二氧化钛光催化氧化水中天然有机物富里酸

TiO_2 Photocatalytic Oxidation for Natural Organic Matter of Fulvic Acid in Water

以p-25型纳米TiO2为催化剂对富里酸（fulvic acid,FA）进行了光催化氧化的试验研究。考察了光催化剂投加量,FA的初始浓度,pH值等因素对FA光催化去除效果的影响。结果表明：投加纳米TiO2作光催化剂后可使得FA的去除率由单使用紫外光照射的35%提高至92%~100%。本试验条件下,FA的光催化降解遵循一级反应动力学规律,光催化降解速率常数K值随着FA初始浓度的增大而减小,且分别在TiO2投加量为0.3 g/L和pH=7时有最大值,对处理后的水样进行三维荧光分析发现FA在光催化过程中没有转化成新的荧光物质。

The photocatalytic degradation of fulvic acid（FA） was investigated by using p-25 TiO2 as photocatalyst.Factors of removal efficiency such as photocatalyst quantity,the concentration of FA and pH value were studied.The results show that removal efficiency of FA can be enhanced to 92 %~100 %,which is higher than 35 % under non-catalyst conditions.In this study,the data of photocatalytic degradation of FA conform to the first-order reaction kinetics.The degradation rate constant K decreases with initial FA concentration increasing,and constant K has maximum value when TiO2 dosage is 0.3 g / L or pH is 7.00.The treated samples were analyzed by fluorescence spectrometer and found that FA didn＇t convert to new fluorescent matter.