摘要
邻苯二甲酸二乙酯(diethyl phthalate,DEP)作为典型增塑剂,使用量巨大.DEP是一种环境激素,在环境中广泛检出,会影响生物体的生殖功能.本文研究了Fenton法降解环境浓度水平的典型增塑剂的动力学特征及其影响因素,研究表明,H_(2)O_(2)浓度、Fe^(2+)浓度、pH值及DEP的初始浓度都会对DEP的动力学和降解特征产生不同程度的影响.在pH 3.0,DEP为50μmol·L^(-1),亚铁浓度为100μmol·L^(-1),过氧化氢浓度为500μmol·L^(-1)时,反应30 min后,DEP去除率为71%.增加Fe^(2+)与H_(2)O_(2)浓度有利于DEP的去除;水中常见物质Cl-、NO-3、HCO-3与HA共存时,DEP的去除效率受到抑制;反应前9 min,一阶反应速率常数k1值与体系中DEP的初始浓度之间呈负线性相关关系.相对于一阶和二阶动力学,BMG动力学模型是描述Fenton法对低浓度DEP去除过程的最佳模型.DEP浓度、pH、[H_(2)O_(2)]/[Fe^(2+)]摩尔比值与BMG模型中的1/m和1/b存在良好的相关关系(R^(2)>0.9).
As a typical plasticizer,diethyl phthalate(DEP)is used in a huge amount.DEP is an environmental hormone widely detected in the environment and affects the reproductive function of organisms.Fenton is a commonly used advanced oxidation technology for the removal of refractory organics.In this paper,the kinetic characteristics and influencing factors of typical plasticizer degradation in environmental concentration level by Fenton method were studied.The results showed that concentration of H_(2)O_(2),concentration of Fe^(2+),pH value and initial concentration of DEP had different effects on the dynamics and degradation characteristics of DEP.When the pH was 3.0,the concentration of DEP was 50μmol·L-1,the concentration of Fe^(2+)was 100μmol·L-1,and concentration of H_(2)O_(2)was 500μmol·L-1,the removal efficiency of DEP reached 71%after 30 min.Increasing the concentrations of Fe^(2+)and H_(2)O_(2)was beneficial to improve the removal efficiencies of DEP.When the common substances in water coexisted,such as Cl-,NO-3,HCO-3 and HA,the removal efficiencies of DEP were inhibited;There was a negative linear correlation between the first-order reaction rate constant k1 value and the initial concentrations of DEP at the first 9 min.Compared to first-order and second-order kinetics,the BMG kinetic model was the best model to describe the removal of low-concentration DEP by Fenton method.
作者
章琴琴
丁世敏
封享华
余友清
王捷
陈凤贵
黄海燕
ZHANG Qinqin;DING Shimin;FENG Xianghua;YU Youqing;WANG Jie;CHEN Fenggui;HUANG Haiyan(Green Intelligent Environmental School,Yangtze Normal University,Chongqing,408100,China)
出处
《环境化学》
CAS
CSCD
北大核心
2020年第11期3009-3016,共8页
Environmental Chemistry
基金
重庆市自然科学基金(cstc2019jcyj-msxm X0672)
重庆市教委科学技术研究项目(KJ1712311,KJ1601209)
国家留学基金委(201808505139)
重庆市涪陵区科技计划项目(FLKJ2018BBB3020)
长江师范学院科研项目资助
