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Efficient removal of nickel(II) from high salinity wastewater by a novel PAA/ZIF-8/PVDF hybrid ultrafiltration membrane.

Authors
  • Li, Ting1
  • Zhang, Weiming2
  • Zhai, Shu1
  • Gao, Guandao3
  • Ding, Jie1
  • Zhang, Wenbin1
  • Liu, Yang1
  • Zhao, Xin3
  • Pan, Bingcai3
  • Lv, Lu3
  • 1 State Key Laboratory of Pollution Control and Resource Reuse, Research Center for Environmental Nanotechnology, School of the Environment, Nanjing University, 210023, PR China. , (China)
  • 2 State Key Laboratory of Pollution Control and Resource Reuse, Research Center for Environmental Nanotechnology, School of the Environment, Nanjing University, 210023, PR China; State Environmental Protection Engineering Center for Organic Chemical Wastewater Treatment and Resource Reuse, Nanjing, 210046, PR China. Electronic address: [email protected] , (China)
  • 3 State Key Laboratory of Pollution Control and Resource Reuse, Research Center for Environmental Nanotechnology, School of the Environment, Nanjing University, 210023, PR China; State Environmental Protection Engineering Center for Organic Chemical Wastewater Treatment and Resource Reuse, Nanjing, 210046, PR China. , (China)
Type
Published Article
Journal
Water research
Publication Date
Oct 15, 2018
Volume
143
Pages
87–98
Identifiers
DOI: 10.1016/j.watres.2018.06.031
PMID: 29940365
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Enhanced removal of trace toxic metals (ppm level) from high-salinity wastewater is crucial to ensure water safety but still a challenging task. In this study, we fabricated a new hybrid ultrafiltration membrane (PAA/ZIF-8/PVDF) by immobilizing zeolitic imidazolate framework-8 (ZIF-8) particles onto the surface of trimesoyl chloride (TMC)-modified polyvinylidene fluoride (PVDF) membrane under protection of polyacrylic acid (PAA) layer. The resultant PAA/ZIF-8/PVDF membrane exhibited relatively high water flux of 460 L·m-2 h-1 and outstanding nickel ion (Ni(II)) capacity (219.09 mg/g) from a synthetic high-salinity ([Na+] = 15000 mg/L) wastewater. X-ray photoelectron spectroscopic studies revealed that preferable Ni(II) uptake was mainly attributed to the specific interaction between Ni(II) and hydroxyl groups on ZIF-8 frameworks and carboxyl groups in PAA layer as well. Compared to PAA, ZIF-8 could selectively bind Ni(II) with negligible effect exerted by concentrated sodium ion. The filtration study showed that the 12.56-cm2 membrane could effectively treat 5.76 L high-salinity wastewater ([Ni(II)0 = 2 mg/L, [Na+]0 = 15000 mg/L) to conspicuously reduce Ni(II) below the maximum contaminant level of China, 0.1 mg/L. Moreover, the hybrid membrane could be regenerated by HCl-NaCl solution (pH = 5.5) for repeated use under direct current electric field. Generally speaking, the newly developed ZIF-8 hybrid ultrafiltration membrane showed a very promising potential in enhanced removal of toxic metals from high-salinity wastewater treatment. Copyright © 2018 Elsevier Ltd. All rights reserved.

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