高级氧化技术降解人工甜味剂糖精钠

分别应用TiO2光催化氧化和Photo—Fenton氧化两种高级氧化技术降解环境新型污染物——人工甜味剂糖精钠（SaccharinSodium，SAC）。通过高效液相色谱（HPLC）检测糖精钠浓度，结果表明两种方法都可以有效降解糖精钠，TiO2光催化降解过程符合一级降解动力学，并得出该体系最佳条件：500W汞灯、0．04gTiO2和DH=7。Photo．Fenton体系降解速率受糖精钠的初始浓度、H2O2浓度和Fe2＋浓度配比的影响，体系的最佳浓度配比为：CSAC：CH202：CF,e2＋=5：60：1；降解过程中总有机碳逐渐降低，最终降至92％左右，说明降解过程中有机物被矿化或被转化为CO2。

Degradation of Artificial Sweetener Saccharin Sodium by Advanced Oxidation Technology

The advanced oxidation processes of photocatalytic oxidation and Photo-Fenton oxidation were used in degradation of emerg- ing pollutants artificial sweetener saccharin sodium. The concentration of saccharin sodium was determined by HPLC. The results showed both photocatalytic oxidation and Photo-Fenton oxidationcan had an effective degradation of saccharin sodium. The degrada- tion process was followed the first-order reaction. The best conditions of photocatalytic oxidation system： 500W mercury lamp, 0.04 g TiO2 and pH=7, and the best concentration ratio ofphoto-Fenton was csac ： cn2o2 ： CFe：~＋ = 5 ： 60 ： 1. The total organic carbon （TOC） of sample has significantly reduced to about 92 % by the two systems, which shows that the organics have been transformed to COz or mineralized during the degradation process.