二价铁活化过硫酸盐降解土壤中十溴联苯醚

研究了Fe2+活化过硫酸钠产生的硫酸根自由基降解土壤中十溴联苯醚（PBDE-209）的效果，分别考察了Na2S2O8的用量、初始pH值、Na2S2O8与Fe2+摩尔比例、反应时间4个因素对降解效果的影响。通过正交实验确定了降解污染物的最优条件。结果表明，在Na2S2O8用量为0.8 mmol·kg-1，初始pH为5，Na2S2O8与Fe2+摩尔比为2：1，反应时间为30 min的最优条件下，降解率达96.36%。分子探针竞争实验表明体系中产生了硫酸根自由基。Fe2+活化过硫酸钠降解PBDE-209反应过程符合一级反应动力学。

Degradation of decabromodiphenyl ether in soil by sulfate activated with ferrous ions

The degradation of decabromodiphenyl ether (PBDE-209) in soil using sulfate radical generated by Fe2+-activated sodium persulfate was studied. The effects of persulfate dosage, initial pH value, molar ratio of persulfate to Fe2+, and reaction time on the degradation process were investigated by single-factor experiments and orthogonal experiments. The optimal operating conditions determined by the orthogonal experiments were as follows:persulfate dosage of 0.8 mmol·kg-1 soil, molar ratio of persulfate to Fe2+ of 2:1, initial pH of 5, and reaction time of 30 min. The degradation efficiency reached 96.36% under the optimal operating conditions. The molecular probes methods indicated that sulfate radicals were produced in the system. The degradation of PBDE-209 by Fe2+-activated persulfate follows a first-order kinetic equation.