期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 553, 期 -, 页码 475-483出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2019.06.051
关键词
2,5-Diaminobenzenesulfonic acid (DABSA); Nanofiltration; Negative charge; Hexavalent chromium Cr(VI); Donnan exclusion
资金
- National 863 Program of China [2012AA03A602]
- National Key R&D Program of China [2017YFE0114100]
- National Natural Science Foundation of China [21805240]
- Natural Science Foundation of Zhejiang Province [LY19E030005]
To enhance hexavalent chromium (Cr(VI)) removal performance under acidic conditions, the nanofiltration (NF) membrane with enhanced negative charge was fabricated via introducing 2, 5-diaminobenzenesulfonic acid (DABSA) into polyamide layer. The control membrane (NF-P) was directly prepared from piperazine and 1, 3, 5-benzenetricarbonyltrichloride. Surface chemical compositions, morphology, surface charge, pore size, permeability and pH-dependent separation performance of the fabricated membranes were characterized. The membranes showed the similar water permeance (similar to 11.5 L m(-2) h(-1) bar(-1)) and Na2SO4 rejections (similar to 98%) under neutral environments. The DABSA introduced NF membrane (NF-PD) was negatively charged in the pH range of 2.5-11, while the isoelectric point for NF-P was similar to pH 4.0. Cr(VI) removal ability was then evaluated under various concentrations and pH environments. The results indicated that NF-PD showed the better Cr(VI) rejection performance in all tested conditions than NF-P, especially under acidic environments (e.g., pH 4 and pH 5). Moreover, there was a fluctuation of the rejection with the increase of Cr(VI) concentration under acidic environments, which was mainly caused by the formation of Cr2O72- species. The harmful Cr(VI) was efficiently removed by the NF membrane with enhanced negative charge under acidic environments, which indicated the wider application range of the NF membrane. (C) 2019 Elsevier Inc. All rights reserved.
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