改性活性炭对亚甲基蓝与Cd^(2+)复合污染物的吸附性能研究

Study on the adsorption performance of modified activated carbon for methylene blue and Cd^(2+)complex

探究改性活性炭对模拟的阳离子染料印染废水亚甲基蓝/Cd^(2+)混合溶液的吸附效果及其吸附机理。结果表明,改性活性炭对亚甲基蓝/Cd^(2+)混合溶液的吸附过程中,亚甲基蓝和Cd^(2+)存在竞争吸附与静电排斥作用,造成改性活性炭对Cd^(2+)的吸附性能降低。改性活性炭对模拟的阳离子染料溶液中两种污染物的吸附符合Langmuir模型,吸附动力学属于准二级动力学模型。对亚甲基蓝和Cd2+的吸附分别为物理吸附和物理与化学吸附共同作用的单分子层吸附。

The adsorption performance and adsorption mechanism of modified activated carbon(MAC)on dye and heavy metal ion when they were simultaneously present in the simulated wastewater were studied.The result showed that the competitive adsorption and electrostatic repulsion between methylene blue(MB)and Cd^(2+) would lead to the decreasing adsorption performance of MAC on two pollutants.While the adsorption mechanism of MAC on MB and Cd^(2+) both existed in the stimulated anion wastewater was still consistent with the Langmuir model,fitted well with pseudo-second-order model,and showed the adsorption behavior were monolayer adsorption and a combination of chemical and physical adsorption,respectively.