51
|
Abstract
Wastewater from the textile industry has a substantial impact on water quality. Synthetic dyes used in the textile production process are often discharged into water bodies as residues. Highly colored wastewater causes various of problems for the aquatic environment such as: reducing light penetration, inhibiting photosynthesis and being toxic to certain organisms. Since most dyes are resistant to biodegradation and are not completely removed by conventional methods (adsorption, coagulation-flocculation, activated sludge, membrane filtration) they persist in the environment. Advanced oxidation processes (AOPs) based on hydrogen peroxide (H2O2) have been proven to decolorize only some of the dyes from wastewater by photocatalysis. In this article, we compared two very different photocatalytic systems (UV/peroxydisulfate and UV/H2O2). Photocatalyzed activation of peroxydisulfate (PDS) generated sulfate radicals (SO4•−), which reacted with the selected anthraquinone dye of concern, Acid Blue 129 (AB129). Various conditions, such as pH and concentration of PDS were applied, in order to obtain an effective decolorization effect, which was significantly better than in the case of hydroxyl radicals. The kinetics of the reaction followed a pseudo-first order model. The main reaction pathway was also proposed based on quantum chemical analysis. Moreover, the toxicity of the solution after treatment was evaluated using Daphnia magna and Lemna minor, and was found to be significantly lower compared to the toxicity of the initial dye.
Collapse
|
52
|
Han CH, Park HD, Kim SB, Yargeau V, Choi JW, Lee SH, Park JA. Oxidation of tetracycline and oxytetracycline for the photo-Fenton process: Their transformation products and toxicity assessment. WATER RESEARCH 2020; 172:115514. [PMID: 31986402 DOI: 10.1016/j.watres.2020.115514] [Citation(s) in RCA: 103] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Revised: 01/11/2020] [Accepted: 01/14/2020] [Indexed: 06/10/2023]
Abstract
Advanced oxidation processes have gained significant attention for treating tetracycline (TC) and oxytetracycline (OTC), however, their oxidation using the photo-Fenton process has not been sufficiently studied. Although degradations of TC and OTC were enhanced by increasing H2O2 and Fe2+ within the ranges investigated (H2O2 = 20-50 mg/L and Fe = 1-10 mg/L) under UV irradiation, further experiments for the photo-Fenton process were conducted with 20 mg/L of H2O2 and 5 mg/L of Fe2+ to balance efficiency and cost. The photo-Fenton process (UV/H2O2/Fe2+) was shown to be more effective to remove TC and OTC than H2O2, ultraviolet (UV), and UV/H2O2 at the same doses of oxidants. Inorganic anions and cations were shown to inhibit the degradation of TC and OTC during the photo-Fenton process, in the following order: HPO42- > HCO3- ≫ SO42- > Cl- and Cu2+ ≫ Ca2+ > Na+. The TC and OTC degradation are generally improved by increasing pH, which is opposite to the kpCBA,obs values, caused by increasing the deprotonation degree of TC and OTC. Four and nine transformation products of TC and OTC, respectively, were detected over the treatment period. Among the transformation products, m/z 443.14 (C22H22N2O8) formed during TC degradation, and m/z 433.16 (C20H20N2O9) and m/z 415.15 (C20H18N2O8) formed during OTC degradation, were reported for the first time. Vibrio fischeri toxicity assessment indicated that the inhibition ratio was decreased with a decreasing TC concentration, while, OTC transformation lead to higher toxicity. The product (m/z 477.15b) was determined to be the compound causing toxicity during degradation of OTC by using the quantitative structure activity relationship (QSAR). This toxic transformation product caused higher inhibition ratios than its parental compound (OTC), but its further oxidization resulted in decreasing the inhibition ratios.
Collapse
Affiliation(s)
- Chee-Hun Han
- Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea; KU-KIST Green School, Graduate School of Energy and Environment, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Hee-Deung Park
- KU-KIST Green School, Graduate School of Energy and Environment, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea; School of Civil, Environmental and Architectural Engineering, Korea University, Anam-ro 145, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Song-Bae Kim
- Environmental Functional Materials and Water Treatment Laboratory, Department of Rural Systems Engineering, Seoul National University, Seoul, 08826, Republic of Korea; Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, 08826, Republic of Korea
| | - Viviane Yargeau
- Department of Chemical Engineering, McGill University, 3610, University St., Montréal, H3A 0C5, Québec, Canada
| | - Jae-Woo Choi
- Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Sang-Hyup Lee
- Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea; KU-KIST Green School, Graduate School of Energy and Environment, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea.
| | - Jeong-Ann Park
- Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, 08826, Republic of Korea; Department of Chemical Engineering, McGill University, 3610, University St., Montréal, H3A 0C5, Québec, Canada.
| |
Collapse
|
53
|
Lee J, von Gunten U, Kim JH. Persulfate-Based Advanced Oxidation: Critical Assessment of Opportunities and Roadblocks. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:3064-3081. [PMID: 32062964 DOI: 10.1021/acs.est.9b07082] [Citation(s) in RCA: 910] [Impact Index Per Article: 227.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Reports that promote persulfate-based advanced oxidation process (AOP) as a viable alternative to hydrogen peroxide-based processes have been rapidly accumulating in recent water treatment literature. Various strategies to activate peroxide bonds in persulfate precursors have been proposed and the capacity to degrade a wide range of organic pollutants has been demonstrated. Compared to traditional AOPs in which hydroxyl radical serves as the main oxidant, persulfate-based AOPs have been claimed to involve different in situ generated oxidants such as sulfate radical and singlet oxygen as well as nonradical oxidation pathways. However, there exist controversial observations and interpretations around some of these claims, challenging robust scientific progress of this technology toward practical use. This Critical Review comparatively examines the activation mechanisms of peroxymonosulfate and peroxydisulfate and the formation pathways of oxidizing species. Properties of the main oxidizing species are scrutinized and the role of singlet oxygen is debated. In addition, the impacts of water parameters and constituents such as pH, background organic matter, halide, phosphate, and carbonate on persulfate-driven chemistry are discussed. The opportunity for niche applications is also presented, emphasizing the need for parallel efforts to remove currently prevalent knowledge roadblocks.
Collapse
Affiliation(s)
- Jaesang Lee
- School of Civil, Environmental, and Architectural Engineering, Korea University, Seoul 136-701, Korea
| | - Urs von Gunten
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, Überlandstrasse 133, CH-8600, Düebendorf, Switzerland
- School of Architecture, Civil and Environmental Engineering (ENAC), École Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland
| | - Jae-Hong Kim
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06511, United States
| |
Collapse
|
54
|
Cai C, Kang S, Xie X, Liao C. Ultrasound-assisted heterogeneous peroxymonosulfate activation with Co/SBA-15 for the efficient degradation of organic contaminant in water. JOURNAL OF HAZARDOUS MATERIALS 2020; 385:121519. [PMID: 31706748 DOI: 10.1016/j.jhazmat.2019.121519] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Revised: 10/19/2019] [Accepted: 10/21/2019] [Indexed: 06/10/2023]
Abstract
A potential advanced oxidation process is provided by SBA-15 supported cobalt (Co/SBA-15) activated peroxymonosulfate (PMS, HSO5-) in the ultrasound (US) enhanced system, named Co/SBA-15/PMS/US process, for the elimination of refractory organic contaminants (ROCs) in water. This process exhibited favorable behavior with 95.5 % C.I. Acid Orange 7 (AO7) degradation using 5 mM PMS, 0.5 g/L Co/SBA-15 catalyst, 190 W US power at initial pH of 6.0 after 90 min reaction. Co/SBA-15 particles remained satisfied catalytic activity and stability with very low level of cobalt release in 10 successive cycles. The scavenge tests and electron paramagnetic resonance (EPR) result as well as the cobalt leaching concentration revealed that the reactive radicals (SO4- and OH) on catalyst surface were primarily responsible for AO7 oxidation, and a rational mechanism was elucidated accordingly. The presence of chloride ions and bicarbonate could improve AO7 removal. The probable pathway of AO7 degradation was proposed based on the intermediates identified. This Co/SBA-15/PMS/US process could be well applied for the destruction of other typical ROCs (bisphenol A, clofibric acid, and rhodamine B) and the treatment of lake and river water spiked with AO7, and this study may provide an efficient PMS technique for the remediation of ROCs in water.
Collapse
Affiliation(s)
- Chun Cai
- Department of Environmental Science and Engineering, Hubei Provincial Engineering Research Center of Systematic Water Pollution Control, China University of Geosciences, Wuhan 430074, China.
| | - Shuping Kang
- Department of Environmental Science and Engineering, Hubei Provincial Engineering Research Center of Systematic Water Pollution Control, China University of Geosciences, Wuhan 430074, China
| | - Xianjun Xie
- Department of Environmental Science and Engineering, Hubei Provincial Engineering Research Center of Systematic Water Pollution Control, China University of Geosciences, Wuhan 430074, China
| | - Chanjuan Liao
- College of Resources & Environment, Hunan Agricultural University, Changsha 410128, China
| |
Collapse
|
55
|
Sharma RK, Singh P, Setia A, Sharma AK. Insecticides and ovarian functions. ENVIRONMENTAL AND MOLECULAR MUTAGENESIS 2020; 61:369-392. [PMID: 31916619 DOI: 10.1002/em.22355] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 12/10/2019] [Accepted: 01/03/2020] [Indexed: 06/10/2023]
Abstract
Insecticides, a heterogeneous group of chemicals, are widely used in agriculture and household practices to avoid insect-inflicted damage. Extensive use of insecticides has contributed substantially to agricultural production and the prevention of deadly diseases by destroying their vectors. On the contrary, many of the insecticides are associated with several adverse health effects like neurological and psychological diseases, metabolic disorders, hormonal imbalance, and even cancer in non-target species, including humans. Reproduction, a very selective process that ensures the continuity of species, is affected to a greater extent by the rampant use of insecticides. In females, exposure to insecticides leads to reproductive incapacitation primarily through disturbances in ovarian physiology. Disturbed ovarian activities encompass the alterations in hormone synthesis, follicular maturation, ovulation process, and ovarian cycle, which eventually lead to decline in fertility, prolonged time-to-conceive, spontaneous abortion, stillbirths, and developmental defects. Insecticide-induced ovarian toxicity is effectuated by endocrine disruption and oxidative stress. Oxidative stress, which occurs due to suppression of antioxidant defense system, and upsurge of reactive oxygen and nitrogen species, potentiates DNA damage and expression of apoptotic and inflammatory markers. Insecticide exposure, in part, is responsible for ovarian malfunctioning through disruption of hypothalamic-pituitary-gonadal axis. The current article is focused on the adverse effects of insecticides on ovarian functioning, and consequently, on the reproductive efficacy of females. The possible strategies to combat insecticide-induced toxicity are also discussed in the latter part of this review. Environ. Mol. Mutagen. 61:369-392, 2020. © 2020 Wiley Periodicals, Inc.
Collapse
Affiliation(s)
- Rajnesh Kumar Sharma
- Reproductive Physiology Laboratory, Department of Zoology, Kurukshetra University, Kurukshetra, India
| | - Priyanka Singh
- Reproductive Physiology Laboratory, Department of Zoology, Kurukshetra University, Kurukshetra, India
| | - Aarzoo Setia
- Reproductive Physiology Laboratory, Department of Zoology, Kurukshetra University, Kurukshetra, India
| | - Aman Kumar Sharma
- Reproductive Physiology Laboratory, Department of Zoology, Kurukshetra University, Kurukshetra, India
| |
Collapse
|
56
|
Shah NS, Khan JA, Sayed M, Khan ZUH, Iqbal J, Arshad S, Junaid M, Khan HM. Synergistic effects of H2O2 and S2O82− in the gamma radiation induced degradation of congo-red dye: Kinetics and toxicities evaluation. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2019.115966] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
|
57
|
Xiao R, Ma J, Luo Z, Zeng W, Wei Z, Spinney R, Hu WP, Dionysiou DD. Experimental and theoretical insight into hydroxyl and sulfate radicals-mediated degradation of carbamazepine. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 257:113498. [PMID: 31761579 DOI: 10.1016/j.envpol.2019.113498] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2019] [Revised: 10/13/2019] [Accepted: 10/25/2019] [Indexed: 06/10/2023]
Abstract
Carbamazepine (CBZ), a widely detected pharmaceutical in wastewaters, cannot currently be treated by conventional activated sludge technologies, as it is highly resistant to biodegradation. In this study, the degradation kinetics and reaction mechanisms of CBZ by hydroxyl radical (OH) and sulfate radical ()-based advanced oxidation processes (AOPs) were investigated with a combined experimental/theoretical approach. We first measured the UV absorption spectrum of CBZ and compared it to the theoretical spectrum. The agreement of two spectra reveals an extended π-conjugation system on CBZ molecular structure. The second-order rate constants of OH and with CBZ, measured by competition kinetics method, were (4.63 ± 0.01) × 109 M-1 s-1 and (8.27 ± 0.01) × 108 M-1 s-1, respectively at pH 3. The energetics of the initial steps of CBZ reaction with OH and were also calculated by density functional theory (DFT) at SMD/M05-2X/6-311++G**//M05-2X/6-31 + G**level. Our results reveal that radical addition is the dominant pathway for both OH and . Further, compared to the positive ΔGR0 value for the single electron transfer (SET) reaction pathway between CBZ and OH, the ΔGR0 value for SET reaction between CBZ and is negative, showing that this reaction route is thermodynamically favorable. Our results demonstrated the remarkable advantages of AOPs for the removal of refractory organic contaminants during wastewater treatment processes. The elucidation of the pathways for the reaction of OH and with CBZ are beneficial to predict byproducts formation and assess associated ecotoxicity, providing an evaluation mean for the feasibility of AOPs application.
Collapse
Affiliation(s)
- Ruiyang Xiao
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, China
| | - Junye Ma
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, China
| | - Zonghao Luo
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, China
| | - Weizhi Zeng
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, China.
| | - Zongsu Wei
- Centre for Water Technology (WATEC), Department of Engineering, Aarhus University, Hangøvej 2, DK-8200, Aarhus N, Denmark
| | - Richard Spinney
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH, 43210, USA
| | - Wei-Ping Hu
- Department of Chemistry and Biochemistry, National Chung Cheng University, Chia‒Yi, 62102, Taiwan
| | - Dionysios D Dionysiou
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, OH, 45221, USA
| |
Collapse
|
58
|
Ecer Uzun Ç, Kabdaşlı I, Olmez-Hanci T, Tünay O. Sulfate radical-based oxidation of an alcohol ethoxylate (Brij30 ®) by the PS/UV-C process. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2020; 81:383-394. [PMID: 32333670 DOI: 10.2166/wst.2020.118] [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
In this study, sulfate radical-based oxidation of an alcohol ethoxylate (AE) was explored by the persulfate (PS)/UV-C process. Poly(oxyethylene)(4)laurylether, commercially known as Brij30®, was used as a model AE. PS/UV-C oxidation of aqueous Brij30® (8-20 mg/L) was performed at initial PS concentrations varying between 0.50 and 6.50 mM and at initial pH values of 3.0 and 6.0. Results indicated that an increase in both initial PS and Brij30® concentrations did not have a significant effect on Brij30® removal efficiency and that Brij30® abatements of more than 90% could be achieved after 60 min of treatment time. Total organic carbon (TOC) removals were significantly improved with increasing initial PS concentrations for both initial pH values. On the other hand, an increase in initial Brij30® concentration had a negative effect on mineralization. By employing the competitive kinetic method, the second-order reaction rate coefficient of Brij30® with the sulfate radical (SO4 •-) was determined as 1.62 × 109 ± 3.5 × 107 M-1s-1. The second-order reaction rate constant of TOC, originating from Brij30® and reaction intermediates, was found to be 9.09 × 105 ± 2.91 × 105 M-1s-1 and 1.13 × 106 ± 0.46 × 106 M-1s-1 for pH values of 6.0 and 3.0, respectively. Toxicity of PS/UV-C treated aqueous Brij30® solutions towards Vibrio fischeri was also investigated to determine the possible toxic behavior of oxidation products.
Collapse
Affiliation(s)
- Ç Ecer Uzun
- Civil Engineering Faculty, Environmental Engineering Department, Istanbul Technical University, Ayazağa Campus, İstanbul 34469, Turkey E-mail:
| | - I Kabdaşlı
- Civil Engineering Faculty, Environmental Engineering Department, Istanbul Technical University, Ayazağa Campus, İstanbul 34469, Turkey E-mail:
| | - T Olmez-Hanci
- Civil Engineering Faculty, Environmental Engineering Department, Istanbul Technical University, Ayazağa Campus, İstanbul 34469, Turkey E-mail:
| | - O Tünay
- Civil Engineering Faculty, Environmental Engineering Department, Istanbul Technical University, Ayazağa Campus, İstanbul 34469, Turkey E-mail:
| |
Collapse
|
59
|
Zhang L, Liu Y, Fu Y. Degradation kinetics and mechanism of diclofenac by UV/peracetic acid. RSC Adv 2020; 10:9907-9916. [PMID: 35498603 PMCID: PMC9050214 DOI: 10.1039/d0ra00363h] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Accepted: 02/29/2020] [Indexed: 11/21/2022] Open
Abstract
In this work, the degradation kinetics and mechanism of diclofenac (DCF) by UV/peracetic acid (PAA) was investigated.
Collapse
Affiliation(s)
- Li Zhang
- Faculty of Geosciences and Environmental Engineering
- Southwest Jiaotong University
- Chengdu 611756
- China
| | - Yiqing Liu
- Faculty of Geosciences and Environmental Engineering
- Southwest Jiaotong University
- Chengdu 611756
- China
| | - Yongsheng Fu
- Faculty of Geosciences and Environmental Engineering
- Southwest Jiaotong University
- Chengdu 611756
- China
| |
Collapse
|
60
|
Qi Y, Qu R, Liu J, Chen J, Al-Basher G, Alsultan N, Wang Z, Huo Z. Oxidation of flumequine in aqueous solution by UV-activated peroxymonosulfate: Kinetics, water matrix effects, degradation products and reaction pathways. CHEMOSPHERE 2019; 237:124484. [PMID: 31394442 DOI: 10.1016/j.chemosphere.2019.124484] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2019] [Revised: 07/11/2019] [Accepted: 07/29/2019] [Indexed: 06/10/2023]
Abstract
The degradation of flumequine (FLU) in aqueous solution by ultraviolet (UV)-activated peroxymonosulfate (PMS) was investigated in this work. Under the conditions of [PMS]0:[FLU]0 = 1:1, T = 25 ± 2 °C, pH = 7.0 ± 0.1, nearly complete removal of FLU was achieved after 60 min. The effects of various operating parameters, including oxidant doses, pH, the presence of typical ions (NH4+、Mg2+、Fe3+、Cl-、NO3-、HCO3-) and humic acid were evaluated. It was found that the pseudo-first-order rate constants of FLU degradation increased with increasing PMS dosage and decreasing solution pH. The presence of Mg2+ could accelerate FLU removal, while Fe3+, HCO3-, NO3- and HA inhibited the reaction. Moreover, the degradation of FLU in different water matrices were also explored, and the removal followed the order of Tap water > Ultrapure water > River water > Secondary clarifier effluent. According to the control and radical quenching experiment results, direct photolysis and reactive radicals (SO4- and HO) contributed mainly to FLU degradation in the UV/PMS system. Initial FLU molecule underwent reactions such as hydroxylation, hydroxyl substitution, demethylation, decarboxylation/decarbonylation and ring opening, leading to the formation of nineteen oxidation products. The effective degradation by UV/PMS suggests a feasible technology for treating FLU in waters and wastewaters.
Collapse
Affiliation(s)
- Yumeng Qi
- 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
| | - Jiaoqin Liu
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Jiangsu, Nanjing, 210023, PR China
| | - Jing Chen
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Jiangsu, Nanjing, 210023, PR China
| | - Gadah Al-Basher
- King Saud University, College of Science, Zoology Department, P.O. Box 2455, Riyadh, 11451, Saudi Arabia
| | - Nouf Alsultan
- King Saud University, College of Science, Zoology Department, P.O. Box 2455, Riyadh, 11451, Saudi Arabia
| | - Zunyao Wang
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Jiangsu, Nanjing, 210023, PR China.
| | - Zongli Huo
- Jiangsu Provincial Center for Disease Control and Prevention, No.172 Jiangsu Road, Jiangsu, Nanjing, 210009, PR China.
| |
Collapse
|
61
|
Huang J, Zhang H. Mn-based catalysts for sulfate radical-based advanced oxidation processes: A review. ENVIRONMENT INTERNATIONAL 2019; 133:105141. [PMID: 31520961 DOI: 10.1016/j.envint.2019.105141] [Citation(s) in RCA: 98] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 08/08/2019] [Accepted: 08/28/2019] [Indexed: 06/10/2023]
Abstract
Sulfate radical-based advanced oxidation processes (AOPs) have drawn increasing attention during the past two decades, and Mn-based materials have been proven to be effective catalysts for activating peroxymonosulfate (PMS) and peroxydisulfate (PDS) to degrade many contaminants. This article presents a comprehensive review of various Mn-based materials to activate PMS and PDS. The activation mechanisms of different Mn-based catalysts (i.e., Mn oxides MnOx, MnOx hybrids, and MnOx‑carbonaceous material composites) were first summarized and discussed in detail. Besides the commonly reported free radicals (SO4-• and •OH), non-radical mechanisms such as singlet oxygen and direct electron transfer have also been discovered for selected materials. The effects of pH, inorganic ions, natural organic matter (NOM), dissolved oxygen content, temperature, and the crystallinity of the materials on the catalytic reactivity were also discussed. Then, important instrumentations and technologies employed to characterize Mn-based materials and to understand the reaction mechanisms were concisely summarized. Three common overlooks in the experimental designs for examining the PMS/PDS-MnOx systems were also discussed. Finally, future research directions were suggested to further improve the technology and to provide a guidance to develop cost-effective Mn-based materials to activate PMS/PDS.
Collapse
Affiliation(s)
- Jianzhi Huang
- Department of Civil Engineering, Case Western Reserve University, Cleveland, OH 44106, United States
| | - Huichun Zhang
- Department of Civil Engineering, Case Western Reserve University, Cleveland, OH 44106, United States.
| |
Collapse
|
62
|
Chen T, Ma J, Zhang Q, Xie Z, Zeng Y, Li R, Liu H, Liu Y, Lv W, Liu G. Degradation of propranolol by UV-activated persulfate oxidation: Reaction kinetics, mechanisms, reactive sites, transformation pathways and Gaussian calculation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 690:878-890. [PMID: 31302552 DOI: 10.1016/j.scitotenv.2019.07.034] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Revised: 06/21/2019] [Accepted: 07/03/2019] [Indexed: 06/10/2023]
Abstract
Contamination with β-blockers such as propranolol (PRO) poses a potential threat to human health and ecological system. The present study investigated the kinetics and mechanisms of PRO degradation by UV-activated persulfate (UV/PS) oxidation. Here, the experimental results showed that the degradation of PRO followed pseudo-first-order reaction kinetics, the degradation rate constant (kobs) was increased dramatically with increasing PS dosage or decreasing initial PRO concentration. And increasing the initial solution pH could also enhance the degradation efficiency of PRO. Radical scavenging experiments demonstrated that the main radical species was sulfate radicals (SO4•-), with hydroxyl radicals (HO·) playing a less important role. Meanwhile, the second-order rate constants of PRO degradation with SO4•- and HO· were determined to be 1.94 × 1010 M-1 s-1 and 6.77 × 109 M-1 s-1, respectively. In addition, the presence of natural organic matter (NOM) and nitrate anion (NO3-) showed inhibitory effect on PRO degradation, whereas bicarbonate anion (HCO3-) and chlorine anion (Cl-) greatly enhanced the degradation of PRO. Moreover, the transformation products of PRO were identified by applying ultra performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry (UPLC/Q-TOF-MS) technique. Molecular orbital calculations were used to estimate the reaction site of PRO with radicals, simultaneously. Hence, the transformation pathways including hydroxylation, dehydration, naphthalene ring opening, and the cleavage of aldehyde groups were proposed. This work enriches the mechanism of PRO degradation under UV/PS system on the basis of results obtained by experimental characterization and Gaussian theoretical calculation.
Collapse
Affiliation(s)
- Tiansheng Chen
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Jingshuai Ma
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Qianxin Zhang
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Zhijie Xie
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Yongqin Zeng
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Ruobai Li
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Haijin Liu
- School of Environment, Henan Normal University, Key Laboratory for Yellow River and Huaihe River Water Environment and Pollution Control, Xinxiang 453007, China
| | - Yang Liu
- Faculty of Environmental & Biological Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, China
| | - Wenying Lv
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
| | - Guoguang Liu
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
| |
Collapse
|
63
|
Abbas T, Wadhawan T, Khan A, McEvoy J, Khan E. Iron turning waste media for treating Endosulfan and Heptachlor contaminated water. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 685:124-133. [PMID: 31174112 DOI: 10.1016/j.scitotenv.2019.05.424] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2019] [Revised: 05/12/2019] [Accepted: 05/28/2019] [Indexed: 06/09/2023]
Abstract
This study explored the application of iron turning waste for the degradation of heptachlor and endosulfan. In batch experiments, 2.5 g of iron turning waste efficiently removed 96% of heptachlor and 85% of endosulfan in 200 mL of water (20 μg/L for each pesticide) in ten minutes. By increasing the iron turning dose from 1 g to 2.5 g, pseudo second order removal rates of heptachlor and endosulfan increased 1.5-fold and 1.37-fold, respectively. Among the minerals in groundwater, calcium and potassium lowered heptachlor removal (8-10%), whereas their effect on endosulfan removal was minimal. Endosulfan removal increased 16%, when water pH was raised from 4 to 10. The effect of water pH on heptachlor removal was minimal. The removal of heptachlor and endosulfan dropped to 55% and 46%, respectively, when the initial concentration was 1 μg/L. In a continuous flow system, iron turning worked better in combination with sand media. Water flow rate (5-15 mL/min) had a limited effect on the removal of both pesticides (initial concentration of 2 μg/L) which increased with increasing iron turning dose (100-150 g) for endosulfan. Heptachlor removal remained stable (100%) regardless of the iron turning amount (100-150 g) used in a filtration column. Iron turning based filter completely removed heptachlor throughout the filtration period (600 h), whereas endosulfan removal dropped from 100% to 88-90% after 300 h. Endosulfan and heptachlor were degraded into nonanal and heptanal, respectively. Iron turning waste was characterized using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) before and after its reactions with both pesticides. XRD and XPS analyses revealed that virgin iron turning waste consisted of zerovalent iron (Fe0) and iron oxides, and Fe0 was transformed to magnetite (Fe3O4) after reacting with both pesticides. Based on detected degradation by-products, the removal mechanism and degradation pathways for both pesticides were elucidated.
Collapse
Affiliation(s)
- Tauqeer Abbas
- Department of Civil and Environmental Engineering, North Dakota State University, Fargo, ND, 58108-6050, USA.
| | | | - Asad Khan
- Department of Chemical Engineering, COMSATS University Islamabad, Lahore Campus, Lahore, Pakistan.
| | - John McEvoy
- Department of Microbiological Sciences, North Dakota State University, Fargo, ND 58108-6050, USA.
| | - Eakalak Khan
- Department of Civil and Environmental Engineering and Construction, University of Nevada, Las Vegas, Las Vegas, NV 89154-4015, USA.
| |
Collapse
|
64
|
Shang K, Li W, Wang X, Lu N, Jiang N, Li J, Wu Y. Degradation of p-nitrophenol by DBD plasma/Fe2+/persulfate oxidation process. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2019.02.046] [Citation(s) in RCA: 75] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
65
|
Chen G, Liu F, Qiao Y, Tao B. Photodegradation of tefuryltrione in water under UV irradiation: Identification of transformation products and elucidation of photodegradation pathway. CHEMOSPHERE 2019; 227:133-141. [PMID: 30986595 DOI: 10.1016/j.chemosphere.2019.03.174] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 03/10/2019] [Accepted: 03/26/2019] [Indexed: 06/09/2023]
Abstract
Photodegradation is an important abiotic degradation process in the aquatic environment. In this study, the photodegradation of tefuryltrione in aqueous solution was investigated under UV-Visible irradiation. Effects of carbonate (CO32-), bicarbonate (HCO3-), nitrate (NO3-), hydrogen phosphate (HPO42-), potassium (K+), and ammonium (NH4+) on the photodegradation kinetics of tefuryltrione were evaluated. Results showed that tefuryltrione photodegradation was increased by HCO3-, CO32-, and NO3- in the range of 0.1-10 mmol L-1; decreased by HPO42-; and insignificantly affected by K+ and NH4+. Twelve main transformation products (TPs) were separated and identified on the basis of mass spectrum data assigned by elemental-composition calculations, comparison of structural analogs, and available literature. A tentative photodegradation pathway was further proposed depending on the identified TPs and their kinetic evolutions. Results indicated that TP 1 was generated by the hydroxyl that substituted for chlorine, TP 2 was formed by the cleavage of the ether bond of tefuryltrione, and TPs 3-6 were formed by the breakage of the CC bond of the keto moiety of tefuryltrione. Further, TPs 9-12 were formed by the rearrangement of tefuryltrione-photodegradation products. These findings are highly important for elucidating the environmental fate of tefuryltrione in aquatic ecosystems.
Collapse
Affiliation(s)
- Guofeng Chen
- College of Agriculture, Northeast Agricultural University, Harbin, 150030, Heilongjiang, China; Safety and Quality Institute of Agricultural Products, Heilongjiang Academy of Agricultural Sciences, Harbin, 150086, China
| | - Feng Liu
- Safety and Quality Institute of Agricultural Products, Heilongjiang Academy of Agricultural Sciences, Harbin, 150086, China
| | - Yuxin Qiao
- College of Agriculture, Northeast Agricultural University, Harbin, 150030, Heilongjiang, China
| | - Bo Tao
- College of Agriculture, Northeast Agricultural University, Harbin, 150030, Heilongjiang, China.
| |
Collapse
|
66
|
Exhaustive Photocatalytic Lindane Degradation by Combined Simulated Solar Light-Activated Nanocrystalline TiO2 and Inorganic Oxidants. Catalysts 2019. [DOI: 10.3390/catal9050425] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Organochlorine compounds (OCs) are very toxic, highly persistent, and ubiquitous contaminants in the environment. Degradation of lindane, a selected OC, by simulated solar light-activated TiO2 (SSLA-TiO2) photocatalysis was investigated. The film types of the TiO2 photocatalyst were prepared using a dip-coating method. The physical properties of the films were investigated using X-ray diffraction, transmission electron microscopy, and environmental scanning electron microscopy. The SSLA-TiO2 photocatalysis led to a lindane removal of 23% in 6 h, with 0.042 h−1 of an observed pseudo first-order rate constant (kobs). The SSLA-TiO2 photocatalysis efficiency was greatly enhanced by adding hydrogen peroxide (H2O2), persulfate (S2O82−), or both combined, corresponding to a 64%, 89%, and 99% lindane removal in the presence of 200 µM of H2O2, S2O82−, or equimolar H2O2-S2O82−, respectively. The hydroxyl and sulfate radicals mainly participated in lindane degradation, proven by the results of a radical scavenger study. The degradation kinetics were hindered in the presence of the water constituents, indicated by a 61%, 35%, 50%, 70%, 88%, and 91% degradation of lindane in 6 h, using a SSLA-TiO2/S2O82−/H2O2 photocatalysis system containing 1.0 mg L−1 humic acid (HA), or 1 mM of CO32−, HCO3−, NO3−, SO42−, and Cl−, respectively. The TiO2 film demonstrated high reusability during four runs of lindane decomposition experiments. The SSLA-TiO2/S2O82−/H2O2 photocatalysis is very effective for the elimination of a persistent OC, lindane, from a water environment.
Collapse
|
67
|
Wang Y, Tian D, Chu W, Li M, Lu X. Nanoscaled magnetic CuFe2O4 as an activator of peroxymonosulfate for the degradation of antibiotics norfloxacin. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2018.11.051] [Citation(s) in RCA: 73] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
|
68
|
Degradation of neonicotinoids by UV irradiation: Kinetics and effect of real water constituents. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2018.09.076] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
|
69
|
Rodríguez-Mata AE, Amabilis-Sosa LE, Roé-Sosa A, Barrera-Andrade JM, Rangel-Peraza JG, Salinas-Juárez MG. Quantification of recalcitrant organic compounds during their removal test by a novel and economical method based on chemical oxygen demand analysis. KOREAN J CHEM ENG 2019. [DOI: 10.1007/s11814-018-0203-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
70
|
Oxidative Degradation of Tannic Acid in Aqueous Solution by UV/S2O82− and UV/H2O2/Fe2+ Processes: A Comparative Study. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app9010156] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Tannic acid (TA) is a major pollutant present in the wastewater generated from vegetable tanneries process and food processing. This work studied TA degradation by two advanced oxidation processes (APOs): UV irradiation at the wavelength of 254 nm in the presence of hydrogen peroxide (H2O2) and ferrous iron (photo-Fenton) and in the presence of potassium persulfate. The influence of certain experimental parameters such as K2S2O8, H2O2, Fe2+, and TA concentrations, initial pH and temperature was evaluated in order to obtain the highest efficiency in terms of aromatics (decay in UV absorbance at 276 nm) and TOC removals. Chemical oxidation of TA (0.1 mM) by UV/persulfate achieved 96.32% of aromatics removal and 54.41% of TOC removal under optimized conditions of pH = 9 and 53.10 mM of K2S2O8 after 60 min. The treatment of TA by photo-Fenton process successfully led to almost complete aromatics removal (99.32%) and high TOC removal (94.27%) from aqueous solutions containing 0.1 mM of TA at natural pH = 3 using 29.4 mM of H2O2 and 0.18 mM of Fe2+ at 25 °C after 120 min. More efficient degradation of TA by photo-Fenton process than UV/persulfate was obtained, which confirms that hydroxyl radicals are more powerful oxidants than sulfate radicals. The complete removal of organic pollution from natural waters can be accomplished by direct chemical oxidation via hydroxyl radicals generated from photocatalytic decomposition of H2O2.
Collapse
|
71
|
Liu T, Yin K, Liu C, Luo J, Crittenden J, Zhang W, Luo S, He Q, Deng Y, Liu H, Zhang D. The role of reactive oxygen species and carbonate radical in oxcarbazepine degradation via UV, UV/H 2O 2: Kinetics, mechanisms and toxicity evaluation. WATER RESEARCH 2018; 147:204-213. [PMID: 30312793 DOI: 10.1016/j.watres.2018.10.007] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 10/01/2018] [Accepted: 10/04/2018] [Indexed: 05/17/2023]
Abstract
Oxcarbazepine (OXC) is ubiquitous in the aqueous environment. And due to its ecotoxicological effects and potential risks to human, an effective way to eliminate OXC from aqueous environment has aroused public concerns in recent years. Radical-based reactions have been shown to be an efficient way for OXC destruction, but the reactions of OXC with reactive oxygen species (ROS) and carbonate radical (CO3•-) are still unclear. In this study, we focused the degradation of OXC and ROS, CO3•- generation mechanism, and their roles in OXC degradation via UV and UV/H2O2. The triplet state of oxcarbazepine (3OXC∗) was found to play an important role in OXC degradation via UV. And hydroxyl radicals (•OH) and singlet oxygen (1O2) were found to be the dominant ROS in OXC degradation. Superoxide radical (O2•-) did not react with OXC directly, but it may react with intermediate byproducts. Generation of CO3•- played a positive role on OXC degradation for both UV and UV/H2O2. In addition to •OH, 3OXC* also contribute to CO3•- production. The second-order rate constants of OXC with •OH and CO3•- were 1.7 × 1010 M-1 s-1 and 8.6 × 107 M-1 s-1, respectively. Potential OXC degradation mechanisms by •OH were proposed and included hydroxylation, α-ketol rearrangement, and benzylic acid rearrangement. Compared with non-selective •OH, the reactions involving CO3•- are mainly electron transfer and hydrogen abstraction. And the acute toxicity of OXC was lower after UV/H2O2 and UV/H2O2/HCO3- treatments, which was confirmed by luminescent bacterial assay (Vibrio fischeri bacterium).
Collapse
Affiliation(s)
- Tongcai Liu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, 410082, PR China
| | - Kai Yin
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, 410082, PR China
| | - Chengbin Liu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, 410082, PR China
| | - Jinming Luo
- Brook Byers Institute for Sustainable Systems and School of Civil and Environmental Engineering, Georgia Institute of Technology, 828 West Peachtree Street, Atlanta, GA, 30332, United States.
| | - John Crittenden
- Brook Byers Institute for Sustainable Systems and School of Civil and Environmental Engineering, Georgia Institute of Technology, 828 West Peachtree Street, Atlanta, GA, 30332, United States
| | - Weiqiu Zhang
- Brook Byers Institute for Sustainable Systems and School of Civil and Environmental Engineering, Georgia Institute of Technology, 828 West Peachtree Street, Atlanta, GA, 30332, United States
| | - Shenglian Luo
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, 410082, PR China; Department of Environmental and Chemical Engineering, Nanchang Hongkong University, Nanchang, 330063, China
| | - Qunying He
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, 410082, PR China
| | - Yongxiu Deng
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, 410082, PR China
| | - Hui Liu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, 410082, PR China
| | - Danyu Zhang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, 410082, PR China
| |
Collapse
|
72
|
Rehman F, Sayed M, Khan JA, Shah NS, Khan HM, Dionysiou DD. Oxidative removal of brilliant green by UV/S 2O 82‒, UV/HSO 5‒ and UV/H 2O 2 processes in aqueous media: A comparative study. JOURNAL OF HAZARDOUS MATERIALS 2018; 357:506-514. [PMID: 30008383 DOI: 10.1016/j.jhazmat.2018.06.012] [Citation(s) in RCA: 106] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Revised: 05/24/2018] [Accepted: 06/04/2018] [Indexed: 06/08/2023]
Abstract
The removal of brilliant green (BG), a toxic organic and cationic dye, has been examined by UV/S2O82- (PS), UV/HSO5- (PMS) and UV/H2O2 processes. BG showed insignificant direct photolysis at 254 nm (i.e., 8.6% after 30 min). However, enhanced BG degradation was observed in UV/PS, UV/PMS and UV/H2O2 systems as revealed from 63.1, 47.0 and 34.8% BG degradation, respectively, at 30 min of reaction time, using 0.05 mM BG and 1.0 mM oxidant initial concentration. The bimolecular rate constants of OH and SO4- with BG were determined to be 2.35 × 109 and 2.21 × 109 M-1 s-1, respectively. Electrical energy per order (EE/O) values for UV/PS, UV/PMS and UV/H2O2 processes were calculated to be 5.4, 6.8, and 7.8 KWh/m3/order, respectively. The addition of humic acid (HA) and inorganic anions inhibited the degradation of BG by UV/PS in the order of NO2- > HA > HCO3- > Cl- > NO3- ≈ SO42-. The results of frontier electron densities (FEDs) showed that C-atom holding the three rings (C7), and C-atoms at para positions to N-alkyl groups of the two rings (C4 and C14) are the predominant sites for radical addition. Furthermore, nine degradation products (DPs) of BG were detected experimentally using LC/MS/MS.
Collapse
Affiliation(s)
- Faiza Rehman
- Environmental Engineering and Science Program, Department of Chemical and Environmental Engineering, University of Cincinnati, 705 Engineering Research Center, Cincinnati, OH, 45221-0012, United States; Radiation and Environmental Chemistry Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, 25120, Pakistan; Department of Chemistry, The University of Poonch Rawalakot, Azad Jammu & Kashmir, Pakistan
| | - Murtaza Sayed
- Radiation and Environmental Chemistry Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, 25120, Pakistan
| | - Javed Ali Khan
- Environmental Engineering and Science Program, Department of Chemical and Environmental Engineering, University of Cincinnati, 705 Engineering Research Center, Cincinnati, OH, 45221-0012, United States; Radiation and Environmental Chemistry Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, 25120, Pakistan
| | - Noor S Shah
- Environmental Engineering and Science Program, Department of Chemical and Environmental Engineering, University of Cincinnati, 705 Engineering Research Center, Cincinnati, OH, 45221-0012, United States; Radiation and Environmental Chemistry Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, 25120, Pakistan; Department of Environmental Sciences, COMSATS University Islamabad, Vehari Campus, 61100, Pakistan
| | - Hasan M Khan
- Radiation and Environmental Chemistry Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, 25120, Pakistan
| | - Dionysios D Dionysiou
- Environmental Engineering and Science Program, Department of Chemical and Environmental Engineering, University of Cincinnati, 705 Engineering Research Center, Cincinnati, OH, 45221-0012, United States; Nireas-International Water Research Centre, University of Cyprus, P.O. Box 20537, Nicosia, 1678, Cyprus.
| |
Collapse
|
73
|
A Akveran G, Köse K, Köse DA. Solvent effect on endosulfan adsorption onto polymeric arginine-methacrylate cryogels. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:25458-25467. [PMID: 29951763 DOI: 10.1007/s11356-018-2531-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2018] [Accepted: 06/11/2018] [Indexed: 06/08/2023]
Abstract
Endosulfan is a persistent insecticide that is still used in some countries even though it is life-threatening and banned in the agricultural struggle. The solubility of pesticides in water is negligible. It is known that pesticides with better solubility in organic solvents have different solubility when the dielectric constants of these solvents are taken into account. The polymeric structure of arginine was modified with methacrylate to be a functional monomer, and it was immobilized on a solid support, poly(HEMA), and finally, poly(2-hydroxyethyl methacrylate-arginine methacrylate) was obtained and used as an effective adsorbent. The effect of organic solvents on endosulfan adsorption was investigated for the first time in the literature. Endosulfan was removed from alcohol media by using this polymeric structure synthesized by exploiting alcoho-phobic interaction in this work. Nuclear magnetic resonance (NMR), elemental analysis, and Fourier transform infrared spectroscopy (FTIR) methods were used for the structural characterization and therefore to prove successful synthesis of cryogels. Morphological characteristics were also investigated by scanning electron microscopy (SEM), an N2 adsorption method, and swelling test. Adsorption experiments were carried out against varying interaction time and concentration parameters in the batch system. Since the alcohol used as a solvent has a pH value close to the ionic strength of drinking water, no change was made in the pH of the solution. Endosulfan molecules dissolved in solvents such as toluene, dichloromethane, acetone, and chloroform were removed using poly(HEMA-ArMA) cryogels to determine the solvent effect on the adsorption of endosulfan. As expected, the removal of endosulfan from the solvent toluene provided the best result. Although the adsorption in toluene is almost 9.5 times higher than that in ethanol, the use of toluene in the adsorption process due to its chemical structure is not feasible. Thus, experiments were carried out in ethanol.
Collapse
Affiliation(s)
- Gönül A Akveran
- Alaca Avni Çelik Vocational School, Department of Food Processing, Hitit University, Çorum, Turkey
| | - Kazım Köse
- Alaca Avni Çelik Vocational School, Department of Food Processing, Hitit University, Çorum, Turkey.
| | - Dursun A Köse
- Faculty of Science and Literature, Department of Chemistry, Hitit University, Çorum, Turkey
| |
Collapse
|
74
|
Flouret A, de Almeida MC, de Oliveira TF, de Sá FP. Advanced treatment of phenol by H 2O 2/UV/activated carbon coupling: Influence of homogeneous and heterogeneous phase. CAN J CHEM ENG 2018. [DOI: 10.1002/cjce.23186] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Alexandre Flouret
- Institute Superior d’ Agriculture - ISA - Lille; 48 Boulevard Vauban 59046 Lille Cedex France
| | - Maria Carolina de Almeida
- School of Agronomy and Food Engineering; Federal University of Goiás-UFG; Km-0, Caixa Postal 131 CEP 74690-900 Goiânia Brasil
| | - Tatianne Ferreira de Oliveira
- School of Agronomy and Food Engineering; Federal University of Goiás-UFG; Km-0, Caixa Postal 131 CEP 74690-900 Goiânia Brasil
| | - Fernando Pereira de Sá
- Federal Institutes of Education; Science and Technology of Goiás − IFG; Inhumas Goiás Brazil
| |
Collapse
|
75
|
Ji Y, Yang Y, Zhou L, Wang L, Lu J, Ferronato C, Chovelon JM. Photodegradation of sulfasalazine and its human metabolites in water by UV and UV/peroxydisulfate processes. WATER RESEARCH 2018; 133:299-309. [PMID: 29407711 DOI: 10.1016/j.watres.2018.01.047] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Revised: 12/28/2017] [Accepted: 01/20/2018] [Indexed: 06/07/2023]
Abstract
The widespread occurrence of pharmaceuticals and their metabolites in natural waters has raised great concerns about their potential risks on human health and ecological systems. This study systematically investigates the degradation of sulfasalazine (SSZ) and its two human metabolites, sulfapyridine (SPD) and 5-aminosalicylic acid (5-ASA), by UV and UV/peroxydisulfate (UV/PDS) processes. Experimental results show that SPD and 5-ASA were readily degraded upon UV 254 nm direct photolysis, with quantum yields measured to be (8.6 ± 0.8) × 10-3 and (2.4 ± 0.1) × 10-2 mol Einstein-1, respectively. Although SSZ was resistant to direct UV photolysis, it could be effectively removed by both UV/H2O2 and UV/PDS processes, with fluence-based pseudo-first-order rate constants determined to be 0.0030 and 0.0038 cm2 mJ-1, respectively. Second-order rate constant between SO4•- and SSZ was measured as (1.33 ± 0.01) × 109 M-1s-1 by competition kinetic method. A kinetic model was established for predicting the degradation rate of SSZ in the UV/PDS process. Increasing the dosage of PDS significantly enhanced the degradation of SSZ in the UV/PDS process, which can be well predicted by the developed kinetic model. Natural water constituents, such as natural organic matter (NOM) and bicarbonate (HCO3-), influenced the degradation of SSZ differently. The azo functional group of SSZ molecule was predicted as the reactive site susceptible to electrophilic attack by SO4•- by frontier electron densities (FEDs) calculations. Four intermediate products arising from azo bond cleavage and SO2 extrusion were identified by solid phase extraction-liquid chromatography-triple quadrupole mass spectrometry (SPE-LC-MS/MS). Based on the products identified, detailed transformation pathways for SSZ degradation in the UV/PDS system were proposed. Results reveal that UV/PDS could be an efficient approach for remediation of water contaminated by SSZ and its metabolites.
Collapse
Affiliation(s)
- Yuefei Ji
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
| | - Yan Yang
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Lei Zhou
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, F-69626, Villeurbanne, France
| | - Lu Wang
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Junhe Lu
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
| | - Corinne Ferronato
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, F-69626, Villeurbanne, France
| | - Jean-Marc Chovelon
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, F-69626, Villeurbanne, France
| |
Collapse
|
76
|
Liu W, Yang Q, Wang Z, Lv X, Yang Z. Photocatalytic degradation of trichloroethylene over BiOCl under UV irradiation. Appl Organomet Chem 2018. [DOI: 10.1002/aoc.4354] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Wei Liu
- School of Water Resources and Environment China University of Geosciences (Beijing) China
- Beijing Key laboratory of Water Resource & Environmental Engineering China University of Geosciences (Beijing) Beijing 100083 China
| | - Qi Yang
- School of Water Resources and Environment China University of Geosciences (Beijing) China
- Beijing Key laboratory of Water Resource & Environmental Engineering China University of Geosciences (Beijing) Beijing 100083 China
| | - Zhen Wang
- School of Water Resources and Environment China University of Geosciences (Beijing) China
- Beijing Key laboratory of Water Resource & Environmental Engineering China University of Geosciences (Beijing) Beijing 100083 China
| | - Xiaofan Lv
- School of Water Resources and Environment China University of Geosciences (Beijing) China
- Beijing Key laboratory of Water Resource & Environmental Engineering China University of Geosciences (Beijing) Beijing 100083 China
| | - Zhilin Yang
- School of Water Resources and Environment China University of Geosciences (Beijing) China
- Beijing Key laboratory of Water Resource & Environmental Engineering China University of Geosciences (Beijing) Beijing 100083 China
| |
Collapse
|
77
|
Costa NM, Silva VM, Damaceno G, Sousa RMF, Richter EM, Machado AEH, Trovó AG. Integrating coagulation-flocculation and UV-C or H 2O 2/UV-C as alternatives for pre- or complete treatment of biodiesel effluents. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2017; 203:229-236. [PMID: 28783019 DOI: 10.1016/j.jenvman.2017.07.069] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Revised: 07/23/2017] [Accepted: 07/25/2017] [Indexed: 06/07/2023]
Abstract
The feasibility of biodiesel effluent treatment combining coagulation-flocculation with a photolytic process was evaluated, being the photolytic process involving the irradiation of the effluent by UV-C, or by UV-C irradiation with simultaneous addition of H2O2 (H2O2/UV-C). The coagulation-flocculation was performed at the natural pH of the effluent (pH 2.9) using different Fe3+ salts (chloride, nitrate and sulfate) at different concentrations (0.25, 0.50 and 1.0 mmol L-1) of the counterions. The best results were achieved using 0.50 mmol L-1 Fe(NO3)3. Following, the degradation of the organic load and toxicity reduction of the pre-treated effluent by UV-C irradiation was evaluated. The H2O2/UV-C process showed to be advantageous, mainly when multiple additions of H2O2 were used during the course of the reaction. Additionally, the influence of the initial pH on the degradation was also evaluated. A high level of mineralization (94%) was achieved after 6 h of irradiation concomitantly with multiple additions of 2,000 mg L-1 H2O2, and with the effluent at the natural pH. Thus, using coagulation-flocculation followed by the H2O2/UV-C process, it was possible to achieve a favourable condition for reuse of the pre-treated effluent, since, in addition to the significant reduction of the organic load, the final DBO5 (<120 mg L-1) and oils & fats (<50 mg L-1) are below the limits established by the Brazilian legislation. Furthermore, a reduction of 78% of acute toxicity to V. fischeri (from 89% to 20%) was reached. The results suggest, therefore, that this process is a viable option for treatment of this kind of effluent.
Collapse
Affiliation(s)
- Nayara M Costa
- Universidade Federal de Uberlândia, Instituto de Química, 38400-902, Uberlândia, MG, Brazil.
| | - Valdislaine M Silva
- Universidade Federal de Uberlândia, Instituto de Química, 38400-902, Uberlândia, MG, Brazil.
| | - Gizele Damaceno
- Universidade Federal de Uberlândia, Instituto de Química, 38400-902, Uberlândia, MG, Brazil.
| | - Raquel M F Sousa
- Universidade Federal de Uberlândia, Instituto de Química, 38400-902, Uberlândia, MG, Brazil.
| | - Eduardo M Richter
- Universidade Federal de Uberlândia, Instituto de Química, 38400-902, Uberlândia, MG, Brazil.
| | - Antonio E H Machado
- Universidade Federal de Uberlândia, Instituto de Química, 38400-902, Uberlândia, MG, Brazil.
| | - Alam G Trovó
- Universidade Federal de Uberlândia, Instituto de Química, 38400-902, Uberlândia, MG, Brazil.
| |
Collapse
|
78
|
Ji Y, Wang L, Jiang M, Lu J, Ferronato C, Chovelon JM. The role of nitrite in sulfate radical-based degradation of phenolic compounds: An unexpected nitration process relevant to groundwater remediation by in-situ chemical oxidation (ISCO). WATER RESEARCH 2017; 123:249-257. [PMID: 28672209 DOI: 10.1016/j.watres.2017.06.081] [Citation(s) in RCA: 79] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Revised: 06/24/2017] [Accepted: 06/27/2017] [Indexed: 06/07/2023]
Abstract
As promising in-situ chemical oxidation (ISCO) technologies, sulfate radical-based advanced oxidation processes (SR-AOPs) are applied in wastewater treatment and groundwater remediation in recent years. In this contribution, we report for the first time that, thermally activated persulfate oxidation of phenol in the presence of nitrite (NO2-), an anion widely present in natural waters, could lead to the formation of nitrated by-products including 2-nitrophenol (2-NP), 4-nitrophenol (4-NP), 2,4-dinitrophenol (2,4-DNP), and 2,6-dinitrophenol (2,6-DNP). Nitrogen dioxide radical (NO2•), arising from SO4•- scavenging by NO2-, was proposed to be involved in the formation of nitrophenols as a nitrating agent. It was observed that nitrophenols accounted for approximately 70% of the phenol transformed under reaction conditions of [NO2-] = 200 μM, [PS] = 2 mM and temperature of 50 °C. Increasing the concentration of NO2- remarkably enhanced the formation of nitrophenols but did not affect the transformation rate of phenol significantly. The degradation of phenol and the formation of nitrophenols were significantly influenced by persulfate dosage, solution pH and natural organic matter (NOM). Further studies on the degradation of other phenolic compounds, including 4-chlorophenol (4-CP), 4-hydroxybenzoic acid (4-HBA), and acetaminophen (ATP), verified the formation of their corresponding nitrated by-products as well. Therefore, formation of nitrated by-products is probably a common but overlooked phenomenon during SO4•--based oxidation of phenolic compounds in the presence of NO2-. Nitroaromatic compounds are well known for their carcinogenicity, mutagenicity and genotoxicity, and are potentially persistent in the environment. The formation of nitrated organic by-products in SR-AOPs should be carefully scrutinized, and risk assessment should be carried out to assess possible health and ecological impacts.
Collapse
Affiliation(s)
- Yuefei Ji
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
| | - Lu Wang
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Mengdi Jiang
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Junhe Lu
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
| | - Corinne Ferronato
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, F-69626, Villeurbanne, France
| | - Jean-Marc Chovelon
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, F-69626, Villeurbanne, France
| |
Collapse
|
79
|
Yun ET, Yoo HY, Bae H, Kim HI, Lee J. Exploring the Role of Persulfate in the Activation Process: Radical Precursor Versus Electron Acceptor. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:10090-10099. [PMID: 28753284 DOI: 10.1021/acs.est.7b02519] [Citation(s) in RCA: 135] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This study elucidates the mechanism behind persulfate activation by exploring the role of various oxyanions (e.g., peroxymonosulfate, periodate, and peracetate) in two activation systems utilizing iron nanoparticle (nFe0) as the reducing agent and single-wall carbon nanotubes (CNTs) as electron transfer mediators. Since the tested oxyanions serve as both electron acceptors and radical precursors in most cases, oxidative degradation of organics was achievable through one-electron reduction of oxyanions on nFe0 (leading to radical-induced oxidation) and electron transfer mediation from organics to oxyanions on CNTs (leading to oxidative decomposition involving no radical formation). A distinction between degradative reaction mechanisms of the nFe0/oxyanion and CNT/oxyanion systems was made in terms of the oxyanion consumption efficacy, radical scavenging effect, and EPR spectral analysis. Statistical study of substrate-specificity and product distribution implied that the reaction route induced on nFe0 varies depending on the oxyanion (i.e., oxyanion-derived radical), whereas the similar reaction pathway initiates organic oxidation in the CNT/oxyanion system irrespective of the oxyanion type. Chronoamperometric measurements further confirmed electron transfer from organics to oxyanions in the presence of CNTs, which was not observed when applying nFe0 instead.
Collapse
Affiliation(s)
- Eun-Tae Yun
- School of Civil, Environmental, and Architectural Engineering, Korea University , Seoul 136-701, Korea
| | - Ha-Young Yoo
- School of Civil, Environmental, and Architectural Engineering, Korea University , Seoul 136-701, Korea
| | - Hyokwan Bae
- Department of Civil and Environmental Engineering, Pusan National University , Busan 46241, Korea
| | - Hyoung-Il Kim
- School of Civil and Environmental Engineering, Yonsei University , Seoul 120-749, Korea
| | - Jaesang Lee
- School of Civil, Environmental, and Architectural Engineering, Korea University , Seoul 136-701, Korea
| |
Collapse
|
80
|
Khan AM, Mehmood A, Sayed M, Nazar MF, Ismail B, Khan RA, Ullah H, Abdur Rehman HM, Khan AY, Khan AR. Influence of acids, bases and surfactants on the photocatalytic degradation of a model dye rhodamine B. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.04.063] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
|
81
|
Gao Y, Li Y, Yao L, Li S, Liu J, Zhang H. Catalyst-free activation of peroxides under visible LED light irradiation through photoexcitation pathway. JOURNAL OF HAZARDOUS MATERIALS 2017; 329:272-279. [PMID: 28183016 DOI: 10.1016/j.jhazmat.2017.01.046] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2016] [Revised: 01/22/2017] [Accepted: 01/24/2017] [Indexed: 06/06/2023]
Abstract
Catalysts are known to activate peroxides to generate active radicals (i.e., hydroxyl radical (OH) and sulfate radical (SO4-)) under certain conditions, but the activation of peroxides in the absence of catalysts under visible light irradiation has been rarely reported. This work demonstrates a catalyst-free activation of peroxides for the generation of OH and/or SO4- through photoexcited electron transfer from organic dyes to peroxides under visible LED light irradiation, where Rhodamine B (RhB) and Eosin Y (EY) were selected as model dyes. The formation of OH and/or SO4- in the reactions and the electron transfer from the excited dyes to peroxides were validated via electron paramagnetic resonance (EPR), photoluminescence (PL) spectra and cyclic voltammetry (CV). The performance of the peroxide/dye/Vis process was demonstrated to be altered depending on the target substrate. Meanwhile, the peroxide/dye/Vis process was effective for simultaneous decolorization of dyes and production of active radicals under neutral even or basic conditions. The findings of this study clarified a novel photoexcitation pathway for catalyst-free activation of peroxides under visible light irradiation, which could avoid the secondary metal ion (dissolved or leached) pollution from the metal-based catalysts and expand the application range of the peroxide-based catalytic process.
Collapse
Affiliation(s)
- Yaowen Gao
- Department of Environmental Engineering, Wuhan University, Wuhan, 430079, China; Shenzhen Research Institute of Wuhan University, Shenzhen, 518057, China
| | - Yixi Li
- Department of Environmental Engineering, Wuhan University, Wuhan, 430079, China
| | - Linyu Yao
- Department of Environmental Engineering, Wuhan University, Wuhan, 430079, China
| | - Simiao Li
- Department of Environmental Engineering, Wuhan University, Wuhan, 430079, China
| | - Jin Liu
- Department of Environmental Engineering, Wuhan University, Wuhan, 430079, China
| | - Hui Zhang
- Department of Environmental Engineering, Wuhan University, Wuhan, 430079, China; Shenzhen Research Institute of Wuhan University, Shenzhen, 518057, China.
| |
Collapse
|
82
|
Bamba D, Coulibaly M, Robert D. Nitrogen-containing organic compounds: Origins, toxicity and conditions of their photocatalytic mineralization over TiO 2. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 580:1489-1504. [PMID: 28041693 DOI: 10.1016/j.scitotenv.2016.12.130] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Revised: 12/19/2016] [Accepted: 12/19/2016] [Indexed: 05/21/2023]
Abstract
Sustainable water management remains a global concern to meet the food needs of industrial and agricultural activities. Therefore, pollution abatement techniques, cheap and environmentally, are highly desired and recommended. The present review is devoted to the origin and the toxicity of nitrogen-containing organic compounds in water. The progress made in removing these pollutants, in recent years, is addressed. However, a prominent place is given to the photocatalytic degradation process using the TiO2 as a semiconductor, the conditions for good mineralization and especially the factors influencing it. The parameters that impact the performance of this method are the pH, the temperature, the reactor used, the light, the concentration of the pollutant, the amount of catalyst, etc. Up to now, the importance of one parameter relative to another has not been established because in the context of the photocatalytic degradation, certain parameters are often tightly coupled. Consequently, the mineralization is dependent on the initial degree of oxidation of nitrogen atom contained in the pollutant to be degraded. The hydroxyl nitrogen is primarily converted into nitrate ions (NO3-), while the amides and the primary amines are converted into ammonium ions (NH4+).
Collapse
Affiliation(s)
- Drissa Bamba
- Laboratoire de Chimie des Eaux (LCE) - Ecole Normale Supérieure d'Abidjan, 08 BP 10 Abidjan 08, Côte d'Ivoire; ICPEES-UMR 7515 CNRS - Université de Strasbourg, Antenne de Saint-Avold, Rue Victor Démange, 57500 Saint-Avold, France.
| | - Mariame Coulibaly
- Laboratoire de Chimie des Eaux (LCE) - Ecole Normale Supérieure d'Abidjan, 08 BP 10 Abidjan 08, Côte d'Ivoire.
| | - Didier Robert
- ICPEES-UMR 7515 CNRS - Université de Strasbourg, Antenne de Saint-Avold, Rue Victor Démange, 57500 Saint-Avold, France.
| |
Collapse
|
83
|
Soares PA, Souza R, Soler J, Silva TF, Souza SMGU, Boaventura RA, Vilar VJ. Remediation of a synthetic textile wastewater from polyester-cotton dyeing combining biological and photochemical oxidation processes. Sep Purif Technol 2017. [DOI: 10.1016/j.seppur.2016.08.036] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
84
|
Wang D, Duan X, He X, Dionysiou DD. Degradation of dibutyl phthalate (DBP) by UV-254 nm/H 2O 2 photochemical oxidation: kinetics and influence of various process parameters. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:23772-23780. [PMID: 27623856 DOI: 10.1007/s11356-016-7569-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Accepted: 08/31/2016] [Indexed: 06/06/2023]
Abstract
Degradation of dibuytl phthalate (DBP), a plasticizer and also a widely distributed endocrine disruptor, by UV-254 nm/H2O2 advanced oxidation process (AOP) was investigated in this study. A significant DBP removal of 77.1 % at an initial concentration of 1.0 μM was achieved at UV fluence of 160 mJ/cm2, initial H2O2 dosage of 1.0 mM, and pH of 7.6 ± 0.1. The DBP degradation exhibited a pseudo-first-order reaction kinetic pattern, with the rate constants linearly increasing with increasing H2O2 dosage while decreasing with increasing initial DBP concentration and pH value in a specific range. DBP destruction was significantly inhibited in the presence of alkalinity and natural organic matter (NOM), two known factors that should be taken a serious consideration of in the research and design of UV/H2O2-based AOPs. Presence of common inorganic anions (i.e., Cl-, SO42-, and NO3-) and metal cations (i.e., Fe3+ and Zn2+) had a slight impact on the degradation of DBP, although Cu2+ could improve the degradation efficiency even at a concentration as low as 0.01 mg/L, suggesting a strong potential of applying UV/H2O2 for the removal of DBP with an environmental relevant level of copper.
Collapse
Affiliation(s)
- Dong Wang
- SINOPEC Beijing Research Institute of Chemical Industry, Beijing, 102500, China
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, OH, 45221-0012, USA
| | - Xiaodi Duan
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, OH, 45221-0012, USA
| | - Xuexiang He
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, OH, 45221-0012, USA
| | - Dionysios D Dionysiou
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, OH, 45221-0012, USA.
| |
Collapse
|
85
|
Gu Y, Chen Y, Sun X, Liu Y. Comparison on mineralization of 2,4,6-tribromophenol by UV-based advanced oxidation processes: UV/Na2S2O8 and UV/H2O2. RESEARCH ON CHEMICAL INTERMEDIATES 2016. [DOI: 10.1007/s11164-016-2812-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
86
|
Ahn YY, Yun ET, Seo JW, Lee C, Kim SH, Kim JH, Lee J. Activation of Peroxymonosulfate by Surface-Loaded Noble Metal Nanoparticles for Oxidative Degradation of Organic Compounds. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:10187-10197. [PMID: 27564590 DOI: 10.1021/acs.est.6b02841] [Citation(s) in RCA: 122] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This study demonstrates the capability of noble metal nanoparticles immobilized on Al2O3 or TiO2 support to effectively activate peroxymonosulfate (PMS) and degrade select organic compounds in water. The noble metals outperformed a benchmark PMS activator such as Co(2+) (water-soluble) for PMS activation and organic compound degradation at acidic pH and showed the comparable activation capacity at neutral pH. The efficiency was found to depend on the type of noble metal (following the order of Pd > Pt ≈ Au ≫ Ag), the amount of noble metal deposited onto the support, solution pH, and the type of target organic substrate. In contrast to common PMS-activated oxidation processes that involve sulfate radical as a main oxidant, the organic compound degradation kinetics were not affected by sulfate radical scavengers and exhibited substrate dependency that resembled the PMS activated by carbon nanotubes. The results presented herein suggest that noble metals can mediate electron transfer from organic compounds to PMS to achieve persulfate-driven oxidation, rather than through reductive conversion of PMS to reactive sulfate radical.
Collapse
Affiliation(s)
- Yong-Yoon Ahn
- Civil, Environmental, and Architectural Engineering, Korea University , Seoul 136-701, Korea
| | - Eun-Tae Yun
- Civil, Environmental, and Architectural Engineering, Korea University , Seoul 136-701, Korea
| | - Ji-Won Seo
- Urban and Environmental Engineering, KIST-UNIST-Ulsan Center for Convergent Materials (KUUC), Ulsan National Institute of Science and Technology , Ulsan 698-805, Korea
| | - Changha Lee
- Urban and Environmental Engineering, KIST-UNIST-Ulsan Center for Convergent Materials (KUUC), Ulsan National Institute of Science and Technology , Ulsan 698-805, Korea
| | - Sang Hoon Kim
- Center for Materials Architecturing, Korea Institute of Science and Technology (KIST) , Seoul 136-701, Korea
| | - Jae-Hong Kim
- Chemical and Environmental Engineering, Yale University , New Haven, Connecticut 06511, United States
| | - Jaesang Lee
- Civil, Environmental, and Architectural Engineering, Korea University , Seoul 136-701, Korea
- Energy Environmental Policy and Technology, Green School, Korea University-KIST , Seoul 136-701, Korea
| |
Collapse
|
87
|
Liu Y, He X, Fu Y, Dionysiou DD. Quantitative assessment on the contribution of direct photolysis and radical oxidation in photochemical degradation of 4-chlorophenol and oxytetracycline. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:14307-14315. [PMID: 27055892 DOI: 10.1007/s11356-016-6561-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Accepted: 03/24/2016] [Indexed: 06/05/2023]
Abstract
In UV-254 nm/H2O2 advanced oxidation process (AOP), the potential degradation pathways for organic pollutants include (1) hydrolysis, (2) direct H2O2 oxidation, (3) UV direct photolysis, and (4) hydroxyl radical (HO(•)) reaction. In this study, the contribution of these pathways was quantitatively assessed in the photochemical destruction of 4-chlorophenol (4-CP), demonstrating pathways (3) and (4) to be predominantly responsible for the removal of 4-CP by UV/H2O2 in 50 mM phosphate buffer solution. Increasing reaction pH could significantly enhance the contribution of direct photolysis in UV/H2O2 process. The contribution of HO(•) oxidation was improved with increasing initial H2O2 concentration probably due to the increased formation of HO(•). Presence of sodium carbonate (Na2CO3) as in UV/H2O2/Na2CO3 system promoted the degradation of 4-CP, with carbonate radical (CO3 (•-)) reaction and direct photolysis identified to be the main contributing pathways. The trends in the contribution of each factor were further evaluated and validated on the degradation of the antibiotic compound oxytetracycline (OTC). This study provides valuable information on the relative importance of different reaction pathways on the photochemical degradation of organic contaminants such as 4-CP and OTC in the presence and absence of a CO3 (•-) precursor.
Collapse
Affiliation(s)
- Yiqing Liu
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, 611756, China
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, OH, 45221-0012, USA
| | - Xuexiang He
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, OH, 45221-0012, USA
| | - Yongsheng Fu
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, 611756, China.
| | - Dionysios D Dionysiou
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, OH, 45221-0012, USA.
| |
Collapse
|
88
|
Shah NS, Khan JA, Al-Muhtaseb AH, Sayed M, Khan HM. Gamma radiolytic decomposition of endosulfan in aerated solution: the role of carbonate radical. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:12362-12371. [PMID: 26979317 DOI: 10.1007/s11356-016-6415-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2016] [Accepted: 03/02/2016] [Indexed: 06/05/2023]
Abstract
The present study elaborates the removal of endosulfan, an emerging water pollutant and potential carcinogenic, in aerated solution. The influence of Cl(-), NO3 (-), NO2 (-), CO3 (2-), HCO3 (-), SO3 (2-), and humic acid was assessed on the radiolytic degradation of endosulfan. A strong inhibition on the radiolytic degradation of endosulfan was observed in the presence of NO3 (-), NO2 (-), and SO3 (2-). Instead, a slight increase in the removal efficiency of endosulfan was observed at high concentrations of CO3 (2-) and HCO3 (-). The formation of CO3 (•-) in radiolytic degradation of endosulfan in the presence of CO3 (2-) and HCO3 (-) was demonstrated by adding SO3 (2-) that rapidly react with CO3 (•-). The results indicate that CO3 (•-) formed from the reactions of CO3 (2-) and HCO3 (-) and commonly found in natural water can play an important role in the degradation of endosulfan and other sulfur containing electron-rich compounds. The study showed faster degradation of endosulfan at lower concentration compared to high concentration and removal was found to follow pseudo-first-order kinetic. Endosulfan ether was found as the main degradation product and degradation pathway was found to be initiated at the S=O bond of endosulfan. The efficiency of gamma irradiation in the removal of endosulfan was examined in terms of formation of short chain organic acids and chloride ion accumulation.
Collapse
Affiliation(s)
- Noor S Shah
- Department of Environmental Sciences, COMSATS Institute of Information Technology, Vehari, 61100, Pakistan.
- Radiation Chemistry Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, 25120, Pakistan.
| | - Javed Ali Khan
- Radiation Chemistry Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, 25120, Pakistan
| | - Ala'a H Al-Muhtaseb
- Petroleum and Chemical Engineering Department, Faculty of Engineering, Sultan Qaboos University, Muscat, Oman
| | - Murtaza Sayed
- Radiation Chemistry Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, 25120, Pakistan
- Department of Chemistry, COMSATS Institute of Information Technology, Abbotabad, 22060, Pakistan
| | - Hasan M Khan
- Radiation Chemistry Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, 25120, Pakistan.
| |
Collapse
|
89
|
Lama Y, Sinha A, Singh G, Masto RE. Reductive dehalogenation of endosulfan by cast iron: Kinetics, pathways and modeling. CHEMOSPHERE 2016; 150:772-780. [PMID: 26653031 DOI: 10.1016/j.chemosphere.2015.11.034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Revised: 11/03/2015] [Accepted: 11/11/2015] [Indexed: 06/05/2023]
Abstract
Cast iron has been a material of choice for in-situ remediation of groundwater. In this study interaction of endosulfan with High Carbon Iron Filings (HCIF) was studied in batch reactors. Decline in total concentration (Ct) could be related to aqueous concentration (Ca) by equation dCt/dt = k1.M.Ca(n), where reaction rate constant (k1) and order (n) were found to be 1.246 × 10(-4) L g(-1) iron h(-1) and 1.47, respectively. Partitioning of endosulfan to HCIF could be explained by Freundlich isotherm. The process of simultaneous reductive dehalogenation and adsorption/desorption was successfully modelled. The reductive dehalogenation of endosulfan resulted in by-products identified as [(3a, alpha,7beta,7a alpha,8s)-4,5,6,7,8 Pentachloro 3a,4,7,7a-tetrahydro] (C9H3Cl5O3) and Benzofuran,4,5,7-trichloro-2,3-dihydro-2-methyl (C9H7Cl3O).
Collapse
Affiliation(s)
- Yangdup Lama
- Department of Environmental Science and Engineering, Indian School of Mines, Dhanbad, Jharkhand 826004, India
| | - Alok Sinha
- Department of Environmental Science and Engineering, Indian School of Mines, Dhanbad, Jharkhand 826004, India.
| | - Gurdeep Singh
- Department of Environmental Science and Engineering, Indian School of Mines, Dhanbad, Jharkhand 826004, India
| | - Reginald E Masto
- Environmental Management Division, Central Institute of Mining and Fuel Research (Digwadih Campus), PO: FRI, Dhanbad, Jharkhand 828108, India
| |
Collapse
|
90
|
Liu Y, He X, Fu Y, Dionysiou DD. Kinetics and mechanism investigation on the destruction of oxytetracycline by UV-254nm activation of persulfate. JOURNAL OF HAZARDOUS MATERIALS 2016; 305:229-239. [PMID: 26686482 DOI: 10.1016/j.jhazmat.2015.11.043] [Citation(s) in RCA: 163] [Impact Index Per Article: 20.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Revised: 10/19/2015] [Accepted: 11/21/2015] [Indexed: 06/05/2023]
Abstract
Oxytetracycline (OTC), an important broad-spectrum antibiotic, has been detected extensively in various environmental systems, which may have a detrimental impact on ecosystem and human health through the development of drug resistant bacteria and pathogens. In this study, the degradation of OTC was evaluated by UV-254nm activated persulfate (PS). The observed UV fluence based pseudo first-order rate constant (kobs) was found to be the highest at near neutral pH conditions (pH 5.5-8.5). Presence of various natural water constituents had different effects on OTC degradation, with a significant enhancement in the presence of bicarbonate or Cu(2+). Limited elimination of total organic carbon (TOC) and PS was observed during the mineralization of OTC. Transformation byproducts in the presence and absence of hydroxyl radical scavenging agent tert-butanol (t-BuOH) were identified using ultra-high definition accurate-mass quadrupole time-of-flight liquid chromatography/mass spectrometer (LC-QTOF/MS). Potential OTC degradation mechanism was subsequently proposed revealing four different reaction pathways by SO4(-) reaction including hydroxylation (+16Da), demethylation (-14Da), decarbonylation (-28Da) and dehydration (-18Da). This study suggests that UV-254nm/PS is a promising treatment technology for the control of water pollution caused by emerging contaminants such as OTC.
Collapse
Affiliation(s)
- Yiqing Liu
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China; Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, OH 45221-0012, United States
| | - Xuexiang He
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, OH 45221-0012, United States
| | - Yongsheng Fu
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China
| | - Dionysios D Dionysiou
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, OH 45221-0012, United States.
| |
Collapse
|
91
|
Khan S, He X, Khan HM, Boccelli D, Dionysiou DD. Efficient degradation of lindane in aqueous solution by iron (II) and/or UV activated peroxymonosulfate. J Photochem Photobiol A Chem 2016. [DOI: 10.1016/j.jphotochem.2015.10.004] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
92
|
Soares PA, Silva TF, Ramos Arcy A, Souza SMGU, Boaventura RA, Vilar VJ. Assessment of AOPs as a polishing step in the decolourisation of bio-treated textile wastewater: Technical and economic considerations. J Photochem Photobiol A Chem 2016. [DOI: 10.1016/j.jphotochem.2015.10.017] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
93
|
Salim MMFF, Novack A, Soares PA, Medeiros Â, Granato MA, Souza AAU, Vilar VJP, Guelli U. Souza SMA. Photochemical UVC/H2O2 oxidation system as an effective method for the decolourisation of bio-treated textile wastewaters: towards onsite water reuse. RSC Adv 2016. [DOI: 10.1039/c6ra15615k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A photochemical UVC/H2O2 oxidation system was applied for the decolourisation of two real textile wastewaters collected after biological oxidation from two different textile wastewater treatment plants.
Collapse
Affiliation(s)
- Márcia M. F. F. Salim
- LABMASSA – Mass Transfer Laboratory
- Universidade Federal de Santa Catarina
- Departamento de Engenharia Química e Engenharia de Alimentos
- 88040-900 Florianópolis
- Brasil
| | - Aline Novack
- LABMASSA – Mass Transfer Laboratory
- Universidade Federal de Santa Catarina
- Departamento de Engenharia Química e Engenharia de Alimentos
- 88040-900 Florianópolis
- Brasil
| | - Petrick A. Soares
- LABMASSA – Mass Transfer Laboratory
- Universidade Federal de Santa Catarina
- Departamento de Engenharia Química e Engenharia de Alimentos
- 88040-900 Florianópolis
- Brasil
| | - Ângela Medeiros
- LABMASSA – Mass Transfer Laboratory
- Universidade Federal de Santa Catarina
- Departamento de Engenharia Química e Engenharia de Alimentos
- 88040-900 Florianópolis
- Brasil
| | - Miguel A. Granato
- LABMASSA – Mass Transfer Laboratory
- Universidade Federal de Santa Catarina
- Departamento de Engenharia Química e Engenharia de Alimentos
- 88040-900 Florianópolis
- Brasil
| | - Antonio A. U. Souza
- LABMASSA – Mass Transfer Laboratory
- Universidade Federal de Santa Catarina
- Departamento de Engenharia Química e Engenharia de Alimentos
- 88040-900 Florianópolis
- Brasil
| | - Vítor J. P. Vilar
- Laboratory of Separation and Reaction Engineering – Laboratory of Catalysis and Materials (LSRE-LCM)
- Departamento de Engenharia Química
- Faculdade de Engenharia
- Universidade do Porto
- 4200-465 Porto
| | - Selene M. A. Guelli U. Souza
- LABMASSA – Mass Transfer Laboratory
- Universidade Federal de Santa Catarina
- Departamento de Engenharia Química e Engenharia de Alimentos
- 88040-900 Florianópolis
- Brasil
| |
Collapse
|
94
|
Khan JA, Shah NS, Khan HM. Decomposition of atrazine by ionizing radiation: Kinetics, degradation pathways and influence of radical scavengers. Sep Purif Technol 2015. [DOI: 10.1016/j.seppur.2015.09.064] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
95
|
Mirsoleimani-azizi SM, Amooey AA, Ghasemi S, Salkhordeh-panbechouleh S. Modeling the Removal of Endosulfan from Aqueous Solution by Electrocoagulation Process Using Artificial Neural Network (ANN). Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b02846] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
Affiliation(s)
| | - Ali Akbar Amooey
- Department of Chemical
Engineering and ‡Faculty of Chemistry, University of Mazandaran, Babolsar 47416-95447, Iran
| | - Shahram Ghasemi
- Department of Chemical
Engineering and ‡Faculty of Chemistry, University of Mazandaran, Babolsar 47416-95447, Iran
| | | |
Collapse
|
96
|
Misra N. The contribution of non-thermal and advanced oxidation technologies towards dissipation of pesticide residues. Trends Food Sci Technol 2015. [DOI: 10.1016/j.tifs.2015.06.005] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
97
|
Eskandarloo H, Badiei A, Behnajady MA. Optimization of UV/inorganic oxidants system efficiency for photooxidative removal of an azo textile dye. DESALINATION AND WATER TREATMENT 2015; 55:210-226. [DOI: 10.1080/19443994.2014.912965] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
|
98
|
Shah NS, He X, Khan JA, Khan HM, Boccelli DL, Dionysiou DD. Comparative studies of various iron-mediated oxidative systems for the photochemical degradation of endosulfan in aqueous solution. J Photochem Photobiol A Chem 2015. [DOI: 10.1016/j.jphotochem.2015.03.014] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
99
|
Sharma J, Mishra IM, Kumar V. Degradation and mineralization of Bisphenol A (BPA) in aqueous solution using advanced oxidation processes: UV/H2O2 and UV/S2O8(2-) oxidation systems. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2015; 156:266-75. [PMID: 25889275 DOI: 10.1016/j.jenvman.2015.03.048] [Citation(s) in RCA: 94] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2015] [Revised: 03/25/2015] [Accepted: 03/28/2015] [Indexed: 05/03/2023]
Abstract
This work reports on the removal and mineralization of an endocrine disrupting chemical, Bisphenol A (BPA) at a concentration of 0.22 mM in aqueous solution using inorganic oxidants (hydrogen peroxide, H2O2 and sodium persulfate, Na2S2O8;S2O8(2-)) under UV irradiation at a wavelength of 254 nm and 40 W power (Io = 1.26 × 10(-6) E s(-1)) at its natural pH and a temperature of 29 ± 3 °C. With an optimum persulfate concentration of 1.26 mM, the UV/S2O8(2-) process resulted in ∼95% BPA removal after 240 min of irradiation. The optimum BPA removal was found to be ∼85% with a H2O2 concentration of 11.76 mM. At higher concentrations, either of the oxidants showed an adverse effect because of the quenching of the hydroxyl or sulfate radicals in the BPA solution. The sulfate-based oxidation process could be used over a wider initial pH range of 3-12, but the hydroxyl radical-based oxidation of BPA should be carried out in the acidic pH range only. The water matrix components (bicarbonate, chloride and humic acid) showed higher scavenging effect in hydroxyl radical-based oxidation than that in the sulfate radical-based oxidation of BPA. UV/S2O8(2-) oxidation system utilized less energy (307 kWh/m(3)) EE/O in comparison to UV/H2O2 system (509 kWh/m(3)) under optimum operating conditions. The cost of UV irradiation far outweighed the cost of the oxidants in the process. However, the total cost of treatment of persulfate-based system was much lower than that of H2O2-based oxidation system.
Collapse
Affiliation(s)
- Jyoti Sharma
- Department of Chemical Engineering, Indian Institute of Technology, Roorkee, Roorkee 247667, Uttarakhand, India
| | - I M Mishra
- Department of Chemical Engineering, Indian Institute of Technology, Roorkee, Roorkee 247667, Uttarakhand, India.
| | - Vineet Kumar
- Department of Chemical Engineering, Indian Institute of Technology, Roorkee, Roorkee 247667, Uttarakhand, India
| |
Collapse
|
100
|
Khan JA, Shah NS, Nawaz S, Ismail M, Rehman F, Khan HM. Role of eaq⁻, ·OH and H· in radiolytic degradation of atrazine: a kinetic and mechanistic approach. JOURNAL OF HAZARDOUS MATERIALS 2015; 288:147-157. [PMID: 25725267 DOI: 10.1016/j.jhazmat.2014.11.026] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2014] [Revised: 11/13/2014] [Accepted: 11/19/2014] [Indexed: 06/04/2023]
Abstract
The degradation of atrazine was investigated in aqueous solution by gamma-ray irradiation. 8.11 μM initial atrazine concentration could be completely removed in N₂ saturated solution by applying 3500 Gy radiation dose at a dose rate of 296 Gy h(-1). Significant removal of atrazine (i.e., 39.4%) was observed at an absorbed dose of 1184 Gy in air saturated solution and the removal efficiency was promoted to 50.5 and 65.4% in the presence of N₂O and N₂ gases, respectively. The relative contributions of hydrated electron, hydroxyl radical and hydrogen radical toward atrazine degradation were determined as ratio of observed dose constant (kobs) and found to be 5: 3: 1 for keaq(-): k·OH: kH·, respectively. The degradation efficiency of atrazine was 69.5, 55.6 and 37.3% at pH 12.1, 1.7 and 5.7, respectively. A degradation mechanism was proposed based on the identified degradation by-products by gas chromatography-mass spectrometry. Taking the relative contributions of oxidative and reductive species to atrazine degradation into account, reductive pathway proved to be a better approach for the radiolytic treatment of atrazine contaminated water.
Collapse
Affiliation(s)
- Javed Ali Khan
- Radiation Chemistry Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar 25120, Pakistan.
| | - Noor S Shah
- Radiation Chemistry Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar 25120, Pakistan; Institute of Chemical Sciences, University of Swat, Swat 19130, Pakistan
| | - Shah Nawaz
- Radiation Chemistry Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar 25120, Pakistan
| | - M Ismail
- Radiation Chemistry Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar 25120, Pakistan
| | - Faiza Rehman
- Radiation Chemistry Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar 25120, Pakistan
| | - Hasan M Khan
- Radiation Chemistry Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar 25120, Pakistan.
| |
Collapse
|