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Li W, Xie J, Huang R, Chen W, Du H. Molecular characteristics of dissolved organic matter regulate the binding and migration of tungsten in porous media. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 954:176670. [PMID: 39366568 DOI: 10.1016/j.scitotenv.2024.176670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2024] [Revised: 09/09/2024] [Accepted: 09/30/2024] [Indexed: 10/06/2024]
Abstract
Tungsten (W) is an emerging contaminant that poses potential risks to both the environment and human health. While dissolved organic matter (DOM) can significantly influence the W's environmental behavior in natural aquifers, the mechanisms by which DOM's molecular structure and functional group diversity impact W binding and migration remain unclear. Using molecular weight-fractionated soil and sediment DOM (<1 kDa, 1-100 kDa, and 100 kDa-0.45 μm), this study systematically investigated the relationship between DOM molecular characteristics and tungstate (WO42-) binding properties using multiple spectroscopic methods, including FTIR, fluorescence spectroscopy and XPS. The migration behavior of WO42- in porous media was also investigated through quartz sand column experiments. Results revealed that approximately 75 % of W was controlled by DOM, with over 50 % binding to low molecular weight DOM (<1 kDa). Tungsten bound to medium-high molecular weight DOM (1-100 kDa, >100 kDa) showed a greater propensity for retention, with the >100 kDa fractions demonstrating stronger selective binding to W, exhibiting distribution coefficients (Kmd) of 6.11 L/g and 10.69 L/g, respectively. Further analysis indicated that W primarily binds with aromatic rings, phenolic hydroxyls, polysaccharides, and carboxyl groups in DOM, potentially affecting DOM structural stability and consequently influencing W migration characteristics. Free W migration in quartz sand was primarily controlled by Langmuir monolayer adsorption, leading to local enrichment (Da = 6.83, Rd = 86.98). When bound to DOM, W's migration ability significantly increased (Rd = 8-10), with adsorption shifting to a Freundlich multilayer model, primarily controlled by convective transport (Npe = 27-62> > 1.96), while adsorption effects weakened (Da ≈ 1). This study, for the first time, systematically reveals the regulatory mechanisms of DOM molecular characteristics on tungsten's environmental behavior. It offers crucial parameter support for constructing tungsten migration models and provides important guidance for tungsten pollution risk assessment and remediation strategies.
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Affiliation(s)
- Weijun Li
- College of Environment & Ecology, Hunan Agricultural University, 410127 Changsha, China
| | - Jian Xie
- College of Environment & Ecology, Hunan Agricultural University, 410127 Changsha, China
| | - Rui Huang
- College of Environment & Ecology, Hunan Agricultural University, 410127 Changsha, China
| | - Wei Chen
- School of Metallurgy and Environment, Central South University, 410083 Changsha, China
| | - Huihui Du
- College of Environment & Ecology, Hunan Agricultural University, 410127 Changsha, China.
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Song T, Wang S, Gao W, Zhang C, Xu Y, Lin X, Yang M. Construction of UiO-66-NH 2 decorated by MoS 2 QDs as photocatalyst for rapid and effective visible-light driven Cr(VI) reduction. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 263:115304. [PMID: 37506441 DOI: 10.1016/j.ecoenv.2023.115304] [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: 05/19/2023] [Revised: 07/13/2023] [Accepted: 07/23/2023] [Indexed: 07/30/2023]
Abstract
The photoactive metal-organic frameworks (MOFs) are good candidates for photocatalysts, but the quick electron-hole pairs recombination has greatly restricted the photocatalytic ability of MOFs. To improve the photoactivity of MOFs, MOFs-based composite materials have been extensively studied. Here, we successfully integrated MoS2 quantum dots (QDs) with UiO-66-NH2 for the first time under hydrothermal conditions. The as-prepared MoS2 QDs/UiO-66-NH2 (MS-U) had good visible light response ability (absorption edge at 445 nm), and charge separation and transfer ability, which lays the foundation for the photocatalytic Cr(VI) reduction. Photocatalytic studies revealed that MoS2 QDs-5/UiO-66-NH2 (MS-U-5) had superior Cr(VI) reduction activity than pure MoS2 QDs and UiO-66-NH2. MS-U-5 could remove 98% Cr(VI) at pH= 2 with visible light irradiation for 20 min, which is the fastest visible light driven Cr(VI) reduction rate among the reported MOFs-based composite photocatalysts without the presence of any cocatalysts or scavengers as far as we know. Importantly, MS-U-5 could be reused at least three times. In the end, the possible electron transfer path and mechanism of Cr(VI) reduction was also investigated.
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Affiliation(s)
- Tianqun Song
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, China; Tianjin University of Technology, Tianjin 300384, China; Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, China
| | - Shuang Wang
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, China
| | - Wanting Gao
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, China
| | - Chudi Zhang
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, China
| | - Yixin Xu
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, China
| | - Xin Lin
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, China
| | - Mei Yang
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, China.
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He H, Jiang J, Luo Z, Li D, Shi M, Sun H, Chen J, Chen C, Deng B, Yu C. Novel starfish-like inorganic/organic heterojunction for Cr(Ⅵ) photocatalytic reduction in neutral solution. Colloids Surf A Physicochem Eng Asp 2023. [DOI: 10.1016/j.colsurfa.2023.131357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
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Yang H, Dai K, Zhang J, Dawson G. Inorganic-organic hybrid photocatalysts: Syntheses, mechanisms, and applications. CHINESE JOURNAL OF CATALYSIS 2022. [DOI: 10.1016/s1872-2067(22)64096-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Jafarzadeh M. Recent Progress in the Development of MOF-Based Photocatalysts for the Photoreduction of Cr (VI). ACS APPLIED MATERIALS & INTERFACES 2022; 14:24993-25024. [PMID: 35604855 DOI: 10.1021/acsami.2c03946] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
There has been a direct correlation between the rate of industrial development and the spread of pollution on Earth, particularly in the last century. The organic and inorganic pollutants generated from industrial activities have created serious risks to human life and the environment. The concept of sustainability has emerged to tackle the environmental issues in developing chemical-based industries. However, pollutants have continued to be discharged to water resources, and finding appropriate techniques for the removal and remedy of wastewater is in high demand. Chromium is one of the high-risk heavy metals in industrial wastewaters that should be removed via physical adsorption and/or transformed into less hazardous chemicals. Photocatalysis as a sustainable process has received considerable attention as it utilizes sunlight irradiation to remedy Cr(VI) via a cost-effective process. Numerous photocatalytic systems have been developed up to now, but metal-organic frameworks (MOFs) have gained growing attention because of their unique versatilities and facile structural modulations. A variety of MOF-based photocatalysts have been widely employed for the photoreduction of Cr(VI). Here, we review the recent progress in the design of MOF photocatalysts and summarize their performance in photoreduction reactions.
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Sun C, Zhang Y, Ying J, Jin L, Tian A, Wang X. A series of POM compounds constructed using a flexible ligand containing three coordination groups: electrocatalytic and photocatalytic reduction and amperometric detection of Cr( vi). NEW J CHEM 2022. [DOI: 10.1039/d1nj05316g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Four polyoxometalate-based compounds can be used as electrocatalysts and electrochemical sensors for amperometric detection of NO2− and Cr(VI), and also have the performance of photocatalytic reduction of Cr(VI).
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Affiliation(s)
- Chenxi Sun
- Department of Chemistry, Bohai University, Jinzhou, 121013, P. R. China
| | - Yanping Zhang
- Department of Chemistry, Bohai University, Jinzhou, 121013, P. R. China
| | - Jun Ying
- Department of Chemistry, Bohai University, Jinzhou, 121013, P. R. China
| | - Liang Jin
- Department of Chemistry, Bohai University, Jinzhou, 121013, P. R. China
| | - Aixiang Tian
- Department of Chemistry, Bohai University, Jinzhou, 121013, P. R. China
| | - Xiuli Wang
- Department of Chemistry, Bohai University, Jinzhou, 121013, P. R. China
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Ma Y, Li J, Jin Y, Gao K, Cai H, Ou G. The enhancement mechanism of ultra-active Ag 3PO 4 modified by tungsten and the effective degradation towards phenolic pollutants. CHEMOSPHERE 2021; 285:131440. [PMID: 34252812 DOI: 10.1016/j.chemosphere.2021.131440] [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: 04/09/2021] [Revised: 06/22/2021] [Accepted: 07/03/2021] [Indexed: 05/23/2023]
Abstract
A novel strategy of W modification was applied to overcome the disadvantages of Ag3PO4. Ultra-active Ag3PO4 with different W doping ratios were successfully synthesized by facile chemical precipitation method, among which 0.5%W-AP showed the best results. Meanwhile, the stability and yield were enhanced. XRD, Raman and ESR etc. were employed to investigate the morphology, structure and optical properties of samples. It was proved W6+ entered into the Ag3PO4 lattice, occupied the position of P5+ and doped in the form of WO42-. The significant improvement of photocatalytic performance of W doped Ag3PO4 was attributed to the change of morphology, the decrease of particle size, the increase of crystallinity, the shrink of band gap energy and the reduction of photo-induced carriers recombination rate with W doping. The photocatalytic mechanism analysis showed h+ was the main oxidative species in the photocatalytic process, •O2- and •OH played minor roles. Under visible light irradiation, the impacts of the important operating parameters on the typical phenolic pollutants, phenol and bisphenol A, were evaluated with 0.5%W-AP. It was confirmed that 68% and 82% of phenol and bisphenol A were respectively degraded within 15 min and 40 min under optimized photocatalytic parameters: 0.4 g/L catalyst dosage, 20 mg/L pollutant concentration, pH 5.7 and 125 mW/cm2 irradiation intensity, and the corresponding K' were 2.14 and 5.50 times of undoped samples. This work provides a new approach for effective degradation towards phenolic pollutants by Ag3PO4 with ultra-high photocatalytic activity, high applicability and enhanced stability and yield.
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Affiliation(s)
- Yujing Ma
- Department of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, China; Engineering Research Center for Comprehensive Utilization and Cleaning Process of Phosphate Resource, Ministry of Education, Chengdu, 610065, China
| | - Jun Li
- Department of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, China; Engineering Research Center for Comprehensive Utilization and Cleaning Process of Phosphate Resource, Ministry of Education, Chengdu, 610065, China.
| | - Yang Jin
- Department of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, China; Engineering Research Center for Comprehensive Utilization and Cleaning Process of Phosphate Resource, Ministry of Education, Chengdu, 610065, China
| | - Kaige Gao
- Department of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, China; Engineering Research Center for Comprehensive Utilization and Cleaning Process of Phosphate Resource, Ministry of Education, Chengdu, 610065, China
| | - Haitao Cai
- Department of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, China; Engineering Research Center for Comprehensive Utilization and Cleaning Process of Phosphate Resource, Ministry of Education, Chengdu, 610065, China
| | - Guangyu Ou
- Department of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, China; Engineering Research Center for Comprehensive Utilization and Cleaning Process of Phosphate Resource, Ministry of Education, Chengdu, 610065, China
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Zhou Z, Zhang L, Su W, Li Y, Zhang G. Facile fabrication of AgI/Sb 2O 3 heterojunction photocatalyst with enhanced visible-light driven photocatalytic performance for efficient degradation of organic pollutants in water. ENVIRONMENTAL RESEARCH 2021; 197:111143. [PMID: 33865821 DOI: 10.1016/j.envres.2021.111143] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Revised: 03/29/2021] [Accepted: 03/29/2021] [Indexed: 06/12/2023]
Abstract
The construction of heterojunction is considered as a promising approach to designing highly effective visible-light driven photocatalysts. In this research, the AgI/Sb2O3 heterojunction photocatalyst was synthesized by a simple in situ deposition-precipitation procedure, which was supported by XPS results. Among the prepared samples, the 60% AgI/Sb2O3 samples exhibited the best ARG degradation ratio (98.3%) in 1 h under visible light irradiation, while the pure Sb2O3 and AgI exhibited almost none photocatalytic performance. The trapping experiments and EPR proved that the photo-generated ·O2- and ·OH made major contributions to the photocatalytic degradation of ARG by the 60% AgI/Sb2O3 samples. The enhanced photocatalytic performance of AgI/Sb2O3 heterojunction photocatalysts was ascribed to that the e- produced in the CB of AgI would be transferred to the empty CB of Sb2O3, which could effectively promote separation of photo-induced carries. More importantly, the transfer of electrons from AgI to Sb2O3 would be in favor of restraining the reduction of Ag+ to Ag0 resulting in the good stability of heterojunction photocatalysts. The heterojunction photocatalyst provided in this work might be a prospective candidate for decontamination of water.
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Affiliation(s)
- Ziyue Zhou
- Hubei Key Laboratory of Mineral Resources Processing and Environment, State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070, China
| | - Leguan Zhang
- College of Municipal and Environmental Engineering, Henan University of Urban Construction, Pingdingshan, 467036, China
| | - Wuao Su
- Urban Construction College, Wuchang Shouyi University, Wuhan, 430070, China
| | - Yuan Li
- Hubei Key Laboratory of Mineral Resources Processing and Environment, State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070, China.
| | - Gaoke Zhang
- Hubei Key Laboratory of Mineral Resources Processing and Environment, State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070, China; Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou, 450052, China.
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