骨炭去除水中砷(Ⅴ)的试验研究.pdf

第 39 卷第 2 期 中南大学学报自然科学版( ) Vol.39 No.2 2008 年 4 月 J. Cent. South Univ. (Science and Technology) Apr. 2008 骨炭去除水中砷( Ⅴ) 的试验研究 陈云嫩，柴立元，舒余德 ( 中南大学 冶金科学与工程学院，湖南 长沙，410083) 摘 要：采用骨炭作吸附剂，通过静态和动态吸附试验，研究饮用水中砷( Ⅴ)去除的效果及其影响因素，以及骨 炭反复吸附—解吸—再生—再吸附后骨炭性能的稳定性。研究结果表明：在pH=10 ，吸附时间为30 min和骨炭加 入量为0.6 g/L，饮用水砷初始质量浓度为0.5 mg/L时其砷去除率可达95.2%；骨炭吸附砷的行为同时符合Langmuir 和Freundlich等温吸附模型；其吸附机理可能是Ca—OH官能团结合HAsO2− 阴离子，并产生砷酸氢钙和羟基磷灰 4 石的共沉淀，另外还存在离子交换作用；吸附柱的饱和吸附容量为4.688 mg/g ；出水砷浓度符合世界卫生组织(WHO) 规定饮水砷标准(0.01 mg/L) 。 关键词：砷；吸附；骨炭；饮用水；离子交换 中图分类号：X703 文献标识码：A 文章编号：1672-7207(2008)02−0279−05 Arsenic(V) removal from drinking water by bone char CHEN Yun-nen, CHAI Li-yuan, SHU Yu-de (School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China) Abstract: The affecting factors of removal of arsenate (As( Ⅴ)) by bone char were studied in batch and column experiments. The results show that the performance of bone char adsorbing As( Ⅴ) from drinking water is stable after adsorption—desorption—regeneration—re-adsorption cycles. When pH is 10, adsorption time is 30 min, dosage of bone char is 0.6 g/L, the original concentration of As( Ⅴ) in drinking water is 0.5 mg/L, As( Ⅴ) removal can reach 95.2%. The adsorption behavior is fitted both with Langmuir and Freundlich isotherm. The adsorption mechanism is supposed to be Ca—OH functional groups combined with HAsO2− anion. And there may occur the co-precipitation between calcium