高炉渣对Cd~(2+)的吸附性能

采用包头钢铁集团炼铁厂的高炉渣为吸附剂(粒径0.154 nm)对Cd2+进行吸附,运用SEM技术对吸附剂进行了表征,研究了初始Cd2+质量浓度、吸附剂加入量、吸附时间、吸附温度和废水pH对Cd2+去除率的影响,并探讨了吸附机理。表征结果显示:高炉渣吸附剂具有疏松多孔的特点,表面十分粗糙,比表面积较大。实验结果表明:当吸附温度为室温(28℃)、废水pH为7、初始Cd2+质量浓度为10 mg/L、吸附剂加入量为8 g/L、吸附时间为60 min时,Cd2+去除率达到98.55%;高炉渣对Cd2+的吸附符合拟二级动力学方程和Langmuir等温吸附模型,且吸附反应易发生。

Adsorption Capability of Blast Furnace Slag to Cd2+

The blast furnace slag （particle size 0.154 nm） from an ironmaking plant of Baogang Group was used for Cd²⁺ adsorption. The adsorbent was characterized by SEM. The factors affecting the Cd²⁺ removal rate were studied and the adsorption mechanism was discussed. The characterization results show that：The blast furnace slag is a porous adsorbent,with rough surface and large specific surface area. The experimental results show that：When the adsorption temperature is atmospheric temperature （28 ℃）,the wastewater pH is 7,the initial Cd²⁺ mass concentration is 10 mg/L,the adsorbent dosage is 8 g/L and the adsorption time is 60 min,the Cd²⁺ removal rate reaches 98.55%;The adsorption of Cd²⁺ on blast furnace slag fits with the pseudo-second-order kinetics model and Langmuir isothermal adsorption model,and the adsorption reaction is easy to happen.