Surface engineering with ionic polymers on membranes for boron removal  

作　　者：Xiting Zhang Chenyi Fang J Paul Chen Sui Zhang 

机构地区：[1]Department of Chemical and Biomolecular Engineering,National University of Singapore,Singapore 117576,Singapore [2]Department of Civil and Environmental Engineering,National University of Singapore,Singapore 119260,Singapore [3]College of Chemistry and Environmental Engineering,Shenzhen University,Shenzhen 518060,China

出　　处：《Frontiers of Chemical Science and Engineering》2024年第5期61-69,共9页化学科学与工程前沿（英文版）

基　　金：the financial support by the Ministry of Education of Singapore via the Tier-1 project A-8000192-01-00.

摘　　要：Removal of boric acid from seawater and wastewater using reverse osmosis membrane technologies is imperative and yet remains inadequately addressed by current commercial membranes.Existing research efforts performed post-modification of reverse osmosis membranes to enhance boron rejection,which is usually accompanied by substantial sacrifice in water permeability.This study delves into the surface engineering of low-pressure reverse osmosis membranes,aiming to elevate boron removal efficiency while maintaining optimal salt rejection and water permeability.Membranes were modified by the self-polymerization and co-deposition of dopamine and polystyrene sulfonate at varying ratios and concentrations.The surfaces became smoother and more hydrophilic after modification.The optimum membrane exhibited a water permeability of 9.2±0.1 L·m^(-2)·h^(-1)·bar^(-1),NaCl rejection of 95.8%±0.3%,and boron rejection of 49.7%±0.1% and 99.6%±0.3% at neutral and alkaline pH,respectively.The water permeability is reduced by less than 15%,while the boron rejection is 3.7 times higher compared to the blank membrane.This research provides a promising avenue for enhancing boron removal in reverse osmosis membranes and addressing water quality concerns in the desalination process.

关 键 词：MEMBRANE low-pressure reverse osmosis BORON surface engineering 

分 类 号：O64[理学—物理化学]