The adsorption and photocatalytic degradation of sulfamethazine in the soil were investigated. The effects of catalyst TiO2 dosage, water content, irradiation time, and initial concentration were studied respectively. The results showed that only a small quantity of sulfamethazine could be adsorped by the soil and 90% of sulfamethazine was free in the soil. Catalyst TiO2 accelerated the photodegradation of sulfamethazine. The degration rate increased with the increasing of the water content of the soil and irradiation time. The initial concentration of sulfamethazine slightly influenced the photodegradation.%研究了磺胺二甲嘧啶(Sulfamethazine,SM2)在土壤中的等温吸附和光催化降解特征,考察了催化剂TiO2用量、土壤水分含量、光照时间和初始浓度等因素对降解效果的影响.结果表明,土壤表面对SM2吸附较小,90％以上的SM2以游离形式存在于土壤中；催化剂TiO2可明显促进SM2的光降解,增加土壤水分含量和延长光照时间,均能显著提高SM2的光降解率,而SM2的初始浓度对光降解效果影响较小.
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