摘要
采用臭氧氧化技术处理2,4,6-三氯酚(2,4,6-TCP),研究其反应动力学,同时研究2,4,6-TCP的初始质量浓度、臭氧发生量、pH、水中常见阴离子对降解速率的影响。研究结果表明:臭氧氧化能有效降解2,4,6-TCP,且降解规律符合准一级动力学模型;2,4,6-TCP初始质量浓度由3 mg/L增加到10 mg/L,降解速率k由0.134 1 min-1降低到0.058 1 min-1;固定初始质量浓度5 mg/L,当臭氧发生量由0.68 mg/min增加到2.34 mg/min时,降解速率常数由0.087 7 min-1提高到0.328 4 min-1;当pH由2.96逐步增加至11.00时,2,4,6-TCP的降解速率常数由0.050 3 min-1提高到0.168 1 min-1,且对于相同的pH增幅对降解反应速率的影响,酸性条件较碱性条件更大;SO42-对降解速率的影响不明显,HCO3-,CO32-,NO3-和Cl-均有利于2,4,6-TCP的降解,反应速率常数由大至小依次为:HCO3-,CO32-,NO3-,Cl-和SO42-。
Ozone was used to degrade 2,4,6-TCP and its kinetics was studied. The effects of initial mass concentration of 2,4,6-TCP, ozone dose, pH, common anions in water on degradation rate were discussed. The results show that 2,4,6-TCP can be effectively degraded by ozone and that reactions fits well with the first-order kinetics. When the initial mass concentration of 2,4,6-TCP changes from 3 mg/L to 10 mg/L, the rate constant decreases from 0.134 1 min -1 to 0.058 1 min-1. The rate constant increases from 0.087 7 min-1 to 0.328 4 min-1, as ozone production varies from 0.68 mg/min to 2.34 mg/min. With the change of pH from 2.96 to 11.00, the rate constant increases from 0.050 3 min-1 to 0.168 1 min-1. The rate of increase on degradation of 2,4,6-TCP is bigger under acidic condition than that under alkaline condition. HCO3-, CO32-, NO3- and CI- have different positive effects on the degradation of 2,4,6-TCP while the effects of SO42- are not obvious. The degradation rate, the degradation rate from large to small of the five anions can be arranged as： HCO3-, CO32-, NO3-, CI and SO42-.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第5期2130-2135,共6页
Journal of Central South University:Science and Technology
基金
国家科技重大专项项目(2012ZX07403-001)
住房和城乡建设部研究项目(2009-K7-4)
