光电芬顿矿化草甘膦有机废水

Mineralization of pesticide glyphosate wastewater by photoelectro-Fenton process

以有机磷农药-草甘膦为目标污染物,利用光电芬顿方法对其进行降解研究。研究汇总考察了电流强度、初始p H、Fe2+浓度、草甘膦初始浓度、光种类及通入背景气体种类对草甘膦降解效果的影响。实验结果表明:电流强度越大,草甘膦初始浓度越低,草甘膦降解效果越好;草甘膦在p H=2.0~3.0的酸性体系中降解效果最好;Fe2+浓度升高,草甘膦降解效果增强。在电流为0.36 A、初始p H=3.0、Fe2+浓度为1.0 mmol·L^(-1)、通入100 m L·min-1O2条件下,以365 nm紫外光照射的光电芬顿反应降解初始浓度为84.5 mg·L^(-1)的草甘膦溶液,处理360 min后溶液矿化率可达64.5%。

Effects of current density,initial p H,Fe2 ＋concentration,initial glyphosate concentration,irradiation source,and input gas on GS degradation by the photoelectro-Fenton（ PEF） process were discussed. The results showed that better GS degradation was achieved with a higher current density and a lower initial concentration of GS; higher degradation in the PEF system was achieved when the initial p H was 2. 0 to 3h. 0; degradation of GS was enhanced when the Fe2 ＋concentration increased. Under the optimum conditions of 0. 36 A,p H =3. 0,1. 0 mmol·L^（-1）Fe2 ＋,100 m L·min- 1O2,when the initial GS concentration was 84. 5 mg·L^（-1）,the electro-Fenton along with UVA irradiation process can mineralize GS efficiently,and the TOC removal is up to64. 5% after 360 min of treatment.