Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 8, Issue 3, Pages 1025-1040Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9tc05504e
Keywords
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Funding
- National Natural Science Foundation of China (NSFC) [21878257, 51402209, 21276220]
- Natural Science Foundation (NSF) of Shanxi Province [201601D102020, 201701D221083]
- Key Research and Development Program of Shanxi Province [201603D121017, 201803D421079, 201803D31042]
- Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi [2016124]
- Shanxi Provincial Key Innovative Research Team in Science and Technology [201605D131045-10]
- Jiangsu Collaborative Innovation Center for Ecological Building Materials and Environmental Protection Equipment
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province [JH201817]
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Environmental contamination, especially water pollution, is acknowledged as one of the most urgent global challenges. In essence, surface reactive oxygen species (ROS) is crucial for the photocatalytic degradation of organic pollutants in wastewater. Recently, the direct conversion of clean and renewable solar energy to heat to drive the activation process of oxygen is a highly effective and desirable way to use solar energy. However, it still remains a challenge to develop a flexible and versatile method to enhance the efficiency of photocatalysis. Herein, we report a new strategy for designing and constructing a C@TiO2 yolk-shell (YS) heterostructure with excellent photo-thermal conversion ability to achieve highly photo-thermal catalytic degradation of RhB under visible light irradiation, consisting of a tunable hydrothermal carbon sphere (CS) core covered by TiO2 shells. This approach integrates the hetero-interfacial charge carrier management, the photothermal excitation of the CS core and the injection of hot electrons into the TiO2 shells, leads to reliably boosted hot electron generation and transfer, and further promotes the activation of dissolved oxygen in water, consequently enhancing the visible light driven catalysis. The YS architecture and the photothermal effect interplay of the C@TiO2 heterostructure are comprehensively studied and optimized. Such a YS heterostructure photo-thermocatalyst concept provides a novel approach for effective utilization of solar energy, and coupling with the CS photothermal effect in a traditional catalytic process is a promising strategy for large-scale environmental and energy applications.
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