Fenton氧化降解水中磺胺甲恶唑的研究

Study on Oxidative Degradation of Sulfamethoxazole in Water by Fenton Method

以COD为评价指标,考察了Fenton氧化法对水中磺胺甲噁唑(SMX)去除效果。通过探讨H_(2)O_(2)投加量、Fe^(2+)投加量以及溶液初始pH对COD去除的影响,确定了Fenton去除SMX的优化工艺条件为:pH=3,H_(2)O_(2)投加量为10 mmol/L,Fe^(2+)投加量为1.0 mmol/L,在该条件下,COD去除率可达71.8%。与经典动力学相比,伪动力学模型能很好拟合SMX的去除过程,其中伪二级动力学模型的相关系数为0.9999。此外,根据GC/MS分析结果,推测了SMX可能的降解途径。

Using COD as the evaluation index,the removal efficiency of sulfamethoxazole(SMX)by Fenton oxidation method was investigated.According to the effects of H_(2)O_(2)dosage,Fe^(2+) dosage,and initial pH of the solution on COD removal,the optimal process conditions were determined,and the details were as follow:pH=3,H_(2)O_(2)dosage 10 mmol/L,Fe^(2+)dosage 1.0 mmol/L.And the removal efficiency of COD under optimal process conditions was 71.8%.Compared with classical kinetics models,the SMX removal followed pseudo-kinetic models better,and the correlation coefficient of the pseudo-second-order kinetic model was 0.9999.In addition,the potential degradation pathway of SMX was also speculated based on the results of GC/MS.