Preparation of photo-induced self-cleaning membranes based on CoAl-LDHs and Zr-tannic acid coordination polymers and optimization of their emulsion separation performance

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology Pub Date : 2025-01-10 DOI:10.1016/j.seppur.2025.131576

Shiwei Shi , Yijian Zheng , Zhian Wang , Feipeng Jiao

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Abstract

In this study, a superhydrophilic/underwater superoleophobic emulsion separation membrane based on CoAl layered double hydroxides (LDHs) and Zr-tannic acid porous coordination polymer (ZT-PCP) was prepared, and the robustness of the coating was improved by polyacrylamide (PAAm) modification. The prepared LDHs-PCP-PAAm membrane exhibited excellent performance, with separation efficiencies exceeding 99.7 % for a wide range of simulated emulsions. The optimization of the preparation method by controlling the coating amount achieved good separation stability while maintaining high permeability. In addition, the LDHs-PCP-PAAm membrane possesses a reliable photo-induced self-cleaning property, which effectively removes water-soluble organic pollutants adsorbed on the membrane surface and restores its superoleophobicity under light exposure. This photo-induced self-cleaning property extends the service life of the membrane, especially when processing complex oil-in-water emulsions. Mechanical property tests showed that the introduction of PAAm significantly enhanced the durability of the membranes, allowing them to maintain their integrity during multiple cycles of use and wear. This study provides a new approach for the development of efficient and sustainable membrane materials for oil/water separation and offers new ideas for the application of photocatalytic technology in the environmental field.

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煤- ldhs与zr -单宁酸配位聚合物光致自洁膜的制备及其乳状液分离性能的优化

本研究制备了一种基于煤层状双氢氧化合物（LDHs）和zr -单宁酸多孔配位聚合物（ZT-PCP）的超亲水/水下超疏油乳液分离膜，并通过聚丙烯酰胺（PAAm）改性提高了涂层的鲁棒性。制备的ldhs - cpp - paam膜具有优异的分离性能，对各种模拟乳剂的分离效率均超过99.7 %。通过控制包覆量对制备方法进行优化，在保持高渗透性的同时获得了良好的分离稳定性。此外，ldhs - cpp - paam膜具有可靠的光致自清洁性能，可有效去除吸附在膜表面的水溶性有机污染物，恢复其在光照射下的超疏油性。这种光诱导的自清洁特性延长了膜的使用寿命，特别是在处理复杂的水包油乳液时。机械性能测试表明，PAAm的加入显著提高了膜的耐久性，使其在多次使用和磨损循环中保持完整性。该研究为开发高效、可持续的油水分离膜材料提供了新途径，为光催化技术在环境领域的应用提供了新思路。

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来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.