期刊
ADSORPTION SCIENCE & TECHNOLOGY
卷 36, 期 3-4, 页码 1049-1065出版社
SAGE PUBLICATIONS INC
DOI: 10.1177/0263617417748112
关键词
Solid-phase extraction; bis(2-ethylhexyl)phosphoric acid/SiO2-P; adsorption; rare earth elements; gadolinium
资金
- National Natural Science Foundation of China [91126006, 11305102]
- Major Science and Technology Program for Water Pollution Control and Treatment [2015ZX07406006-06]
For the adsorption and recovery of rare earth elements from aqueous nitric acid, solid-phase extraction resins were prepared by impregnating and immobilizing of bis(2-ethylhexyl)phosphoric acid extractant into the macroporous silica-based polymeric (SiO2-P) particles. It was found that bis(2-ethylhexyl)phosphoric acid/SiO2 -P had higher adsorption distribution coefficient for heavy rare earth elements than for light rare earth elements. The adsorption capacity of Gd(III) was observed to be 0.315 mmol g(-1) by bis(2-ethylhexyl)phosphoric acid/SiO2-P in 0.1 M HNO(3 )at 298 K, which increased slightly when increasing temperature from 298 to 323 K. The adsorption isotherms of Gd(III) matched well with the Langmuir and Freundlich models. The obtained thermodynamic parameters (Delta H degrees and Delta G degrees) showed that the adsorption of Gd(III) by bis(2-ethylhexyl)phosphoric acid/SiO2-P was a spontaneous and exothermic process. This study also evaluated the chemical stability of bis(2-ethylhexyl)phosphoric acid/SiO2-P treated with nitric acid at different temperatures and demonstrated that bis(2-ethylhexyl)phosphoric acid/SiO2-P had considerable stability against nitric acid and heat.
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