热活化过硫酸钠降解土壤体系中的菲  

DEGRADATION OF PHENANTHRENE IN SOIL VIA THERMALLY ACTIVATED SODIUM PERSULFATE

作　　者：徐开泰 林匡飞[1] 陆强[1] 姚振楠 张金妹 

机构地区：[1]华东理工大学资源与环境工程学院国家环境保护化工过程环境风险评价与控制重点实验室,上海200237

出　　处：《环境工程》2018年第1期188-194,共7页Environmental Engineering

基　　金：国家科学自然基金(41371467)

摘　　要：菲(PHE)是一种重要的土壤有机污染物。通过研究在不同水浴温度下,PHE在土壤中的吸附特性及降解过程,揭示了热活化过硫酸钠(Na_2S_2O_8)降解土壤体系中PHE的一般机制。实验结果表明:热活化Na_2S_2O_8降解土壤中的PHE是一个氧化与吸附同时进行的过程;吸附在土壤孔隙结构中的PHE很难被氧化;反应前10 min,氧化和吸附过程均符合准一级动力学方程;温度对PHE降解速率的影响符合阿伦尼乌斯模型,在333~363 K,活化能为122.6 k J/mol;表观反应速率常数随Na_2S_2O_8投量增加而增大;PHE的降解率随着PHE初始浓度升高而降低,随着水土比升高而升高;在Na_2S_2O_8浓度较高的条件下,H^+、HCO_3^-和Cl^-对PHE降解率影响不大,OH^-会降低PHE的降解率。Phenanthrene（PHE） is an important organic pollutant in soil.Through the research of adsorption characteristics and degradation process of PHE in soil at different water bath temperature,this paper revealed the general mechanism of degradation of PHE via thermally activated sodium persulfate in soil system.Experimental results showed that the degradation of PHE was a process of oxidation and adsorption; PHE adsorbed in soil pore structure was difficult to be oxidized; the process of oxidation and adsorption accorded with pseudo-first order kinetic equation; the effect of temperature on reaction rate accorded with Arrhenius model,the activation energy was 122.6 kJ/mol at 333 ~ 363 K; the apparent reaction rate constant increased with increase of the dosage of sodium persulfate; the degradation rate of PHE decreased with the increase of initial concentration of PHE,increased with the increase of the water-soil ratio; in the condition of high concentration of sodium persulfate,H~＋、HCO_3^- and Cl^- had little effect on the degradation rate of PHE,OH^- could reduce the degradation rate of PHE.

关 键 词：菲 土壤 过硫酸钠 热活化 降解机制 

分 类 号：X53[环境科学与工程—环境工程]