【作者】 敖晓奎； 罗琳； 关欣； 李慧； 陈歆妍；

【Author】 AO Xiao-kui 1 , LUO Lin 2 , GUAN Xin 2 , LI Hui 2 , CHEN Xin-yan 2 (1.Colleye of Bio-technology, Hunan Agricaltral University, Changsha 410128, China; 2.College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China)

【机构】 湖南农业大学生物科学技术学院； 湖南农业大学资源环境学院；

【摘要】 镉离子是水体中污染严重的重金属离子之一。研究了茶叶渣在不同浓度、茶渣量、时间、pH、温度条件下对镉离子的吸附特性,作出了吸附速率曲线和吸附等温线,并求出了Freundlich方程中的吸附参数。实验结果表明,废弃茶叶渣对镉离子具有良好的吸附效果,并呈现出吸附速率快的特点,40min即可达到吸附平衡;溶液的pH对吸附有显著影响,最佳吸附pH在7.8左右。吸附规律符合Freundlich等温式,且吸附量随着温度的升高而增大,表明吸附是吸热过程。更多还原

【Abstract】 Cadmium ion is one of the seriously pollutants in wastewater. Adsorption characteristics to cadmium ion by tea dregs at different concentrations, amounts, times, pH and temperatures conditions in aqueous solution were studied. Curves of adsorption rate and adsorption isotherm were drawn, and adsorption parameters in Freundlish formulas were calculated. The results indicated that tea dregs had fine adsorption effects on cadmium ion, and the absorptivity increased as increases of amounts of tea dregs at the same concentration and rises of initial concentrations when adding the same amounts of tea dregs. It was quick for adsorption, and that brought into adsorption equilibrium in 40 min. The pH of aqueous solution was an important influence factor to adsorption, and the best pH to adsorption was about 7.8. Adsorption laws of Cd 2+ by tea dregs obeyed the Freundlish equation. It showed the reaction process accompanied by the absorption of heat for the adsorption amount increased with the rise of temperature.更多还原