零价铁降解偶氮染料废水的特性研究  

Investigation on the Degradation Characteristics of Direct Blue 15 by Zero-valent Iron

作　　者：赵坤铭 王娜 张慧迪 高瑞霜 陈静[1] 王颖[1] 申婷婷[1] 孙静[1] ZHAO Kum-ming;WANG Na;ZHANG Hui-di;GAO Rui-shuang;CHEN Jing;WANG Ying;SHEN Ting-ting;SUN Jing(College of Environmental Science and Engineering,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250353,China)

机构地区：[1]齐鲁工业大学(山东省科学院)环境科学与工程学院,济南250353

出　　处：《齐鲁工业大学学报》2020年第3期29-35,共7页Journal of Qilu University of Technology

基　　金：国家自然科学基金青年基金(21507067);山东省高等学校科技计划项目(2418140107);国家级大学生创新创业训练计划项目(201810431036);齐鲁工业大学(山东省科学院)2018年度青年博士合作基金项目(2018BSHZ0021);齐鲁工业大学校级大学生创新创业训练计划项目(04120482)。

摘　　要：利用零价铁体系对双偶氮染料废水(直接蓝15:DB15)进行降解研究。当废水初始浓度为100 mg/L,最佳反应时间为50 min,铁粉最佳投加量为9.0 g/L,铁粉粒径为200目,最佳反应pH为3.0时,DB15的脱色率可达到98.69%;通过测定反应体系中自由基以及铁粉磁化前后的扫描电镜(SEM)谱图、DB15降解前后的UV-vis谱图对零价铁体系的降解特性进行了分析,研究结果表明:该反应体系是一个Fe0、Fe2+及Fe3+共存体系,其优势自由基是·OH,首先攻击的是DB15结构中的显色基团偶氮键(-N=N-),然后脱色直至降解为小分子物质,而且磁场可有效促进零价铁表面的腐蚀,提升体系的降解效能。The degradation of direct blue 15(DB15)was investigated by zero-valent iron.The degradation rate of direct blue 15 can reach 98.69%under the optimal experimental conditions of the initial concentration of DB15100 mg/L,the reaction time 50 min,the dosage of iron powder 9.0 g/L,the particle size of iron powder 200 mesh,and the reaction pH 3.0.According to the UV-Vis spectrum of DB15 in the degradation process,the azo bond(-N=N-)in the dye structure was firstly attacked and decolorized by zero-valent iron and then degraded into small molecules.Moreover,the characteristics of the zero-valent iron involved in the degradation system was investigated by radicals detection and scanning electron microscopy(SEM).The results showed that degradation system was a comprehensive process of Fe0、Fe2+and Fe3+and hydroxyl radical(·OH)dominated in the system.The SEM of zero-valent iron further indicated that the magnetic field could accelerate the corrosion of zero-valent iron and promote the degradation efficientcy of DB15.

关 键 词：偶氮染料废水 零价铁 脱色 磁场 

分 类 号：X131.2[环境科学与工程—环境科学]