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Li G, Jaisi DP, Wang M, Yan F, Zhang X, Jin Y, Zheng Z, Feng X. Zeolite facilitates sequestration of heavy metals via lagged Fe(II) oxidation during sediment aeration. JOURNAL OF HAZARDOUS MATERIALS 2024; 469:133961. [PMID: 38490148 DOI: 10.1016/j.jhazmat.2024.133961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2023] [Revised: 02/21/2024] [Accepted: 03/04/2024] [Indexed: 03/17/2024]
Abstract
Aeration of sediments could induce the release of endogenous heavy metals (HMs) into overlying water. In this study, experiments involving FeS oxygenation and contaminated sediment aeration were conducted to explore the sequestering role of zeolite in the released HMs during sediment aeration. The results reveal that the dynamic processes of Fe(II) oxidation play a crucial role in regulating HMs migration during both FeS oxygenation and sediment aeration in the absence of zeolite. Based on the release of HMs, Fe(II) oxidation can be delineated into two stages: stage I, where HMs (Mn2+, Zn2+, Cd2+, Ni2+, Cu2+) are released from minerals or sediments into suspension, and stage II, released HMs are partially re-sequestered back to mineral phases or sediments due to the generation of Fe-(oxyhydr) oxide. In contrast, the addition of zeolite inhibits the increase of HMs concentration in suspension during stage I. Subsequently, the redistribution of HMs between zeolite and the newly formed Fe-(oxyhydr) oxide occurs during stage II. This redistribution of HMs generates new sorption sites in zeolite, making them available for resorbing a new load of HMs. The outcomes of this study provide potential solutions for sequestering HMs during the sediment aeration.
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Affiliation(s)
- Gen Li
- Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China
| | - Deb P Jaisi
- Department of Plant and Soil Sciences, University of Delaware, Newark, DE 19716, United States
| | - Meng Wang
- Chang Jiang Water Resources Protection Institute, Wuhan 430051, China
| | - Fengling Yan
- Chang Jiang Water Resources Protection Institute, Wuhan 430051, China
| | - Xin Zhang
- State Environmental Protection Key Laboratory of Soil Health and Green Remediation, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Yaxuan Jin
- State Environmental Protection Key Laboratory of Soil Health and Green Remediation, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Zheng Zheng
- Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China.
| | - Xionghan Feng
- State Environmental Protection Key Laboratory of Soil Health and Green Remediation, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.
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2
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Ahmad A, van Genuchten CM. Deep-dive into iron-based co-precipitation of arsenic: A review of mechanisms derived from synchrotron techniques and implications for groundwater treatment. WATER RESEARCH 2024; 249:120970. [PMID: 38064786 DOI: 10.1016/j.watres.2023.120970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2023] [Revised: 09/25/2023] [Accepted: 12/02/2023] [Indexed: 01/03/2024]
Abstract
The co-precipitation of Fe(III) (oxyhydr)oxides with arsenic (As) is one of the most widespread approaches to treat As-contaminated groundwater in both low- and high-income settings. Fe-based co-precipitation of As occurs in a variety of conventional and decentralized treatment schemes, including aeration and sand filtration, ferric chloride addition and technologies based on controlled corrosion of Fe(0) (i.e., electrocoagulation). Despite its ease of deployment, Fe-based co-precipitation of As entails a complex series of chemical reactions that often occur simultaneously, including electron-transfer reactions, mineral nucleation, crystal growth, and As sorption. In recent years, the growing use of sophisticated synchrotron-based characterization techniques in water treatment research has generated new detailed and mechanistic insights into the reactions that govern As removal efficiency. The purpose of this critical review is to synthesize the current understanding of the molecular-scale reaction pathways of As co-precipitation with Fe(III), where the source of Fe(III) can be ferric chloride solutions or oxidized Fe(II) sourced from natural Fe(II) in groundwater, ferrous salts or controlled Fe(0) corrosion. We draw primarily on the mechanistic knowledge gained from spectroscopic and nano-scale investigations. We begin by describing the least complex reactions relevant in these conditions (Fe(II) oxidation, Fe(III) polymerization, As sorption in single-solute systems) and build to multi-solute systems containing common groundwater ions that can alter the pathways of As uptake during Fe(III) co-precipitation (Ca, Mg bivalent cations; P, Si oxyanions). We conclude the review by providing a perspective on critical knowledge gaps remaining in this field and new research directions that can further improve the understanding of As removal via Fe(III) co-precipitation.
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Affiliation(s)
- A Ahmad
- Department of Sustainable Development, Environmental Science and Engineering, KTH Royal Institute of Technology, Stockholm, Sweden; SIBELCO, Ankerpoort NV, Op de Bos 300, 6223 EP, Maastricht, the Netherlands
| | - C M van Genuchten
- Department of Geochemistry, Geological Survey of Denmark and Greenland (GEUS), Øster Voldgade 10, Copenhagen, Denmark.
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3
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Wu J, Meng Y, Wu F, Shi J, Sun Q, Jiang X, Liu Y, Zhao P, Wang Q, Guo L, Wu Y, Zheng X, Bu W. Ultrasound-Driven Non-Metallic Fenton-Active Center Construction for Extensive Chemodynamic Therapy. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2307980. [PMID: 37823714 DOI: 10.1002/adma.202307980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 09/25/2023] [Indexed: 10/13/2023]
Abstract
Chemodynamic therapy (CDT) is an emerging tumor microenvironment-responsive cancer therapeutic strategy based on Fenton/Fenton-like reactions. However, the effectiveness of CDT is subject to the slow kinetic rate and non-homogeneous distribution of H2 O2 . In this study, a conceptual non-metallic "Fenton-active" center construction strategy is proposed to enhance CDT efficiency using Bi0.44 Ba0.06 Na0.5 TiO2.97 (BNBT-6) nanocrystals. The separated charge carriers under a piezoelectric-induced electric field synchronize the oxidation of H2 O and reduction of H2 O2 , which consequently increases hydroxyl radical (·OH) yield even under low H2 O2 levels. Moreover, acceptor doping induces electron-rich oxygen vacancies to facilitate the dissociation of H2 O2 and H2 O and further promote ·OH generation. In vitro and in vivo experiments demonstrate that BNBT-6 induces extensive intracellular oxidative stress and enhances cell-killing efficiency by activating necroptosis in addition to the conventional apoptotic pathway. This study proposes a novel design approach for nanomaterials used in CDT and presents a new treatment strategy for apoptosis-resistant tumors.
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Affiliation(s)
- Jiyue Wu
- Department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers, Academy for Engineering and Technology, Fudan University, Shanghai, 200438, P. R. China
- Department of Radiation Oncology, Huadong Hospital Affiliated to Fudan University, Shanghai, 200040, P. R. China
| | - Yun Meng
- Department of Medical Ultrasound, Shanghai Tenth People's Hospital, Tongji University Cancer Center, Tongji University School of Medicine, Shanghai, 200072, P. R. China
| | - Fan Wu
- Department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers, Academy for Engineering and Technology, Fudan University, Shanghai, 200438, P. R. China
| | - Jieyun Shi
- Department of Medical Ultrasound, Shanghai Tenth People's Hospital, Tongji University Cancer Center, Tongji University School of Medicine, Shanghai, 200072, P. R. China
| | - Qingwen Sun
- Department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers, Academy for Engineering and Technology, Fudan University, Shanghai, 200438, P. R. China
| | - Xingwu Jiang
- Department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers, Academy for Engineering and Technology, Fudan University, Shanghai, 200438, P. R. China
| | - Yanyan Liu
- Department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers, Academy for Engineering and Technology, Fudan University, Shanghai, 200438, P. R. China
| | - Peiran Zhao
- Department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers, Academy for Engineering and Technology, Fudan University, Shanghai, 200438, P. R. China
| | - Qiao Wang
- Department of Medical Ultrasound, Shanghai Tenth People's Hospital, Tongji University Cancer Center, Tongji University School of Medicine, Shanghai, 200072, P. R. China
| | - Lehang Guo
- Department of Medical Ultrasound, Shanghai Tenth People's Hospital, Tongji University Cancer Center, Tongji University School of Medicine, Shanghai, 200072, P. R. China
| | - Yelin Wu
- Department of Medical Ultrasound, Shanghai Tenth People's Hospital, Tongji University Cancer Center, Tongji University School of Medicine, Shanghai, 200072, P. R. China
| | - Xiangpeng Zheng
- Department of Radiation Oncology, Huadong Hospital Affiliated to Fudan University, Shanghai, 200040, P. R. China
| | - Wenbo Bu
- Department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers, Academy for Engineering and Technology, Fudan University, Shanghai, 200438, P. R. China
- Department of Radiation Oncology, Huadong Hospital Affiliated to Fudan University, Shanghai, 200040, P. R. China
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Pan K, Hou H, Hu J, Yang J, Xiang J, Li C, Xu C, Chen S, Liang S, Yang J. Ca and Cu doped LaFeO 3 to promote coupling of photon carriers and redox cycling for facile photo-Fenton degradation of bisphenol A. CHEMOSPHERE 2022; 308:136325. [PMID: 36084826 DOI: 10.1016/j.chemosphere.2022.136325] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 08/31/2022] [Accepted: 09/01/2022] [Indexed: 06/15/2023]
Abstract
Enhancements in the light response and hydrogen peroxide utilization are critical to the catalytic performance of heterogeneous Fenton-like perovskites. Here, in this research, oxygen vacancy-enriched La0.9Ca0.1Cu0.5Fe0.5O3-δ was prepared by a co-precipitation method with Cu substitution and Ca doping and demonstrated excellent performance for the degradation of bisphenol A. Both total organic carbon (TOC) removal and hydrogen peroxide utilization were close to 90% within 120 min at pH 3-7, where the TOC removal and hydrogen peroxide utilization were 2.5 times and 5.5 times of LaFeO3 in the absence of Ca and Cu doping. It demonstrated excellent stability to light irradiation and oxidation with respect to cycling and metal ion leaching. This revealed that oxygen vacancies were enriched in the catalyst with the substitution of Ca and Cu and contributed to the recombination of photogenerated electrons, thereby increasing the reduction efficiency of copper ions and accelerating the redox cycling of iron ions.
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Affiliation(s)
- Keliang Pan
- Hubei Institute of Geosciences, Wuhan, Hubei 430034, PR China; School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, PR China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycling, Huazhong University of Science and Technology (HUST), Wuhan, Hubei, 430074, PR China; Hubei Key Laboratory of Resource and Ecological Environment Geology, Wuhan, Hubei, 430034, PR China
| | - Huijie Hou
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, PR China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycling, Huazhong University of Science and Technology (HUST), Wuhan, Hubei, 430074, PR China
| | - Jingping Hu
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, PR China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycling, Huazhong University of Science and Technology (HUST), Wuhan, Hubei, 430074, PR China; State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology (HUST), Wuhan, Hubei, 430074, PR China.
| | - Jun Yang
- Hubei Institute of Geosciences, Wuhan, Hubei 430034, PR China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycling, Huazhong University of Science and Technology (HUST), Wuhan, Hubei, 430074, PR China
| | - Jianqiao Xiang
- Hubei Institute of Geosciences, Wuhan, Hubei 430034, PR China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycling, Huazhong University of Science and Technology (HUST), Wuhan, Hubei, 430074, PR China
| | - Chuncheng Li
- Hubei Institute of Geosciences, Wuhan, Hubei 430034, PR China
| | - Chunyan Xu
- Hubei Institute of Geosciences, Wuhan, Hubei 430034, PR China
| | - Sijing Chen
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, PR China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycling, Huazhong University of Science and Technology (HUST), Wuhan, Hubei, 430074, PR China
| | - Sha Liang
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, PR China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycling, Huazhong University of Science and Technology (HUST), Wuhan, Hubei, 430074, PR China
| | - Jiakuan Yang
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, PR China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycling, Huazhong University of Science and Technology (HUST), Wuhan, Hubei, 430074, PR China; State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology (HUST), Wuhan, Hubei, 430074, PR China
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5
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Liao X, Cao J, Lei M, Zhang C, Hu L. Impact of manganese sulfide (MnS) oxygenation-induced oxidization on aqueous organic contaminants: Insight into the role of the hydroxyl radical (HO·). THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 840:156702. [PMID: 35710007 DOI: 10.1016/j.scitotenv.2022.156702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2022] [Revised: 05/29/2022] [Accepted: 06/10/2022] [Indexed: 06/15/2023]
Abstract
Manganese sulfide (MnS) has unique reactive abilities and can affect the fate and toxicity of contaminants in the natural environment, specifically sulfidic sediments that undergo biogeochemical changes due to natural and artificial processes. However, the effect of oxidization induced by the oxygenation of MnS on organic contaminants remains poorly understood. Herein, we revealed that the hydroxyl radical (HO·) was the dominant reactive oxidant for the rapid degradation of the assessed hydrophobic organic contaminants (including azo dye, nitroaromatic compounds, pesticide, and an endocrine disrupt chemical) during the oxygenation of MnS based on the competitive dynamic experiments, quenching experiments and electron spin resonance (ESR) methods. The removal rates of the assessed organic contaminants were significantly dependent on MnS dosage and co-solutes, including sediment humic acid, metal ions (Mn2+and Fe3+), and inorganic anions (PO43-and Cl-). HO· scavenging by sulfide and its oxidation products (e.g., elemental sulfur), rather than dissolved Mn2+, was responsible for the low utilization efficiency of HO· for the assessed contaminants. The contribution of the manganese oxide (MnO2) generated by the oxygenation of MnS to the examined degradation of contaminants could be neglected. Considered collectively, the reaction between H2O2 and MnO2 generated superoxide radicals (O2-·) which dominated the generation of HO· in an oxic MnS suspension. The results suggest that the impact of oxidization induced by the oxygenation of MnS on environmental contaminants should be of concern in both natural and engineered systems.
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Affiliation(s)
- Xiaoping Liao
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, PR China.
| | - Jinru Cao
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, PR China
| | - Meng Lei
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, PR China
| | - Caixiang Zhang
- State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, PR China
| | - Lisong Hu
- School of Xingfa Mining Engineering, Wuhan Institute of Technology, Wuhan 430205, PR China
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6
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Roy M, van Genuchten CM, Rietveld L, van Halem D. Groundwater-native Fe(II) oxidation prior to aeration with H 2O 2 to enhance As(III) removal. WATER RESEARCH 2022; 223:119007. [PMID: 36044797 DOI: 10.1016/j.watres.2022.119007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 08/17/2022] [Accepted: 08/18/2022] [Indexed: 06/15/2023]
Abstract
Groundwater contaminated with arsenic (As) must be treated prior to drinking, as human exposure to As at toxic levels can cause various diseases including cancer. Conventional aeration-filtration applied to anaerobic arsenite (As(III)) contaminated groundwater can remove As(III) by co-oxidizing native iron (Fe(II)) and As(III) with oxygen (O2). However, the As(III) removal efficiency of conventional aeration can be low, in part, because of incomplete As(III) oxidation to readily-sorbed arsenate (As(V)). In this work, we investigated a new approach to enhance As(III) co-removal with native Fe(II) by the anaerobic addition of hydrogen peroxide (H2O2) prior to aeration. Experiments were performed to co-oxidize Fe(II) and As(III) with H2O2 (anaerobically), O2 (aerobically), and by sequentially adding of H2O2 and O2. Aqueous As(III) and As(V) measurements after the reaction were coupled with solid-phase speciation by Fe and As K-edge X-ray absorption spectroscopy (XAS). We found that complete anaerobic oxidation of 100 µM Fe(II) with 100 µM H2O2 resulted in co-removal of 95% of 7 µM As(III) compared to 44% with 8.0-9.0 mg/L dissolved O2. Furthermore, we found that with 100 µM Fe(II), the initial Fe(II):H2O2 ratio was a critical parameter to remove 7 µM As(III) to below the 10 µg/L (0.13 µM) WHO guideline, where ratios of 1:4 (mol:mol) Fe(II):H2O2 led to As(III) removal matching that of 7 µM As(V). The improved As(III) removal with H2O2 was found to occur partly because of the well-established enhanced efficiency of As(III) oxidation in Fe(II)+H2O2 systems relatively to Fe(II)+O2 systems. However, the XAS results unambiguously demonstrated that a large factor in the improved As(III) removal was also due to a systematic decrease in crystallinity, and thus increase in specific surface area, of the generated Fe(III) (oxyhydr)oxides from lepidocrocite in the Fe(II)+O2 system to poorly-ordered Fe(III) precipitates in the Fe(II)+H2O2 system. The combined roles of H2O2 (enhanced As(III) oxidation and structural modification) can be easily overlooked when only aqueous species are measured, but this dual impact must be considered for accurate predictions of As removal in groundwater treatment.
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Affiliation(s)
- Mrinal Roy
- Water Management Department, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, Delft CN 2628, the Netherlands.
| | - Case M van Genuchten
- Department of Geochemistry, Geological Survey of Denmark and Greenland, Copenhagen DK 1350, Denmark
| | - Luuk Rietveld
- Water Management Department, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, Delft CN 2628, the Netherlands
| | - Doris van Halem
- Water Management Department, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, Delft CN 2628, the Netherlands
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7
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Ribeiro R, de Oliveira Duque CC, Ortecho-Zuta U, Leite ML, Hebling J, Soares DG, de Souza Costa CA. Influence of Manganese Oxide on the Esthetic Efficacy and Toxicity Caused by Conventional In-office Tooth Bleaching Therapy. Oper Dent 2022; 47:425-436. [PMID: 35917237 DOI: 10.2341/20-257-l] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/10/2021] [Indexed: 11/23/2022]
Abstract
OBJECTIVE This study aimed to evaluate the esthetic efficacy, cytotoxicity, and kinetics of decomposition of hydrogen peroxide (H2O2) present in a commercial bleaching gel with 35% H2O2 (BG35%) chemically activated with manganese oxide (MnO2). METHODS AND MATERIALS After incorporating 2 mg/mL, 6 mg/mL, and 10 mg/mL of MnO2 into BG35%, the stability of pH and temperature of the products were analyzed. To assess the esthetic efficacy (ΔE and ΔWI), the BG35%s with MnO2 were applied for 45 minutes on enamel/dentin discs (DiE/D). BG35% or no treatment were used as positive (PC) and negative (NC) controls, respectively. To analyze the cell viability (CV) and oxidative stress (OXS), the same bleaching protocols were performed on DiE/D adapted to artificial pulp chambers. The extracts (culture medium + gel components that diffused through the discs) were applied to pulp cells and submitted to H2O2 quantification. BG35% with MnO2 that showed the best results was evaluated relative to kinetic decomposition of H2O2, with consequent generation of free radicals (FR) and hydroxyl radicals (OH•). The data were submitted to the one-way analysis of variance complemented by Tukey post-test (α=0.05). Data on kinetics of H2O2 decomposition were submitted to the Student's-t test (α=0.05). RESULTS All the BG35%s with MnO2 showed stability of pH and temperature, and the gel with 10 mg/mL of this activator had an esthetic efficacy 31% higher than that of the PC (p<0.05). Reduction in OXS and trans-amelodentinal diffusion of H2O2 occurred when all the BG35%s with MnO2 were used. The addition of 6 and 10 mg/mL of MnO2 to BG35% increased the CV in comparison with PC, confirmed by the cell morphology analysis. An increase in FR and OH• formation was observed when 10 mg/mL of MnO2 was added to BG35%. CONCLUSION Catalysis of BG35% with MnO2 minimized the trans-amelodentinal diffusion of H2O2 and toxicity of the product to pulp cells. BG35% containing 10 mg/mL of MnO2 potentiated the decomposition of H2O2, enhancing the generation of FR and OH•, as well as the efficacy of the in-office tooth therapy.
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Affiliation(s)
- Rao Ribeiro
- Rafael Antonio de Oliveira Ribeiro, PhD student, Department of Dental Materials and Prosthodontics, Univ Estadual Paulista - UNESP, Araraquara School of Dentistry, Araraquara, SP, Brazil. ORCID: 0000-0001-8100-3294
| | - C C de Oliveira Duque
- Carla Caroline de Oliveira Duque, PhD, Department of Dental Materials and Prosthodontics, Univ Estadual Paulista -UNESP, Araraquara School of Dentistry, Araraquara, SP, Brazil. ORCID 0000-0002-5898-4132
| | - U Ortecho-Zuta
- Uxua Ortecho Zuta, PhD student, Department of Dental Materials and Prosthodontics, Univ Estadual Paulista -UNESP, Araraquara School of Dentistry, Araraquara, SP, Brazil. ORCID 0000-0002-2922-3609
| | - M L Leite
- Maria Luísa Leite, PhD student, Department of Dental Materials and Prosthodontics, Univ Estadual Paulista -UNESP, Araraquara School of Dentistry, Araraquara, SP, Brazil. ORCID 0000-0001-6650-3637
| | - J Hebling
- Josimeri Hebling, professor, Department of Orthodontics and Pediatric Dentistry, Univ Estadual Paulista - UNESP, Araraquara School of Dentistry, Araraquara, SP, Brazil. ORCID 0000-0002-2846-2325
| | - D G Soares
- Diana Gabriela Soares, professor, Department of Dentistry, Endodontics and Dental Materials, Univ de São Paulo - USP, Bauru, Bauru School of Dentistry, Bauru, SP, Brazil. ORCID 0000-0002-1485-6104
| | - C A de Souza Costa
- *Carlos Alberto de Souza Costa, professor, Department of Physiology and Pathology, Univ Estadual Paulista - UNESP, Araraquara School of Dentistry, Araraquara, SP, Brazil. ORCID 0000-0002-7455-6867
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8
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Xie S, Li C, Liao P, Wang J, Chen J, Qian A, Zhang Y, Wei T, Cheng D, Jia M. Experimental and modeling evidence of hydroxyl radical production in iron electrocoagulation as a new mechanism for contaminant transformation in bicarbonate electrolyte. WATER RESEARCH 2022; 220:118662. [PMID: 35640510 DOI: 10.1016/j.watres.2022.118662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 04/24/2022] [Accepted: 05/21/2022] [Indexed: 06/15/2023]
Abstract
Iron electrocoagulation is designed for sustainable high-efficiency and high-flexibility water purification applications. Recent advances reported that hydroxyl radicals (•OH)-based oxidative transformation of organic contaminants can occur in iron electrocoagulation. However, there is still a lack of mechanistic understanding the production of •OH in bicarbonate electrolyte, which presents a critical knowledge gap in the optimization of iron electrocoagulation technology towards practical application. Combined with contaminant degradation, radical quenching experiments, and spectroscopic techniques, we found that •OH was produced at rate of 16.1 μM∙h - 1 during 30-mA iron electrocoagulation in bicarbonate electrolyte through activation of O2 by Fe(II) under pH-neutral conditions. High yield of •OH occurred at pH 8.5, likely due to high adsorbed Fe(II) that can activate O2 to enhance •OH production. Mössbauer and X-ray photoelectron spectroscopy measurements substantiated that Fe(II)-adsorbed lepidocrocite was the dominant solid Fe(II) species at pH 8.5. A process-based kinetic modeling was developed to describe the dynamic of •OH production, Fe(II) oxidation, and contaminant degradation processes in iron electrocoagulation. Findings of this study extend the functionality of electrocoagulation from phase separation to •OH-based advanced oxidation process, which provides a new perspective for the development of electrocoagulation-based next generation sustainable water purification technology.
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Affiliation(s)
- Shiwei Xie
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China
| | - Chang Li
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China
| | - Peng Liao
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China.
| | - Jingfu Wang
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
| | - Jingan Chen
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
| | - Ao Qian
- State Key Lab of Biogeology and Environmental Geology, China University of Geosciences, No. 68 Jincheng Street, East Lake High-Tech Development Zone, Wuhan, Hubei 430078, China
| | - Yan Zhang
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China
| | - Taoyuan Wei
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China
| | - Dong Cheng
- State Key Lab of Biogeology and Environmental Geology, China University of Geosciences, No. 68 Jincheng Street, East Lake High-Tech Development Zone, Wuhan, Hubei 430078, China
| | - Mengqi Jia
- Department of Earth, Ocean and Atmospheric Sciences, The University of British Columbia, 2207 Main Mall, Vancouver, BC V6T 1Z4, Canada.
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9
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Shao Y, Sun Q, Wang L, Zhan W, Zhang H, Zhong H. Migration and transformation of Sb are affected by Mn(III/IV) associated with lepidocrocite originating from Fe(II) oxidation. J Environ Sci (China) 2022; 115:308-318. [PMID: 34969458 DOI: 10.1016/j.jes.2021.08.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 08/04/2021] [Accepted: 08/05/2021] [Indexed: 06/14/2023]
Abstract
Antimony (Sb) is a recognized priority pollutant with toxicity that is influenced by its migration and transformation processes. Oxidation of Fe(II) to Fe(III) oxides, which is a common phenomenon in the environment, is often accompanied by the formation of Mn(III/IV) and might affect the fate of Sb. In this study, incorporated Mn(III) and sorbed/precipitated Mn(III/IV) associated with lepidocrocite were prepared by adding Mn(II) during and after Fe(II) oxidation, respectively, and the effects of these Mn species on Sb fate were investigated. Our results indicated that the association of these Mn species with lepidocrocite obviously enhanced Sb(III) oxidation to Sb(V), while concomitantly inhibiting Sb sorption due to the lower sorption capacity of lepidocrocite for Sb(V) than Sb(III). Additionally, Mn oxide equivalents increased in the presence of Sb, indicating that Sb oxidation by Mn(III/IV) associated with lepidocrocite was a continuous recycling process in which Mn(II) released from Mn(III/IV) reduction by Sb(III) could be oxidized to Mn(III/IV) again. This recycling process was favorable for effective Sb(III) oxidation. Moreover, Sb(V) generated from Sb(III) oxidation by Mn(III/IV) enhanced Mn(II) sorption at the beginning of the process, and thus favored Mn(III/IV) formation, which could further promote Sb(III) oxidation to Sb(V). Overall, this study elucidated the effects of Mn(III/IV) associated with lepidocrocite arisen from Fe(II) oxidation on Sb migration and transformation and revealed the underlying reaction mechanisms, contributing to a better understanding of the geochemical dynamics of Sb.
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Affiliation(s)
- Yalu Shao
- State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; School of Agriculture and Food, The University of Melbourne, Victoria 3010, Australia
| | - Qian Sun
- College of Agricultural Sciences and Engineering, Hohai University, Nanjing 210098, China.
| | - Liangkai Wang
- College of Agricultural Sciences and Engineering, Hohai University, Nanjing 210098, China
| | - Weiyong Zhan
- State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
| | - Hongwei Zhang
- State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
| | - Hua Zhong
- State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China.
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10
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Li X, Graham NJD, Deng W, Liu M, Liu T, Yu W. Structural Variation of Precipitates Formed by Fe(II) Oxidation and Impact on the Retention of Phosphate. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:4345-4355. [PMID: 35319869 DOI: 10.1021/acs.est.1c06256] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The oxidation-precipitation process of Fe(II) is ubiquitous in the environment and critically affects the fate of contaminants and nutrients in natural systems where Fe(II) is present. Here, we explored the effect of H2O2 concentration on the structure of precipitates formed by Fe(II) oxidation and compared the precipitates to those formed by Fe(III) hydrolysis. Additionally, the phosphate retention under different H2O2 concentrations was evaluated. XRD, TEM, PDA, XPS, and UV-visible absorbance spectroscopy were used to characterize the structure of the formed precipitates; UV-visible absorbance spectroscopy was also used to determine the residual phosphate and Fe(II) in solution. It was found that the predominant precipitates in Fe(II) solution changed from planar-shaped crystalline lepidocrocite (γ-FeOOH) to poor short-range order (poorly crystalline) spherical-shaped hydrous ferric oxide (HFO) with increasing H2O2 concentrations. Although the HFO precipitates formed from Fe(II) resembled those formed from Fe(III) hydrolysis, the former was larger and had clearer lattice fringes. During the formation of γ-FeOOH, both Fe(II)-Fe(III) complexes and ligand-to-metal charge transfer processes were observed, and it was found that Fe(II) was present in the planar-shaped precipitates. Fe(II) might be present in the interior of precipitates as Fe(OH)2, which could serve as a nucleus for the epitaxial growth of γ-FeOOH. In addition, the extent of phosphate retention increased with the H2O2 concentration, indicating the increased reactivity of formed precipitates with H2O2 concentration. More phosphate was retained via coprecipitation with Fe than adsorption on the preformed Fe precipitates due to the incorporation of phosphate within the structure of the formed Fe hydroxyphosphate via coprecipitation.
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Affiliation(s)
- Xian Li
- School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
- State Key Laboratory of Environmental Aquatic Chemistry, Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, People's Republic of China
| | - Nigel J D Graham
- Department of Civil and Environmental Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, U.K
| | - Wensheng Deng
- School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Mengjie Liu
- State Key Laboratory of Environmental Aquatic Chemistry, Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, People's Republic of China
| | - Ting Liu
- School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Wenzheng Yu
- State Key Laboratory of Environmental Aquatic Chemistry, Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, People's Republic of China
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11
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Chen Y, Miller CJ, Waite TD. pH Dependence of Hydroxyl Radical, Ferryl, and/or Ferric Peroxo Species Generation in the Heterogeneous Fenton Process. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:1278-1288. [PMID: 34965094 DOI: 10.1021/acs.est.1c05722] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The heterogeneous Fenton process in the presence of Fe-containing minerals is ubiquitous in nature and widely deployed in wastewater treatment. While there have been extensive relevant studies, the dependence on pH of the nature and extent of oxidant generation and key reaction pathways remain unclear. Herein, the adsorption and decomposition of formate and H2O2 were quantified in the presence of ferrihydrite within the pH range of 3.0-6.0, and experiments with methyl phenyl sulfoxide were conducted to distinguish between HO• and weaker oxidant(s) which react via oxygen atom transfer including ferryl ion ([FeIVO]2+) and/or ferric hydroperoxo intermediates (≡FeIII(O2H)). Both HO• and [FeIVO]2+/≡FeIII(O2H) are concurrently produced on the surface over the acidic to near-neutral pH range. Despite the simultaneous formation of both oxidants, HO• is the major oxidant responsible for substrate oxidation in the interfacial boundary layer with [FeIVO]2+/≡FeIII(O2H) exhibiting limited exposure to substrates. With an increase of pH, the yield of both oxidants is inhibited by the decreasing availability of surface sites due to ferrihydrite particle aggregation. Increasing pH also favors the nonradical decay of H2O2 as evident from the consistent oxidant production rate relative to the surface area (SSA) despite an accelerated H2O2 decay rate relative to SSA with pH increase.
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Affiliation(s)
- Yufan Chen
- School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia
| | - Christopher J Miller
- School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia
| | - T David Waite
- School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia
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12
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Zhu H, Zou H. Ultra-efficient catalytic degradation of malachite green dye wastewater by KMnO 4-modified biochar (Mn/SRBC). RSC Adv 2022; 12:27002-27011. [PMID: 36320839 PMCID: PMC9494031 DOI: 10.1039/d2ra04263k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Accepted: 09/08/2022] [Indexed: 11/21/2022] Open
Abstract
In this work, KMnO4-modified biochar was prepared from spirulina residue as the research object. Herein, we report the synthesis, characterization, and catalytic degradation performance of KMnO4-modified biochar, given that heterogeneous catalytic oxidation is an effective way to treat dye wastewater rapidly. The Mn/SRBC catalyst prepared by KMnO4 modification was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffractometry, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, nitrogen adsorption–desorption and laser Raman spectroscopy. In addition, we compared the results with that of the unmodified SRBC. The results showed that the Mn/SRBC catalyst prepared by KMnO4 modification had a rich pore structure, which provided sufficient contact area for the catalytic reaction. In the presence of H2O2, the catalyst could be used to catalyze the oxidative degradation of malachite green in aqueous solution with ultra-high efficiency. In the experiment, the initial pH values of the reaction system had a significant influence on the reaction rate. The removal effect of biochar on the malachite green was poor in an alkaline environment. Within a specific range, the removal rate of malachite green was proportional to the concentration of H2O2 in the reaction system. The degradation rate of malachite green dye at 8000 mg L−1 was about 99% in the presence of the catalyst over 5 mmol L−1 hydrogen peroxide for 30 min. These results show the potential application of algae residue biochar and carbon-based composite catalysts for degrading and removing dye wastewater. In this work, KMnO4-modified biochar was prepared from spirulina residue as the research object.![]()
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Affiliation(s)
- Hao Zhu
- Department of Resource and Environment, Anhui Science and Technology University, Fengyang 233100, People's Republic of China
| | - Haiming Zou
- Department of Resource and Environment, Anhui Science and Technology University, Fengyang 233100, People's Republic of China
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13
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Li H, Santos F, Butler K, Herndon E. A Critical Review on the Multiple Roles of Manganese in Stabilizing and Destabilizing Soil Organic Matter. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:12136-12152. [PMID: 34469151 DOI: 10.1021/acs.est.1c00299] [Citation(s) in RCA: 48] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Manganese (Mn) is a biologically important and redox-active metal that may exert a poorly recognized control on carbon (C) cycling in terrestrial ecosystems. Manganese influences ecosystem C dynamics by mediating biochemical pathways that include photosynthesis, serving as a reactive intermediate in the breakdown of organic molecules, and binding and/or oxidizing organic molecules through organo-mineral associations. However, the potential for Mn to influence ecosystem C storage remains unresolved. Although substantial research has demonstrated the ability of Fe- and Al-oxides to stabilize organic matter, there is a scarcity of similar information regarding Mn-oxides. Furthermore, Mn-mediated reactions regulate important litter decomposition pathways, but these processes are poorly constrained across diverse ecosystems. Here, we discuss the ecological roles of Mn in terrestrial environments and synthesize existing knowledge on the multiple pathways by which biogeochemical Mn and C cycling intersect. We demonstrate that Mn has a high potential to degrade organic molecules through abiotic and microbially mediated oxidation and to stabilize organic molecules, at least temporarily, through organo-mineral associations. We outline research priorities needed to advance understanding of Mn-C interactions, highlighting knowledge gaps that may address key uncertainties in soil C predictions.
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Affiliation(s)
- Hui Li
- Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Fernanda Santos
- Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Kristen Butler
- Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Department of Earth and Planetary Sciences, College of Arts & Sciences, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Elizabeth Herndon
- Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Department of Earth and Planetary Sciences, College of Arts & Sciences, University of Tennessee, Knoxville, Tennessee 37996, United States
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14
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Wang P, Wang H, Zhang Y, Yi J, Chen M, Jiang H, Yan J, Liu H, Ma J. Accelerated catalytic oxidation of dissolved manganese(II) by chlorine in the presence of in situ-growing 3D manganese(III)/(IV) oxide nanosheet assembly in zeolite filter. WATER RESEARCH 2021; 201:117223. [PMID: 34146760 DOI: 10.1016/j.watres.2021.117223] [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: 01/18/2021] [Revised: 04/02/2021] [Accepted: 05/03/2021] [Indexed: 06/12/2023]
Abstract
Manganese contamination is ubiquitous in ground water. Water eutrophication also exaggerates manganese release and contamination in surface water. However, conventional manganese(II) removal process through sand filter is low-efficiency and long-term ripening. Manganese exceeding standard is still a bottleneck issue for drinking water plants. To provide a quick-setup and low-cost means, we invented an accelerated catalytic oxidation filtration process through porous zeolite filter with dynamically coating of manganese oxide nanocatalysts. In dynamic filtration process, the addition of chlorine less than redox stoichiometric consumption can efficiently remove dissolved manganese(II) from contaminated tap water, ground water and Songhua river water. Characterization results showed that a continuous manganese(III)/(IV) oxide nanosheet catalyst was dynamically in situ-growing and assembled into 3D porous superstructure in the reactive Zeolite@MnOx(s) filter. Active Mn(III) species on the edges of MnOx(s) nanosheets were dynamically generated and transferred into stable Mn(IV) species on the layer-structured surface. The cycling transformation of manganese(III)/(IV) species was responsible for the accelerated catalytic oxidation of dissolved manganese(II) by chlorine. Without process changes in drinking water plant, the porous Zeolite@MnOx(s) media could be feasibly integrated onto the existing sand filtration tanks for emergence handling of manganese(II) contamination. This novel reactive Zeolite@MnOx(s) filter with higher hydraulic conductivity provides a high-efficiency, scalable and low-cost technique for the manganese(II) removal from various of water environments.
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Affiliation(s)
- Panpan Wang
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Han Wang
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Yunfei Zhang
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Junda Yi
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Mansheng Chen
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Haicheng Jiang
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Jiaying Yan
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Huiling Liu
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Jun Ma
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
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15
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Charbonnet JA, Duan Y, van Genuchten CM, Sedlak DL. Regenerated Manganese-Oxide Coated Sands: The Role of Mineral Phase in Organic Contaminant Reactivity. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:5282-5290. [PMID: 33750102 DOI: 10.1021/acs.est.0c05745] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Manganese oxide-coated sand can oxidize electron-rich organic contaminants, but after extended exposure to contaminated water its reactivity decreases. To assess the potential for regenerating geomedia, we measured the ability of passivated manganese-oxide coated sand to oxidize bisphenol A after treatment with oxidants, acid, or methanol. Among the regenerants studied, KMnO4, HOCl, HOBr, and pH 2 or 3 HCl solutions raised the average oxidation state of the Mn, but only HOCl and HOBr restored the reactivity of passivated geomedia to levels comparable to those of the virgin manganese-oxide coated sand. Treatment with HCl restored about one third of the reactivity of the material, likely due to dissolution of reduced Mn. Mn K-edge X-ray absorption spectroscopy data indicated that the reactive manganese oxide phases present in virgin geomedia and geomedia regenerated with HOCl or HOBr had nanocrystalline cryptomelane-like structures and diminished Mn(III) abundance relative to the passivated geomedia. KMnO4-regenerated geomedia also had less Mn(III), but it exhibited less reactivity with bisphenol A because regeneration produced a structure with characteristics of δ-MnO2. The results imply that manganese oxide reactivity depends on both oxidation state and crystal structure; the most effective chemical regenerants oxidize Mn(III) to Mn(IV) oxides exhibiting nanocrystalline, cryptomelane-like forms.
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Affiliation(s)
- Joseph A Charbonnet
- National Science Foundation Engineering Research Center for Reinventing the Nation's Urban Water Infrastructure (ReNUWIt) and Department of Civil & Environmental Engineering, University of California, Berkeley, California United States
| | - Yanghua Duan
- National Science Foundation Engineering Research Center for Reinventing the Nation's Urban Water Infrastructure (ReNUWIt) and Department of Civil & Environmental Engineering, University of California, Berkeley, California United States
| | - Case M van Genuchten
- Geochemistry Department of the Geological Survey of Denmark and Greenland (GEUS), Copenhagen, Denmark
| | - David L Sedlak
- National Science Foundation Engineering Research Center for Reinventing the Nation's Urban Water Infrastructure (ReNUWIt) and Department of Civil & Environmental Engineering, University of California, Berkeley, California United States
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16
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Zeiner CA, Purvine SO, Zink E, Wu S, Paša-Tolić L, Chaput DL, Santelli CM, Hansel CM. Mechanisms of Manganese(II) Oxidation by Filamentous Ascomycete Fungi Vary With Species and Time as a Function of Secretome Composition. Front Microbiol 2021; 12:610497. [PMID: 33643238 PMCID: PMC7902709 DOI: 10.3389/fmicb.2021.610497] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2020] [Accepted: 01/11/2021] [Indexed: 02/03/2023] Open
Abstract
Manganese (Mn) oxides are among the strongest oxidants and sorbents in the environment, and Mn(II) oxidation to Mn(III/IV) (hydr)oxides includes both abiotic and microbially-mediated processes. While white-rot Basidiomycete fungi oxidize Mn(II) using laccases and manganese peroxidases in association with lignocellulose degradation, the mechanisms by which filamentous Ascomycete fungi oxidize Mn(II) and a physiological role for Mn(II) oxidation in these organisms remain poorly understood. Here we use a combination of chemical and in-gel assays and bulk mass spectrometry to demonstrate secretome-based Mn(II) oxidation in three phylogenetically diverse Ascomycetes that is mechanistically distinct from hyphal-associated Mn(II) oxidation on solid substrates. We show that Mn(II) oxidative capacity of these fungi is dictated by species-specific secreted enzymes and varies with secretome age, and we reveal the presence of both Cu-based and FAD-based Mn(II) oxidation mechanisms in all 3 species, demonstrating mechanistic redundancy. Specifically, we identify candidate Mn(II)-oxidizing enzymes as tyrosinase and glyoxal oxidase in Stagonospora sp. SRC1lsM3a, bilirubin oxidase in Stagonospora sp. and Paraconiothyrium sporulosum AP3s5-JAC2a, and GMC oxidoreductase in all 3 species, including Pyrenochaeta sp. DS3sAY3a. The diversity of the candidate Mn(II)-oxidizing enzymes identified in this study suggests that the ability of fungal secretomes to oxidize Mn(II) may be more widespread than previously thought.
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Affiliation(s)
- Carolyn A Zeiner
- Department of Biology, University of St. Thomas, Saint Paul, MN, United States
| | - Samuel O Purvine
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, United States
| | - Erika Zink
- Biological Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, United States
| | - Si Wu
- Department of Chemistry and Biochemistry, The University of Oklahoma, Norman, OK, United States
| | - Ljiljana Paša-Tolić
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, United States
| | - Dominique L Chaput
- Biosciences, Geoffrey Pope Building, University of Exeter, Exeter, United Kingdom
| | - Cara M Santelli
- Department of Earth and Environmental Sciences, University of Minnesota, Minneapolis, MN, United States
| | - Colleen M Hansel
- Department of Marine Chemistry & Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, United States
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17
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Bicudo B, van Halem D, Trikannad SA, Ferrero G, Medema G. Low voltage iron electrocoagulation as a tertiary treatment of municipal wastewater: removal of enteric pathogen indicators and antibiotic-resistant bacteria. WATER RESEARCH 2021; 188:116500. [PMID: 33059157 DOI: 10.1016/j.watres.2020.116500] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 09/15/2020] [Accepted: 10/05/2020] [Indexed: 06/11/2023]
Abstract
In this paper we analyse the feasibility of low voltage iron electrocoagulation as a means of municipal secondary effluent treatment with a focus on removal of microbial indicators, Antibiotic Resistant Bacteria (ARB) and nutrients. A laboratory scale batch unit equipped with iron electrodes was used on synthetic and real secondary effluent from a municipal wastewater treatment plant. Synthetic secondary effluent was separately assayed with spiked Escherichia coli WR1 and with bacteriophage ΦX174, while real effluent samples were screened before and after treatment for E. coli, Extended Spectrum Betalactamase-producing E. coli, Enterococci, Vancomycin Resistant Enterococci, Clostridium perfringens spores and somatic coliphages. Charge dosage (CD) and charge dosage rate (CDR) were used as the main process control parameters. Experiments with synthetic secondary effluent showed >4log10 and >5log10 removal for phage ΦX174 and for E. coli WR1, respectively. In real effluents, bacterial indicator removal exceeded 3.5log10, ARB were removed below detection limit (≥2.5log10), virus removal reached 2.3log10 and C. perfringens spore removal exceeded 2.5log10. Experiments in both real and synthetic wastewater showed that bacterial removal increased with increasing CD and decreasing CDR. Virus removal increased with increasing CD but was irresponsive to CDR. C. perfringens spore removal increased with increasing CD yet reached a removal plateau, being also irresponsive to CDR. Phosphate removal exceeded 99%, while total nitrogen and chemical oxygen demand removal were below 15% and 58%, respectively. Operational cost estimates were made for power and iron plate consumption, and were found to be in the range of 0.01 to 0.24€/m3 for the different assayed configurations. In conclusion, low voltage Fe-EC is a promising technology for pathogen reduction of secondary municipal effluents, with log10 removals comparable to those achieved by conventional disinfection methods such as chlorination, UV or ozonation.
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Affiliation(s)
- Bruno Bicudo
- Faculty of Civil Engineering and Geosciences, Water Management Department, TU Delft, The Netherlands.
| | - Doris van Halem
- Faculty of Civil Engineering and Geosciences, Water Management Department, TU Delft, The Netherlands
| | - Shreya Ajith Trikannad
- Faculty of Civil Engineering and Geosciences, Water Management Department, TU Delft, The Netherlands
| | - Giuliana Ferrero
- Water Supply, Sanitation and Environmental Engineering Department, IHE Delft Institute for Water Education, The Netherlands
| | - Gertjan Medema
- Faculty of Civil Engineering and Geosciences, Water Management Department, TU Delft, The Netherlands; KWR Watercycle Research Institute, The Netherlands; Michigan State University, Michigan, USA
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18
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van Genuchten CM, Ahmad A. Groundwater As Removal by As(III), Fe(II), and Mn(II) Co-Oxidation: Contrasting As Removal Pathways with O 2, NaOCl, and KMnO 4. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:15454-15464. [PMID: 33174730 DOI: 10.1021/acs.est.0c05424] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Effective arsenic (As) removal from groundwater is a pressing need in view of increasingly stringent As drinking water limits in some US states and European countries. In this study, we compared the addition of weak (O2), intermediate (NaOCl), and strong (KMnO4) groundwater oxidants on the fate of As during As(III), Fe(II), and Mn(II) co-oxidation. Experiments were performed with 50 μg/L As(III), 5 mg/L Fe(II), and 0.5 mg/L Mn(II) in solutions containing relevant groundwater ions, with the reaction products characterized by As K-edge X-ray absorption spectroscopy (XAS). Adding O2 by aeration was the least effective method, unable to decrease As to below 10 μg/L, which was attributed to inefficient As(III) oxidation. Dosing NaOCl (55 μM) consistently removed As to <10 μg/L (and often <5 μg/L). The As K-edge XAS data of the NaOCl samples indicated complete As(III) oxidation and As(V) sorption to coprecipitated hydrous ferric oxide (HFO) in the binuclear, bridging (2C) complex. The most effective As removal was observed with KMnO4 (40 μM), which completely oxidized As(III) and yielded residual As concentrations that were less than (by as much as 50%) or equal to the NaOCl experiments. Furthermore, the average As-metal bond length of the KMnO4 solids (RAs-Fe/Mn = 3.24 ± 0.02 Å) was systematically shorter than the NaOCl solids (RAs-Fe/Mn = 3.29 ± 0.02 Å), consistent with As(V) sorption to both MnO2 and HFO. These findings can be used to optimize groundwater As treatment to meet relevant drinking water guidelines, while considering the As uptake mode and characteristics of the particle suspension (i.e., colloidal stability and filterability).
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Affiliation(s)
- Case M van Genuchten
- Department of Geochemistry, Geological Survey of Denmark and Greenland (GEUS), Øster Voldgade 10, 1350 Copenhagen, Denmark
| | - Arslan Ahmad
- SIBELCO Ankerpoort NV, Op de Bos 300, 6223 EP Maastricht, The Netherlands
- KWR Water Cycle Research Institute, Groningenhaven 7, 3433 PE Nieuwegein, The Netherlands
- Department of Environmental Technology, Wageningen University and Research (WUR), Droevendaalsesteeg 4, 6708 PB Wageningen, The Netherlands
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19
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Catrouillet C, Hirosue S, Manetti N, Boureau V, Peña J. Coupled As and Mn Redox Transformations in an Fe(0) Electrocoagulation System: Competition for Reactive Oxidants and Sorption Sites. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:7165-7174. [PMID: 32364715 DOI: 10.1021/acs.est.9b07099] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Iron electrocoagulation (EC) can be used for the decentralized treatment of arsenic(As)-contaminated groundwater. Iron EC involves the electrolytic dissolution of an Fe(0) electrode to Fe(II). This process produces reactive oxidants, which oxidize As(III) and Fe(II) to As(V) and a range of Fe(III) (oxyhydr)oxide phases. Here, we investigated the impact of manganese (Mn) on As removal, since the two often co-occur in groundwater. In the absence of Mn(II), we observed rapid As(III) oxidation and the formation of As(V)-Fe(III) polymers. Arsenic removal was achieved upon aggregation of the As(V)-Fe(III) polymers. In the presence of Mn, the mechanism of As removal varied with pH. At pH 4.5, As(III) was oxidized rapidly by OH• and the aggregation of the resulting As(V)-Fe(III) polymers was enhanced by the presence of Mn. At pH 8.5, As(III) and Mn(II) competed for Fe(IV), which led As(III) to persist in solution. The As(V) that did form was incorporated into a mixture of As(V)-Fe(III) polymers and a ferrihydrite-like phase that incorporated 8% Mn(III); some As(III) was also sorbed by these phases. At intermediate pH values, As(III) and Mn(II) also competed for the oxidants, but Mn(III) behaved as a reactive intermediate that reacted with Fe(II) or As(III). This result can explain the presence of As(V) in the solid phase. This detailed understanding of the As removal mechanisms in the presence of Mn can be used to tune the operating conditions of Fe EC for As removal under typical groundwater conditions.
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Affiliation(s)
- Charlotte Catrouillet
- Institute of Earth Surface Dynamics, University of Lausanne, Lausanne CH-1015, Switzerland
| | - Sachiko Hirosue
- Institute of Earth Surface Dynamics, University of Lausanne, Lausanne CH-1015, Switzerland
| | - Nathalie Manetti
- Institute of Earth Surface Dynamics, University of Lausanne, Lausanne CH-1015, Switzerland
| | - Victor Boureau
- Interdisciplinary Center for Electron Microscopy, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
| | - Jasquelin Peña
- Institute of Earth Surface Dynamics, University of Lausanne, Lausanne CH-1015, Switzerland
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20
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Xie S, Shao W, Zhan H, Wang Z, Ge C, Li Q, Fu W. Cu(II)-EDTA removal by a two-step Fe(0) electrocoagulation in near natural water: Sequent transformation and oxidation of EDTA complexes. JOURNAL OF HAZARDOUS MATERIALS 2020; 392:122473. [PMID: 32193116 DOI: 10.1016/j.jhazmat.2020.122473] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Revised: 03/01/2020] [Accepted: 03/04/2020] [Indexed: 06/10/2023]
Abstract
The widely usage of ethylenediaminetetraacetic acid (EDTA) arises environmental concerns on toxic metal mobilization, and challenges the conventional processes in water treatment. In the study Cu(II)-EDTA in near natural water was efficiently removed during a two-step electrocoagulation using Fe(0) anode (Fe-EC), including a transformation to Fe(III)-EDTA induced mainly by structural Fe(II) in anoxic Fe-EC and further degradation in oxic Fe-EC. The degradation of Fe(III)-EDTA was mostly attributed to an oxygen activation mechanism that involving O2- and hydroxyl radical (OH) generation, as validated by the quenching experiments and electron spin resonance. Furthermore, O2- generated during Fe(II) oxidation took a dominant role on Fe(III)/Fe(II)-EDTA transformation instead of electrochemical reduction. Six intermediates during the Fe(III)-EDTA degradation were identified by LC-Q-TOF, indicating a pathway of stepwise breakage of NC bonds. The results revealed in this work is helpful to understand the contribution and fate of EDTA during Fe-EC treatment of metal-EDTA polluted water.
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Affiliation(s)
- Shiwei Xie
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, PR China.
| | - Wei Shao
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, PR China
| | - Hui Zhan
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, PR China
| | - Zheng Wang
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, PR China
| | - Chengcheng Ge
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, PR China
| | - Qingjie Li
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, PR China
| | - Wenjing Fu
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, PR China
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21
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Long Q, Liu F, Yuan Y, Dai Y, Wang C, Li X, Zhang J. Enhanced degradation performance of p-chlorophenol in photo-Fenton reaction activated by nano-Fe0 encapsulated in hydrothermal carbon: Improved Fe(III)/Fe(II) cycle. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.124650] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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22
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He J, Miller CJ, Collins R, Wang D, Waite TD. Production of a Surface-Localized Oxidant during Oxygenation of Mackinawite (FeS). ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:1167-1176. [PMID: 31858783 DOI: 10.1021/acs.est.9b03975] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The oxygenation of mackinawite (FeS) frequently occurs at anoxic-oxic interfaces in both natural and engineered systems such as intertidal sediment, in activated sludge in water treatment processes, and during sulfidized zero-valent iron particle corrosion. During reoxygenation events, FeS may drive a Fenton-like process leading to the production of strong oxidants though the details of this process are poorly understood. In this study, benzoic acid (BA) has been used to probe both the magnitude and identity of these strong oxidants under circumneutral pH conditions. The major product of BA oxidation during FeS oxygenation was found to be 2,5-dihydroxybenzoic acid (2,5-DHBA) rather than monohydroxybenzoic acids identified to be the major products in a range of hydroxyl radical (HO·)-dominated systems. Based upon relative reactivity with other competitive probes and nature of the hydroxybenzoate product distribution, it is hypothesized that the strong oxidant must be a surface-localized entity such as high-valent iron or surface-associated hydroxyl or sulfur-based radicals with reactivity differing from those formed in free solution. The importance of both the reactivity of the oxidant and adsorption of the substrate to the surface is demonstrated.
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Affiliation(s)
- Jie He
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , China
- UNSW Water Research Centre School of Civil and Environmental Engineering , UNSW , Sydney , NSW 2052 , Australia
| | - Christopher J Miller
- UNSW Water Research Centre School of Civil and Environmental Engineering , UNSW , Sydney , NSW 2052 , Australia
| | - Richard Collins
- UNSW Water Research Centre School of Civil and Environmental Engineering , UNSW , Sydney , NSW 2052 , Australia
| | - Dongsheng Wang
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , China
| | - T David Waite
- UNSW Water Research Centre School of Civil and Environmental Engineering , UNSW , Sydney , NSW 2052 , Australia
- Shanghai Institute of Pollution Control and Ecological Security, School of Environmental Science and Engineering , Tongji University , Shanghai 200092 , P. R. China
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23
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Ahmad A, van der Wens P, Baken K, de Waal L, Bhattacharya P, Stuyfzand P. Arsenic reduction to <1 µg/L in Dutch drinking water. ENVIRONMENT INTERNATIONAL 2020; 134:105253. [PMID: 31810053 DOI: 10.1016/j.envint.2019.105253] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Revised: 10/07/2019] [Accepted: 10/08/2019] [Indexed: 05/12/2023]
Abstract
Arsenic (As) is a highly toxic element which naturally occurs in drinking water. In spite of substantial evidence on the association between many illnesses and chronic consumption of As, there is still a considerable uncertainty about the health risks due to low As concentrations in drinking water. In the Netherlands, drinking water companies aim to supply water with As concentration of <1 μg/L - a water quality goal which is tenfold more stringent than the current WHO guideline. This paper provides (i) an account on the assessed lung cancer risk for the Dutch population due to pertinent low-level As in drinking water and cost-comparison between health care provision and As removal from water, (ii) an overview of As occurrence and mobility in drinking water sources and water treatment systems in the Netherlands and (iii) insights into As removal methods that have been employed or under investigation to achieve As reduction to <1 µg/L at Dutch water treatment plants. Lowering of the average As concentration to <1μg/L in the Netherlands is shown to result in an annual benefit of 7.2-14 M€. This study has a global significance for setting drinking water As limits and provision of safe drinking water.
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Affiliation(s)
- Arslan Ahmad
- KWR Water Cycle Research Institute, Nieuwegein, the Netherlands; KTH-International Groundwater Arsenic Research Group, Department of Sustainable Development, Environmental Science and Engineering, KTH Royal Institute of Technology, Stockholm, Sweden; Department of Environmental Technology, Wageningen University and Research (WUR), Wageningen, the Netherlands; Evides Water Company N.V. Rotterdam, the Netherlands.
| | | | - Kirsten Baken
- KWR Water Cycle Research Institute, Nieuwegein, the Netherlands
| | - Luuk de Waal
- KWR Water Cycle Research Institute, Nieuwegein, the Netherlands
| | - Prosun Bhattacharya
- KTH-International Groundwater Arsenic Research Group, Department of Sustainable Development, Environmental Science and Engineering, KTH Royal Institute of Technology, Stockholm, Sweden.
| | - Pieter Stuyfzand
- KWR Water Cycle Research Institute, Nieuwegein, the Netherlands; Department of Geoscience and Engineering, Technical University Delft, the Netherlands
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24
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Qian A, Yuan S, Xie S, Tong M, Zhang P, Zheng Y. Oxidizing Capacity of Iron Electrocoagulation Systems for Refractory Organic Contaminant Transformation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:12629-12638. [PMID: 31603317 DOI: 10.1021/acs.est.9b03754] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Iron electrocoagulation (Fe EC) is normally considered as a separation process. Here, we found that Fe(II)-O2 interactions in Fe EC systems could produce reactive oxidants, mainly hydroxyl radicals (•OH), for refractory organic contaminant transformation. Production of reactive oxidants, probed by benzoate conversion to p-hydroxybenzoic acid (p-HBA), depended on dissolved oxygen (DO) concentration and Fe(II) speciation. Measurable levels of DO were required for significant p-HBA production. Fe precipitates evolved from lepidocrocite to magnetite when DO decreased to below the detection limit. Both experiments and kinetic modeling suggest that the main Fe(II) species contributing to reactive oxidants (mainly •OH) production changed from aqueous Fe(II) initially to lepidocrocite-sorbed Fe(II) with progressive precipitates formation. When DO was not measurable at high currents (≥50 mA or 100 mA/L), reactive oxidant production was ineffective because of pH rise and Fe(II) preservation in magnetite, but it could be enhanced drastically by aeration. The reactive oxidants produced at 30 mA (or 60 mA/L) could degrade about 47% of 10 μM aniline and 34% of sulfanilamide within 6 h of Fe EC treatment. Our findings highlight the importance of reactive oxidants for refractory organic contaminants oxidation in Fe EC systems.
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Affiliation(s)
- Ao Qian
- State Key Laboratory of Biogeology and Environmental Geology , China University of Geosciences , 388 Lumo Road , Wuhan 430074 , P. R. China
| | - Songhu Yuan
- State Key Laboratory of Biogeology and Environmental Geology , China University of Geosciences , 388 Lumo Road , Wuhan 430074 , P. R. China
| | - Shiwei Xie
- School of Urban Construction , Wuhan University of Science and Technology , Wuhan 430065 , P. R. China
| | - Man Tong
- State Key Laboratory of Biogeology and Environmental Geology , China University of Geosciences , 388 Lumo Road , Wuhan 430074 , P. R. China
| | - Peng Zhang
- State Key Laboratory of Biogeology and Environmental Geology , China University of Geosciences , 388 Lumo Road , Wuhan 430074 , P. R. China
| | - Yunsong Zheng
- State Key Laboratory of Biogeology and Environmental Geology , China University of Geosciences , 388 Lumo Road , Wuhan 430074 , P. R. China
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25
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van Genuchten CM, Behrends T, Dideriksen K. Emerging investigator series: interdependency of green rust transformation and the partitioning and binding mode of arsenic. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2019; 21:1459-1476. [PMID: 31353376 DOI: 10.1039/c9em00267g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We investigated the impact of aging-induced structural modifications of carbonate green rust (GR), a mixed valent Fe(ii,iii) (hydr)oxide with a high oxyanion sorption affinity, on the partitioning and binding mode of arsenic (As). Suspensions of carbonate GR were produced in the presence of As(v) or As(iii) (i.e. co-precipitated with As(iii) or As(v)) and aged in anoxic and oxic conditions for up to a year. We tracked aqueous As over time and characterized the solid phase by X-ray absorption spectroscopy (XAS). In experiments with initial As(v) (4500 μg L-1, As/Fe = 2 mol%), the fresh GR suspension sorbed >99% of the initial As, resulting in approximately 14 ± 8 μg L-1 residual dissolved As. Anoxic aging of the As(v)-laden GR for a month increased aqueous As to >60 μg L-1, which was coupled to an increase in GR structural order revealed by Fe K-edge XAS. Further anoxic aging up to a year transformed As(v)-laden GR into magnetite and decreased significantly the aqueous As to <2 μg L-1. The As binding mode was also modified during GR transformation to magnetite from sorption to GR particle edges to As substitution for tetrahedral Fe in the magnetite structure. These GR structural modifications altered the ratio of As partitioning to the solid (μg As/mg Fe) and liquid (μg As per L) phase from 2.0 to 0.4 to 14 L mg-1 for the fresh, month, and year aged suspensions, respectively. Similar trends in GR transformation and As partitioning during anoxic aging were observed for As(iii)-laden suspensions, but occurred on more rapid timescales: As(iii)-laden GR transformed to magnetite after a day of anoxic aging. In oxic aging experiments, rapid GR oxidation by dissolved oxygen to Fe(iii) precipitates required only an hour for both As(v) and As(iii) experiments, with lepidocrocite favored in As(v) experiments and hydrous ferric oxide favored in As(iii) experiments. Aqueous As during GR oxidation decreased to <10 μg L-1 for both As(v) and As(iii) series. Knowledge of this interdependence between GR aging products and oxyanion fate improves biogeochemical models of contaminant and nutrient dynamics during Fe cycling and can be used to design more effective arsenic remediation strategies that rely on arsenic sorption to GR.
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Affiliation(s)
- C M van Genuchten
- Geological Survey of Denmark and Greenland (GEUS), Copenhagen, Denmark.
- Department of Earth Sciences - Geochemistry, Faculty of Geosciences, Utrecht University, Utrecht, The Netherlands
| | - T Behrends
- Department of Earth Sciences - Geochemistry, Faculty of Geosciences, Utrecht University, Utrecht, The Netherlands
| | - K Dideriksen
- Geological Survey of Denmark and Greenland (GEUS), Copenhagen, Denmark.
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26
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Ahmad A, van der Wal A, Bhattacharya P, van Genuchten CM. Characteristics of Fe and Mn bearing precipitates generated by Fe(II) and Mn(II) co-oxidation with O 2, MnO 4 and HOCl in the presence of groundwater ions. WATER RESEARCH 2019; 161:505-516. [PMID: 31229731 DOI: 10.1016/j.watres.2019.06.036] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 06/06/2019] [Accepted: 06/13/2019] [Indexed: 06/09/2023]
Abstract
In this work, we combined macroscopic measurements of precipitate aggregation and chemical composition (Mn/Fe solids ratio) with Fe and Mn K-edge X-ray absorption spectroscopy to investigate the solids formed by co-oxidation of Fe(II) and Mn(II) with O2, MnO4, and HOCl in the presence of groundwater ions. In the absence of the strongly sorbing oxyanions, phosphate (P) and silicate (Si), and calcium (Ca), O2 and HOCl produced suspensions that aggregated rapidly, whereas co-oxidation of Fe(II) and Mn(II) by MnO4 generated colloidally stable suspensions. The aggregation of all suspensions decreased in P and Si solutions, but Ca counteracted these oxyanion effects. The speciation of oxidized Fe and Mn in the absence of P and Si also depended on the oxidant, with O2 producing Mn(III)-incorporated lepidocrocite (Mn/Fe = 0.01-0.02 mol/mol), HOCl producing Mn(III)-incorporated hydrous ferric oxide (HFO) (Mn/Fe = 0.08 mol/mol), and MnO4 producing poorly-ordered MnO2 and HFO (Mn/Fe > 0.5 mol/mol). In general, the presence of P and Si decreased the crystallinity of the Fe(III) phase and increased the Mn/Fe solids ratio, which was found by Mn K-edge XAS analysis to be due to an increase in surface-bound Mn(II). By contrast, Ca decreased the Mn/Fe solids ratio and decreased the fraction of Mn(II) associated with the solids, suggesting that Ca and Mn(II) compete for sorption sites. Based on these results, we discuss strategies to optimize the design (i.e. filter bed operation and chemical dosing) of water treatment plants that aim to remove Fe(II) and Mn(II) by co-oxidation.
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Affiliation(s)
- Arslan Ahmad
- KWR Water Cycle Research Institute, Nieuwegein, the Netherlands; KTH-International Groundwater Arsenic Research Group, Department of Sustainable Development, Environmental Science and Engineering, KTH Royal Institute of Technology, Stockholm, Sweden; Department of Environmental Technology, Wageningen University and Research (WUR), Wageningen, the Netherlands; Evides Water Company, N.V. Rotterdam, the Netherlands.
| | - Albert van der Wal
- Department of Environmental Technology, Wageningen University and Research (WUR), Wageningen, the Netherlands; Evides Water Company, N.V. Rotterdam, the Netherlands
| | - Prosun Bhattacharya
- KTH-International Groundwater Arsenic Research Group, Department of Sustainable Development, Environmental Science and Engineering, KTH Royal Institute of Technology, Stockholm, Sweden; International Centre for Applied Climate Science, University of Southern Queensland, Toowoomba, Australia
| | - Case M van Genuchten
- Geochemical Department, Geological Survey of Denmark and Greenland (GEUS), Copenhagen, Denmark; Department of Earth Sciences-Geochemistry, Faculty of Geosciences, Utrecht University, Utrecht, the Netherlands.
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Liu W, Sun B, Qiao J, Guan X. Influence of Pyrophosphate on the Generation of Soluble Mn(III) from Reactions Involving Mn Oxides and Mn(VII). ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:10227-10235. [PMID: 31408326 DOI: 10.1021/acs.est.9b03456] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The detection of soluble Mn(III) is typically accomplished using strong complexing agents to trap Mn(III), but the generation of soluble Mn(III) induced by strong complexing agents has seldom been considered. In this study, pyrophosphate (PP), a nonredox active ligand, was chosen as a typical Mn(III) chelating reagent to study the influence of ligands on soluble Mn(III) formation in reactions involving Mn oxides and Mn(VII). The presence of excess PP induced the generation of soluble Mn(III)-PP from α- and δ-MnO2 and led to the conproportionation reaction of α-, β-, δ-, or colloidal MnO2 with Mn(II) at pH 7.0. Compared to MnO2 minerals, colloidal MnO2 showed much higher reactivity toward Mn(II) in the presence of PP and the conproportionation rate of colloidal MnO2 with Mn(II) elevated with increasing PP dosage and decreasing pH. The generation of Mn(III) was not observed in MnO4-/S2O32- or MnO4-/NH3OH+ system without PP while the introduction of excess PP induced the generation of Mn(III)-PP. Thermodynamic calculation results were consistent with the experimental observations. These findings not only provide evidence for the unsuitability of using strong ligands in quantification of soluble Mn(III) in manganese-involved redox reactions, but also advance the understanding of soluble Mn(III) generation in aquatic environment.
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Affiliation(s)
- Weifan Liu
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering , Tongji University , Shanghai 200092 , P. R. China
- Shanghai Institute of Pollution Control and Ecological Security , Shanghai 200092 , P. R. China
| | - Bo Sun
- Department of Civil and Environmental Engineering , The Hong Kong University of Science and Technology , Clear Water Bay , Kowloon , Hong Kong
| | - Junlian Qiao
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering , Tongji University , Shanghai 200092 , P. R. China
- Shanghai Institute of Pollution Control and Ecological Security , Shanghai 200092 , P. R. China
- International Joint Research Center for Sustainable Urban Water System , Tongji University , Shanghai 200092 , P. R. China
| | - Xiaohong Guan
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering , Tongji University , Shanghai 200092 , P. R. China
- Shanghai Institute of Pollution Control and Ecological Security , Shanghai 200092 , P. R. China
- International Joint Research Center for Sustainable Urban Water System , Tongji University , Shanghai 200092 , P. R. China
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28
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Soares DG, Marcomini N, Duque CCDO, Bordini EAF, Zuta UO, Basso FG, Hebling J, Costa CADS. Increased whitening efficacy and reduced cytotoxicity are achieved by the chemical activation of a highly concentrated hydrogen peroxide bleaching gel. J Appl Oral Sci 2019; 27:e20180453. [PMID: 31411261 DOI: 10.1590/1678-7757-2018-0453] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Accepted: 11/28/2018] [Indexed: 12/15/2022] Open
Abstract
OBJECTIVE This study was designed for the chemical activation of a 35% hydrogen peroxide (H2O2) bleaching gel to increase its whitening effectiveness and reduce its toxicity. METHODOLOGY First, the bleaching gel - associated or not with ferrous sulfate (FS), manganese chloride (MC), peroxidase (PR), or catalase (CT) - was applied (3x 15 min) to enamel/dentin discs adapted to artificial pulp chambers. Then, odontoblast-like MDPC-23 cells were exposed for 1 h to the extracts (culture medium + components released from the product), for the assessment of viability (MTT assay) and oxidative stress (H2DCFDA). Residual H2O2 and bleaching effectiveness (DE) were also evaluated. Data were analyzed with one-way ANOVA complemented with Tukey's test (n=8. p<0.05). RESULTS All chemically activated groups minimized MDPC-23 oxidative stress generation; however, significantly higher cell viability was detected for MC, PR, and CT than for plain 35% H2O2 gel. Nevertheless, FS, MC, PR, and CT reduced the amount of residual H2O2 and increased bleaching effectiveness. CONCLUSION Chemical activation of 35% H2O2 gel with MC, PR, and CT minimized residual H2O2 and pulp cell toxicity; but PR duplicated the whitening potential of the bleaching gel after a single 45-minute session.
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Affiliation(s)
- Diana Gabriela Soares
- Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Dentística, Endodontia e Materiais Odontológicos, Bauru, São Paulo, Brasil
| | - Natália Marcomini
- Universidade Estadual Paulista - UNESP, Faculdade de Odontologia de Araraquara, Departamento de Dentística Restauradora, Araraquara, São Paulo, Brasil
| | - Carla Caroline de Oliveira Duque
- Universidade Estadual Paulista - UNESP, Faculdade de Odontologia de Araraquara, Departamento de Materiais Dentários e Prótese, Araraquara, São Paulo, Brasil
| | - Ester Alves Ferreira Bordini
- Universidade Estadual Paulista - UNESP, Faculdade de Odontologia de Araraquara, Departamento de Materiais Dentários e Prótese, Araraquara, São Paulo, Brasil
| | - Uxua Ortecho Zuta
- Universidade Estadual Paulista - UNESP, Faculdade de Odontologia de Araraquara, Departamento de Materiais Dentários e Prótese, Araraquara, São Paulo, Brasil
| | - Fernanda Gonçalves Basso
- Universidade Estadual Paulista - UNESP, Faculdade de Odontologia de Araraquara, Departamento de Fisiologia e Patologia, Araraquara, São Paulo, Brasil
| | - Josimeri Hebling
- Universidade Estadual Paulista - UNESP, Faculdade de Odontologia de Araraquara, Departamento de Clínica Infantil, Araraquara, São Paulo, Brasil
| | - Carlos Alberto de Souza Costa
- Universidade Estadual Paulista - UNESP, Faculdade de Odontologia de Araraquara, Departamento de Fisiologia e Patologia, Araraquara, São Paulo, Brasil
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29
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Rao D, Sun Y, Shao B, Qiao J, Guan X. Activation of oxygen with sulfite for enhanced Removal of Mn(II): The involvement of SO 4•. WATER RESEARCH 2019; 157:435-444. [PMID: 30978665 DOI: 10.1016/j.watres.2019.03.095] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Revised: 03/20/2019] [Accepted: 03/30/2019] [Indexed: 06/09/2023]
Abstract
Taking advantage of the active oxidants generated in the process of Mn(II)-catalyzed sulfite oxidation by oxygen, this study sought to enhance Mn(II) removal from water by activating oxygen with sulfite. The results revealed that Mn(II) can be effectively oxidized by oxygen to MnO2 with the addition of sulfite under environmentally relevant conditions, and the performance of this process is dependent on the dosage of sulfite and the initial pH. Mn K-edge XANES analysis indicates that Mn(II) removal is primarily due to the transformation of Mn(II) to MnO2 and, secondarily, to the adsorption of Mn(II) on generated MnO2. Co-existing NaCl and CaCl2 negatively affect Mn(II) removal, while the presence of Fe(II) considerably enhances Mn(II) removal by improving both Mn(II) oxidation and Mn(II) adsorption on the generated solids. Consequently, Mn(II) removal is as high as 98% in the presence of 1.0 mg/L of Fe(II) and both the residual Mn (<0.1 mg/L Mn) and Fe (<0.3 mg/L Fe) can meet China's drinking water standard. The experiments with real water samples also demonstrate the effectiveness of the sulfite-promoted Mn(II) removal process, especially in the presence of Fe(II). The enhancing effect of sulfite on Mn(II) oxidation by oxygen is mainly associated with the generation of HSO5-, and the critical step for generating HSO5- is the rapid oxidation of SO3•- by oxygen. EPR and radical scavenging studies demonstrate that SO4•- radical is the key reactive oxygen species responsible for Mn(II) oxidation by HSO5-.
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Affiliation(s)
- Dandan Rao
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Yuankui Sun
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Binbin Shao
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Junlian Qiao
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China; International Joint Research Center for Sustainable Urban Water System, Tongji University, Shanghai, 200092, China
| | - Xiaohong Guan
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China; International Joint Research Center for Sustainable Urban Water System, Tongji University, Shanghai, 200092, China.
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30
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Li G, Hao H, Zhuang Y, Wang Z, Shi B. Powdered activated carbon enhanced Manganese(II) removal by chlorine oxidation. WATER RESEARCH 2019; 156:287-296. [PMID: 30925375 DOI: 10.1016/j.watres.2019.03.027] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Revised: 02/24/2019] [Accepted: 03/15/2019] [Indexed: 06/09/2023]
Abstract
Chlorine is not effective in the oxidative removal of soluble manganese(II) ions at neutral pH. Powdered activated carbon (PAC) also has a very limited capacity for Mn(II) removal through adsorption in drinking water treatment practice. This study explored the combined use of PAC and chlorine for Mn(II) removal and found that PAC dramatically catalyzed Mn(II) oxidation by chlorine under diverse conditions. At a dose as low as 5.0 mg/L, two different commercial PACs increased Mn(II) oxidation rate by two orders of magnitude respectively and reduced Mn(II) concentration from 200 μg/L to < 10 μg/L in tens of minutes. First-order kinetics with respect to aqueous Mn(II) concentration were observed. Typically, homogeneous Mn(II) oxidation by chlorine depends strongly on alkaline pH. In the presence of PAC, however, the reaction was still rather fast at pH 6.0. Increasing PAC doses linearly increased Mn(II) oxidation rate, indicating that the reaction was highly PAC surface active sites dependent. The efficacy of PAC was further corroborated in removing Mn(II) from natural water. SEM-EDS and XPS demonstrated that a MnO2 coating was formed on PAC surface after reaction, which resulted from heterogeneous oxidation of Mn(II) on PAC surface rather than the precipitation of Mn oxides formed through homogeneous oxidation in solution. Adsorption of free Mn(II) ions onto PAC surface was proved to directly correlate with Mn(II) oxidation rate. Two kinds of electron transfer pathways from adsorbed Mn(II) species to chlorine, enhanced by surface-complexation and electrically-conductive carbon surface respectively, were hypothesized.
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Affiliation(s)
- Guiwei Li
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Haotian Hao
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Yuan Zhuang
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Ziqiao Wang
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Baoyou Shi
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
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Wang L, Yan D, Lyu L, Hu C, Jiang N, Zhang L. Notable light-free catalytic activity for pollutant destruction over flower-like BiOI microspheres by a dual-reaction-center Fenton-like process. J Colloid Interface Sci 2018; 527:251-259. [DOI: 10.1016/j.jcis.2018.05.055] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Revised: 05/13/2018] [Accepted: 05/18/2018] [Indexed: 01/15/2023]
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Charbonnet JA, Duan Y, van Genuchten CM, Sedlak DL. Chemical Regeneration of Manganese Oxide-Coated Sand for Oxidation of Organic Stormwater Contaminants. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:10728-10736. [PMID: 30160107 DOI: 10.1021/acs.est.8b03304] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Urban stormwater, municipal wastewater effluent, and agricultural runoff contain trace amounts of organic contaminants that can compromise water quality. To provide a passive, low-cost means of oxidizing substituted phenols, aromatic amines, and other electron-rich organic compounds during infiltration of contaminated waters, we coated sand with manganese oxide using a new approach involving the room-temperature oxidation of Mn2+ with permanganate. Manganese oxide-coated sand effectively oxidized bisphenol A under typical infiltration conditions and sustained reactivity longer than previously described geomedia. Because geomedia reactivity decreased after extended operation, chlorine was evaluated for use as an in situ geomedia regenerant. Geomedia regenerated by HOCl demonstrated similar reactivity and longevity to that of virgin geomedia. Chemical analyses indicated that the average manganese oxidation state of the coatings decreased as the geomedia passivated. X-ray absorption spectroscopy and X-ray diffraction showed that the reactive virgin and regenerated geomedia coatings had nanocrystalline manganese oxide structures, whereas the failed geomedia coating exhibited greater crystallinity and resembled cryptomelane. These results suggest that it is possible to regenerate the oxidative capacity of manganese oxide-coated sands without excavating stormwater infiltration systems. These results also suggest that manganese oxide geomedia may be a cost-effective means of treating urban stormwater and other contaminated waters.
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Affiliation(s)
- Joseph A Charbonnet
- National Science Foundation Engineering Research Center for Reinventing the Nation's Urban Water Infrastructure (ReNUWIt) and Department of Civil & Environmental Engineering , University of California at Berkeley , Berkeley , California 94720 , United States
| | - Yanghua Duan
- National Science Foundation Engineering Research Center for Reinventing the Nation's Urban Water Infrastructure (ReNUWIt) and Department of Civil & Environmental Engineering , University of California at Berkeley , Berkeley , California 94720 , United States
| | - Case M van Genuchten
- Department of Earth Sciences, Geochemistry, Faculty of Geosciences , Utrecht University , Utrecht 3508TA , The Netherlands
| | - David L Sedlak
- National Science Foundation Engineering Research Center for Reinventing the Nation's Urban Water Infrastructure (ReNUWIt) and Department of Civil & Environmental Engineering , University of California at Berkeley , Berkeley , California 94720 , United States
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Si Y, Li G, Wu Y, Zhang H, Yuan Y, Zhang H, Liu B, Zhang F. Tradeoff between groundwater arsenite removal efficiency and current production in the self-powered air cathode electrocoagulation with different oxygen reduction pathways. JOURNAL OF HAZARDOUS MATERIALS 2018; 357:138-145. [PMID: 29879632 DOI: 10.1016/j.jhazmat.2018.05.048] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 05/22/2018] [Accepted: 05/23/2018] [Indexed: 06/08/2023]
Abstract
Naturally occurring arsenic enrichment in aquifers posts a huge threat to drinking water safety. To achieve energy-efficient arsenite [As(III)] removal, a self-powered iron electrocoagulation was developed that coupled iron corrosion anode with oxygen reduction air cathode for simultaneous As(III) oxidation and removal. Activated carbon (AC), which favored the four-electron oxygen reduction reaction (ORR, O2+4e-+4H+→2H2O, E0' = 0.816 V), and carbon black (CB), which favored two-electron ORR (O2+2e-+2H+→H2O2, E0' = 0.283 V), were evaluated for As(III) removal efficiency and current production performance. The comparison showed a tradeoff between higher current (i.e., higher iron corrosion rate) attributed to the higher reduction potential with four-electron ORR, and higher H2O2 production for improved As(III) oxidation with two-electron ORR yet the lower reduction potential The CB cathode that favored H2O2 production had the best As(III) removal of 99.2 ± 0.4% and the lowest maximum power density of 60 ± 0.3 mW m-2, while the AC cathode showed the opposite trend. These results suggested that cathode catalysts need to be carefully evaluated for the balance of As(III) removal and current production to provide a sustainable and effective solution for groundwater As(III) removal.
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Affiliation(s)
- Yanxiao Si
- School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China; Key Laboratory of Solid Waste Management and Environment Safety (Tsinghua University), Ministry of Education, Beijing, 100084, China
| | - Guanghe Li
- School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China; Key Laboratory of Solid Waste Management and Environment Safety (Tsinghua University), Ministry of Education, Beijing, 100084, China
| | - Yue Wu
- School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China; Key Laboratory of Solid Waste Management and Environment Safety (Tsinghua University), Ministry of Education, Beijing, 100084, China
| | - Hao Zhang
- School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China; Key Laboratory of Solid Waste Management and Environment Safety (Tsinghua University), Ministry of Education, Beijing, 100084, China
| | - Ying Yuan
- School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China; Key Laboratory of Solid Waste Management and Environment Safety (Tsinghua University), Ministry of Education, Beijing, 100084, China
| | - Haichuan Zhang
- School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China; Key Laboratory of Solid Waste Management and Environment Safety (Tsinghua University), Ministry of Education, Beijing, 100084, China
| | - Bo Liu
- School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China; Key Laboratory of Solid Waste Management and Environment Safety (Tsinghua University), Ministry of Education, Beijing, 100084, China
| | - Fang Zhang
- School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China; Key Laboratory of Solid Waste Management and Environment Safety (Tsinghua University), Ministry of Education, Beijing, 100084, China.
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Wang N, Chen J, Zhao Q, Xu H. Study on preparation conditions of coal fly ash catalyst and catalytic mechanism in a heterogeneous Fenton-like process. RSC Adv 2017. [DOI: 10.1039/c7ra09925h] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The heterogeneous Fenton-like process catalyzed by H2SO4-modified coal fly ash can treat organic wastewater effectively.
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Affiliation(s)
- Nannan Wang
- School of Mechanical Engineering
- Beijing Institute of Petrochemical Technology
- Beijing 102617
- PR China
- Beijing Key Laboratory of Pipeline Critical Technology and Equipment for Deepwater Oil & Gas Development
| | - Jiaqing Chen
- School of Mechanical Engineering
- Beijing Institute of Petrochemical Technology
- Beijing 102617
- PR China
- Beijing Key Laboratory of Pipeline Critical Technology and Equipment for Deepwater Oil & Gas Development
| | - Qiang Zhao
- Beijing BHT Environment Technology Co., Ltd
- Beijing 100102
- PR China
| | - Han Xu
- School of Mechanical Engineering
- Beijing Institute of Petrochemical Technology
- Beijing 102617
- PR China
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