Mechanistic Insights into Micelle-Enhanced Nanofiltration for Heavy Metal Removal: Transformation of Ion Transport and Fouling Phenomena,Environmental Science & Technology

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Mechanistic Insights into Micelle-Enhanced Nanofiltration for Heavy Metal Removal: Transformation of Ion Transport and Fouling Phenomena
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2024-07-24 , DOI: 10.1021/acs.est.4c03741
Xin Mao ₁ , Junlong Cai ₁ , Ruoxi Wu ₁ , Bin Liu ₁

Affiliation

Toxic heavy metals are widely present in typical scenarios, such as mines and electroplating wastewater, presenting significant risks to biological and environmental safety. Membrane processes encounter a challenge in effectively intercepting heavy metals due to their small hydration radius. This research showcases the high efficiency of micelle-enhanced nanofiltration (MENF) in removing heavy metals. At the critical micelle concentration, sodium dodecyl sulfate demonstrated a high removal of Cu²⁺, Ni²⁺, Zn²⁺, and Cd²⁺ while maintaining substantial potential for complexation of heavy metals. The formation of micelles and the bonding of heavy metals with surfactants bolstered the resistance of heavy metal ions to transmembrane transport. The presence of heavy metals in ionic form in wastewater facilitated their complexation with surfactants or micelles. Notably, the valence state and concentration of interfering ions in the environment could slightly influence the removal of heavy metals by MENF. Additionally, MENF displayed remarkable antifouling properties. The loose gel layer created by surfactant molecules and the micelle enhanced the membrane permeability and reduced the scaling tendency of heavy metals. This study contributes to an improved understanding of the mechanisms involved in heavy metal rejection by using MENF.

中文翻译：

胶束增强纳滤去除重金属的机理见解：离子传输和污垢现象的转变

有毒重金属广泛存在于矿山、电镀废水等典型场景中，对生物和环境安全构成重大风险。由于水合半径较小，膜工艺在有效拦截重金属方面遇到了挑战。这项研究展示了胶束增强纳滤（MENF）在去除重金属方面的高效性。在临界胶束浓度下，十二烷基硫酸钠表现出对 Cu ²⁺ 、Ni ²⁺ 、Zn ²⁺和 Cd ²⁺的高去除率，同时保持了重金属络合的巨大潜力。胶束的形成以及重金属与表面活性剂的结合增强了重金属离子对跨膜运输的抵抗力。废水中离子形式的重金属的存在促进了它们与表面活性剂或胶束的络合。值得注意的是，环境中干扰离子的价态和浓度可能会轻微影响 MENF 对重金属的去除。此外，MENF 还表现出卓越的防污性能。表面活性剂分子和胶束形成的疏松凝胶层增强了膜的渗透性，降低了重金属的结垢倾向。这项研究有助于更好地了解使用 MENF 排斥重金属的机制。

更新日期：2024-07-24

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