膜
超滤(肾)
聚氯乙烯
木质素
生物污染
化学工程
相位反转
接触角
材料科学
结垢
渗透
化学
有机化学
色谱法
复合材料
工程类
生物化学
作者
Ming Yu,Yuqing Zhang,Shuai Sun,Wei Liu
标识
DOI:10.1016/j.memsci.2019.01.005
摘要
Usually seen as a waste with low chemical value and limited commercial potential, lignin produced in large quantity from paper industry performs abundant valuable hydrophilic groups which make it a potential hydrophilic assistant. In this contribution, in order to improve hydrophilicity and antifouling properties of PVC ultrafiltration membrane, lignin was doped into PVC to prepare a uniform sol under strengthening heat and mass transfer process, and then PVC/lignin ultrafiltration membranes were prepared via phase inversion strategy. The resulted PVC/lignin ultrafiltration membranes were characterized by SEM, FT-IR, XPS, DSC and were also tested by oily wastewater. According to the results of SEM, XRD and DSC analyses, PVC is compatible with lignin and the homogeneous PVC/lignin sol can be formed. The hydrophilicity of membrane is significantly enhanced with water contact angle (WCA) decreasing from 106.73° to 41.53°. Particularly, the PVC/lignin ultrafiltration membranes exhibit attractive properties with oil rejection of 97.36% and oily wastewater permeation flux of 156.55 L m−2 h−1 (0.1 MPa), nearly 2.5 times that of pure one (65.06 L m−2 h−1). Lignin suggests to be a superior additive to improve hydrophilic and anti-fouling properties of PVC membranes, and the lignin-modified membranes are promising candidates for cleaning oily wastewater and sewage.
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