Fe2+活化过硫酸钠降解1,2-二氯苯

以Na2S2O8为氧化剂,柠檬酸螯合Fe2+为活化剂,对水中1,2-二氯苯进行处理。首先研究了Na2S2O8浓度、FeSO4浓度、柠檬酸浓度及初始pH值等因素对1,2-二氯苯降解的影响;然后通过正交实验,发现在Na2S2O8浓度14.28 mmol/L、FeSO4浓度7.14 mmol/L、柠檬酸浓度3.57 mmol/L、初始pH值3.0的条件,1,2-二氯苯降解率达到最大(99.28%)。进一步研究表明,柠檬酸螯合FeSO4活化Na2S2O8降解1,2-二氯苯的过程可分为2个阶段,其中第1阶段为快速反应,第2阶段反应速度较慢并且符合一级反应动力学规律。

Sodium persulfate activation by Fe2+ for degradation of 1,2-dichlorobenzene

To investigate the degradation of 1,2-dichlorobenzene in water, the oxidant of sodium persulfate and activating agent of citric acid chelated with Fe²⁺ were used. The effects of the concentrations of sodium persulfate, FeSO₄, citric acid and initial value of pH on the degradation of 1,2-dichlorobenzene were studied. The optimal operating conditions were obtained by orthogonal experiments as follows: 14.28 mmol/L of Na₂S₂O₈, 7.14 mmol/L of FeSO₄, 3.57 mmol/L of citric acid and the initial pH value of 3. Under these conditions, the 0.34 mmol/L 1,2-dichlorobenzene degradation rate was 99.28% after 4 hours. The further studies showed that the reaction included an initial fast stage and a final slow stage. The reaction was very fast at the first stage, and became slow at the second stage which followed a first-order kinetic.