纳米金/琼脂糖复合凝胶制备及其催化性能  

Preparation and catalytic property of gold nanoparticles-agarose gel

作　　者：吴江渝[1] 李竹[1] 胡易然 许谦[1] 

机构地区：[1]武汉工程大学材料科学与工程学院,湖北武汉430074

出　　处：《武汉工程大学学报》2014年第9期42-48,共7页Journal of Wuhan Institute of Technology

基　　金：国家自然科学基金项目(51003081)

摘　　要：以琼脂糖作为模板、稳定剂和还原剂,通过一步法合成了纳米金粒子及纳米金/琼脂糖复合凝胶,对纳米金粒子进行了表征,并以对硝基苯酚催化还原为模型反应研究了纳米金/琼脂糖复合凝胶的催化性能.结果表明,纳米金粒子为球状,粒径为1～10 nm,分布较均一;纳米金/琼脂糖复合凝胶表现出明显的催化活性,在实验条件下完全反应时间约为30 min.在重复利用实验中,该复合凝胶的催化性能随使用次数增多有一定下降.通过琼脂糖和氯金酸一步法制备纳米金/琼脂糖复合凝胶,方法简单、使用方便、后处理容易,为新型纳米金属催化剂的设计、合成及应用提供了新的思路.Gold nanoparticles and nanogold/agarose composite gel were prepared in a one-step process using agarose as template, stabilizer and reducing agent. The gold nanoparticles were characterized and the catalytic activity of the composite gel was investigated using the reduction of p-nitrophenol as the model reaction. The result shows that the majority of gold nanoparticles are spherical with 1-10 nm in diameter and distributed even- ly; the nanogold/agarose composite gel shows good catalytic activity and the reaction finishes in 30 min in ex perimental conditions, but the catalytic activity of the composite gel declines in recycling assay. It indicates that the preparation of nanogold/agarose composite gel has advantages of facile synthesis, easy handling and conven ient recycling, which provides a new way for design, synthesis and application of metal nano-catalysts.

关 键 词：琼脂糖 纳米金粒子 复合凝胶 对硝基苯酚 催化剂 

分 类 号：O614.123[理学—无机化学]