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Xiao Q, Yang Z, Li W, Wei B, Guo H, Yu S, Gan Q, Liu W, Tang CY. Iron Nanoparticles-Confined Graphene Oxide Membranes Coupled with Sulfite-Based Advanced Reduction Processes for Highly Efficient and Stable Removal of Bromate. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:18009-18019. [PMID: 39329389 DOI: 10.1021/acs.est.4c04392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/28/2024]
Abstract
Advanced reduction processes (ARPs) are promising for pollutant removal in drinking water treatment. In this study, we demonstrated highly efficient reduction of bromate, a harmful disinfection byproduct, by coupling ARPs with an iron nanoparticles-intercalated graphene oxide (GO@FeNPs) catalytic membrane. In the presence of 1.0 mM sulfite (S(IV)), the GO@FeNPs membrane/S(IV) system achieved nearly complete removal of 80 μg/L bromate in 3 min. The first-order reaction rate constant for bromate removal in this system was 420 ± 42 min-1, up to 5 orders of magnitude faster than previously reported ARPs. The GO@FeNPs catalytic membrane may offer potential advantages of nanoconfinement and facilitated electron shuttling in addition to the high surface area of the fine FeNPs, leading to the remarkable ARP performance. The GO@FeNPs membrane showed excellent stability, maintaining >97.0% bromate removal over 20 cycles of repeated runs. The membrane can also be applied for fast catalytic reduction of other oxyanions, showing >98.0% removal of nitrate and chlorate. This work may present a viable option for utilizing high-performance reductive catalytic membranes for water decontamination.
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Affiliation(s)
- Qian Xiao
- Department of Civil Engineering, The University of Hong Kong, Hong Kong, SAR 999077, China
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
| | - Zhe Yang
- Department of Civil Engineering, The University of Hong Kong, Hong Kong, SAR 999077, China
| | - Wanbin Li
- Guangdong Key Laboratory of Environmental Pollution and Health, College of Environment and Climate, Jinan University, Guangzhou 511443, China
| | - Bo Wei
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China
- School of Energy and Environment, City University of Hong Kong, Hong Kong, SAR 999077, China
| | - Hao Guo
- Department of Civil Engineering, The University of Hong Kong, Hong Kong, SAR 999077, China
| | - Shuili Yu
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
| | - Qimao Gan
- Department of Civil Engineering, The University of Hong Kong, Hong Kong, SAR 999077, China
| | - Wenyu Liu
- Department of Civil Engineering, The University of Hong Kong, Hong Kong, SAR 999077, China
| | - Chuyang Y Tang
- Department of Civil Engineering, The University of Hong Kong, Hong Kong, SAR 999077, China
- Materials Innovation Institute for Life Sciences and Energy (MILES), HKU-SIRI, Shenzhen 518000, China
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Liu T, Deng J, Yang C, Liu M, Liu Y. Photo-reduction of nitrate to nitrite in aqueous solution in presence of CaO: Selectivity, mechanism and application. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2022.122364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2023]
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One Bicopper Complex with Good Affinity to Nitrate for Highly Selective Electrocatalytic Nitrate Reduction to Ammonia. Catalysts 2022. [DOI: 10.3390/catal12121561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
Abstract
Ammonia (NH3) plays an irreplaceable role in human life as a promising energy carrier and indispensable chemical raw material. Nitrate electroreduction to ammonium (NRA) not only removes nitrate pollutants, but also can be used for efficient NH3 production under ambient conditions. However, achieving high efficiency and selectivity of electrocatalysts is still a great challenge. Herein, a complex Cu2(NO3)4(BMMB)·H2O with a bicopper core is assembled by Cu(NO3)2·3H2O and 1,4-bis{[2-(2’-pyridyl)benzimidazolyl]methyl}benzene (BMMB) for NRA under alkaline conditions. The optimal sample showed excellent nitrate reduction performance with the NO3− conversion rate of 70%, Faradaic efficiency of up to 90%, and NH3 selectivity of more than 95%. The high-catalytic activity is mainly due to the ingeniously designed copper cores with strong affinity for NO3−, which accelerates the transferring rate of adsorbed nitrate on the Cu surface and increases the efficiency of rate-determining step (NO3− → NO2−) in the whole catalytic process. Therefore, the transformation of surface-exposed nitrate can be rapidly catalyzed by the Cu active sites, facilitating the conversion efficiency of nitrate.
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