State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan610500, China.
College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan610500, China.
ACS Appl Mater Interfaces. 2021 Mar 10;13(9):11320-11331. doi: 10.1021/acsami.1c00697. Epub 2021 Feb 24.
As industrialization has spread all around the world, the problems of water pollution such as offshore oil spill and industrial sewage discharge have spread with it. Although many new separation materials have been successfully developed to deal with this crisis, a large number of water treatment materials only focus on the treatment of classified single water pollutant under mild conditions. It is a great challenge to treat soluble contaminants such as water-soluble dyes and insoluble contaminants, for example, emulsified oils simultaneously in a strong corrosive environment. Herein, in this work, corrosive resistance and multifunctional surface on a commercial polyvinylidene difluoride (PVDF) membrane via a tunicate-inspired gallic acid-assisted accurate-deposition strategy is created. Owing to the titanium-carboxylic coordination bonding and accurate-deposition strategy, the as-prepared membrane exhibits extraordinary stability, facing various harsh environmental challenges and incredibly corrosive situations (e.g., 4 M NaOH, 4 M HCl, and saturated NaCl solution). The robust multifunctional surface also endows commercial PVDF membrane with the ability for in situ separation and adsorption of surfactant-stabilized oil-in-water (corrosive and dyed) emulsions with high adsorption efficiencies up to 99.9%, separation efficiencies above 99.6%, and permeation flux as high as 15,698 ± 211 L/(m·h·bar). Furthermore, the resultant membrane can be regenerated facilely and rapidly by flushing a small amount of HCl (4 M) or NaOH (4 M), making the corrosive resistance membrane attain a long-term and high-efficiency application for complex dyed wastewater treatment. Therefore, the multifunctional membrane has a broad application prospect in the industrial field.
随着工业化在全球范围内的普及，水污染问题如海上溢油和工业污水排放等也随之蔓延。尽管已经成功开发了许多新型分离材料来应对这一危机，但大量水处理材料仅在温和条件下针对分类的单一水污染进行处理。在强腐蚀性环境中同时处理水溶性染料等可溶性污染物和不溶性污染物（例如乳化油）是一个巨大的挑战。在此，本工作通过贻贝启发的没食子酸辅助精确沉积策略在商业聚偏二氟乙烯（PVDF）膜上构建了耐腐蚀性和多功能表面。由于钛-羧酸配位键合和精确沉积策略，所制备的膜表现出非凡的稳定性，能够应对各种苛刻的环境挑战和极具腐蚀性的情况（例如 4 M NaOH、4 M HCl 和饱和 NaCl 溶液）。坚固的多功能表面还使商业 PVDF 膜能够原位分离和吸附表面活性剂稳定的水包油（腐蚀性和染色）乳液，吸附效率高达 99.9%，分离效率高于 99.6%，渗透通量高达 15,698 ± 211 L/（m·h·bar）。此外，通过冲洗少量的 HCl（4 M）或 NaOH（4 M）可以轻松快速地再生所得膜，使耐腐蚀性膜能够长期高效地应用于复杂染色废水处理。因此，多功能膜在工业领域具有广阔的应用前景。
