Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 24, Pages 13353-13363Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am4043068
Keywords
core-shell nanocomposites; ultrathin layer coating; interface assembly; electrostatic interaction; selective photoredox
Funding
- National Natural Science Foundation of China (NSFC) [20903023, 21173045]
- Award Program for Minjiang Scholar Professorship
- Natural Science Foundation (NSF) of Fujian Province for Distinguished Young Investigator Grant [2012J06003]
- Program for Changjiang Scholars and Innovative Research Team in Universities [PCSIRT0818]
- Program for Returned High-Level Overseas Chinese Scholars of Fujian province
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
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Development of various strategies for controllable fabrication of core-shell nanocomposites (CSNs) with highly active photocatalytic performance has been attracting ever-increasing research attention. In particular, control of the ultrathin layer TiO2 shell in constructing CSNs in an aqueous phase is a significant but technologically challenging issue. Here, this paper demonstrates the interface assembly synthesis of CdS nanospheres@TiO2 core shell photocatalyst via the electrostatic interaction of negatively charged water-stable titania precursor with positively charged CdS nanospheres (CdS NSPs), followed by the formation of the ultrathin-layer TiO2 shell through a facile refluxing process in aqueous phase. The as-formed CdS NSPs@TiO2 core shell nanohybrid exhibits a high visible-light-driven photoactivity for selective transformation and reduction of heavy metal ions. The ultrathin TiO2 layer coated on CdS NSPs results in excellent light transmission property, enhanced adsorption capacity, and improved transfer of charge carriers and lifespan of photoinduced electron hole pairs, which would prominently contribute to the significant photoactivity enhancement. It is anticipated that this facile aqueous-phase synthesis strategy could be extended to design a variety of more efficient CSN photocatalysts with controllable morphology toward target applications in diverse photoredox processes.
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