海藻酸钠/聚乙烯亚胺复合材料对Pb(Ⅱ)的吸附性能研究

Adsorption of Pb(Ⅱ) by Sodium Alginate/Polyethyleneimine Composite Materials

以海藻酸钠和聚乙烯亚胺为原料,制备海藻酸钠/聚乙烯亚胺(SA/PEI)复合材料,研究其对水中Pb(Ⅱ)的吸附去除性能。系统研究了各因素对SA/PEI吸附Pb(Ⅱ)效果的影响。结果表明,SA/PEI对Pb(Ⅱ)的吸附量与Pb(Ⅱ)初始浓度正相关,在360 min达到吸附平衡。吸附过程符合拟二级动力学和Langmuir等温吸附模型。在303.15 K时,Langmuir等温吸附模型拟合得到的最大吸附量为316.46 mg/g。第6次使用的SA/PEI对Pb(Ⅱ)仍表现出较好的去除效果。

Sodium alginate/polyethyleneimine(SA/PEI)composite materials were prepared with sodium alginate(SA)and polyethyleneimine(PEI)as raw materials.The adsorption and removal performance of Pb(Ⅱ)from water by gel spheres was studied.The effects of various factors on the adsorption of Pb(Ⅱ)by SA/PEI were systematically studied.The results showed that the adsorption capacity of Pb(Ⅱ)on SA/PEI were positively correlated with the initial concentration of Pb(Ⅱ),and the adsorption equilibrium was reached in 360 min.The adsorption process accords with pseudo-second-order kinetics and Langmuir isothermal adsorption model.At 303.15 K,the maximum adsorption capacity fitted by Langmuir isothermal adsorption model was 316.46 mg/g.The sixth application of SA/PEI still showed a good removal effect on Pb(Ⅱ).