锰离子掺杂纳米二氧化钛的制备及在造纸废水处理中的应用

PREPARATION OF NANO-SIZED TiO_2 DOPED WITH Mn^(2+) AND ITS APPLICATION IN THE TREATMENT OF PAPER-MAKING WASTEWATER

以无机盐无水四氯化钛为原料,采用溶胶-凝胶法制备的锰离子掺杂型纳米TiO2作为光催化剂,在高压汞灯的光源照射下对河北省某造纸厂废水进行光催化降解。考察Mn2+/TiO2光催化剂的热处理温度、掺杂量、用量及溶液pH值、光照时间等因素对废水COD降解率的影响。实验结果表明:经460℃热处理1h的Mn2+/TiO2光催化效果较好,在进水ρ(COD)为400 mg/L,初始pH值为4.0、光催化剂用量1.5g/L、光照时间9h条件下,COD去除率可达80.3%。经深度处理的造纸废水,可实现达标排放。

Nano-sized TiO2 photocatalysts doped with Mn^2＋ were prepared from the inorganic salt by the sol-gel method and used in the photocatalytic degradation of the wastewater from a paper making plant in Hebei Province. The removal rate of COD under different heat-treated temperature, doping amount and dosage of Mn^2＋/TiO2,the pH value of solution and UV radiation time were investigated for the treatment of the wastewater. The experiment results showed that Mn^2＋/TiO2 heat-treated for 1h had better photocatalytic effect. The removal rates of COD in the reaction solution reached 80.3% for the paper making wastewater with COD 400 mg/L, the amount of Mn^2＋/TiO2 = 1.5 g/L , solution pH = 4.0 and the time of reaction solution =9 h. At this condition, after the advanced treatment of the wastewater from the paper making plant, the effluent could meet the national standard.