摘要
就氨基膦酸树脂对镉的吸咐行为进行了研究.实验结果表明,在pH=4.6时,树脂对镉的静态饱和吸咐容量为w(Cd(Ⅱ)/树脂)=247.4mg/g,表观吸咐速率常数k298=2.38×10-4s-1,且用2mol/L盐酸可以定量洗脱;测得吸咐热力学参数分别为:ΔH=3.481kJ·mol-1,ΔG=-3.17kJ·mol-1,ΔS=22.70J·mol-1·K-1,等温吸咐服从Frenndlich曲线.运用吸咐前、后的红外光谱图对照分析了树脂与镉的成键情况.
The sorption behavior of amino methylene phosphonic acid resin(APAR) for cadmium (Ⅱ) was investigated.The experimental results showed that the statically saturated sorption capacity is \{w(Cd(Ⅱ))=\}247.4 mg/g;\{Cd(Ⅱ)\} absorbed on APAR can be eluted with 2 mol·L\+\{-1\} HCl,elution percentage is 98.0%;the apparent rate constant is k\-\{298\}=2.38×10\+\{-4\} s\+\{-1\};the sorption behavior of \{APAR\} for Cd(Ⅱ),obeys the Freundlich isotherm.The sorption themodynamic parameters such as enthalpy change ΔH,free energy change ΔG and entropy change ΔS of sorption (APAR) for Cd\+\{2+\} are \{3.481\} kJ·mol\+\{-1\},-3.17 kJ·mol\+\{-1\},22.70 J·mol\+\{-1\}·K\+\{-1\}.Respectively,the sorption mechanism of APAR for Cd(Ⅱ) was examined by IR spectrometry.
出处
《浙江师范大学学报（自然科学版）》
CAS
2002年第4期388-390,共3页
Journal of Zhejiang Normal University:Natural Sciences
关键词
氨基膦酸树脂
镉
吸咐行为
吸咐性能
分析
amino methylene phosphonic acid resin
cadmium
sorption behavior
sorption property
analyse
