The efficient removal of low concentration hexavalent chromium via combining charged microporous membrane and micellar adsorption filtration

Author:

Yang Wu-Shang1,Zhang Peng2,Shen Shu-Yang1,Su Qian-Wei1,Jiang Ya-Ni1,Wang Jian-Li2,Zhou Ming-Yong3,Qiu Ze-Lin14,Zhu Bao-Ku1

Affiliation:

1. Department of Polymer Science and Engineering, ERC of Membrane and Water Treatment (MOE), Key Laboratory of Macromolecular Synthesis and Functionalization , Zhejiang University , Hangzhou 310027 , China

2. College of Chemical Engineering , Zhejiang University of Technology , Hangzhou 310014 , China

3. Center for Stem Cell and Regenerative Medicine, and Bone Marrow Transplantation Center of the First Affiliated Hospital , Zhejiang University School of Medicine , Hangzhou 310000 , China

4. International Joint Innovation Center, International Research Center for Functional Polymers , Zhejiang University , Haining 314400 , China

Abstract

Abstract It is challenging to effectively purge wastewater containing heavy metal ions at low concentration. In order to remove trace Cr (VI) from wastewater efficiently, a positively charged microporous membrane was prepared by firstly non-solvent induced phase separation (NIPS) of amphiphilic polymer and secondly surface quaternization modification. The morphologies, surface roughness, surface charge, hydrophilicity, and pore size of membranes were characterized. Based on the dual action of micellar adsorption and charge repulsion, when surfactant is 4 mM and Cr (VI) is 60 ppm, the surface quaternization membrane (Q-MPVD) achieves 99.8 % Cr (VI) rejection simultaneously accompanied by a permeability of 100 LMH/bar. Meanwhile, the effects of STAC concentration, Cr (VI) concentration, pH as well as inorganic salt concentration on the composite micellar size, and Cr (VI) rejection performance were investigated, respectively. Moreover, the Q-MPVD membrane shows an excellent separation stability over a wide pH range, indicating its application perspective in engineering process. In summary, this work provided a positively charged membrane with high-efficiency performance for treating practical trace Cr (VI)-containing industrial wastewater.

Funder

National Key R&D program of China

Natural Science Foundation of Zhejiang Province, China

Publisher

Walter de Gruyter GmbH

Subject

Materials Chemistry,Polymers and Plastics,General Chemical Engineering

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