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环境化学  2015 

锆铁复合氧化物颗粒对As(Ⅴ)的去除研究

Keywords: As(Ⅴ),锆铁复合氧化物,吸附,颗粒吸附剂

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Abstract:

系统研究了锆铁氧化物颗粒吸附剂(GZI)对As(Ⅴ)的去除性能,考察了反应时间、溶液pH、初始As(Ⅴ)浓度、共存离子等反应条件的影响.同时评价了吸附后材料的脱附性能及动态处理后材料的安全性.实验结果显示,初始浓度低于20mg·L-1时,5h后As(Ⅴ)在GZI吸附剂上达到平衡,初始浓度为50mg·L-1时,24h内As(Ⅴ)在GZI吸附剂上未达到平衡.吸附过程符合准二级速率方程,吸附开始3.0h内,吸附主要受颗粒内扩散控制.在pH3.0-9.0的范围内,As(Ⅴ)在GZI表面吸附不受pH影响,显示出良好的pH适用性,意味着在地下水常见的pH范围内,吸附效率不受pH影响.在pH=7.0时,As(Ⅴ)平衡浓度为13.8mg·L-1时,该颗粒吸附剂对As(Ⅴ)的去除容量为20.75mg·g-1,优于多数已报道的颗粒除砷吸附剂.共存离子实验结果显示,HCO3-、F-、腐殖酸对As(Ⅴ)的去除存在不同程度影响,其余共存离子在中性pH条件下对As(Ⅴ)去除影响不大.碱液脱附实验表明,3.0%的NaOH适合于对吸附后的GZI进行脱附.对使用后的吸附剂颗粒进行的TCLP测试证实其是惰性的、可以安全填埋.以上结果显示GZI吸附剂是一种能应用于实际处理的除砷吸附剂.

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