摘要
在紫外光照射下,研究了以镍钴双金属氧化物(CoNiO_x)为催化剂,过硫酸氢钾(PMS)为氧化剂的光催化氧化体系对酸性橙7(AO7)的降解效果和机理。结果表明:UV/CoNiO_x/PMS体系降解AO7较相同条件下的CoNiO_x/PMS、UV/PMS以及单金属催化体系效果更好;通过单因素实验法,确定了AO7降解的最佳反应条件,即AO7初始浓度为32μmol/L,PMS投加量为120μmol/L,催化剂投加量为50 mg/L,溶液初始pH约为10;溶液中的离子(HCO_3^-、Cl^-、Mg^(2+)和Ca^(2+))都会对UV/CoNiO_x/PMS工艺降解AO7产生抑制作用,且抑制作用顺序为HCO_3^->Cl^->Mg^(2+)>Ca^(2+);氧气是控制光催化反应速率的因素之一;通过投加乙醇和叔丁醇两种猝灭剂,证明了·SO_4^-在AO7的降解反应中起主导作用。反应20 min,该体系对AO7的去除率可达97.5%。
Under ultraviolet irradiation,the photocatalytic oxidation system using bimetallic Co-Ni oxide（CoNiO_x ） as the catalyst and peroxymonosulfate（PMS） as the oxidant,was applied to the degradation of acid orange 7（AO7）.The results showed that UV/CoNiO_x /PMS system had higher activity than CoNiO_x /PMS,UV/PMS,Co Oxand Ni Oxsystem.Through single-factor experiments,the optimum reaction condition of AO7 degradation was determined,under which initial AO7 concentration was 32 μmol/L,PMS dosage was 120 μmol/L,initial CoNiO_x dosage was 50 mg/L,and initial p H was about 10.Bicarbonate,chloride,magnesium ion and calcium ion inhibited the degradation of AO7 in UV/CoNiO_x /PMS process,and the inhibition extent was in the sequence of HCO_3^- Cl^- Mg^（2＋） Ca^（2＋）.Oxygen was one of the factors that influenced phtotcatalytic reaction rate.By adding different radical scavengers,ethylalcohol（EA） and tertbutylalcohol（TBA）,it was proved that sulfate radical（·SO_4^-） made the predominant contribution in removal of AO7.When reaction time was 20 min,the degradation rate of AO7 by the UV/CoNiO_x /PMS system could reach 97.5%.
出处
《环境工程》
CAS
CSCD
北大核心
2018年第1期47-52,共6页
Environmental Engineering
基金
国家自然科学基金项目(51508353)
成都市科技惠民项目(2015-HM01-00279-SF)
大学生创新创业训练计划(201610611024)
