【摘要】 研究了模拟太阳光作用下冰相中双氧水体系罗丹明B(RhB)光转化规律,考察了光照时间、温度、RhB初始浓度、pH值和双氧水剂量对RhB光解的影响.对照冰相与水相中RhB在双氧水体系中的光解效果,发现冰相中RhB的去除率远远低于水相,说明冰相中晶格的笼子效应限制了RhB与H2O2之间的反应.同时,研究了外加3种无机阴离子(还原性Cl-、氧化性SO42-和S2O82-)对冰相中RhB降解的影响,结果表明,3种离子都能促进冰相中双氧水体系RhB的光解,其中S2O82-能显著提高RhB的去除率.S2O82-和Cl-加入剂量越高,RhB去除率越高,而SO42-加入剂量增加会阻碍RhB的光解.依据研究结果,推测了冰相中RhB在双氧水体系中的光解历程与机理,为深入了解冰相中污染物自由基降解规律提供依据.更多还原

【Abstract】 Phototransformation of RhB in ice phase hydrogen peroxide system under simulated sunlight irradiation was studied.The effects of photolysis time,temperature,RhB concentration,pH value and H2O2 dosage on RhB photolysis were investigated.By comparing RhB photolysis efficiency,we found that RhB removal efficiency in ice phase was lower than that in aqueous solution,indicating that cage effect in ice lattice restricted the collision reaction between RhB and H2O2 molecule.Moreover,effect of three types of inorganic ions(reductive Cl-,oxidative SO2-4 and S2O2-8) on RhB photolysis in ice phase were explored.The experiment results showed that three types of ions can unlimitedly accelerate RhB degradation in ice phase.Among those,S2O2-8 can remarkably enhance RhB removal efficiency.The removal efficiency of RhB in ice phase increased with the increase of dosage of S2O2-8 and Cl-.However,the increase of dosage of SO2-4 would limit RhB photolysis.On the basis of experimental results,we inferred photolysis pathway and mechanism of RhB in H2O2 system in ice phase,which would provide valuable information for pollutant radical degradation in ice phase.更多还原