研究论文
熊春华,吴香梅.大孔膦酸树脂对镉(Ⅱ)的吸附性能及其机理[J].环境科学学报,2000,20(5):627-630
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)
- 基金项目：浙江省教委科研资助项目(编号为97211)
- 作者
- 单位
- 熊春华
- 浙江丽水师范专科学校化学系, 丽水 323000
- 吴香梅
- 浙江丽水师范专科学校化学系, 丽水 323000
- 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169.2和162.7mg[Cd(Ⅱ)]/g(树脂), 用1-3mol·L-1HCI可以定量洗脱.测得吸附热力学参数分别为:ΔH=91.4kJ·mol-1, ΔG=-32.6kJ·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=3.6×10-4s-1, 用化学和红外光谱等方法讨论了吸附机理.
- Abstract：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 162.7mg(Cd(Ⅱ))/g(MPAR), respectively.Cd(Ⅱ) adsorbed on MPAR can be eluted quantitatively with 1—3mol·L-1 hydrochloric acid.The sorption parameters of thermodynamic are Δ H =9.14kJ·mol-1, Δ G =3.26kJ·mol-1, Δ S =41.6J·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.
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