge (WAS) samples with varying organic contents showed that capillary suction time (CST) increased linearly from 34.90 ± 0.10 s to 104.90 ± 0.30 s (R2 = 0.92, p < 0.01), whereas the solid content of centrifuge cake decreased from 21.23 %±0.45 % to 12.52 %±0.14 % (R2 = 0.89, p < 0.01) when organic fractionincreased from 35.72 % to 61.11 %. These results first confirmed that WAS dewatering performance was negatively correlated to its organic content. Then, the underlying mechanism was revealed by studying the basic physicochemical properties of WAS with various organic content. The results showed that sludge with a higher organic content generally had greater extracellular polymeric substances (EPS) content, lower density and higher negative zeta potential, which hinder the aggregation and flocculation of floc particles. These properties endow the WAS with a higher organic content generally possessed more bound water content, small pores, poorer fluidity, and stronger network strength. These characteristics can hamper the separation of water from sludge cake during dewatering. Based on which, this study discussed the potential of organic fraction as a surrogate of EPS for evaluating WAS dewaterability and indicated the organic fraction can be a useful and strong indicator of WAS dewaterability.
Collapse
Affiliation(s)
- Hou-Feng Wang
- Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China; CAS Key Laboratory for Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Hao Hu
- CAS Key Laboratory for Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China; School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei, Anhui 230022, China
| | - Hua-Jie Wang
- CAS Key Laboratory for Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China; School of Environmental and Chemical Engineering, Anhui Vocational and Technical College,Hefei, Anhui 230011, China
| | - Ya-Nan Bai
- CAS Key Laboratory for Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Xiao-Fei Shen
- College of Environmental Science and Technology, Anhui Normal University, Wuhu, Anhui 241000,China
| | - Wei Zhang
- CAS Key Laboratory for Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Raymond Jianxiong Zeng
- Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China; CAS Key Laboratory for Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China.
| |
Collapse
|
800
|
Li F, Duan F, Ji W, Gui X. Biochar-activated persulfate for organic contaminants removal: Efficiency, mechanisms and influencing factors. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 198:110653. [PMID: 32325258 DOI: 10.1016/j.ecoenv.2020.110653] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2020] [Revised: 03/09/2020] [Accepted: 04/15/2020] [Indexed: 06/11/2023]
Abstract
Turning biomass into biochar as a multifunctional carbon-based material for water remediation has attracted much research attention. Sawdust and rice husk were selected as feedstock for biochar (BC) production, aiming to explore their performance as a catalyst to activate persulfate (PS) for degrading acid orange 7 (AO7). There was an excellent synergistic effect in the combined BC/PS system. Sawdust biochar (MX) showed a faster and more efficient performance for the AO7 degradation due to its abundant oxygen functional groups, compared to rice husk biochar (DK). In the BC/PS system, AO7 was well decolorized and mineralized. Based on the two-dimensional correlation analysis method, the azo conjugation structure and naphthalene ring of AO7 molecule changed first then benzene ring changed during the reaction. Moreover, AO7 decolorization efficiency increased with the increase of PS concentration and biochar dosage, and the deacrease of pH. Biochar deactivated after used twice. When the biochar reached its adsorption equilibrium of AO7, the AO7 could not be degraded in the BC/PS system. SO4- and OH participated in the reaction together and OH played the main role in activating PS to AO7 decolorization based on the radical scavengers experiment. All of results indicate using biochar to activate PS for degradation of AO7 contaminated water is a promising method.
Collapse
Affiliation(s)
- Feiyue Li
- College of Resources and Environment Science, Anhui Science and Technology University, Fengyang, 233100, China.
| | - Fanglei Duan
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai, 201418, China
| | - Wenchao Ji
- College of Resources and Environment Science, Anhui Science and Technology University, Fengyang, 233100, China; Anhui Province Key Laboratory of Biochar and Cropland Pollution Prevention, Anhui Laimujia Biotechnology Co., Ltd., Huaiyuan, 233000, China
| | - Xiangyang Gui
- College of Resources and Environment Science, Anhui Science and Technology University, Fengyang, 233100, China
| |
Collapse
|