摘要
研究了D113弱酸性树脂在NaAc-HAc缓冲体系中对铟(III)的吸附性能及机理。对影响树脂吸附容量的不同因素,如溶液的pH、吸附时间和温度进行了研究。结果表明:D113弱酸性树脂对铟(III)的吸附在pH=5.00的NaAc-HAc缓冲体系中最佳,每克树脂在298 K下的静态饱和吸附容量为185 mg;在不同温度下,树脂吸附铟(III)的表观吸附速率常数分别为k288K=2.72×10.5 s.1,k298K=3.69×10.5 s.1,k308K=4.48×10.5 s.1,表观吸附活化能Ea=18.4 kJ.mol.1;测得热力学参数分别为.H=3.27 kJ.mol.1,.S=68.3 J.(mol.K).1,.G298K=.17.1 kJ.mol.1。与Freundlich等温曲线相比,吸附更加符合Langmuir等温曲线。用0.5 mol.L.1 HCl进行解吸时,解吸率为100%。此外,用红外光谱方法探讨了吸附机理,结果显示:D113树脂功能基COOH中的H与In(III)发生了离子交换;同时,C=O中的O与In(III)形成了配位键。
The sorption properties and mechanism of macroporous weak acid resin(D113 resin) for In(Ⅲ) in HAc–NaAc medium were investigated.The different variables affecting the sorption capacity,such as pH of the solution,contact time and temperature,were investigated.The results indicate that,in HAc–NaAc medium,the sorption of In(Ⅲ) on D113 resin,is optimum at pH 5.00,and the static saturated sorption capacity is 185 mg·g·^-1 resin at 298 K.The sorption rate constant determined under various temperatures are k288K = 2.72×10·5 s·^-1,k298K = 3.69×10·5 s·^-1,k308K = 4.48×10·5 s·^-1,respectively.The apparent activation energy,Ea is 18.4 kJ·mol·^-1 and the sorption parameters of thermodynamic are ?H = 3.27 kJ·mol·^-1,?S = 68.3 J?(mol?K)·^-1 and △G298K = ?17.1 kJ·mol·^-1,respectively.Compared with Freundlich isotherm,the sorption of In(Ⅲ) obeys the Langmuir isotherm better.In(Ⅲ) adsorbed on D113 resin could be eluted by 0.5 mol·L·^-1 HCl and the elution percentage is 100%.Moreover,the sorption mechanism of D113 resin for In(Ⅲ) was examined by IR spectrometry,which indicates that the H of COOH is exchanged with In(Ⅲ) and the coordination bonds are formed between oxygen atoms in C=O and In(Ⅲ).
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2012年第1期43-48,共6页
Journal of Chemical Engineering of Chinese Universities
基金
国家科技支撑计划项目(2008BAD94B09)
绿色化学合成技术国家重点实验室培育基地开放基金
关键词
D113弱酸性树脂
铟
吸附
热力学
动力学
机理
D113 weak acid resin indium sorption thermodynamics kinetics mechanism