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巯基棉对废水中镉的吸附

作者:时间:2015-12-16点击数:

PDF全文下载:2015060601

任春艳, 李雪清, 师进生

(青岛农业大学化学与药学院,山东 青岛 266109)

摘要: 通过硫代乙醇酸对巯基棉进行改性后对废水中的镉离子进行了吸附研究。结果表明:50 mL 25 mg·L-1的镉标准溶液中,在pH=7以及巯基棉用量为02 g时能达到良好的吸附效果(吸附率超过90%)。巯基棉对镉离子的吸附可用伪二级动力学方程拟合,吸附在100 min左右达到平衡。吸附等温线可用Langmuir等温式拟合,温度升高饱和吸附量减小,因此低温有利于该吸附反应的进行。

 关键词: 巯基棉; 镉;  吸附; 废水处理

中图分类号: TQ 330.1                        文献标志码: A

 Cadmium Adsorption of Sulfhydryl Cotton in Wastewater

REN Chunyan, LI Xueqing, SHI Jinsheng

(College of Chemistry and Pharmacentical Sciences, Qingdao Agricultural University, Qingdao 266109, China)

Abstract: The adsorption kinetics and thermodynamics of cadmium (Ⅱ) onto the sulfhydryl cotton were investigated in this paper. The best conditions were confirmed that pH was 7 and sulfhydryl cotton was 02 gin 50 mL 25 mg·L-1cadmium solution(adsorption rate over 90%). The sorption kinetics process of cadmium could be well described by pseudosecondorder kinetic rate equation. The sorption equilibrium could be established within 100 min. The sorption isotherms could be well described by the Langmuir isotherm. Estimation of the thermodynamic parameters indicated that the sorption was found to be favored by a lower temperature.

 Key words: sulfhydryl cotton; cadmium; adsorption; wastewater treatment

收稿日期: 20150525

基金项目: 青岛农业大学高层次人才启动基金项目(1111302).

作者简介: 任春艳(1975—),女,副教授.

文章编号: 16726987(2015)06060104; DOI: 10.16351/j.16726987.2015.06.002

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