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In order to improve the photocatalytic degradation efficiency of nano-TiO 2 , reduce its usage and realize recycling and reuse, CaCO 3 -TiO 2 composite photocatalyst was prepared with calcium carbonate (CaCO 3 ) and TiO 2 in a grinding machine through the integration of grinding depolymerization, dispersion and particle composition. The photocatalytic degradation performance, recycling performance, structure and morphology of CaCO 3 -TiO 2 were studied. The interaction mechanism between CaCO 3 and TiO 2 and the improvement mechanism for the photocatalytic performance of TiO 2 were also discussed. The results show that under the UV light irradiation for 20 and 40 min, the degradation efficiency of methyl orange by the composite photocatalyst with 40% TiO 2 (mass fraction) was 90% and 100%, respectively. This was similar to that of pure TiO 2 , and the performance of the composite photocatalyst was almost unchanged after five cycles. CaCO 3 -TiO 2 is formed by the uniform loading of nano-TiO 2 particles on the CaCO 3 surface, and the nano-TiO 2 particles are well dispersed. Due to the facts that the dispersion of nano-TiO 2 is improved in the presence of CaCO 3 and the charge transport capability is improved through the interfacial chemical bonds between CaCO 3 and TiO 2 , the formation of this complex is an intrinsic mechanism to improve the photocatalytic efficiency of nano-TiO 2 and reduce its usage in application processes.

Preparation and Properties of CaCO3-Supported Nano-TiO2 Composite with Improved Photocatalytic Performance