【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TiO₂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。更多还原

【Abstract】 A novel shell/core nanocomposite of graphene quantum dots（GQDs）modified TiO₂ nanowire arrays（TNWs）was fabricated 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/TiO₂ NWs increases by 48%under simulated 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 TiO₂ 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.更多还原