Reduction of Hexavalent Chromium Using Recyclable Pt/Pd Nanoparticles Immobilized on Procyanidin-Grafted Eggshell Membrane
Reduction of Hexavalent Chromium Using Recyclable Pt/Pd Nanoparticles Immobilized on Procyanidin-Grafted Eggshell Membrane
复制标题
使用固定在原花青素接枝蛋壳膜上的可回收 Pt/Pd 纳米颗粒还原六价铬
DOI：
10.1021/ie5021552
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发表时间：
2014-09-03
影响因子：
4.2
通讯作者：
He, Zhimin
中科院分区：
文献类型：
--
作者：
Liang, Miao;Su, Rongxin;He, Zhimin
将催化活性金属纳米颗粒有效地固定到多孔载体材料中在实践中具有重要的科学意义。我们报告了新型生物纳米复合材料的制造，包括三维多孔蛋壳膜（ESM）生物支架装饰有催化活性金属（Pt，Pd）纳米粒子，以减少高毒性的Cr（VI）。原花青素（Pro）是一种含有丰富酚羟基的天然植物多酚，首次被共价接枝到ESM纤维表面，为螯合金属前体提供稳定的结合位点。通过NaBH4还原，可在ESM表面制备出粒径小、分散性好的Pt、Pd纳米粒子。这些金属纳米粒子纳入ESM复合材料的活性非均相催化剂，用于还原有毒的Cr（VI）的Cr（III），通过采用甲酸作为还原剂。催化剂易于回收和循环使用，表明原花青素接枝物具有良好的稳定性。
Efficient immobilization of catalytic active metal nanoparticles into porous supporting materials is of important scientific interest in practice. We report on the fabrication of novel bionanocomposites, comprising a three-dimensional porous eggshell membrane (ESM) bioscaffold decorated with catalytic active metal (Pt, Pd) nanoparticles, to reduce highly toxic Cr(VI). Procyanidin (Pro), a natural plant polyphenol with abundant phenolic hydroxyls, was first covalently grafted on the ESM fiber surface to provide stable binding sites for chelating metal precursors. Highly dispersed Pt and Pd nanoparticles with small size were facilely generated and stably immobilized onto the surface of ESM followed by NaBH4 reduction. These metal nanoparticle-incorporating ESM composites were active heterogeneous catalysts for the reduction of toxic Cr(VI) to Cr(III) by employing formic acid as the reducing agent. Notably, it is easy to recover and recycle the catalysts, revealing the good stabilization of procyanidin-graft...