Preparation and Photocatalytic Performance of MgAl-LDHs/TiO2 Composite Photocatalyst
LIN Bowen1,2, XU Yidong1,*, YU Demi1,3
1 School of Civil Engineering and Architecture, NingboTech University, Ningbo 315100, Zhejiang, China 2 School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China 3 School of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310000, China
Abstract: Based on the memory effect of hydrotalcite (LDHs), MgAl-LDHs/TiO2 composites were synthesized. The materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and photoluminescence spectroscopy (PL). Using methylene blue (MB) as degradation material, the photocatalytic performance of MgAl-LDHs/TiO2 under simulated sunlight was studied and the reaction conditions were optimized. Based on first principles theory, the band structure and state density of the composite system were calculated at atomic scale. The main active groups in the photocatalytic process were investigated and the possible photocatalytic reaction mechanism was proposed. The results showed that the agglomeration phenomenon of TiO2in MgAl-LDHs/TiO2 composites was improved, the adsorption capacity of the composite was greatly enhanced, and the photocatalytic activity of the composite was significantly improved compared with that of TiO2. The degradation rate of methylene blue reached 95.3% within 40 min when the mass ratio of LDHs was 50% and the calcination temperature was 400 ℃. The main active groups in the photocatalytic reaction process are h+ and ·OH. The bandgap obtained by MgAl-LDHs/TiO2 simulation calculation is 1.67 eV which is an indirect bandgap semiconductor. The photoresponse principle is transferred from O 2p in VB to hybrid Ti 3d and Al 3p in CB.
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2023, Vol. 37 
