层迭灵芝子实体及制备碳对Pb(Ⅱ)的生物吸附特性研究

Sorption Characteristics of Pb(Ⅱ) on Ganoderma lobatum and Its Biochar

以层迭灵芝子实体及其制备碳作为吸附材料,研究起始吸附剂用量、初始pH、反应时间、初始浓度对层迭灵芝及其制备碳吸附Pb(Ⅱ)的影响及吸附特性。结果表明:层迭灵芝子实体(C0)吸附Pb(Ⅱ)的最佳固液比4 g/L,而其制备碳(C400)的最佳固液比0.8 g/L,最适pH为7,最佳吸附时间为480 min,最大去除率分别为97.72%和97.60%;Langmuir和Freundlich等温吸附平衡模型均能较好的拟合C0及C400吸附Pb(Ⅱ)的吸附过程,其最大吸附量分别为90.90 mg/g和163.93 mg/g;动力学模型拟合可知,C0及C400对Pb(Ⅱ)的生物吸附过程均符合准二级动力学模型,C0对Pb(Ⅱ)的吸附速率高于C400,但C400的吸附能力高于C0。

Ganoderma lobatum （C0） and its biochar （C400） were evaluated on biosorption of Pb （II） from aqueous solutions under different conditions including adsorbent doses, initial pH, contact time and initial Pb （II） concentrations. The results showed the optimum conditions of adsorbent doses was 4 g/L （C0） and 0.8 g/L （C400）, pH 7 and contact time of 480 min and the maximum removal efficiencies of Pb （Ⅱ） for C0 and C400 were 97.72% and 97.60%, respectively. The isothermal adsorption model of Langmuir and Freundlich could well fitted the biosorption processes of C0 and C400 for Pb （Ⅱ） and their maximum sorption capacity were 90.90 mg/g and 163.93 mg/g, respectively. Kinetic model fitting indicated that the biosorption processes of C0 and C400 for Pb （Ⅱ） followed well pseudo second order kinetics. The sorption rate of Pb （Ⅱ） on C0 was significantly higher than that on C400, but sorption capacity of C400 was greater than of C0.