首页|Surface engineering with ionic polymers on membranes for boron removal
Surface engineering with ionic polymers on membranes for boron removal
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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 memb-ranes 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 permeabi-lity 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.
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