Gold nanoparticle embedded hydrogel matrices as catalysts: Better dispersibility of nanoparticles in the gel matrix upon addition of N-bromosuccinimide leading to increased catalytic efficiency
Gold nanoparticle embedded hydrogel matrices as catalysts: Better dispersibility of nanoparticles in the gel matrix upon addition of N-bromosuccinimide leading to increased catalytic efficiency
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DOI：
10.1016/j.colsurfa.2012.08.026
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发表时间：
2012-11-20
影响因子：
5.2
通讯作者：
Prasad, B. L. V.
中科院分区：
文献类型：
--
作者：
Ramtenki, Vilas;Anumon, V. D.;Prasad, B. L. V.
提出了一种简单方便的制备金纳米粒子并将其固定到聚乙二醇-聚氨酯（PEGPU）基质中的方法。金NP固定化PEGPU（Au NP-PEGPU）水凝胶基质易于处理并且可用作催化剂。以4-硝基苯胺（4 NA）在催化剂存在下被硼氢化钠还原为对苯二胺（p-PDA）为实验反应，考察了Au NP-PEGPU催化剂基质的效率、重复使用性和耐久性。在PEGPU基质中的Au NPs在3个催化循环后聚集，但分散体可以通过添加N-溴代琥珀酰亚胺（NBS）再生。在该再生过程之后，Au NPs-PEGPU基质显示出优异的效率，没有任何聚集、浸出或降解。催化剂的重复使用性为28个周期，产生的总周转数为3220和周转频率为0.152秒（-1）被证明。(C)2012爱思唯尔有限公司版权所有。
A simple and convenient method for generating and immobilizing gold NPs into polyethylene glycol-polyurethane (PEGPU) matrices is presented. The gold NP immobilized PEGPU (Au NP-PEGPU) hydrogel matrices are easy to handle and can be used as catalysts. The efficiency, reusability and durability of the Au NP-PEGPU catalyst matrices were investigated using the reduction of 4-nitroaniline (4NA) to p-phenylenediamine (p-PDA) by sodium borohydride in the presence of the catalyst as a test reaction. The Au NPs in the PEGPU matrix got aggregated after 3 cycles of catalysis but dispersion could be regenerated by the addition of N-bromosuccinimide (NBS). After this regeneration process the Au NPs-PEGPU matrix showed excellent efficiency without any aggregation, leaching or degradation. The reusability of the catalyst for 28 cycles yielding a total turnover number of 3220 and turn over frequency of 0.152 s(-1) is demonstrated. (C) 2012 Elsevier B.V. All rights reserved.