CF4 plasma-modified superhydrophobic PVDF membranes for direct contact membrane distillation
CF4 plasma-modified superhydrophobic PVDF membranes for direct contact membrane distillation
复制标题
用于直接接触膜蒸馏的 CF4 等离子体改性超疏水 PVDF 膜
DOI：
10.1016/j.memsci.2014.01.013
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发表时间：
2014-04-15
影响因子：
9.5
通讯作者：
He, Tao
中科院分区：
文献类型：
--
作者：
Yang, Chi;Li, Xue-Mei;He, Tao
通过对CF4等离子体进行表面改性，制备了用于直接接触膜蒸馏(DCMD)的高性能超疏水PVDF平板膜。在DCMD过程中，以氯化钠溶液(4wt%)为原料，考察了未改性膜和CF4改性膜的性能。结果表明，改性后的聚偏氟乙烯超疏水膜(水接触角为162.4度)的水通量比未修饰的聚偏氟乙烯膜高约30%。从膜形态、气体渗透性、进液压力和接触角测量等方面详细研究了导致膜性能显著改善的潜在机理。结果表明，气体渗透性的提高和超疏水性的结合是提高水通量的主要原因。(C)2014爱思唯尔B.V.保留所有权利。
High performance superhydrophobic PVDF flat sheet membranes for direct contact membrane distillation (DCMD) were prepared via CF4 plasma surface modification. The performance of the virgin and CF4 modified membranes was examined using sodium chloride solution (4 wt%) as feed in a DCMD process. Results reveal that CF4 surface modification yielded superhydrophobic membranes (water contact angle: 162.4 degrees) with about 30% higher water flux than the virgin PVDF membrane. The underlying mechanism that leads to the significant improvement in membrane performance was investigated in detail with respect to membrane morphology, gas permeability, liquid entry pressure, and contact angle measurements. Results indicate that the combination of increased gas permeability and superhydrophobicity contributes mostly to the improved water flux. (C) 2014 Elsevier B.V. All rights reserved.