Influence of pH and NaCl concentration on boron rejection during nanofiltration
نویسندگان
چکیده
Nanofiltration (NF) is promising for replacing reverse osmosis boron removal more effectively and at a higher energy efficiency. However, the interplay of steric charge effects underlying rejection behaviors solutes smaller than membrane pore size remained incompletely understood, which impedes implementation. This study investigated influence pH NaCl concentration on boric acid/borate by Desal 5DK NF membrane, with acetic acid/acetate (comparable nature) glucose (larger neutral) serving as benchmarks. Filtration experiments demonstrate that varying in range 3–11 up to 100 mM had little effect (consistently greater 95%), but affected two significantly. Increasing from 7 11 led 15% charged acetate because increased charges both solute, while increasing 3 gave 30% neutral acid due stemming pore-size reduction. The rejections were negligibly concentration, decreased 50% borate acetate, respectively, salt-induced pore-swelling.
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ژورنال
عنوان ژورنال: Separation and Purification Technology
سال: 2021
ISSN: ['1873-3794', '1383-5866']
DOI: https://doi.org/10.1016/j.seppur.2020.118248