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Synchronous Reduction-Oxidation Process for Efficient Removal of Trichloroacetic Acid: H* Initiates Dechlorination and center dot OH Is Responsible for Removal Efficiency
Zhang, Jun; Ji, Qinghua; Lan, Huachun; Zhang, Gong; Liu, Huijuan; Qu, Jiuhui
2019-12-17
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN0013-936X
Volume53Issue:24Pages:14586-14594
AbstractDegradation of chlorinated disinfection by-products using the electroreduction process has been considered as a promising approach for advanced water treatment, while the removal efficiency is restricted by a high barrier for dechlorination of intermediates only by reductive atomic hydrogen (H*) and excessive cost required for reducing atmosphere. In this paper, we predict that the dechlorination efficiency for trichloroacetic acid (TCA), a typical chlorinated disinfection by-product, can be accelerated via a synchronous reduction-oxidation process, where the dechlorination barrier can be lowered by the oxidation reactions toward the critical intermediates using hydroxyl radicals (.OH). Based on scientific findings, we constructed a synchronous reduction-oxidation platform using a Pd-loaded Cu/Cu2O/CuO array as the core component. According to the combined results of theoretical and experimental analyses, we found that the high dispersion of nano-sized Pd on a photocathode was beneficial for the production of a high concentration of H* at low overpotential, a perquisite for initiating the dechlorination reaction. Simultaneously, excess H* has the potential to convert O-2 to H2O2 in ambient conditions (air condition), and H2O2 can be further activated by a Cu-containing substrate to ..OH for attacking the critical intermediates. In this system, similar to 89.1% of TCA was completely dechlorinated and similar to 26.8% mineralization was achieved in 60 min, which was in contrast to the value of similar to 65.7% and mineralization efficiency of only similar to 1.7% achieved through the reduction process (Ar condition).
Department中国科学院饮用水科学与技术重点实验室
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/43532
Collection中国科学院饮用水科学与技术重点实验室
Affiliation1.Tsinghua Univ, Sch Environm, Ctr Water & Ecol, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100084, Peoples R China
2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Jun,Ji, Qinghua,Lan, Huachun,et al. Synchronous Reduction-Oxidation Process for Efficient Removal of Trichloroacetic Acid: H* Initiates Dechlorination and center dot OH Is Responsible for Removal Efficiency[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2019,53(24):14586-14594.
APA Zhang, Jun,Ji, Qinghua,Lan, Huachun,Zhang, Gong,Liu, Huijuan,&Qu, Jiuhui.(2019).Synchronous Reduction-Oxidation Process for Efficient Removal of Trichloroacetic Acid: H* Initiates Dechlorination and center dot OH Is Responsible for Removal Efficiency.ENVIRONMENTAL SCIENCE & TECHNOLOGY,53(24),14586-14594.
MLA Zhang, Jun,et al."Synchronous Reduction-Oxidation Process for Efficient Removal of Trichloroacetic Acid: H* Initiates Dechlorination and center dot OH Is Responsible for Removal Efficiency".ENVIRONMENTAL SCIENCE & TECHNOLOGY 53.24(2019):14586-14594.
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