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.
作者
赵坤铭
王娜
张慧迪
高瑞霜
陈静
王颖
申婷婷
孙静
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)
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)。
关键词
偶氮染料废水
零价铁
脱色
磁场
azo dye wastewater
zero-valent iron
decolorization
magnetic field
