大孔膦酸树脂对镉(Ⅱ)的吸附性能及其机理  

Studies on the sorption behavior and mechanism of macroporous phosphonic acid resin for cadmium(Ⅱ)

作　　者：熊春华[1] 吴香梅[1] 

机构地区：[1]浙江丽水师范专科学校化学系,丽水323000

出　　处：《环境科学学报》2000年第5期627-630,共4页Acta Scientiae Circumstantiae

基　　金：浙江省教委科研资助!项目 (编号为 972 1 1 )

摘　　要：用大孔膦酸树脂对镉的吸附性能及其机理进行了研究 ,树脂对镉的静态和动态的吸附容量分别为 1 69 2和 1 62 7mg[Cd(Ⅱ ) ]/g(树脂 ) ,用 1 - 3mol·L- 1 HCI可以定量洗脱 .测得吸附热力学参数分别为 :ΔH =9 1 4kJ·mol- 1 ,ΔG =- 3 2 6kJ·mol- 1 ,ΔS =41 6J·mol- 1 ·K- 1 ,等温吸附遵循Freundlich曲线 ,表现吸附速率常数k2 98=3 6× 1 0 - 4 s- 1 ,用化学和红外光谱等方法讨论了吸附机理 .The sorption behavior and mechanism of macroporous phosphonic acid resin(MPAR)for cadmium(Ⅱ) were investigated.The static and dynamic sorption capacities of MPAR for Cd (Ⅱ) are 169 2 and 162 7?mg(Cd(Ⅱ))/g(MPAR),respectively.Cd(Ⅱ) adsorbed on MPAR can be eluted quantitatively with 1—3?mol·L -1 hydrochloric acid.The sorption parameters of thermodynamic are Δ H =9 14?kJ·mol -1 ,Δ G =3 26?kJ·mol -1 ,Δ S =41 6?J·mol -1 ·K -1 ,respectively.The sorption behavior of MPAR for Cd(Ⅱ) obeys the Freundlich isotherm.The apparent sorption rate constant is k 298 =3 6×10 -4 s -1 .The sorption mechanism of MPAR for Cd(Ⅱ) was confirmed by chemical analysis and IR spectra.

关 键 词：镉 吸附 大孔膦酸树脂 离子交换吸附 

分 类 号：O647.33[理学—物理化学] O647.316.2[理学—化学]