Abstract
The geometric parameters show great impacts on the properties of photoactivity materials. Herein, the geometric effects on photoluminescence and photodegradation of yolk shell structure were discussed through TiO2@void@TiO2:Eu3+ structure with simply adjusted cavity and shell thickness. The TiO2@void@TiO2:Eu3+ materials showed characteristic red-light emission of Eu3+. The emission intensity showed an increased and then decreased trend with the increase of titania source dosage. The tetracycline (TC) degradation could achieve the completed decomposition with 95.5 % total organic carbon removal efficiency within only 50 min. It was proved that the charge interaction between the core and shell is the main factor of thin shell and cavity samples. For samples with large cavity volume and thick shell, the light scattering and accommodation space of intermediates provided by cavity are the major factors. The TC degradation mechanism, possible degradation pathway, the major reactive oxidation radical and toxicity of products were also discussed in detail. This study not only provides an in-depth opinion on the geometric effects on yolk shell multi-functional photocatalysts and structure design of yolk shell structure but also offers a highly efficient way of water purification.
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