摘要
采用可控的电泳沉积法制备了结合力强、光催化效率高的石墨烯量子点(GQDs)修饰的TiO_2纳米线(TNWs)壳核结构复合材料。在模拟太阳光下,GQDs/TNWs壳核结构复合材料光催化还原Cr(VI)的反应速率较纯TNWs提升了48%,其光催化活性提升的主要原因可归结为:GQDs作为敏化剂提高复合材料的光谱吸收能力;GQDs超好的导电性促进界面间光生电子的传输;核壳结构使GQDs与TNWs两相间具有最大的接触面积,进一步促进载流子的分离。GQDs/TNWs壳核结构复合材料不仅展现出较强的还原Cr(VI)能力,而且对新型层状光催化材料的设计提供了新的思路。
A novel shell/core nanocomposite of graphene quantum dots （ GQDs） modified Ti02 nano wire arrays （ T N W s ） was fabrica-ted using controllable electrophoretic deposition method with high binding power and enhanced photocatalytic efficiency. Compare with pure TNWs,the photocatalytic activities to reduce aqueous Cr（VI）of shell/core GQDs/Ti02NWs increases by48%under sim-ulated sunlight. The main reasons are as follows,GQDs serve as photosensitizer for enhancing spectral absorption of composite, the excellent conductivity of GQDs accelerates efficient transport of photon-generated electrons, the shell/core structure maximizes the interfacial contact between Ti02 and GQDs which further retards the recombination rate of photo-induced charge carriers. This novel shell/core nanostructure can hence not only exhibit a great potential for the reduction of Cr（VI） ,but also offer a blueprint for the future design of photocatalysts.
出处
《化学研究与应用》
CSCD
北大核心
2017年第11期1738-1742,共5页
Chemical Research and Application
基金
河南省科技计划项目(172102210429)资助
