磺胺甲恶唑光降解影响因素研究

Factors of Influencing the Photodegradation of Sulfamethoxazole

探究了不同光源、不同pH值、不同初始浓度的磺胺甲恶唑(SMX),以及金属离子Fe(III)、Mn(II)、Cu(II)对SMX光降解的影响。结果表明:在加1.5AM滤光片的光照条件下,酸性条件低浓度的SMX的光降解效果较好;金属离子对SMX的光降解有促进作用,促进能力Fe(III)>Mn(II)>Cu(II)。Fe(III)的影响较明显,Cu(II)、Mn(II)的影响较小,主要是由于在微酸性条件下,Fe(III)能在光照射下光解产生羟基自由基,主要以Fe(OH)2+型体存在,其羟基型体促进了Fe(III)向Fe(II)的转化。

This study was aim to explore the influence of different light source,pH value,various initial concentra-tion of sulfamethoxazole （SMX）,and different metal ions such as Fe （III）,Mn （II）and Cu （II）on the photo-degradation of SMX.The results showed that the photodegradation effect of the SMX at low concentrations with 1. 5 AM filter conditions of illumination and acidic conditions was better.The metal ions had different promoting effects on thephotodegradation.The influence of Fe （III）was obvious,while the influence of Cu （II）and Mn （II）on the photodegradation was smaller because Fe （III）could generate hydroxyl radicals photolysis under the conditions of light irradiation and acidic,and existed as Fe （OH）2＋type.Its hydroxyl body promoted Fe （III）converted to the Fe （II）to improve the efficiency of the degradation of organic pollutants.