以毛细管效应为灵感的海绵结构的氧甲基纤维素气凝层修改膜,用于在超低压下有效分离染料/盐
Fengling Tang1, Jing Yang1, Ligang Lin1
1State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membranes, School of Material Science and Engineering, Tiangong University, Tianjin 300387, China.
International journal of biological macromolecules
|November 12, 2024
概括
这项研究开发了一种超低压膜,使用生物海绵结构的气凝来有效分离染料/盐. 这种新型膜实现了高水流量和优秀的污染物排放,提供了可持续的废水处理解决方案.
科学领域:
- 材料科学 材料科学 材料科学
- 环境工程 环境工程
- 化学工程是化学工程的重要组成部分.
背景情况:
- 污水处理面临着染料/盐分离的挑战,原因是高压下度极化和膜污垢.
- 现有的方法通常需要高压,导致效率低下和膜退化.
- 在废水处理中需要低压,高效的分离膜.
研究的目的:
- 设计和制造一种超低压膜,以提高染料和盐分离性能.
- 研究生物海绵结构的气凝层对膜特性和性能的影响.
- 为了评估染料/盐的排斥,水的流量,以及修改膜的长期稳定性.
主要方法:
- 在聚乙烯化物 (PVDF) 膜上制造一个碳素甲基纤维素 (CMC) 气凝层,使用层次的交叉连接和冷干燥,使用酸.
- 将聚烯 (PPy) 纳入气凝,以提高机械性能和分离性能.
- 在接近零的压力下测试修改后的膜,用于染料/盐分离和纯水流量测量.
主要成果:
- 生物气凝层创建了一个具有毛细血管效应的3D网状结构,促进了快速的水运输.
- 经过修改的膜在超低压下表现出优异的染料排斥 (>99%) 和中度的盐排斥 (<10%).
- 实现了高纯水流量 (101.3 L·m−2·h−1) 和良好的长期稳定性.
- 添加PPy提高了机械强度,防止了分离过程中的气凝崩.
结论:
- 生物海绵结构的气凝膜显示了在废水处理中高效和低压染料/盐分离的巨大潜力.
- 气凝的独特结构和成分有助于高性能和稳定性.
- 这种方法为开发用于环境应用的先进膜提供了一个有前途的战略.
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