突发应急中粉末活性炭、沸石粉和抛光树脂对金属镉吸附实验研究

Experimental study on adsorption of metal cadmium by powdered activated carbon,zeolite powder and polishing resin in sudden emergency

研究模拟突发应急的水体镉污染,通过分析pH、初始浓度和吸附时间等因素变化对粉末活性炭、沸石粉和抛光树脂吸附重金属镉离子的影响,并通过比较选择最优吸附材料。结果表明,三种吸附材料对镉离子的吸附受pH值变化波动较大,随着pH增加,吸附效果也在增强,pH=8时,吸附量分别达到了0.905,1.168,1.162 mg/g;初始浓度也影响着吸附反应的进行,初始浓度越高,吸附量越大,三种材料对镉离子吸附在120 min后基本达到饱和状态,准二级动力学方程能够更好地拟合三种材料对镉的吸附,Langmuir等温吸附模型拟合程度最高;所选实验材料吸附性能排序为:抛光树脂>沸石粉>粉末活性炭。

This study simulates cadmium pollution in water bodies during emergencies,the effects of pH,initial concentration and adsorption time on the adsorption of heavy metal cadmium ions by powdered activated carbon,zeolite powder and polishing resin are analyzed,and the optimal adsorption materials are selected by comparison.The results show that the adsorption of metal cadmium ions by three kinds of adsorbent materials fluctuates greatly with the change of pH,with the increase of pH,the adsorption effect is also enhanced.At pH=8,the adsorption amount reaches 0.905,1.168,1.162 mg/g;the initial concentration also affects the progress of the adsorption reaction,the higher the initial concentration of cadmium ions,the larger the adsorption amount,the adsorption of cadmium ions on the three materials reached saturation state after 120 min,the quasi-second-order kinetic equation can better fit the adsorption of cadmium ions by three materials,Langmuir isotherm adsorption model has the highest degree of fit;The adsorption performance of the selected experimental materials was ranked as:polishing resin>zeolite powder>powdered activated carbon.