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Tungsten Trioxide and Its TiO2 Mixed Composites for the Photocatalytic Degradation of NOx and Bacteria (Escherichia coli) Inactivation. Catalysts 2022. [DOI: 10.3390/catal12080822] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
The increased air pollution and its impact on the environment and human health in several countries have caused global concerns. Nitrogen oxides (NO2 and NO) are principally emitted from industrial activities that strongly contribute to poor air quality. Among bacteria emanated from the fecal droppings of livestock, wildlife, and humans, Escherichia coli is the most abundant, and is often associated with the health risk of water. TiO2/WO3 heterostructures represent emerging systems for photocatalytic environmental remediation. However, the results reported in the literature are conflicting, depending on several parameters. In this work, WO3 and a series of TiO2/WO3 composites were properly synthesized by an easy and fast method, abundantly characterized by several techniques, and used for NOx degradation and E. coli inactivation under visible light irradiation. We demonstrated that the photoactivity of TiO2/WO3 composites towards NO2 degradation under visible light is strongly related to the WO3 content. The best performance was obtained by a WO3 load of 20% that guarantees limited e−/h+ recombination. On the contrary, we showed that E. coli could not be degraded under visible irradiation of the TiO2/WO3 composites.
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2
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Soto-Verjel J, Maturana AY, Villamizar SE. Advanced catalytic oxidation coupled to biological systems to treat pesticide-contaminated water: A review on technological trends and future challenges. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2022; 85:1263-1294. [PMID: 35228368 DOI: 10.2166/wst.2021.642] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
This article had the one and only objective of consolidating the couplings of advanced oxidation processes and biological systems in the decontamination of wastewater with pesticide content reported in the Scopus and Web of Science databases, through a critical analysis of which have been the most used, what methodologies have been implemented to develop them, identifying the objectives of each work, determining the success of the research and where the main niches of knowledge are, which can lead to the generation of new scientific knowledge as well as future trends. A co-occurrence analysis was carried out through the VOSViewer software to determine the most associated key words with the treatment configurations described above. Fenton and Photo-Fenton processes, heterogeneous photocatalysis TiO2/UV, electrocatalysis, ozonization and a particular case of hydrodynamic cavitation-ozone as main advanced oxidation processes, together with advanced biological processes such as sequential batch bioreactor (SBR), membrane bioreactor (MBR), mobile bed biofilm reactor (MBBR); biodegradability and toxicity tests with bacterial strains and surface wetlands, whose treatment philosophy is activated sludge. The main future trends are the reuse of treated wastewater, the analysis and control of costs towards the efficient use of resources and the primary study of the byproducts generated in advanced oxidation to improve the efficiencies in the coupling.
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Affiliation(s)
- Joseph Soto-Verjel
- Departamento de Ingeniería Civil y Ambiental - Instituto de Estudios Hidráulicos y Ambientales IDEHA, Universidad del Norte, Barranquilla, Colombia E-mail:
| | - Aymer Y Maturana
- Departamento de Ingeniería Civil y Ambiental - Instituto de Estudios Hidráulicos y Ambientales IDEHA, Universidad del Norte, Barranquilla, Colombia E-mail:
| | - Salvador E Villamizar
- Departamento de Ingeniería Civil y Ambiental - Instituto de Estudios Hidráulicos y Ambientales IDEHA, Universidad del Norte, Barranquilla, Colombia E-mail:
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3
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Ding H, Hu J. Degradation of carbamazepine by UVA/WO 3/hypochlorite process: Kinetic modelling, water matrix effects, and density functional theory calculations. ENVIRONMENTAL RESEARCH 2021; 201:111569. [PMID: 34186085 DOI: 10.1016/j.envres.2021.111569] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Revised: 06/15/2021] [Accepted: 06/18/2021] [Indexed: 06/13/2023]
Abstract
The rapid recombination of electron/hole pairs is a major setback in the application of WO3-based photocatalysis in water treatment. In this study, hypochlorite (ClO-) was used as an electron acceptor to enhance the photocatalytic degradation of carbamazepine (CBZ) using UVA-excited WO3. The results showed that CBZ degradation in the UVA/WO3/ClO- system followed a pseudo-first order reaction kinetic model. The addition of 0.1 mM ClO- to the UVA/WO3 system at pH values of 8.2 and 6.2 increased the rate constant (kobs) of the degradation process 5.3- and 11.5-fold, respectively. Further, increasing the WO3 dosage or decreasing the initial CBZ concentration resulted in an increase in kobs. However, at high concentrations, ClO- inhibited CBZ degradation. Based on the kinetic model, it could be suggested that ClO played a dominant role in the degradation process. Furthermore, the water matrix effects were as follows: the optimal pH was 6.2; humic acid, chloride, bicarbonate, and ammonium exhibited inhibitory effects on CBZ degradation; and sulfate ion significantly enhanced the degradation. Density functional theory (DFT) calculations indicated a strong affinity between ClO- and the WO3 surface. Specifically, the electrical energy per order that was associated with the use of ClO- varied in the range of 0.100-1.617 kWh/m3. In summary, this study shows that ClO- is an excellent electron acceptor for excited WO3, while clarifying the CBZ degradation-enhancing effect of ClO- as well as the kinetic model and DFT calculations. These findings can be employed in the degradation of recalcitrant contaminants in a cost-effective manner, while being significant for the development of more effective catalysts of UV-assisted advanced oxidation processes.
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Affiliation(s)
- Han Ding
- Department of Civil & Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, 117576, Singapore
| | - Jiangyong Hu
- Department of Civil & Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, 117576, Singapore.
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Liu X, Yu W, Li C, Zhang B, Yuan M, Ma Y. Impact of Unadorned Carbon Nitride on Photodegradation and Bioavailability of Multifungicides in the Environment. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:28-35. [PMID: 33356212 DOI: 10.1021/acs.jafc.0c03648] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Unadorned carbon nitride was synthesized via different nitrogen-rich precursors by thermal polymerization and applied to multifungicides for simultaneous photodegradation in the present study. Urea-derived carbon nitride (UCN) was verified to be most efficient in fungicide removal. The influences of catalyst dosage and pH were studied during the photodegradation process. Hydroxyl radical (•OH) and holes (h+) are the active species during photodegradation of each of the eight fungicides within an aqueous environment. The primary photodegradation products and pathways of all eight fungicides were systematically identified using liquid chromatography-tandem mass spectrometry (LC-MS/MS) analysis. In addition, the UCN catalyst was also applied to potted plants. The experimental results revealed that UCN could reduce fungicide residues in plants grown within a contaminated matrix. This study shows promising applications of the UCN catalyst in alleviating the hazards of pesticide residue.
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Affiliation(s)
- Xue Liu
- Institute of Tobacco Research, Chinese Academy of Agricultural Sciences, Qingdao 266101, P. R. China
| | - Weisong Yu
- Institute of Tobacco Research, Chinese Academy of Agricultural Sciences, Qingdao 266101, P. R. China
| | - Changsheng Li
- Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100193, P. R. China
| | - Bingjie Zhang
- Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100193, P. R. China
| | - Meng Yuan
- Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100193, P. R. China
| | - Yongqiang Ma
- Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100193, P. R. China
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Guo H, Jiang N, Wang H, Shang K, Lu N, Li J, Wu Y. Pulsed discharge plasma induced WO 3 catalysis for synergetic degradation of ciprofloxacin in water: Synergetic mechanism and degradation pathway. CHEMOSPHERE 2019; 230:190-200. [PMID: 31103865 DOI: 10.1016/j.chemosphere.2019.05.011] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 03/23/2019] [Accepted: 05/02/2019] [Indexed: 06/09/2023]
Abstract
Pulsed discharge plasma (PDP) was adopted to induce WO3 for synergetic degradation of ciprofloxacin (CIP) in water. WO3 was firstly characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), Photocurrents and Photoluminescence. The degradation results showed that PDP could induce WO3 photocatalysis successfully, and a synergetic effect was established in PDP/WO3 system. After 60 min treatment time, 0.16 g/L WO3 increased the CIP removal from 71.3% to 99.6%, with the enhancement of the first-order kinetic constant from 0.020 min-1 to 0.081 min-1. Then, the effect of peak voltage, air flow rate and pH on CIP removal was evaluated. Active species trapping test verified that ·OH and ·O2- played the major role for plasma-degradation of CIP degradation, whereas OH and h+ were conductive to catalytic degrade CIP. WO3 addition lead to the decline of O3 and enhancement of OH no matter in deionized water or CIP solution. The degradation process was explored using fluorescence spectrograph, liquid chromatography-mass spectrometry (LC-MS) and ion chromatography (IC). Finally, the possible degradation pathways of CIP degradation were proposed. The reuse test suggested WO3 possessed excellent catalytic performance as well as good stability.
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Affiliation(s)
- He Guo
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian University of Technology, Dalian, 116024, China; School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China
| | - Nan Jiang
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian University of Technology, Dalian, 116024, China; School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China; School of Electrical Engineering, Dalian University of Technology, Dalian, 116024, China.
| | - Huijuan Wang
- School of Environment and Safety Engineering, Jiangsu University, Zhenjiang, 212013, China
| | - Kefeng Shang
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian University of Technology, Dalian, 116024, China; School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China; School of Electrical Engineering, Dalian University of Technology, Dalian, 116024, China
| | - Na Lu
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian University of Technology, Dalian, 116024, China; School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China; School of Electrical Engineering, Dalian University of Technology, Dalian, 116024, China
| | - Jie Li
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian University of Technology, Dalian, 116024, China; School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China; School of Electrical Engineering, Dalian University of Technology, Dalian, 116024, China
| | - Yan Wu
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian University of Technology, Dalian, 116024, China; School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China; School of Electrical Engineering, Dalian University of Technology, Dalian, 116024, China
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Nguyen TT, Nam SN, Son J, Oh J. Tungsten Trioxide (WO 3)-assisted Photocatalytic Degradation of Amoxicillin by Simulated Solar Irradiation. Sci Rep 2019; 9:9349. [PMID: 31249354 PMCID: PMC6597549 DOI: 10.1038/s41598-019-45644-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Accepted: 06/12/2019] [Indexed: 11/23/2022] Open
Abstract
This study investigates the photocatalytic degradation of amoxicillin (AMO) by simulated solar irradiation using WO3 as a catalyst. A three-factor-three-level Box-Behnken design (BBD) consisting of 30 experimental runs is employed with three independent variables: initial AMO concentration, catalyst dosage, and pH. The experimental results are analyzed in terms of AMO degradation and mineralization, the latter of which is measured using dissolved organic carbon (DOC). The results show that the photocatalytic degradation of AMO follows pseudo-first-order kinetics. AMO degradation efficiency and the pseudo-first-order rate constants decrease with increasing initial AMO concentration and pH and increase with increasing catalyst dosage. Though AMO degradation is almost fully complete under the experimental conditions, DOC removal is much lower; the highest DOC removal rate is 35.82% after 180 min. Using these experimental results, second-order polynomial response surface models for AMO and DOC removal are constructed. In the AMO removal model, the first-order terms are the most significant contributors to the prediction, followed by the quadratic and interaction terms. Initial AMO concentration and pH have a significant negative impact on the photocatalytic degradation of AMO, while catalyst dosage has a significant positive impact. In contrast, in the DOC removal model, the quadratic terms make the most significant contribution to the prediction and the first-order terms the least. The optimal conditions for the photocatalytic degradation of AMO are found to be an initial AMO concentration of 1.0 μM, a catalyst dosage of 0.104 g/L, and a pH of 4, under which almost complete removal of AMO is achieved (99.99%).
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Affiliation(s)
- Thao Thi Nguyen
- Department of Civil and Environmental Engineering, Chung-Ang University, 84, Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Seong-Nam Nam
- Department of Civil and Environmental Engineering, Chung-Ang University, 84, Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea.
| | - Jooyoung Son
- Department of Civil and Environmental Engineering, Chung-Ang University, 84, Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Jeill Oh
- Department of Civil and Environmental Engineering, Chung-Ang University, 84, Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
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7
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Exploring a broadened operating pH range for norfloxacin removal via simulated solar-light-mediated Bi2WO6 process. CHINESE JOURNAL OF CATALYSIS 2019. [DOI: 10.1016/s1872-2067(19)63285-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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8
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Simon G, Gyulavári T, Hernádi K, Molnár M, Pap Z, Veréb G, Schrantz K, Náfrádi M, Alapi T. Photocatalytic ozonation of monuron over suspended and immobilized TiO2–study of transformation, mineralization and economic feasibility. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.01.025] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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9
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Cruz-González G, Julcour C, Chaumat H, Bourdon V, Ramon-Portugal F, Gaspard S, Jáuregui-Haza UJ, Delmas H. Degradation of chlordecone and beta-hexachlorocyclohexane by photolysis, (photo-)fenton oxidation and ozonation. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART. B, PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES 2018; 53:121-125. [PMID: 29148925 DOI: 10.1080/03601234.2017.1388682] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Intensive use of chlorinated pesticides from the 1960s to the 1990s has resulted in a diffuse contamination of soils and surface waters in the banana-producing areas of the French West Indies. The purpose of this research was, for the first time, to examine the degradation of two of these persistent pollutants - chlordecone (CLD) and beta-hexachlorocyclohexane (β-HCH) in 1 mg L-1 synthetic aqueous solutions by means of photolysis, (photo-) Fenton oxidation and ozonation processes. Fenton oxidation is not efficient for CLD and yields less than 15% reduction of β-HCH concentration in 5 h. Conversely, both molecules can be quantitatively converted under UV-Vis irradiation reaching 100% of degradation in 5 h, while combination with hydrogen peroxide and ferrous iron does not show any significant improvement except in high wavelength range (>280 nm). Ozonation exhibits comparable but lower degradation rates than UV processes. Preliminary identification of degradation products indicated that hydrochlordecone was formed during photo-Fenton oxidation of CLD, while for β-HCH the major product peak exhibited C3H3Cl2 as most abundant fragment.
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Affiliation(s)
- Germán Cruz-González
- a Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS , Toulouse , France
- b Instituto Superior de Tecnologías y Ciencias Aplicadas (InSTEC)- Universidad de La Habana , Avenida Salvador Allende No 1110 entre Infanta y Avenida Rancho Boyeros, Quinta de los Molinos, A.P. 6163, La Habana , Cuba
| | - Carine Julcour
- a Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS , Toulouse , France
| | - Hélène Chaumat
- a Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS , Toulouse , France
| | - Valérie Bourdon
- c Service Commun de Spectrométrie de Masse, Université Paul Sabatier , Porte 157, Bâtiment 2R1, 118, route de Narbonne, Toulouse Cedex 09 , France
| | - Felipe Ramon-Portugal
- d UMR CNRS/UPS/ENFA 5174 "Evolution et Diversité Biologique", École National de Formation Agronomique , 2, Route de Narbonne, BP 22687, Auzeville Tolosane, Castanet Cedex , France
| | - Sarra Gaspard
- e Laboratoire COVACHIM M2E, EA 3592, Université des Antilles et de la Guyane , BP 250, Pointe à Pitre Cedex , Guadeloupe
| | - Ulises J Jáuregui-Haza
- b Instituto Superior de Tecnologías y Ciencias Aplicadas (InSTEC)- Universidad de La Habana , Avenida Salvador Allende No 1110 entre Infanta y Avenida Rancho Boyeros, Quinta de los Molinos, A.P. 6163, La Habana , Cuba
| | - Henri Delmas
- a Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS , Toulouse , France
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Wu Y, Chen C, Huang Y, Lin W, Yen Y, Lu C. Pirimicarb degradation by BiVO4 photocatalysis: Parameter and reaction pathway investigations. SEP SCI TECHNOL 2016. [DOI: 10.1080/01496395.2016.1202279] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Yushen Wu
- Department of Environmental Engineering, HungKuang University, Sha-Lu, Taichung, Taiwan, Republic of China
| | - Chiingchang Chen
- Department of Science Application and Dissemination, National Taichung University of Education, Taichung, Taiwan, Republic of China
| | - Yanchi Huang
- Department of Environmental Engineering, HungKuang University, Sha-Lu, Taichung, Taiwan, Republic of China
| | - Weiyu Lin
- Department of Environmental Engineering, HungKuang University, Sha-Lu, Taichung, Taiwan, Republic of China
| | - Yunting Yen
- Department of Chemistry, Chung Yuan Christian University, Chung-Li, Taiwan, Republic of China
| | - Chungshin Lu
- Department of General Education, National Taichung University of Science and Technology, Taichung, Taiwan, Republic of China
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Kovács K, He S, Míle V, Földes T, Pápai I, Takács E, Wojnárovits L. Ionizing radiation induced degradation of monuron in dilute aqueous solution. Radiat Phys Chem Oxf Engl 1993 2016. [DOI: 10.1016/j.radphyschem.2015.10.028] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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12
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Kovács K, Farkas J, Veréb G, Arany E, Simon G, Schrantz K, Dombi A, Hernádi K, Alapi T. Comparison of various advanced oxidation processes for the degradation of phenylurea herbicides. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART. B, PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES 2016; 51:205-214. [PMID: 26764571 DOI: 10.1080/03601234.2015.1120597] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Various types of advanced oxidation processes (AOPs), such as UV photolysis, ozonation, heterogeneous photocatalysis and their combinations were comparatively examined at the same energy input in a home-made reactor. The oxidative transformations of the phenylurea herbicides fenuron, monuron and diuron were investigated. The initial rates of transformation demonstrated that UV photolysis was highly efficient in the cases of diuron and monuron. Ozonation proved to be much more effective in the transformation of fenuron than in those of the chlorine containing monuron and diuron. In heterogeneous photocatalysis, the rate of decomposition decreased with increase of the number of chlorine atoms in the target molecule. Addition of ozone to UV-irradiated solutions and/or TiO2-containing suspensions markedly increased the initial rates of degradation. Dehalogenation of monuron and diuron showed that each of these procedures is suitable for the simultaneous removal of chlorinated pesticides and their chlorinated intermediates. Heterogeneous photocatalysis was found to be effective in the mineralization.
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Affiliation(s)
- Krisztina Kovács
- a Research Group of Environmental Chemistry, University of Szeged , Szeged , Hungary
- b Institute of Isotopes, Centre for Energy Research, Hungarian Academy of Sciences , Budapest , Hungary
| | - János Farkas
- a Research Group of Environmental Chemistry, University of Szeged , Szeged , Hungary
| | - Gábor Veréb
- a Research Group of Environmental Chemistry, University of Szeged , Szeged , Hungary
| | - Eszter Arany
- a Research Group of Environmental Chemistry, University of Szeged , Szeged , Hungary
| | - Gergő Simon
- a Research Group of Environmental Chemistry, University of Szeged , Szeged , Hungary
| | - Krisztina Schrantz
- a Research Group of Environmental Chemistry, University of Szeged , Szeged , Hungary
- c Department of Inorganic and Analytical Chemistry , University of Szeged , Szeged , Hungary
| | - András Dombi
- a Research Group of Environmental Chemistry, University of Szeged , Szeged , Hungary
| | - Klára Hernádi
- a Research Group of Environmental Chemistry, University of Szeged , Szeged , Hungary
- d Department of Applied and Environmental Chemistry , University of Szeged , Szeged , Hungary
| | - Tünde Alapi
- a Research Group of Environmental Chemistry, University of Szeged , Szeged , Hungary
- c Department of Inorganic and Analytical Chemistry , University of Szeged , Szeged , Hungary
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Kim J, Moon GH, Kim S, Kim J. Photocatalytic oxidation mechanism of arsenite on tungsten trioxide under visible light. J Photochem Photobiol A Chem 2015. [DOI: 10.1016/j.jphotochem.2015.06.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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14
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Visa M, Bogatu C, Duta A. Tungsten oxide--fly ash oxide composites in adsorption and photocatalysis. JOURNAL OF HAZARDOUS MATERIALS 2015; 289:244-256. [PMID: 25733398 DOI: 10.1016/j.jhazmat.2015.01.053] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2014] [Revised: 01/12/2015] [Accepted: 01/22/2015] [Indexed: 05/26/2023]
Abstract
A novel composite based on tungsten oxide and fly ash was hydrothermally synthetized to be used as substrate in the advanced treatment of wastewaters with complex load resulted from the textile industry. The proposed treatment consists of one single step process combining photocatalysis and adsorption. The composite's crystalline structure was investigated by X-ray diffraction and FTIR, while atomic force microscopy (AFM) and scanning electron microscopy (SEM) were used to analyze the morphology. The adsorption capacity and photocatalytic properties of the material were tested on mono- and multi-pollutants systems containing two dyes (Bemacid Blau - BB and Bemacid Rot - BR) and one heavy metal ion-Cu(2+), and the optimized process conditions were identified. The results indicate better removal efficiencies using the novel composite material in the combined adsorption and photocatalysis, as compared to the separated processes. Dyes removal was significantly enhanced in the photocatalytic process by adding hydrogen peroxide and the mechanism was presented and discussed. The pseudo second order kinetics model best fitted the experimental data, both in the adsorption and in the combined processes. The kinetic parameters were calculated and correlated with the properties of the composite substrate.
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Affiliation(s)
- Maria Visa
- Transilvania University of Brasov, Deptartment of Renewable Energy Systems and Recycling, Eroilor 29, 500036 Brasov, Romania.
| | - Cristina Bogatu
- Transilvania University of Brasov, Deptartment of Renewable Energy Systems and Recycling, Eroilor 29, 500036 Brasov, Romania.
| | - Anca Duta
- Transilvania University of Brasov, Deptartment of Renewable Energy Systems and Recycling, Eroilor 29, 500036 Brasov, Romania.
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Reddy PVL, Kim KH. A review of photochemical approaches for the treatment of a wide range of pesticides. JOURNAL OF HAZARDOUS MATERIALS 2015; 285:325-335. [PMID: 25528231 DOI: 10.1016/j.jhazmat.2014.11.036] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Revised: 11/04/2014] [Accepted: 11/26/2014] [Indexed: 06/04/2023]
Abstract
Pesticides are renowned as some of the most pernicious chemicals known to humankind. Nine out of twelve most hazardous and persistent organic chemicals on planet have been identified as pesticides and their derivatives. Because of their strong recalcitrant nature, it often becomes a difficult task to treat them by conventional approaches. It is well perceived that many factors can interfere with the degradation of pesticides under ambient conditions, e.g., media, light intensity, humic content, and other biological components. However, for the effective treatment of pesticides, photochemical methods are viewed as having clear and perceivable advantages. In this article, we provide a review of the fundamental characteristics of photochemical approaches for pesticide treatment and the factors governing their capacity and potential in such a process.
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Affiliation(s)
- P Venkata Laxma Reddy
- Environmental Science and Engineering, University of Texas Elpaso, Elpaso, TX 79902, USA; Indian Institute of Chemical Technology, Tarnaka, Hyderabad, Andhra Pradesh 50003, India
| | - Ki-Hyun Kim
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seongdong-gu, Seoul 133-791, South Korea.
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16
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Dong S, Yu C, Li Y, Li Y, Sun J, Geng X. Controlled synthesis of T-shaped BiVO4 and enhanced visible light responsive photocatalytic activity. J SOLID STATE CHEM 2014. [DOI: 10.1016/j.jssc.2013.12.027] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Fenoll J, Sabater P, Navarro G, Pérez-Lucas G, Navarro S. Photocatalytic transformation of sixteen substituted phenylurea herbicides in aqueous semiconductor suspensions: intermediates and degradation pathways. JOURNAL OF HAZARDOUS MATERIALS 2013; 244-245:370-379. [PMID: 23270960 DOI: 10.1016/j.jhazmat.2012.11.055] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2012] [Revised: 11/21/2012] [Accepted: 11/23/2012] [Indexed: 06/01/2023]
Abstract
The photocatalytic degradation of sixteen substituted phenylurea herbicides (PUHs) in pure water has been studied using zinc oxide (ZnO) and titanium dioxide (TiO(2)) as photocatalyst under artificial light irradiation. Photocatalytic experiments showed that the addition of these chalcogenide oxides in tandem with the oxidant (Na(2)S(2)O(8)) strongly enhances the degradation rate of these compounds in comparison with those carried out with ZnO and TiO(2) alone and photolytic tests. Comparison of catalysts showed that ZnO is the most efficient for the removal of such herbicides in optimal conditions and at constant volumetric rate of photon absorption in the photoreactor. Thus, the complete disappearance of all the studied compounds was achieved after 20 min of illumination in the ZnO/Na(2)S(2)O(8) system. The main photocatalytic intermediates detected during the degradation of PUHs were identified. The probable photodegradation pathways were proposed and discussed. The main steps involved: N-demethylation of the N,N-dimethylurea-substituted compounds followed of N-demethylation and N-demethoxylation of the N-methoxy-N-methyl-substituted ureas and hydroxylation of aromatic rings and their aliphatic side-chains of both, parent compounds and intermediates.
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Affiliation(s)
- José Fenoll
- Departamento de Calidad y Garantía Alimentaria, Instituto Murciano de Investigación y Desarrollo Agrario y Alimentario (IMIDA), C/Mayor s/n, La Alberca, 30150 Murcia, Spain.
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