期刊论文

Xie, S.

中文

环境工程学报

1673-9108

2015

9

3

1141-1147

11175081:国家自然科学基金 20134324110003:高等学校博士学科点专项科研基金 13JJ3078:湖南省自然科学基金 13K085:湖南省高等学校创新平台项目

本校为第一且通讯机构

以生活污水处理厂剩余活性污泥为原料,制备粉末活性污泥(PAS)作为生物吸附剂,考察pH值,PAS投加量,U(Ⅵ)初始浓度和吸附时间对PAS吸附U(Ⅵ)的影响,探讨了PAS吸附U(Ⅵ)的作用机理。实验结果表明,在U(Ⅵ)初始浓度为10 mg/L时,其最佳吸附pH值为3,去除率97.77%,吸附平衡时间120 min;吸附过程较好地拟合了准二级动力学模型(R~2≈1)和Freundlich等温模型(R~2≈1);X射线能谱和离子交换实验分析表明,离子交换为其主要吸附方式,参与交换的主要离子为Ca~(2+);红外光谱分析表明,PAS吸附U(Ⅵ)后自身结构未发生改变。以0.1 mol/L的HCl溶液作为解吸液,初次解吸率达92.83%,循环利用3次仍具有较好的吸附效果。

The residual activated sludge from an urban sewage treatment plant was used to prepare powdered activated sludge (PAS) as a novel biological adsorbent. Different experimental parameters such as solution pH, adsorbent dose, initial concentration and contact time were examined to investigate their effects on adsorption of uranium by PAS. Changes of FT-IR spectra, scanning electron microscope and energy-dispersive spectrometry of PAS before and after adsorption were also studied. The results showed that the maximum adsorption occured at pH of 3, t...