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探讨了改性松针(GXLsp)作为吸附剂对水体中铅离子的吸附性能,考察了吸附时间、溶液pH值、吸附剂用量、盐离子浓度、Pb(II)初始浓度及温度对改性松针吸附Pb(II)的影响。利用Langmuir和Freundlich等温线模型对实验数据进行非线性拟合分析,结果表明,Freundlich等温线模型能很好地描述松针对Pb(II)的吸附过程。热力学参数表明吸附是一个自发的吸热过程。改性松针对铅的吸附行为符合拟二级动力学方程,表明吸附过程是以化学吸附为主。在293K时松针对Pb(II)的饱和吸附量为318.3 mg/g,因此,GXLsp可作为一种高效低值生物质吸附剂以去除水体中重金属Pb(II)的污染。
The adsorption of Pb (Ⅱ) with water on the surface of modified pine needles (GXLsp) was investigated. The effects of adsorption time, pH value, amount of adsorbent, salt ion concentration, initial concentration of Pb Effect of Pb (II). Nonlinear fitting analysis of experimental data using Langmuir and Freundlich isotherms showed that Freundlich isotherm model can well describe the adsorption process of pine needles on Pb (II). Thermodynamic parameters indicate that adsorption is a spontaneous endothermic process. The adsorption behavior of modified pine needles was in line with the pseudo-second-order kinetic equation, indicating that the adsorption process was dominated by chemical adsorption. The saturated adsorption of Pb (II) by pine needles was 318.3 mg / g at 293K. Therefore, GXLsp can be used as a high-efficiency and low-value biomass adsorbent to remove the pollution of heavy metals Pb (II) in water.