紫外活化过硫酸盐对甲基橙脱色处理实验研究  

EXPERIMENTAL STUDY ON UV-ACTIVATED PERSULFATE FOR DECOLORIZATION OF METHYL ORANGE WASTEWATER

作　　者：徐朋飞[1] 郭怡秦 王光辉[1,2] 王学刚[1,2] 李鹏[1,2] 

机构地区：[1]东华理工大学水资源与环境工程学院,南昌330013 [2]东华理工大学省部共建核资源与环境国家重点实验室培育基地,南昌330013

出　　处：《环境工程》2017年第11期58-61,89,共5页Environmental Engineering

基　　金：国家自然科学基金(51564001;41761069);江西省青年基金(20161BAB213091)

摘　　要：采用紫外活化光催化剂过硫酸盐对废水中的甲基橙进行脱色处理,研究反应pH、温度、过硫酸盐投加量、初始甲基橙浓度及投加锐钛矿TiO_2、共存阴离子(HCO_3^-、Cl^-)对甲基橙脱色速率的影响。结果表明:甲基橙氧化去除过程符合准一级动力学,反应最佳pH为9.0。在pH=9.0、过硫酸盐投加量0.5 mmol/L、甲基橙初始浓度100 mg/L、反应温度25℃时,经90 min光催化反应,甲基橙脱色效率可达87.6%,反应速率常数k为0.096 min^(-1)。甲基橙的去除速率随温度升高而增大,随甲基橙初始浓度的增加而减小;投加适量的TiO_2(<200 mg/L)可提高甲基橙的去除速率,而TiO_2投加量过多(>200 mg/L)将抑制甲基橙氧化分解。废水中共存HCO_3^-离子时,甲基橙的去除速率下降,而Cl^-(0~200 mg/L)对甲基橙的去除速率无影响。In this study,the decolorization of methyl orange（MO） by UV-activated persulfate process in aqueous solutions was investigated. The effects of reaction pH,temperature,persulfate dosage,initial MO concentration,the addition of anatase TiO2 and anions of HCO3^-,Cl^-on MO decolorization rate were discussed in detail. The experimental date showed that the optimum pH for MO decolorization by using UV-activated persulfate oxidation process was 9. 0. At the experimental condition of pH 9. 0,the persulfate dosage of 0. 5 mmol/L,initial MO concentration of 100 mg/L and the reaction temperature of 25 ℃,after UV light-catalyzed reaction in 90 min,the MO decolorization ratio was 87. 6%,and the reaction rate constant k was 0. 096 min^-1. The decolorization rate of MO increased with the reaction temperature and decreased with the initial MO concentration. The addition of TiO2 with the concentration of 0 ～ 200 mg/L was facilitate to MO decolorization and once the TiO2 concentration was greater than 200 mg/L,the opposite trend would be arise. The anions of HCO3^- in the wastewater inhibited the degradation of MO,while Cl^-with the concentration ranged from 0 to 200 mg/L didn＇t affect MO decolorization.

关 键 词：甲基橙 紫外光 过硫酸盐 硫酸自由基 影响因素 

分 类 号：X788[环境科学与工程—环境工程]