反应接口结构对薄膜复合膜形态和性能的影响
1Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environment and Ecology, Jiangnan University, Wuxi 214122, PR China.
Environmental science & technology
|January 14, 2025
概括
这项研究通过在活性层 (AL) 中创建类似洞穴的结构来增强薄膜复合材料 (TFC) 膜. 这项创新大大提高了水的流量,并减少了前向透系统中的盐泄漏.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 膜技术 膜技术 膜技术
背景情况:
- 薄膜复合材料 (TFC) 膜在分离过程中至关重要.
- 优化活性层 (AL) 形态是提高TFC膜性能的关键.
- 现有的TFC膜面临着流量和选择性的限制.
研究的目的:
- 在TFC膜的AL中设计类似洞穴的结构,使用大型半径接口.
- 研究接口结构和二二硫酸盐 (SDBS) 对AL生长和形态学的影响.
- 为了提高TFC膜的有效表面积和性能,用于向前透.
主要方法:
- 构建具有洞穴状AL结构的TFC膜.
- 使用二甲基二硫酸盐 (SDBS) 控制纳米泡的形成和AL迁移.
- 使用孔径为1.00微米,SDBS度为0.30毫米的基板.
- 使用粗度因子量化有效表面积.
主要成果:
- SDBS诱导的纳米泡促进了AL的迁移,创造了类似洞穴的结构.
- 更大的接口和SDBS显著提高了AL的有效表面积.
- 优化的TFC膜实现了超过63%的流量增强和超过35%的逆盐流量减少.
- 在粗度因子和水流量之间观察到强烈的相关性.
结论:
- 在AL的洞穴状结构中,由大型接口和SDBS促进,提高TFC膜的性能.
- 具有较大孔径的基质可以克服固有的TFC膜限制.
- 这些发现突出了开发用于前向透的高性能TFC膜的有希望的战略.
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