原子能科学技术2016，Vol.50Issue(7)：1159-1165,7.DOI:10.7538/yzk.2016.50.07.1159
氨基膦酸改性硅胶吸附分离铂和钯
Sorption and Separation of Platinum and Palladium from Aqueous Solution by Aminophosphonic Acid Functionalized Silica
徐辉 1祁光霞 2孙应龙 3王煜 1韩小元 4梁威 4雷雪飞 4张瑞荣 1王毅4
作者信息
- 1. 清华大学 环境学院，北京 100084
- 2. 西北核技术研究所，陕西 西安 710024
- 3. 北京工商大学 环境科学与工程系，北京 100048
- 4. 西北核技术研究所，陕西 西安 710024
- 折叠
摘要
Abstract
Aminophosphonic acid functionalized silica synthesized by chemical grafting method was utilized as the sorbent for separation of platinum (Pt)and palladium (Pd) from aqueous solution.The effects of pH,contact time,initial metal concentration, ionic strength and solid-liquid ratio on the sorption of Pt and Pd by functionalized silica were investigated.The sorption capacity is strongly dependent on pH but independent on the ionic strength and solid-liquid ratio.The sorption process fits the pseudo-second-order kinetic model and Langmuir isotherm very well.Equilibrium sorption capacities of 18.5 mg/g for Pt at pH=2 and 29.9 mg/g for Pd at pH=6 are achieved respectively. The distinct sorption behavior of functionalized silica for Pt and Pd with pH can be used for separation of these two metal ions in aqueous solution.The sorbed Pt or Pd can be completely eluted using 6% sulfourea in 5 mL 0.1 mol/L HNO3 .The synthesized sor-bent material can be recycled and reused.关键词
硅胶/氨基膦酸/吸附剂/铂/钯Key words
silica/aminophosphonic acid/sorbent/platinum/palladium分类
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徐辉,祁光霞,孙应龙,王煜,韩小元,梁威,雷雪飞,张瑞荣,王毅..氨基膦酸改性硅胶吸附分离铂和钯[J].原子能科学技术,2016,50(7):1159-1165,7.
