Scholarlink

<p>Membrane distillation (MD) is an advanced membrane separation process that employs hydrophobic microporous membranes to separate non-volatile solutes from the feed solution, driven by vapor pressure gradients generated through thermal difference. This technology offers strong desalination capabilities and efficiently harnesses low-grade thermal energy sources, including geothermal and waste heat, making it a cost-effective solution for freshwater scarcity. Nevertheless, hydrophobic membranes are prone to contamination by surfactants, inorganic salts, and other substances in feed solutions. To address this, low-surface-energy composite nano-inorganic materials composed of carbon nanotubes and silica were modified and synthesized <i>via</i> organosilicon chemistry. A superhydrophobic surface exhibiting a water contact angle of 157.96° was successfully fabricated using above nano-materials on poly(vinylidene fluoride) (PVDF) membrane surface with micro-nano structures <i>via</i> a one-step spray-coating method. Compared to unmodified PVDF membrane, the superhydrophobic membrane demonstrated superior resistance to common scaling agents such as CaCl<sub>2</sub>, Mg(OH)<sub>2</sub>, CaCO<sub>3</sub>, and CaSO<sub>4</sub>, while maintaining stable permeate flux (13.4 kg·m<sup>−2</sup>·h<sup>−1</sup>) during MD tests. Additionally, the modified membrane exhibited enhanced wetting resistance when treating feed solutions containing sodium dodecyl sulfate (SDS), significantly extending the operational lifespan of the membrane. Due to its outstanding performance, this superhydrophobic membrane is expected to promote the practical application of MD technology in the treatment of complex wastewater and efficient seawater desalination.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Fabrication of Superhydrophobic Membrane via One-step Spraying Strategy Utilizing Organosilicon Chemistry and Its Performance in Membrane Distillation

  • 期刊论文

  • 发表日期：

    2025年12月25日

查看全文
  • Tian-Tian Li,
  • Zheng Xu,
  • Yu-Jing Zhang,
  • Ming-Han Su,
  • Shun-Da Liu,
  • Shao-Fei Zhang

摘要

Membrane distillation (MD) is an advanced membrane separation process that employs hydrophobic microporous membranes to separate non-volatile solutes from the feed solution, driven by vapor pressure gradients generated through thermal difference. This technology offers strong desalination capabilities and efficiently harnesses low-grade thermal energy sources, including geothermal and waste heat, making it a cost-effective solution for freshwater scarcity. Nevertheless, hydrophobic membranes are prone to contamination by surfactants, inorganic salts, and other substances in feed solutions. To address this, low-surface-energy composite nano-inorganic materials composed of carbon nanotubes and silica were modified and synthesized via organosilicon chemistry. A superhydrophobic surface exhibiting a water contact angle of 157.96° was successfully fabricated using above nano-materials on poly(vinylidene fluoride) (PVDF) membrane surface with micro-nano structures via a one-step spray-coating method. Compared to unmodified PVDF membrane, the superhydrophobic membrane demonstrated superior resistance to common scaling agents such as CaCl2, Mg(OH)2, CaCO3, and CaSO4, while maintaining stable permeate flux (13.4 kg·m−2·h−1) during MD tests. Additionally, the modified membrane exhibited enhanced wetting resistance when treating feed solutions containing sodium dodecyl sulfate (SDS), significantly extending the operational lifespan of the membrane. Due to its outstanding performance, this superhydrophobic membrane is expected to promote the practical application of MD technology in the treatment of complex wastewater and efficient seawater desalination.