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Homemade modified TiO_2 visible degradation of methylene blue on

Author: LiuWeiNa
Tutor: WangLiHua
School: Liaoning Technical University
Course: Environmental Engineering
Keywords: Photocatalytic Sol - Hydrothermal Visible Methylene blue Doped lanthanum
CLC: X13
Type: Master's thesis
Year: 2009
Downloads: 116
Quote: 0
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Abstract


In order to improve the photocatalytic activity of pure TiO2 and visible light utilization, effective treatment of refractory organic wastewater, paper, and La -doped Fe-doped modification methods . By sol - Hydrothermal doping Fe, La metal ion modified TiO2, and with the homemade pure TiO2 in the degradation were compared . Experimentally determined optimum ratio of the reactants ( volume ratio ) of ethanol : deionized water : acetic acid : butyl titanate = 10:2:1:2 , optimal hydrothermal temperature was 180 ℃, water and heat time of 8h, Fe3 optimum doping amount of 1.0% ( mole percent ), La3 the optimum doping amount of 1.0% ( mole percent ) . Adsorption on homemade TiO2 and photocatalytic performance studies to simulate methylene blue dye wastewater degradation as a target fluid simulation with ordinary incandescent visible light. The experimental results showed that: at 25 ℃, pH = 10, TiO2 dosage of 0.2g / L when, after about 2.5h, TiO2 on methylene blue adsorption reached equilibrium . Pure Ti02 saturated adsorption capacity of 14.81mg / L, iron-doped TiO2 for 16.13mg / L, lanthanum-doped TiO2 for 18.18mg / L. Homemade TiO2 on 5mg / L and 10mg / L of methylene blue can be fully absorbed. Degradation of TiO2 optimum conditions: irradiation time 4h, the solution pH = 10, catalyst dosage of 0.2g / L, methylene blue solution of initial concentration 5mg / L. In the best conditions, pure Ti02 degradation of methylene blue removal rate of 53.17 percent , iron-doped TiO2 on methylene blue removal rate of 67.38 percent , lanthanum-doped TiO2 on methylene blue solution rate can reach 77.76% . Experimental data to prove : doped with iron and lanthanum ions can increase the photocatalytic activity of TiO2 , and lanthanum-doped TiO2 photocatalytic activity than doped TiO2 photocatalytic activity .

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CLC: > Environmental science, safety science > The basic theory for the Environment and Science > Environmental Chemistry
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