改性纳米TiO_2光催化降解苯酚活性的研究

Research of Photocatalytic Degradation of Phenol by Nanometer Titanium Dioxide Modified with Nickel

在装有紫外光的光催化反应器中,用锐钛型纳米TiO2为光催化剂,进行了苯酚水溶液的光催化降解性能的研究。考察了溶液的pH值、纳米TiO2用量、镍(Ni2+)掺杂量、苯酚的初始质量浓度等因素对苯酚水溶液光催化降解过程的影响。结果表明,在pH值为7时,苯酚水溶液的降解率达95%以上,强酸和强碱条件均不利于苯酚的降解。当TiO2用量为50mg,UV辐照40min时,200mL质量浓度为50mg/L的苯酚水溶液的降解率为96·3%;当TiO2用量为150mg,UV辐照60min时,200mL质量浓度100mg/L的苯酚水溶液的降解率为95·8%。镍掺杂增加了TiO2的光催化活性,用质量分数为10%的二氯化镍水溶液掺杂制备的复合光催化剂,苯酚水溶液的降解率比未掺杂时增加13·6%。

Photocatalytic degradation of phenol solution by anatase nanometer titanium dioxide as catalyst was carfled out in a UV photoreactor. Effects of some important factors, such as pH value, quantity of titanium dioxide and nickel, and initial mass concentration of phenol, on the process of photocatalytic degradation were investigated. The experimental results showed that high degradation rate 95 % above could be reached when the pH value of the solution was about 7, the quantities of titanium dioxide were 50-150mg, the initial mass concentrations of phenol solutions were 50-100mg/L, and the time of UV radiation was 40-60min. Ni- adulterating improved the photo- catalytic activity of titanium dioxide. Using the compound photocatalyst adulterating 10 % （w） nickel dichloride, the degradation rate of phenol solution increased 13.6% compared with non-modified photocatalyst.