| 介质阻挡放电等离子协同TiO_2-GAC降解甲基橙的研究 |
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| 引用本文： | 陈颖,喻泽斌,王永晓,胡长强,王莉,项国梁,孙蕾,刘智梅,韦金义.介质阻挡放电等离子协同TiO_2-GAC降解甲基橙的研究[J].环境科学学报,2015,35(6):1800-1808. |
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| 作者姓名： | 陈颖 喻泽斌 王永晓 胡长强 王莉 项国梁 孙蕾 刘智梅 韦金义 |
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| 作者单位： | 1. 广西大学环境学院,南宁,530004
2. 广西大学环境学院,南宁530004;广西华蓝设计(集团)有限公司,南宁530011 |
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| 基金项目： | 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) |
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| 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%.
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| 关 键 词： | 介质阻挡放电等离子 TiO2-GAC 协同作用 动力学 活性物质 再生 |
| 收稿时间： | 2014/7/19 0:00:00 |
| 修稿时间： | 2014/8/31 0:00:00 |
Application of titanium dioxide-loaded granular activated carbon in a dielectric barrier discharge reactor for degradation of methyl orange |
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| CHEN Ying,YU Zebin,WANG Yongxiao,HU Changqiang,WANG Li,XIANG Guoliang,SUN Lei,LIU Zhimei and WEI Jinyi.Application of titanium dioxide-loaded granular activated carbon in a dielectric barrier discharge reactor for degradation of methyl orange[J].Acta Scientiae Circumstantiae,2015,35(6):1800-1808. |
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| Authors: | CHEN Ying YU Zebin WANG Yongxiao HU Changqiang WANG Li XIANG Guoliang SUN Lei LIU Zhimei and WEI Jinyi |
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| Institution: | School of the Environment, Guangxi University, Nanning 530004,1. School of the Environment, Guangxi University, Nanning 530004;2. Guangxi Hualan Design and Consulting Group Co. Ltd, Nanning 530011,School of the Environment, Guangxi University, Nanning 530004,School of the Environment, Guangxi University, Nanning 530004,School of the Environment, Guangxi University, Nanning 530004,School of the Environment, Guangxi University, Nanning 530004,School of the Environment, Guangxi University, Nanning 530004,School of the Environment, Guangxi University, Nanning 530004 and School of the Environment, Guangxi University, Nanning 530004 |
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| Abstract: | 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, pH, 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. |
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| Keywords: | dielectric barrier discharge TiO2-GAC synergistic effects kinetics active species regeneration |
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