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Homogeneous Photo-Fenton Degradation and Mineralization of Model and Simulated Pesticide Wastewaters in Lab- and Pilot-Scale Reactors. Catalysts 2022. [DOI: 10.3390/catal12121512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
Abstract
The homogeneous photocatalytic degradation of model pesticide clopyralid (CLPR) has been investigated under various experimental setups. Lab-scale experiments under UV-A radiation in an acidic environment showed that the degradation rate generally increased when increasing either Fe3+ or H2O2 concentration up to a point beyond which (i.e., 100 mg L−1 for peroxide or 7 mg L−1 for ferric ions) Fenton reagents had little or even detrimental effect on degradation. Thus, there is an optimum concentration of Fenton reagents for maximizing treatment performance, beyond which degradation rates are not enhanced. Excessive concentrations of peroxide and/or catalyst may (i) introduce unnecessary treatment costs, (ii) reduce performance due to scavenging effects, and (iii) raise environmental concerns associated with the disposal of, e.g., high concentrations of iron in the receiving water courses. Switching from UV-A to visible light led to similar rates of degradation, i.e., 86% and 82.2%, respectively, after 90 min of reaction, highlighting the potential of using renewable energy, i.e., natural sunlight, to drive the process. Treatment for 120 min also led to 90% mineralization and quantitative release of nitrogen originally present in the pesticide; this was also accompanied by complete elimination of eco-toxicity to Vibrio fischeri. Pilot-scale experiments were performed in a fountain-type reactor using a commercial pesticide formulation containing CLPR. Both the degradation and mineralization rates increased with increasing the intensity of the incident UV-A radiation from 1.88 to 4.03 mW cm−2. Experiments were also conducted with different liquid volumes, i.e., from 3 to 8 L. Illumination of 5 L wastewater resulted in 80% mineralization after 60 min and this only slightly decreased to 73% at 8 L. Overall, the findings underline the promising perspectives of the application of the treatment method in upgrading the quality of water and liquid waste containing pesticides.
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Theoretical studies on the mechanism, kinetics, and degradation pathways of auxin mimic herbicides by •OH radical in aqueous media. Struct Chem 2022. [DOI: 10.1007/s11224-022-02055-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Cao Q, Meng F, Song B, Bai Z, Zhao Y, Chen D, Zhou Y, Song M. A Fenton-like system of biochar loading Fe-Al layered double hydroxides (FeAl-LDH@BC) / H 2O 2 for phenol removal. CHEMOSPHERE 2021; 266:128992. [PMID: 33303228 DOI: 10.1016/j.chemosphere.2020.128992] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Revised: 10/29/2020] [Accepted: 11/13/2020] [Indexed: 06/12/2023]
Abstract
FeAl-layered double hydroxide (FeAl-LDH) supported by char was synthesized using the hydrothermal method in order to activate hydrogen peroxide (H2O2) to degrade phenol. The effects of char type, char synthesis amount, and several important parameters on the degradation were investigated. In addition, the physicochemical properties of FeAl-LDH@BC were revealed by instruments including the transmission electron microscope (TEM), X-ray diffraction (XRD), and Fourier-transform infrared (FT-IR). The results showed that the degradation efficiency of phenol (80 mg/L) by FeAl-LDH@BC0.25 was 85.28% at a pH of 3 and H2O2 concentration of 400 mg/L, and exhibited good reusability with a small amount of iron leaching. Electron paramagnetic resonance (EPR) and radical quenching results indicated that ·OH radicals were the main participant during the degradation process, and XRD and FTIR spectra showed that FeAl-LDH was dissolved and rebuilt during the degradation process, and a small amount of iron was leached out resulting in the homogeneous catalysis. Hence, both homogeneous and heterogeneous processes occurred in the phenol oxidation process. Further soil remediation experiments showed that FeAl-LDH@BC0.25 could also effectively degrade phenol in soil, although the efficiency was lower than that in solution.
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Affiliation(s)
- Qingqing Cao
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China
| | - Fanyue Meng
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China
| | - Bing Song
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China
| | - Zhongqiang Bai
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China
| | - Yan Zhao
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China
| | - Dandan Chen
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China; Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210042, China
| | - Yan Zhou
- Nanjing Institute of Environmental Science, Ministry of Ecology and Environment, Nanjing, 210042, China.
| | - Min Song
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China.
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SUN H, YAO* Y, WEI F, ZHAO Q, LIU B, ZHANG L. Process optimization and mechanism study of acid red G degradation by electro-Fenton-Feox process as an in situ generation of H 2O 2. Turk J Chem 2021; 45:5-16. [PMID: 33679147 PMCID: PMC7925314 DOI: 10.3906/kim-2002-10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Accepted: 09/17/2020] [Indexed: 11/22/2022] Open
Abstract
Dye-contaminated wastewaters are industrial wastewaters that are difficult to treat using traditional biochemical and physicochemical methods. In the present work, the acid red G was removed as a model pollutant by the electro-Fenton process for the first time. The anode and cathode used by the electro-Fenton process were iron plate and graphite felt, respectively. It was concluded that under the optimal conditions of current density = 20 mA cm-2, pH = 3 and initial Na2SO4 concentration = 0.2 M, the removal rate of acid red G (ARG) with an initial concentration of 300 mg L-1 could reach 94.05% after 80 min of electrolysis. This reveals that the electro-Fenton-Feox process used in this work has an excellent removal efficiency on acid red G. The required reagents (Fe2+ and H2O2) were generated by the electrode reaction, while the optimal generation conditions and mechanism of •OH, H2O2, and Fe2+ were investigated. By testing •OH, H2O2, and Fe2+ agents at different pH and current densities, it was revealed that the electro-Fenton reaction was most efficient when the current density was 20 mA cm-2, and the pH was 3. Moreover, the removal rate of ARG is consistent with first-order reaction kinetics.
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Affiliation(s)
- Hailong SUN
- Hebei University of Technology, School of Chemical Engineering and Technology, TianjinP.R. China
| | - Yingwu YAO*
- Hebei University of Technology, School of Chemical Engineering and Technology, TianjinP.R. China
| | - Feng WEI
- Hebei University of Technology, School of Chemical Engineering and Technology, TianjinP.R. China
| | - Qiang ZHAO
- Hebei University of Technology, School of Chemical Engineering and Technology, TianjinP.R. China
| | - Baichen LIU
- Hebei University of Technology, School of Chemical Engineering and Technology, TianjinP.R. China
| | - Liman ZHANG
- Hebei University of Technology, School of Chemical Engineering and Technology, TianjinP.R. China
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Santos GDO, Eguiluz KI, Salazar-Banda GR, Saez C, Rodrigo MA. Testing the role of electrode materials on the electro-Fenton and photoelectro-Fenton degradation of clopyralid. J Electroanal Chem (Lausanne) 2020. [DOI: 10.1016/j.jelechem.2020.114291] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Millán M, Bucio-Rodríguez PY, Lobato J, Fernández-Marchante CM, Roa-Morales G, Barrera-Díaz C, Rodrigo MA. Strategies for powering electrokinetic soil remediation: A way to optimize performance of the environmental technology. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 267:110665. [PMID: 32421682 DOI: 10.1016/j.jenvman.2020.110665] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2020] [Revised: 04/26/2020] [Accepted: 04/26/2020] [Indexed: 06/11/2023]
Abstract
The electro-kinetic remediation of soils using different powering strategies has been studied, in order to clarify which is the best strategy to couple solar powering with this remediation technology, in a context of developing more sustainable electrochemical remediation technologies. Direct powering from photovoltaic panels (Case a), application of constant electric fields with the same average value of Case a (Case b) and application of constant specific power with the same average value of Case a (Case c) have been compared. Results show an outstanding influence of the powering strategy on the removal efficiency of clopyralid (model of herbicide used in this work). The direct use of solar power profiles obtained the lowest removal efficiencies, which contrasts with the higher expected sustainability of this powering strategy. Reversion of pollutant transport overnight and extreme electric field values at noon help to explain the lower efficiency of this strategy. Evaporation mechanisms are promoted by operating at extreme large electric fields. In addition, harsher conditions lead to a higher negative soil affectation in terms of regions affected by extreme pHs, water contents and/or conductivities and to lower specific pollutant removals. Therefore, maximum efficiencies were found for Case b (constant electric potential gradient) with a total removal over 110 g kWh-1 and only a slight affectation into the final soil properties.
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Affiliation(s)
- M Millán
- Department of Chemical Engineering, Faculty of Chemical Sciences & Technologies, University of Castilla-La Mancha, Av. Camilo Jose Cela n 12, 13071, Ciudad Real, Spain
| | - P Y Bucio-Rodríguez
- Autonomous University of the State of Mexico, Joint Center for Research in Sustainable Chemistry (CCIQS UAEM-UNAM), Carretera Toluca-Atlacomulco km 14.5, Campus UAEMéx "El Rosedal", Toluca, State of Mexico, 50200, Mexico
| | - J Lobato
- Department of Chemical Engineering, Faculty of Chemical Sciences & Technologies, University of Castilla-La Mancha, Av. Camilo Jose Cela n 12, 13071, Ciudad Real, Spain
| | - C M Fernández-Marchante
- Department of Chemical Engineering, Faculty of Chemical Sciences & Technologies, University of Castilla-La Mancha, Av. Camilo Jose Cela n 12, 13071, Ciudad Real, Spain
| | - G Roa-Morales
- Autonomous University of the State of Mexico, Joint Center for Research in Sustainable Chemistry (CCIQS UAEM-UNAM), Carretera Toluca-Atlacomulco km 14.5, Campus UAEMéx "El Rosedal", Toluca, State of Mexico, 50200, Mexico
| | - C Barrera-Díaz
- Autonomous University of the State of Mexico, Joint Center for Research in Sustainable Chemistry (CCIQS UAEM-UNAM), Carretera Toluca-Atlacomulco km 14.5, Campus UAEMéx "El Rosedal", Toluca, State of Mexico, 50200, Mexico
| | - M A Rodrigo
- Department of Chemical Engineering, Faculty of Chemical Sciences & Technologies, University of Castilla-La Mancha, Av. Camilo Jose Cela n 12, 13071, Ciudad Real, Spain.
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Barbosa Ferreira M, Souza FL, Muñoz-Morales M, Sáez C, Cañizares P, Martínez-Huitle CA, Rodrigo MA. Clopyralid degradation by AOPs enhanced with zero valent iron. JOURNAL OF HAZARDOUS MATERIALS 2020; 392:122282. [PMID: 32105951 DOI: 10.1016/j.jhazmat.2020.122282] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 01/22/2020] [Accepted: 02/10/2020] [Indexed: 06/10/2023]
Abstract
Four different technologies have been compared (photolysis, ZVI + photolysis, electrolysis and ZVI + electrolysis) regarding the: (1) degradation of clopyralid, (2) extent of its mineralization, (3) formation of by-products and main reaction pathways. Results show that photolysis is the less efficient treatment and it only attains 5 % removal of the pollutant, much less than ZVI, which reaches 45 % removal and that electrolysis, which attains complete removal and 78 % mineralization within 4 h. When ZVI is used as pre-treatment of electrolysis, it was obtained the most efficient technology. The identification of transformation products was carried out for each treatment by LCMS. In total, ten products were identified. Tentative pathways for preferential clopyralid degradation for all processes were proposed. This work draws attention of the synergisms caused by the coupling of techniques involving the treatment of chlorinated compound and sheds light on how the preferential mechanisms of each treatment evaluated occurred.
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Affiliation(s)
- M Barbosa Ferreira
- Institute of Chemistry, Federal University of Rio Grande do Norte, Campus Universitario 3000, 59078-970 Natal, RN, Brazil
| | - F L Souza
- Department of Chemical Engineering, Faculty of Chemical Sciences and Technologies, University of Castilla-La Mancha, Campus Universitario s/n, 13071 Ciudad Real, Spain
| | - M Muñoz-Morales
- Department of Chemical Engineering, Faculty of Chemical Sciences and Technologies, University of Castilla-La Mancha, Campus Universitario s/n, 13071 Ciudad Real, Spain
| | - C Sáez
- Department of Chemical Engineering, Faculty of Chemical Sciences and Technologies, University of Castilla-La Mancha, Campus Universitario s/n, 13071 Ciudad Real, Spain
| | - P Cañizares
- Department of Chemical Engineering, Faculty of Chemical Sciences and Technologies, University of Castilla-La Mancha, Campus Universitario s/n, 13071 Ciudad Real, Spain
| | - C A Martínez-Huitle
- Institute of Chemistry, Federal University of Rio Grande do Norte, Campus Universitario 3000, 59078-970 Natal, RN, Brazil
| | - M A Rodrigo
- Department of Chemical Engineering, Faculty of Chemical Sciences and Technologies, University of Castilla-La Mancha, Campus Universitario s/n, 13071 Ciudad Real, Spain.
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Liu F, Oturan N, Zhang H, Oturan MA. Soil washing in combination with electrochemical advanced oxidation for the remediation of synthetic soil heavily contaminated with diesel. CHEMOSPHERE 2020; 249:126176. [PMID: 32087453 DOI: 10.1016/j.chemosphere.2020.126176] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 02/01/2020] [Accepted: 02/09/2020] [Indexed: 06/10/2023]
Abstract
Sequential soil washing and electrochemical advanced oxidation processes (EAOPs) were applied for the remediation of synthetic soil contaminated with diesel. The surfactant Tween 80 was used to enhance the extraction of diesel from synthetic soil, and diesel extraction efficiency was improved with the increase of Tween 80 concentration. Under conditions of 180 min washing time, 10 g synthetic soil with 100 mL surfactant solution and two times of soil washing, about 75.2%, 80.0% and 87.9% of diesel was extracted from synthetic soil with 5.0, 7.5 and 10.0 g L-1 Tween 80. The degradation of diesel in soil washing effluent was carried out by two EAOPs, electro-oxidation (EO) and electro-Fenton (EF) using boron-doped diamond (BDD) anode and carbon felt cathode cell. After 360 min EO treatment, 72.7-83.0% of diesel was removed from the effluent after soil washing with 5.0-10.0 g L-1 Tween 80 while higher removal efficiencies (77.7-87.2%) were attained with EF process. Parallel factor analysis (PARAFAC) of excitation emission matrix (EEM) fluorescence spectroscopy was conducted to analysis the transformation of fluorescent components in diesel during the treatment by two EAOPs.
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Affiliation(s)
- Fuzhen Liu
- Department of Environmental Science and Engineering, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan, 430079, China; Laboratoire Géomatériaux et Environnement (EA 4508), Université Paris-Est, UPEM, 5 Bd. Descartes, 77454, Marne-la-Vallée Cedex 2, France
| | - Nihal Oturan
- Laboratoire Géomatériaux et Environnement (EA 4508), Université Paris-Est, UPEM, 5 Bd. Descartes, 77454, Marne-la-Vallée Cedex 2, France
| | - Hui Zhang
- Department of Environmental Science and Engineering, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan, 430079, China.
| | - Mehmet A Oturan
- Laboratoire Géomatériaux et Environnement (EA 4508), Université Paris-Est, UPEM, 5 Bd. Descartes, 77454, Marne-la-Vallée Cedex 2, France.
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