改性木质素磺酸钠对铅离子的吸附行为研究

研究了过氧化氢氧化和亚硫酸钠磺化改性后的木质素磺酸钠对水溶液中铅离子的吸附性能. 分别考察了溶液pH值、初始浓度、吸附时间、温度对吸附性能的影响. 实验结果表明，在溶液pH值为1.5-5时，改性木质素磺酸钠对铅离子的平衡吸附量随着pH值的增大而变大；改性木质素磺酸钠对铅离子的平衡吸附量随着温度的升高增加不明显. 在最佳吸附pH值下，改性木质素磺酸钠对铅离子的吸附量随着溶液初始浓度的增加而增大，120 min达到吸附平衡时，铅的饱和吸附量可达到55.22 mg/g. 改性木质素磺酸钠对铅离子的静态吸附过程较好地符合Langmuir等温吸附模型，吸附过程符合准一级动力学模型.

Adsorption Behavior of Lead Ion on Modified Sodium Lignosulfonate

Lignosulfonate modified by hydrogen?peroxide and sodium sulfite on adsorption of lead ion in aqueous solution was studied. Effects of initial metal ion concentration， pH values， adsorption temperature and time on adsorption behaviors were explored. The results show that the equilibrium adsorption capacity of lead ion increases with the pH values rising from 1.5 to 5； while the effect of adsorption temperature is not obvious on the equilibrium adsorption capacity. Under the optimal adsorption condition， the adsorption of lead ion gets adsorption equilibrium at 120 min， and the saturated adsorption amount of lead ion is up to 55.22 mg/g. The results of thermodynamics study demonstrate that the adsorption of lead conforms to Langmuir adsorption isotherm and the pseudo-first-order kinetics equation.