Achieving Enhanced Visible-Light-Driven Photocatalysis Using Type-II NaNbO3/CdS Core/Shell Heterostructures

被引:149
作者
Kumar, Sandeep [1 ,2 ]
Khanchandani, Sunita [2 ]
Thirumal, Meganathan [1 ]
Ganguli, Ashok K. [2 ,3 ]
机构
[1] Univ Delhi, Dept Chem, Delhi 110007, India
[2] Indian Inst Technol, Dept Chem, Delhi 110016, India
[3] Habitat Ctr, Inst Nano Sci & Technol, Mohali 160062, Punjab, India
关键词
NaNbO3; CdS; photocatalysis; type-II band alignment; methylene blue; core/shell; heterostructures; MULTIPLE EXCITON GENERATION; ELECTRONIC-STRUCTURE; ASSISTED SYNTHESIS; QUANTUM DOTS; SEMICONDUCTOR; DEGRADATION; NANOCRYSTALS; GROWTH; OXIDE; EFFICIENT;
D O I
10.1021/am503055n
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Expanding the light-harvesting range and suppressing the quick recombination of photogenerated charge carriers are of paramount significance in the field of photocatalysis. One possible approach to achieve wide absorption range is to synthesize type-II core/shell heterostructures. In addition, this system also shows great promise for fast separation of charge carriers and low charge recombination rate. Herein, following the surface functionalization method using 3-mercaptopropionic acid (MPA) as a surface fiinctionalizing agent, we report on designing NaNbO3/CdS type-II core/shell heterostructures with an absorption range extending to visible range and explore the opportunity toward degradation of methylene blue (MB) dye as a model pollutant under visible light irradiation. Characterizations including X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), UV-vis diffuse reflectance spectrum (DRS), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), and Raman spectroscopy support the growth of CdS shell onto NaNbO3 nanorods. The resulting core/shell heterostructures unveiled high surface areas, enhanced light harvesting, and appreciably increased photocatalytic activity toward MB degradation compared to individual counterparts and the photocatalytic standard, Degussa P25, under visible light irradiation. The remarkably enhanced photocatalytic activity of core/shell heterostructures could be interpreted in terms of efficient charge separation owing to core/shell morphology and resulting type-II band alignment between NaNbO3 and CdS, which creates a step-like radial potential favoring the localization of one of the carriers in the core and the other in the shell. A plausible mechanism for the degradation of MB dye over NaNbO3/CdS core/shell heterostructures is also elucidated using active species scavenger studies. Our findings imply that hydroxyl radicals (OH center dot) play a crucial role in dictating the degradation of MB under visible light. This work highlights the importance of core/shell heterostructures in leading toward new paradigms for developing highly efficient and reusable photocatalysts for the destructive oxidation of recalcitrant organic pollutants.
引用
收藏
页码:13221 / 13233
页数:13
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