催化臭氧氧化降解水溶液中亚甲基蓝的动力学研究  

Kinetic Study of Catalytic Ozonation of Methylene Blue in Water

作　　者：冯利 蔡俊雄 崔龙哲[3] 康瑾 

机构地区：[1]湖北省环境监测中心站,湖北武汉430072 [2]湖北省环境科学研究院,湖北武汉430072 [3]中南民族大学环境工程与科学研究所,湖北武汉430074

出　　处：《环境科学与技术》2014年第8期146-150,共5页Environmental Science & Technology

基　　金：2008年度湖北省研究与开发类项目(2008BCD202)

摘　　要：以废啤酒酵母为原材料、采用吸附-活化法制备得到负载过渡金属铁的活性炭(Fe/AC),对Fe/AC吸附亚甲基蓝(MB)性能和催化臭氧氧化MB效果进行了评价。Fe/AC对MB的吸附符合Langmuir等温吸附模型;20℃,pH=7的条件下,Fe/AC对MB的最大吸附量达到107.43 mg/g。吸附MB达到平衡的Fe/AC催化臭氧氧化降解水中MB,30 min内MB的转化率达到99%以上,5 h后总有机碳(TOC)的降解率达到70%。结合Fe/AC吸附MB特性和催化臭氧氧化MB行为,将Langmuir等温吸附模型分别与近似一级和二级反应动力学模型进行耦合,构建了Langmuir-Kinetic近似一级和近似二级耦合模型,均能较好地拟合MB转化率的动力学数据,但对体系的TOC去除率动力学数据的拟合度较低。Iron-supported activated carbon （Fe/AC） was prepared using brewing yeast as precursor by adsorption-activation method. The adsorption of methylene blue （MB） on Fe/AC and catalytic ozonation of MB by Fe/AC were investigated. Langmuir isotherm well described the MB adsorption on Fe/AC. The maximum MB uptake was estimated to be 107.43 mg/g at 20 ℃ and pH 7. MB conversion rate by Fe/AC catalytic ozonation reached 99% within 30 rain, and total organic carbon （TOC） removal efficiency reached 70% within 5 h. Langmuir equation was combined with pseudo-first（second）-order kinetics to construct pseudo-first（second）-order Langmuir-kinetic model, which was proved to well describe the conversion process of MB, but fail to fit the TOC removal process.

关 键 词：催化臭氧氧化 反应动力学 亚甲基蓝 

分 类 号：X703[环境科学与工程—环境工程]