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| 201×7阴离子交换树脂对低浓度铂的吸附性能 |
| Adsorption of Low Concentration Platinum from Chloride Leaching Solution with 201×7 Ion-exchange Resin |
| 投稿时间：2013-10-16 |
| DOI： |
| 中文关键词: 物理化学 阴离子交换树脂 铂 吸附 动力学 热力学 |
| 英文关键词: physical chemistry anion-exchange resin platinum adsorption kinetics thermodynamics |
| 基金项目:国家“973”计划项目 (2014CB643406)、国家自然科学基金?云南联合基金(U0937601)、国家863基金(2011AA03A405)。 |
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| 中文摘要: |
| 研究了用201×7强碱性阴离子交换树脂对氯化浸出液中低浓度铂的吸附性能，考察了树脂用量、吸附时间、pH值、反应温度等因素对树脂吸附铂的影响。实验结果表明，pH=1.0时树脂的吸附效果最佳，静态饱和吸附容量可达到190 mg Pt/ g干树脂，铂在201×7树脂上的吸附是吸热反应，温度升高有利于铂的吸附，吸附反应热焓变ΔH=36.72 kJ/mol，熵变为ΔS=0.190 kJ/(mol.K)。对201×7树脂吸附铂的吸附等温模型及动力学进行了分析，结果表明，吸附平衡过程符合Langmuir等温式，且为优惠吸附；铂的吸附过程符合准二级动力学方程，准二级常数为k2=1.58×10-4 g/(mg.min)。用2.4 mol/L的高氯酸可将载铂树脂中的铂洗脱，洗脱率为83%。 |
| 英文摘要: |
| The adsorption behaviors of PtCl62- from chloride leaching solutions with 201×7 ion-exchange resin were investigated. The influences of various factors on the adsorption of PtCl62- were studied, including resin dosage, contact time, initial pH of the solution, reaction temperature and solution flow rate. The results showed that maximum adsorption capacity was 190.0 mg Pt /g resin at pH 1.0. The adsorption of PtCl62- on 201×7 resin fitted the Langmuir isotherm better than the Freundlich isotherm. The thermodynamic parameters of ΔS and ΔH were 0.190 kJ/(mol.K) and 36.72 kJ/mol, respectively. It indicated that this adsorption process was endothermic in nature. The kinetic data of adsorption fitted well to the pseudo-second-order model, and the kinetic parameters k2 was 1.58×10-4 g/(mg.min). The Pt loaded on the resin could be effectively eluted with 2.4 mol/L perchloric acid solution, and the elution percentage was 83%. |
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