Coral-inspired “nanotentaclization” porous composite gel for efficient removal of Lead(II) from aqueous solution
Coral-inspired “nanotentaclization” porous composite gel for efficient removal of Lead(II) from aqueous solution
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受珊瑚启发的“纳米触手”多孔复合凝胶，可有效去除水溶液中的铅 (II)
DOI：
10.1016/j.matdes.2020.109072
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发表时间：
2020-08
影响因子：
8.4
通讯作者：
Zhu Beiwei
中科院分区：
文献类型：
--
作者：
Cheng Jiahui;Gao Meiling;Yang Lin;Zhang Lijing;Zhu Beiwei
比表面积和活性基团是设计和合成金属离子吸附剂的主要考虑因素。受珊瑚在海洋中捕食微小浮游生物的高效率启发，我们开创了一种基于原始多孔材料骨架原位构建“纳米触角”的简单方法。“纳米触角”的引入可以进一步重新设计和重塑现有的互连孔，以增加目标金属离子的比表面积和特异性螯合位点。在此，通过在壳聚糖/氧化石墨烯复合凝胶（CGG）的多孔结构的内壁上原位生长（3-氨丙基）三甲氧基硅烷（APS）来说明概念验证设计。所得材料（NT-CGG）的分配系数（Kd）为1.25 × 108 mL g−1，对铅离子表现出亲电子性，吸附容量可达470 mg g−1。更重要的是，NT-CGG在穿透实验中可以有效地将铅从10 ppm去除到不可检测的水平（≤0.02 ppb），去除效率≥99.9998%。本文提出的方法可广泛应用于大多数现有多孔材料的再设计和再成型。
Specific surface area and active groups are major concerns in the design and synthesis of metal ion adsorbent. Inspired by coral's high efficiency in preying on tiny plankton in the ocean, we pioneered a simple method for the in situ construction of “nano-tentacles” based on the original porous material skeleton. The introduction of “nano-tentacles” can further redesign and remolding of the existing interconnected pores to increase the specific surface areas and specific chelating sites for target metal ions. Herein, a proof-of-concept design is illustrated by in situ growing (3-aminopropyl)trimethoxysilane (APS) on the inner wall of the porous structure of chitosan/graphene oxide composite gel (CGG). The resulting material (NT-CGG) has a distribution coefficient (Kd) of 1.25 × 108mL g−1, which exhibits ultrahigh affinity for lead ions, and the uptake capacity can reach 470 mg g−1. More significantly, the NT-CGG can effectively remove lead from 10 ppm to undetectable levels (≤0.02 ppb) with remove efficiency ≥99.9998% in the breakthrough experiment. The method proposed in this paper may be widely applicable to the redesign and remolding of most existing porous materials.
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