摘要
采用介质阻挡放电(DBD)等离子协同颗粒活性炭负载TiO2(TiO2-GAC)对甲基橙进行降解,研究了该体系的协同处理效果,探讨了放电电压、初始pH、初始电导率、初始浓度和TiO2-GAC投加量等操作参数的影响,并建立了协同体系的表观反应动力学模型.实验结果表明,DBD与TiO2-GAC联合处理表现出明显的协同效应,处理25min后,协同体系对甲基橙的降解率和COD去除率分别为96.2%和90%,与单独DBD体系相比,分别提高了52.7%和50.4%;协同体系降解甲基橙的过程符合表观反应动力学模型,模型值与实验值吻合良好,总级数为2.352;体系中H2O2、O3浓度测定结果表明,与单独DBD体系对比,协同体系的H2O2浓度增高,而O3浓度降低,说明TiO2-GAC起到了催化作用;TiO2-GAC在DBD体系中获得了原位再生,五次再生循环后再生率达80%.
The application of titanium dioxide-loaded granular activated carbon( TiO2-GAC) in a dielectric barrier discharge( DBD) reactor for degradation of methyl orange( MO) was investigated. Several factors,such as peak voltage,p H,solution conductivity,MO concentration and TiO2-GAC content,and the effect of TiO2-GAC in the combined treatment of DBD and TiO2-GAC were considered to explore the applicability,and a reaction kinetics model was established. Experimental results indicated that a synergistic effect appeared in the combined treatment,where degradation efficiency and chemical oxygen demand( COD) removal rate were 96.2% and 90% after a 25 minutes reaction. Compared to DBD,the degradation efficiency and COD removal rate increased 53.7% and 50. 4% in DBD combined with TiO2-GAC. The empirical kinetic equation of MO degradation fit well with the experimental data,with an overall reaction order of 2. 352. The experimental data showed that with the addition of TiO2-GAC,concentration of H2O2 increased while O3 decreased in DBD reactor,which suggested that TiO2-GAC catalyst induced a well catalytic effect in the combined treatment. The regeneration efficiency of TiO2-GAC was about 80% after five times DBD regeneration cycles, which confirmed the reuse feasibility of the regenerated GAC.
出处
《环境科学学报》
CAS
CSCD
北大核心
2015年第6期1800-1808,共9页
Acta Scientiae Circumstantiae
基金
国家自然科学基金项目(No.21367002
51368004)
广西自然科学基金项目(No.2014GXNSFAA118294)
广西研究生教育创新计划资助项目(No.YCSZ2014044)
广西大学"大学生创新创业训练计划"资助项目(No.141059317)~~
