Au、Ag／氧化石墨烯复合催化体系的制备及催化性能研究  

Preparation of Au、Ag/graphite oxide composite catalyst and its catalytic property

作　　者：陈晨[1,2] 李瑶[1,2] 焦胜江 武晓东[1] 卑凤利[1,2] 

机构地区：[1]南京理工大学化工学院,南京210094 [2]国家民用爆破器材质量监督检验中心,南京210094

出　　处：《化工新型材料》2015年第4期125-128,共4页New Chemical Materials

基　　金：中央高校基本科研基金(NUST2011ZDJH03);江苏公安科研基金(201201004TJ)

摘　　要：以氧化石墨(GO)为载体,利用两步法制备了一种表面相对"清洁"的负载型纳米催化剂(Au/GO)。通过控制电解质与纳米粒子的比例,可得到一系列团聚体大小不同的Au/GO。以NaBH4作为还原剂催化还原对硝基苯酚来评价Au/GO的催化活性,并且用紫外-可见光谱仪跟踪测试反应进度。结果表明,经过电解质处理后,负载型Au纳米的表面活性剂量会有所降低并暴露出更多的"活性位点",故Au/GO与未负载的Au相比,催化活性明显提高。更有趣的现象是当纳米团聚体尺寸较小时,Au/GO表现出较高的催化活性,说明了团聚体状态对催化活性有显著的影响作用。A facile,two-step strategy was utilized for anchoring gold nanoparticles（Au NPs）onto the surface of gra- phene oxide（GO）nanosheets by simply adding some specific electrolyte solution into GO suspension in the presence of gold colloid. The catalytic activities were obtained upon in-situ monitoring the reduction of p-nitrophenol to p-aminophenol by UV-Vis spectroscopy. The results showed that the immobilized Au NPs displaied a maximum number of exposed ＂active- sites＂ due to the absence of any other surfactants or protecting ligands on their surfaces and therefore superb catalytic activ- ities for the reduction. Interestingly the reduction rate catalyzed by Au/GO nanocomposites in small aggregates was faster than the others, suggesting the aggregate size had a significant impact on catalytic activity.

关 键 词：纳米金 纳米复合材料 团聚体大小 催化活性 

分 类 号：TB383.1[一般工业技术—材料科学与工程] O643.36[理学—物理化学]