HIGHLY SELECTIVE NANOFILTRATION SEPARATION TECHNOLOGY FACILITATES RESOURCE EXTRACTION AND RECOVERY FROM HIGH SALINITY ENVIRONMENTS
Within the ambit of low-carbon objectives and the circular economy paradigm,resource recovery and extraction have received wide attention.High-salinity wastewater,as a trove of untapped resources,poses a dual challenge:the direct emissions of high salinity wastewater lead to environmental pollution,and squander valuable resources.This review delves into the application of nanofiltration(NF)membranes in resource recovery and extraction from high salinity environments,meticulously tracing the recent advancements in ion-selective NF separation technologies.Firstly,we consolidate the solute separation mechanisms of NF membranes,encompassing steric effect,Donnan exclusion,dielectric exclusion effects,and transition state theory.Subsequently,we delve into the evaluation metrics essential for assessing NF membrane performance,including separation factor,purity,recovery rate,and solute permeability.Furthermore,we highlight four exemplary high-salinity scenarios,seawater resource extraction,zero discharge of industrial wastewater,lithium extraction from brines,and electroplating wastewater treatment,where NF membranes have demonstrated promising applications and ongoing developments.These cases illustrate the versatility and potential of NF technologies in addressing diverse resource recovery challenges.Lastly,from a resource recovery perspective,we dissect optimization strategies aiming at enhancing water permeability and separation selectivity.These insights offer valuable guidance for the customization of highly selective NF membranes,tailoring them to meet the unique demands of various high-salinity environments.This review contributes to advancing the frontier of NF membrane technology and fostering sustainable resource management practices.
nanofiltration membranehigh-salt environmentresource extraction and recoveryselective separationoptimal design
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