不同金属污染物在含钙高岭土中的运移特性试验研究

Experimental Study on Transport Characteristics of Different Metal Pollutants in Calcium-containing Kaolin

重金属在土壤中的运移过程极其复杂,土壤的性质和结构不同,对运移也会造成影响.通过将不同浓度的Ca^(2+)溶液加入高岭土来模拟真实的含钙土壤,研究高岭土含钙量对Cu^(2+)、Pb^(2+)、Zn^(2+)运移规律的影响,并分析Cu^(2+)、Pb^(2+)、Zn^(2+)在含钙高岭土中的运移规律.得出结论:随着高岭土含钙量的增加,Cu^(2+)、Pb^(2+)、Zn^(2+)的初始穿透时间和运移平衡时间都有不同程度的缩短,其中对Zn^(2+)初始穿透和运移平衡时间影响的差距最大,且高岭土对Cu^(2+)、Zn^(2+)的吸附量都减少,对Pb^(2+)的吸附量几乎不变;Cu^(2+)、Pb^(2+)、Zn^(2+)三种离子中,Pb^(2+)达到初始穿透和运移平衡的时间最长且吸附量最大,而Zn^(2+)达到初始穿透和运移平衡的时间最短且吸附量最小.

The transport process of heavy metals in soil is extremely complicated,and the different properties and structures of soil will also affect the transport.By adding different concentrations of Ca^(2+)solution to kaolin to simulate the real calcium-bearing soil,the effect of calcium content in kaolin on the migration of Cu^(2+),Pb^(2+)and Zn^(2+)was studied,and the migration law of Cu^(2+),Pb^(2+)and Zn^(2+)in calcium-containing kaolin was analyzed.It is concluded that with the increase of calcium content of kaolin,the initial penetration time and migration equilibrium time of Cu^(2+),Pb^(2+)and Zn^(2+)are shortened to varying degrees,and the difference between the initial penetration time and migration equilibrium time of Zn^(2+)is the largest.The adsorption capacity of kaolin for Cu^(2+)and Zn^(2+)decreases,while that for Pb^(2+)remains almost unchanged.Among Cu^(2+),Pb^(2+)and Zn^(2+)ions,Pb^(2+)has the longest time to reach the initial penetration and migration equilibrium and the maximum adsorption amount,while Zn^(2+)has the shortest time to reach the initial penetration and migration equilibrium and the minimum adsorption amount.