Degradation of polyamide nanofiltration membranes by free chlorine and halide ions: Kinetics, mechanisms, and implications.

Autor: Yang L; National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, East China University of Science and Technology, Shanghai 200237, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China; School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, PR China. Electronic address: lyyang@ecust.edu.cn., Yu H; School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, PR China., Zhao H; National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, East China University of Science and Technology, Shanghai 200237, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China; School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, PR China., Xia C; School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, PR China., Yu Q; School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, PR China., Chen X; Fujian Provincial Engineering Research Center of Rural Waste Recycling Technology, College of Environment and Safety Engineering, Fuzhou University, Fuzhou, Fujian, 350116, PR China. Electronic address: xuemch@kt.dtu.dk., Cao G; School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, PR China., Cai L; School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, PR China., Meng S; School of Space and Environment, Beihang University, Beijing 100191, PR China., Tang CY; Department of Civil Engineering, University of Hong Kong, Pokfulam, Hong Kong, PR China.
Jazyk: angličtina
Zdroj: Water research [Water Res] 2024 Dec 11; Vol. 272, pp. 122963. Date of Electronic Publication: 2024 Dec 11.
DOI: 10.1016/j.watres.2024.122963
Abstrakt: The kinetics of polyamide membrane degradation by free chlorine and halide ions (Br - and Cl - ) were innovatively evaluated based on physicochemical properties and filtration performance, using water/solute permeability coefficient in addition to bromide incorporation as important indicators. The reaction rate constants for the reduced water and H 3 BO 3 permeability coefficient were 1-2 orders of magnitude higher at 0-1 h than 1-10 h. N-bromination and bromination-promoted hydrolysis are dominant degradation mechanisms at 0-1 h (reflected by the breakage of hydrogen bond, the increased Ca binding content, and the increased charge density), and ring-bromination further occurs at 1-10 h (reflected by the disappearance or weakening of aromatic amide band and the nearly constant hydrogen bond). The more reactive but less abundant brominating agents (Br 2 O, BrOCl, BrCl, and Br 2 ) played significant roles in membrane degradation, contradicting the conventional belief that HOBr is the only reactive species. BrCl at pH 4.0 and BrOCl and Br 2 O at pH 7.0 made significantly higher contributions to membrane degradation than HOBr (>76 % vs. <13 %). The increased contribution of BrCl and Br 2 with the increased [Cl - ] and [Br - ] ex (the excess bromide, defined as [Br - ] o - [HOCl] o when [Br - ] o > [HOCl] o ), respectively, was responsible for the greater reduction of water permeability coefficient. The innovative and simple approach developed in this study provides important insights to evaluate and predict membrane degradation.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024. Published by Elsevier Ltd.)
Databáze: MEDLINE
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