高岭土对含有Cu^(2+)和Pb^(2+)污水吸附性实验

Experimental on the Adsorption of Kaolin to Wastewater Containing Cu2+ and Pb2+

这是一篇环境工程领域的论文。为了研究高岭土对含有Cu^(2+)和Pb^(2+)污水吸附性能的影响,开展了不同初始浓度、温度、吸附时间、高岭土掺量和pH值作用下高岭土吸附重金属离子实验,并分析了高岭土对Cu^(2+)和Pb^(2+)共同吸附实验结果。结果表明:高岭土吸附金属Pb^(2+)离子的效果要好于高岭土吸附金属Cu^(2+)离子的效果。结合实验结果和经济效益而言,在初始浓度为200 mg/L,pH值为6、温度为30℃,高岭土掺量为1.5 g,吸附时间为2.0 h时,高岭土对金属Pb^(2+)和Cu^(2+)离子的吸附效果较优,其中金属Pb^(2+)离子的吸附量分别达到了56.38、56.22、58.76、35.75、和42.42 mg/g,金属Cu^(2+)离子的吸附量45.99、47.45、47.27、25.26、22.52 mg/g。整体上,高岭土对共同吸附金属离子(Cu^(2+)、Pb^(2+))的吸附量要小于单一离子的吸附量,这是由于两个金属离子在吸附过程中会相互影响对方的吸附过程。Langmuir模型对实验曲线的拟合度要远远高于Freundlich模型对实验曲线的拟合度,这就说明了Langmuir等温吸附模型更加适用于高岭土吸附金属离子吸附量的变化规律,进而证明了高岭土吸附重金属离子属于表面吸附,被吸附的重金属离子都是相互独立存在的。

This is an article in the field of environmental engineering.In order to study the effect of kaolin on the adsorption performance of wastewater containing Cu^(2+)and Pb^(2+),experiments on the adsorption of heavy metal ions by kaolin under different initial concentrations,temperatures,adsorption time,kaolin content and pH values are carried out.And analyzed the results of Cu^(2+)and Pb^(2+)co-adsorption test by kaolin.The results show that the adsorption effect of kaolin on metal Pb^(2+)ions is better than the adsorption effect of kaolin on metal Cu^(2+)ions.Combining the test results and economic benefits,when the initial concentration is 200 mg/L,the pH is 6,the temperature is 30°C,the kaolin content is 1.5 g,and the adsorption time is 2.0 h,Kaolin has the best adsorption effect on metal Pb^(2+)and Cu^(2+)ions.The adsorption capacity of metal Pb^(2+)ions reached 56.38,56.22,58.76,35.75,and 42.42 mg/g,respectively.The adsorption capacity of metallic Cu^(2+)ions is 45.99,47.45,47.27,25.26,22.52 mg/g.On the whole,the adsorption capacity of kaolin for co-adsorbed metal ions(Cu^(2+),Pb^(2+))is smaller than that of a single ion.This is because two metal ions will affect each other's adsorption process during the adsorption process.The fit of Langmuir model to the test curve is much higher than the fit of Freundlich model to the test curve.This shows that the Langmuir isotherm adsorption model is more suitable for the change law of the amount of metal ions adsorbed by kaolin.Furthermore,it is proved that the adsorption of heavy metal ions by kaolin belongs to surface adsorption,and the adsorbed heavy metal ions exist independently of each other.