废弃茶叶渣对废水中铅（Ⅱ）和镉（Ⅱ）的吸附研究

采用单因素实验方法，考察了铅和镉离子的初始浓度、吸附时间及pH对吸附的影响，并绘制了三种因素对吸附率及吸附量的影响曲线。结果表明，茶叶渣对Pb2+和Cd2+的吸附率、吸附量随着时间的延长均增高，最后分别达到72.13%、3.56mg/g和93.75%、4.69mg/g；随着Pb2+和Cd2+初始浓度的增加，吸附量均呈上升趋势，最后分别达到4.06mg/g、4.71mg/g，Pb2+的吸附率呈下降趋势，而Cd2+的吸附率呈上升趋势；随着pH的升高，两种离子吸附曲线都为先升后降，各自的最佳pH分别为5、7。通过改变Pb2+和Cd2+的离子初始浓度、吸附时间和调节溶液pH值，废弃茶叶渣对能够对废水中Pb2+和Cd2+有良好的去除效果。

Study on Adsorption of Lead(Ⅱ)and Cadmium(Ⅱ)from Waste Water with Waste Tea

The influence of adsorption time,pH,and ion original concentration of lead and cadmium on thei ons adsorption with tea waste by single-factor experimental method was studied in this paper,and drew thec urve of three influencing factors on adsorption rate and adsorption quantity.The result showed that thea bsorption rate and absorption quantity with tea waste on the absorption of Pb 2＋ and Cd 2＋ are increased with ther aising of adsorption time,which get 72.13%and 3.56 mg/g,93.75%and 4.71 mg/g at last,respectively.Thea dsorption quantity both increased with the raising of concentration of Pb 2＋ and Cd 2＋,which get 4.06 mg/g and4.71 mg/g,the adsorption rate of Pb 2＋ reduced but the adsorption rate of Cd 2＋ increased.The curve of absorptiono f Pb 2＋ and Cd 2＋ first and then decreased with the raising of pH,and the optimum are 5 and 7.The waste tea hasg ood removal efficiency in Pb 2＋ and Cd 2＋ in waste water by changing the Pb 2＋ and Cd 2＋ ion of the initialc oncentration,adsorption time and adjusts the solution pH.