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Rezgui S, Díez AM, Monser L, Adhoum N, Pazos M, Sanromán MA. ZnFe 2O 4-chitosan magnetic beads for the removal of chlordimeform by photo-Fenton process under UVC irradiation. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 283:111987. [PMID: 33516095 DOI: 10.1016/j.jenvman.2021.111987] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Revised: 12/05/2020] [Accepted: 01/10/2021] [Indexed: 06/12/2023]
Abstract
A simple protocol was proposed for the preparation of magnetic chitosan beads ZnFe2O4-CS via a co-precipitation method. The use of synthesized magnetic ZnFe2O4-CS beads as catalyst for the heterogeneous photo-Fenton treatment of chlordimeform insecticide (CDM) was evaluated. The photo-Fenton experiments were carried out with different synthesized catalysts by varying the molar ratio Zn/Fe in chitosan beads, the catalyst concentration and pH. Under optimal conditions using 1 g of ZnFe2O4-CS beads with a molar ratio Zn/Fe = 0.35 and at pHinitial = 3, a real wastewater doped with 20 mg L-1 of CDM was treated and complete removal of the insecticide was achieved after 7 min with a total TOC removal after 2 h of treatment. The generated carboxylic acids and ions during the photo-Fenton process were identified and quantified. The stability of the photocatalytic activity of the best catalyst in terms of pollutant removal, ZnFe2O4-CS(0.35) beads with a molar ratio Zn/Fe equal to 0.35, was satisfactory validated by four consecutive cycles. This optimal catalyst was characterized, before and after use, by Scanning Electron Microscopy/Energy Dispersive X-Ray Spectroscopy, X-Ray Powder Diffraction and Vibrating Sample Magnetometry analysis.
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Affiliation(s)
- Soumaya Rezgui
- BIOSUV Research Group, INTECX building, Universidade de Vigo, Campus AsLagoas - Marcosende, 36310, Vigo, Spain; Unité de recherche en Electrochimie, Matériaux et Environnement (UR16ES02), IPEIK, Université de Kairouan, Tunisia; Institut National des Sciences Appliquées et de Technologie, B.P. N° 676, 1080, Tunis Cedex, Tunisia.
| | - Aida M Díez
- BIOSUV Research Group, INTECX building, Universidade de Vigo, Campus AsLagoas - Marcosende, 36310, Vigo, Spain
| | - Lotfi Monser
- Unité de recherche en Electrochimie, Matériaux et Environnement (UR16ES02), IPEIK, Université de Kairouan, Tunisia; Institut National des Sciences Appliquées et de Technologie, B.P. N° 676, 1080, Tunis Cedex, Tunisia
| | - Nafaa Adhoum
- Unité de recherche en Electrochimie, Matériaux et Environnement (UR16ES02), IPEIK, Université de Kairouan, Tunisia
| | - Marta Pazos
- BIOSUV Research Group, INTECX building, Universidade de Vigo, Campus AsLagoas - Marcosende, 36310, Vigo, Spain
| | - M Angeles Sanromán
- BIOSUV Research Group, INTECX building, Universidade de Vigo, Campus AsLagoas - Marcosende, 36310, Vigo, Spain
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Hu J, Li Y, Nan S, Yoza BA, Li Y, Zhan Y, Wang Q, Li QX, Guo S, Chen C. Catalytic Ozonation of Nitrobenzene by Manganese-Based Y Zeolites. Front Chem 2020; 8:80. [PMID: 32117897 PMCID: PMC7028746 DOI: 10.3389/fchem.2020.00080] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Accepted: 01/24/2020] [Indexed: 11/21/2022] Open
Abstract
Catalytic ozonation process (COP) is considered as a cost-efficient technology for the treatment of refractory chemical wastewaters. The catalyst performance plays an important role for the treatment efficiency. The present study investigated efficiencies and mechanisms of manganese (Mn)-based Y zeolites in COPs for removing nitrobenzene from water. The catalysts of Mn/NaY and Mn/USY were prepared by incipient wetness impregnation, while Mn-USY was obtained by hydrothermal synthesis. Mn-USY contained a greater ratio of Mn2+ than Mn/NaY, and Mn/USY. Mn oxides loaded on Y zeolites promoted the COP efficiencies. Mn/NaY increased total organic carbon removal in COP by 7.3% compared to NaY, while Mn/USY and Mn-USY increased 11.5 and 15.8%, respectively, relative to USY in COP. Multivalent Mn oxides (Mn2+, Mn3+, and Mn4+) were highly dispersed on the surface of NaY or USY, and function as catalytic active sites, increasing mineralization. Mn-USY showed the highest total organic carbon removal (44.3%) in COP among the three catalysts, because Mn-USY had a higher ratio of Mn2+ to the total Mn oxides on the surface than Mn/NaY and Mn/USY and the catalytic effects from intercorrelations between Mn oxides and mesoporous surface structures. The hydroxyl radicals and superoxide radicals governed oxidations in COP using Mn-USY. Nitrobenzene was oxidized to polyhydroxy phenol, polyhydroxy nitrophenol, and p-benzoquinone. The intermediates were then oxidized to small organic acids and ultimately carbon dioxide and water. This study demonstrates the potential of Y zeolites used in COP for the treatment of refractory chemical wastewaters.
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Affiliation(s)
- Jingze Hu
- State Key Laboratory of Petroleum Pollution Control, China University of Petroleum-Beijing, Beijing, China
| | - Yiming Li
- State Key Laboratory of Petroleum Pollution Control, China University of Petroleum-Beijing, Beijing, China
| | - Shaoshuai Nan
- State Key Laboratory of Petroleum Pollution Control, China University of Petroleum-Beijing, Beijing, China
| | - Brandon A Yoza
- Hawaii Natural Energy Institute, University of Hawaii at Manoa, Honolulu, HI, United States
| | - Yifan Li
- State Key Laboratory of Petroleum Pollution Control, China University of Petroleum-Beijing, Beijing, China
| | - Yali Zhan
- State Key Laboratory of Petroleum Pollution Control, China University of Petroleum-Beijing, Beijing, China
| | - Qinghong Wang
- State Key Laboratory of Petroleum Pollution Control, China University of Petroleum-Beijing, Beijing, China
| | - Qing X Li
- Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, Honolulu, HI, United States
| | - Shaohui Guo
- State Key Laboratory of Petroleum Pollution Control, China University of Petroleum-Beijing, Beijing, China
| | - Chunmao Chen
- State Key Laboratory of Petroleum Pollution Control, China University of Petroleum-Beijing, Beijing, China
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Stoerzinger KA, Pearce CI, Droubay TC, Shutthanandan V, Liu Z, Arenholz E, Rosso KM. Structure, Magnetism, and the Interaction of Water with Ti-Doped Fe 3O 4 Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:13872-13879. [PMID: 31589056 DOI: 10.1021/acs.langmuir.9b02468] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The functionality of magnetite, Fe3O4, for catalysis and spintronics applications is dependent on the molar ratio of Fe2+ and Fe3+ and their distribution at the surface. In turn, this depends on a poorly understood interplay between crystallographic orientation, dopants, and the reactive adsorption of atmospheric species such as water. Here, (100)-, (110)-, and (111)-oriented films of titano-magnetite, Fe(3-x)TixO4, were grown by pulsed laser deposition and their composition, valence distribution, magnetism, and interaction with water were studied by ambient pressure X-ray photoelectron spectroscopy (AP-XPS) and X-ray magnetic circular dichroism. Although the bulk compositions match the desired stoichiometry, the surfaces were found to be enriched in Ti4+, especially the top 1 nm. The highest surface energy (110) film was the most reduced, tied to local Ti enrichment, and a corresponding decreased magnetic moment. AP-XPS showed that incorporation of x = 0.25 Ti dramatically lowered the propensity to form hydroxyl species at a given relative humidity, and also that hydroxylation is relatively invariant with orientation. In contrast, the affinity for water is similar across orientations, regardless of Ti incorporation, suggesting that relative humidity controls its uptake. The findings may help demystify the interactions that lead to specific distributions of Fe2+ and Fe3+ at magnetite surfaces, toward design of more deliberately active catalysts and magnetic devices.
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Affiliation(s)
- Kelsey A Stoerzinger
- School of Chemical, Biological and Environmental Engineering , Oregon State University , 105 SW 26th St #116 , Corvallis , Oregon 97331 , United States
| | | | | | - Vaithiyalingam Shutthanandan
- Environmental Molecular Sciences Laboratory , Pacific Northwest National Laboratory , 3335 Innovation Blvd , Richland , Washington 99352 , United States
| | - Zhi Liu
- Advanced Light Source , Lawrence Berkeley National Laboratory , 6 Cyclotron Rd , Berkeley , California 94720 , United States
| | - Elke Arenholz
- Advanced Light Source , Lawrence Berkeley National Laboratory , 6 Cyclotron Rd , Berkeley , California 94720 , United States
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Li Y, Wei G, Zhang C, Liang X, Chu W, He H, Stucki JW, Ma L, Lin X, Zhu J. Remarkable effect of Co substitution in magnetite on the reduction removal of Cr(VI) coupled with aqueous Fe(II): Improvement mechanism and Cr fate. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 656:400-408. [PMID: 30513430 DOI: 10.1016/j.scitotenv.2018.11.344] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Revised: 11/22/2018] [Accepted: 11/23/2018] [Indexed: 06/09/2023]
Abstract
The interaction between magnetite and aqueous Fe(II) profoundly impacts the mineral recrystallization, trace-metal sequestration, and contaminant reduction. The iron ions in natural magnetite are extensively substituted by other cations. It is still unclear whether the substitution with thermodynamically favorable redox repairs (e.g., Co2+/Co3+) plays a vital role in the reducing capability of the coupled system. Herein, a series of Co-substituted magnetite samples (Fe3-xCoxO4, 0.00 ≤ x ≤ 1.00) were synthesized and tested for the reductive removal of Cr(VI) in the presence of Fe(II). Fe3-xCoxO4 had a spinel structure with the preferential occupancy of Co2+ on octahedral sites. No visible variation in the BET surface area was observed, whereas the surface site density increased gradually with Co substitution. Cr(VI) was found first adsorbed on the Fe3-xCoxO4 surface and then reduced to Cr(III) by the structural Fe2+ and the absorbed Fe(II), accompanied by the oxidation of bulk Fe2+ and surface Fe(II) in Fe3-xCoxO4 without phase transformation. The Cr(III) was precipitated on the Fe3-xCoxO4 surface with Fe(III), or substituted octahedral Fe in Fe3-xCoxO4. Both the reaction kinetics and the electron transfer efficiency revealed that Co substitution significantly improved the reactivity of Fe3-xCoxO4/Fe(II) towards Cr(VI) reduction. This was ascribed to the presence of the redox pairs Co2+/Co3+ and Fe2+/Fe3+ accelerating electron transfer from the Fe3-xCoxO4 interface to Cr(VI).
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Affiliation(s)
- Ying Li
- CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, PR China; Department of Natural Resources and Environmental Sciences, University of Illinois at Urbana-Champaign, IL 61801, United States; University of Chinese Academy of Sciences, Beijing 100049, PR China; Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, PR China
| | - Gaoling Wei
- Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangzhou 510650, PR China
| | - Caihua Zhang
- CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, PR China
| | - Xiaoliang Liang
- CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, PR China; Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong; University of Chinese Academy of Sciences, Beijing 100049, PR China; Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, PR China.
| | - Wei Chu
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
| | - Hongping He
- CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China; Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, PR China
| | - Joseph W Stucki
- Department of Natural Resources and Environmental Sciences, University of Illinois at Urbana-Champaign, IL 61801, United States
| | - Lingya Ma
- CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China; Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, PR China
| | - Xiaoju Lin
- CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China; Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, PR China
| | - Jianxi Zhu
- CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China; Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, PR China
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