110树脂对铅(Ⅱ)的吸附行为

The Adsorption Behavior of 110 Resin for Pb(Ⅱ)

研究110树脂对铅的吸附行为,考查介质pH、温度、吸附时间等因素对吸附过程的影响。测得在HAc—NaAc体系中pH=5.73时吸附最佳;静态饱和吸附容量为681.75mg.g-1;表观吸附速率常数k298=3.39×10-5s-1;表观吸附活化能Ea=17.52kJ.mol-1;吸附服从Langmuir和Freundlich等温式;热力学参数ΔH=43.31kJ.mol-1,ΔG=-15.24 kJ.mol-1,ΔS=0.196kJ.mol-1.K-1;HCl和CdCl2使树脂的吸附量减少,而MgCl2和NaCl对吸附量基本没影响;并对负载树脂解吸进行探讨,用红外光谱方法讨论了吸附机理。

The adsorption behavior of 110 resin for Pb（Ⅱ）were inverstigated.And the influences of medium pH,temperature,retention time on adsorption process are studied.110 resin has a good adsorptivity for Pb（Ⅱ） in HAc-NaAc medium at pH=5.73.The statically saturated adsorption capacity is 681.75mg·g-1 at 298K.The apparent adsorption rate contant is k298=3.39×10-5s-1.The apparent adsorption activation energy of 110 resin for Pb（Ⅱ） is 17.52kJ·mol-1.The adsorption behavior of 110 resin for Pb（Ⅱ）obeys the Langmuir and Freundlich isotherm.The adsorption thermodynamic parameters of 110 resin for Pb（Ⅱ） are enthalpy changeΔH=43.31kJ·mol-1,ΔG=-15.24kJ·mol-1,ΔS=0.196kJ·mol-1·K-1.HCl and CdCl2 made the adsorption quantity of 110 resin acutely decrease,while MgCl2 and NaCl made on the adsorption quantity of 110 resin almost no influence.The desorption process of Pb（Ⅱ） from the pregnant resin is also researched.The adsorption mechanism of 110 resin for Pb（Ⅱ）was confirmed by chemical analysis and IR spectrometry.