关键词: 层状双氢氧化物;二氧化钛;溶胶-凝胶法;载体;光催化

Abstract: Basing on the carrier of MgAl-CO3-LDH and the hydrolysis of tetra-n-butyl titanate,TiO2/layered double hydroxide (TiO2/LDH )was prepared by loading nano TiO2 on LDH layers via sol-gel method. Photocatalyst of TiO2/LDO was obtained by calcination TiO2/LDH. Influences of dosage of TiO2/LDO,pH and illumination time on photocatalytic properties were studied by photocatalytic degradation of the simulated dye pollutants of methylene blue solution under UV light (λ =291 nm ) irradiation. The results indicate that dispersity of nano TiO2 (<10 nm)can be improved by sol-gel method. The weight loading amout of TiO2 on LDH was about 8. 01wt%(in weight)in TiO2/LDH. The photocatalytic property of TiO2/LDO is higher than that of LDO. The loading TiO2 and the LDO layers have a synergistic photocatalytic effect on degradation of methylene blue. When 0. 20 g TiO2/LDO was added in the 80 mL methylene blue solution(pH=9)at concentration of 5 mg/L for 8 h,the degradation rate of methylene blue reached 81. 7%. The photocatalytic reaction of TiO2/LDO on methylene blue coincides with the first order kinetics equation.

Key words: layered double hydroxide;TiO2;sol-gel method;carrier;photocatalysis