1 School of Chemistry & Materials Engineering, Xinxiang University, Xinxiang 453003, China; 2 Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China; 3 College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
Abstract: Poly (vinyl chloride-co-dimethylaminoethyl methacrylate) (PVD) was added into polyvinyl chloride (PVC) matrix, following with the tertiary amine groups of PVD in the casting solution in-situ quaternized by methyl iodide (CH3I) at 60 ℃, then a novel strong positively charged PVC/PVD (M1) microfiltration membrane was prepared by non-solvent induced phase separation (NIPS) process. The PVC (M0) microfiltration membrane was also prepared and compared with M1. The morphologies, pore size, charge, hydrophilicity and pure water flux of M0 and M1 were characterized. The removal of trace Cr(Ⅵ)(Cr2O72-) from aqueous solution via micellar-enhanced filtration and the effect of Cr(Ⅵ)concentration, pH and sodium chloride (NaCl) concentration on Cr(Ⅵ)removal with cationic surfactant stearyl trimethyl ammonium chloride (STAC) were studied. The results showed that the rejection of Cr(Ⅵ)removal by micellar-enhanced filtration for M1 was close to 100%. When the molar ratio of Cr(Ⅵ)/STAC was greater than 0.478, the rejection of Cr(Ⅵ)for M1 decreased with the increase of Cr(Ⅵ)concentration. The pH of the separation system had little effect on the rejection of Cr(Ⅵ)for M1. High feed concentration of NaCl was very harmful to the rejection of Cr(Ⅵ). It can be seen that the M1 has potential development prospects in the treatment of wastewater containing Cr(Ⅵ)heavy metal ions.
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2021, Vol. 35 
