改性木质素对PtCl _6~(2-)的吸附性能

以季铵型木质素和季铵型鳌合木质素为吸附剂,研究了吸附时间、PtCl _6~(2-)初始浓度对PtCl _6~(2-)吸附效果的影响,考察了盐酸浓度对PtCl _6~(2-)吸附选择性的影响规律,探究了吸附过程的动力学方程和等温吸附特性。结果表明,季铵型木质素吸附平衡时间和饱和吸附容量分别为300min和67.90mg/g,季铵型鳌合木质素吸附平衡时间和饱和吸附容量为120 min和218.8 mg/g;两种改性木质素在盐酸浓度为1.0mol/L时,对PtCl _6~(2-)均具有很好的吸附选择性,且盐酸浓度越低吸附选择性越好;动力学均遵循准二级方程,等温吸附模型均与朗缪尔方程拟合较好,吸附过程均为单分子层均质化学吸附。

Adsorption Properties of Modified Lignin on PtCl62-

Effects of adsorption time and initial concentration of PtCl62- on absorptivity of PtCl62- were investigated applying quaternary ammonium lignin and quaternary ammonium chelated lignin as adsorbent. Effect of hydrochloric acid concentration on adsorptive selectivity of PtCl62- was studied. Kinetic equations and adsorption isotherms of adsorption process were explored. The results show that equilibrium adsorption time and saturation adsorption capacity are 120 min and 67.90 mg/g for quaternary ammonium lignin. Equilibrium adsorption time and saturation adsorption capacity are 300 min and 218.75 mg/g for quaternary ammonium chelated lignin. Adsorption selectivity of PtCl62- is satisfactory when concentration of hydrochloric acid is 1.0 mol/L, and selectivity rises along with drop of hydrochloric acid concentration. Adsorption of PtCl62- on modified lignins is in accordance with pseudo-second-order equation and Langmuir isothermal adsorption equation, and is of chemical single molecule layer adsorption.