碳点/银复合结构的制备及可见光催化性能  

Synthesis and Photocatalytic Properties of the Composites Between Carbon Dots and Silver Nanostructures

作　　者：武玲玲[1] 田瑞雪[1] 赵清[1] 常青[1] 胡胜亮[1] 

机构地区：[1]中北大学材料科学与工程学院,太原030051

出　　处：《高等学校化学学报》2014年第4期717-723,共7页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:51272301;51172214;51172120);中国博士后基金(批准号:2012M510788;2013T60269);山西省高等学校优秀青年带头人计划;科技部创新方法工作专项项目(批准号:2011IM030800);清华大学新型陶瓷与精细工艺国家重点实验室开放基金资助~~

摘　　要：分别采用原位复合和简单混合方法制备了碳点/银(CDs/Ag)复合结构.原位复合的CDs/Ag对光的吸收和对亚甲基蓝的降解都高于简单混合的CDs/Ag.研究了H2O2和碳点荧光强度对CDs/Ag原位复合结构的影响.结果表明,H2O2的加入量会改变CDs/Ag原位复合结构的形貌与光吸收,从而导致不同的光催化性能;用强荧光发射的碳点原位制备的CDs/Ag复合结构具有更好的光吸收特性和更高的光催化活性.CDs/Ag原位复合结构具有高催化活性是由于碳点与纳米银间形成了强化学键,有利于等离子共振效应发生,从而促使了光的吸收及能量转化效率的提高.The composites between carbon dots and silver nanostructures （ CDs/Ag ） were synthesized by in-situ synthesis and simple mixing, respectively. The products obtained by in-situ synthesis exhibit stronger light absorption and higher photocatalytic activity for methylene blue（ MB） degradation than those of simple mixing. The effects of H2 O2 addition and the fluorescence intensity of CDs on photocatalytic activities of the obtained CDs/Ag were analyzed. The experimental results indicate that the amount of H2 O2 addition can change the morphology and light absorption of CDs/Ag, and then results in different photocatalytic performances. On the other hand, the CDs/Ag obtained from CDs with stronger fluorescence emission shows stronger light absorption and higher photocatalytic activities. The possible mechanism of photocatalytic activities of the in-situ synthe-sized CDs/Ag could be that strong combination between CDs and Ag nanocrystals induced much stronger sur-face plasma resonance, thus enhancing light absorption and the light energy conversion efficiency.

关 键 词：碳点 银纳米结构 原位复合 光催化性能 

分 类 号：O613[理学—无机化学] O644[理学—化学]