Abstract
In order to enhance mass transfer based on immobilizing and recycling TiO2 particles in the process of photocatalysis, porous Zr-doped SiO2 shell/TiO2 core nanoparticles with expanded channels (EC-ZSTs) were fabricated through cohydrolysis between TEOS and ZrOCl2·8H2O using nonionic surfactant P123 ((EO)20(PO)70(EO)20) as a template and xylene as a swelling agent in the presence of inorganic salts, followed by etched with NaHCO3 solution for further expanding channels. The preparation conditions of EC-ZSTs were optimized and the photocatalytic activities were studied by photodegrading methyl orange solution. Then the EC-ZSTs were characterized by SEM, TEM and BET. The results show that EC-ZSTs with the diameter of 869nm have a regular porous structure. The pore diameter of EC-ZSTs is 7.5nm; while the pore diameter of particles without expanded channels is 5.5nm. Alternatively, EC-ZSTs also present the better photocatalytic activity in treating wastewater containing oil compared with the particles without expanded channels due to improving mass transfer. Therefore, the EC-ZSTs with enhancing mass transfer and photocatalytic activity have a promising application in TiO2 immobilization and water cleaning.
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