Biomimetic Preparation of Hybrid Porous Adsorbents for Efficiently Purifying Complex Wastewater

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• 作者：Hongmin Wang ; Chan Wang ; Shengyang Tao ; Jieshan Qiu ; Yongxian Yu ; Minfen Gu
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：March 7, 2016
• 年：2016
• 卷：4
• 期：3
• 页码：992-998
• 全文大小：396K
• ISSN：2168-0485

文摘

Simulating the polymerization of polyphenol on a solid surface in nature, hybrid adsorbents were prepared by coating the hierarchically porous silica (HPS) with a poly(pyrogallol) (PG) layer. Such material has a macroporous skeleton and well-defined mesopores. During a facile and mild reaction, the poly-PG membrane is strongly binded to the pore surface of HPS through covalent and noncovalent interactions. High-performance adsorbents, HPS/PG, was obtained. It exhibits a large capability to adsorb various pollutants in wastewater, such as heavy metal ions (Hg²⁺, Pb²⁺, Cu²⁺, Ni²⁺, and CrO₄^2–), organic dyes, and pesticides. Specifically, HPS/PG showed a good purifying capacity toward the Hg²⁺ ion and neutral red, which could reach 157.2 and 671.1 mg g^–1, respectively. More than that, HPS/PG showed a good recovering ability with simulated wastewater with complex components. The removal rate for any of the pollutants was more than 98%. The high adsorption capability of HPS/PG should be due to the hierarchically porous structure and ideal surface coating, which combine the benefits of both physical and chemical adsorptions.