Rapid decolorization of Acid Orange Ⅱ aqueous solution by amorphous zero-valent ironRapid decolorization of Acid Orange Ⅱ aqueous solution by amorphous zero-valent ironRapid decolorization of Acid Orange Ⅱ aqueous solution by amorphous zero-valent iron

• Published in: 环境科学学报：英文版 2012, Vol.24 (6), p.1021-1026
• Main Author: Changqin Zhang Zhengwang Zhu Haifeng Zhang Zhuangqi Hu
• Format: Article
• Language: English
• Subjects: 初始pH值; 反应温度; 水溶液; 熔融纺丝技术; 脱色效果; 酸性橙; 零价铁; 非晶
• ISSN: 1001-0742; 1878-7320

Some problems including low treatment capacity,agglomeration and clogging phenomena,and short working life,limit the application of pre-treatment methods involving zero-valent iron （ZVI）.In this article,ZVI was frozen in an amorphous state through a melt-spinning technique,and the decolorization effect of amorphous ZVI on Acid Orange II solution was investigated under varied conditions of experimental variables such as reaction temperature,ribbon dosage,and initial pH.Batch experiments suggested that the decolorization rate was enhanced with the increase of reaction temperature and ribbon dosage,but decreased with increasing initial solution pH.Kinetic analyses indicated that the decolorization process followed a first order exponential kinetic model,and the surface-normalized decolorization rate could reach 2.09 L/（m^2 ·min） at room temperature,which was about ten times larger than any previously reported under similar conditions.Recycling experiments also proved that the ribbons could be reused at least four times without obvious decay of decolorization rate and efficiency.This study suggests a tremendous application potential for amorphous ZVI in remediation of groundwater or wastewater contaminated with azo dyes.