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以自制TiO2为光催化剂,在紫外光和可见光照射下,研究甲基橙(MO)-Cr(VI)复合体系的光催化反应。讨论了复合体系MO和Cr(VI)的质量配比、体系pH值、入射光波长、TiO2用量、焙烧温度以及改性TiO2对MO-Cr(VI)复合体系光催化的影响。结果表明:复合体系光催化受MO-Cr(VI)质量配比、入射光波长、体系pH值和TiO2焙烧温度影响较大。Cr(VI)-MO质量配比在2/3～2/5时二者光催化协同作用效果最好。复合体系下MO和Cr(VI)的光催化效果比单一体系有较大提高。可见光下,单一体系基本无反应,而复合体系可以顺利进行。体系pH=1,40mg/L MO和20 mg/L Cr(VI)组成的50mL混合液,采用80mg(1.6 g/L)550℃焙烧的TiO2,λ≥420 nm可见光催化下,MO 40min完全脱色,Cr(VI)70 min完全被光催化还原。
The photocatalytic reaction of methyl orange (MO) -Cr (VI) composite was studied by self-made TiO2 as photocatalyst under ultraviolet and visible light irradiation. The effects of mass ratio of MO and Cr (VI), pH value, wavelength of incident light, TiO2 dosage, calcination temperature and modified TiO2 on the photocatalytic activity of MO-Cr (VI) composite were discussed. The results show that the photocatalytic activity of the composite system is greatly affected by the mass ratio of MO-Cr (VI), the wavelength of incident light, the pH value of the system and the calcination temperature of TiO2. Cr (VI) -MO mass ratio of 2/3 to 2/5 both photocatalytic synergy best. The photocatalytic activity of MO and Cr (VI) in the composite system is much higher than the single system. Under visible light, a single system basically no response, and the composite system can be carried out smoothly. 50 mL of a mixture of pH = 1, 40 mg / L MO and 20 mg / L Cr (VI) was prepared. 80 mg (1.6 g / L) , Cr (VI) 70 min completely photocatalytic reduction.