包覆型溶剂浸渍树脂吸附铟（III）和铁（III）

摘要

Coated solvent impregnated resins were prepared with reactive polymers,tertiary amine ion exchange resin (D301) as the carrier,2-ethylhexyl phosphoric acid mono (2-ethylhexyl) phthalate (P507) as the ex-tractant and polyvinyl alcohol as the coating materials. The adsorption capability of as-prepared resins for indi-um( III) and iron( III) in sulfuric acid was tested. Static adsorption experiments showed that the optimal ad-sorption pH values of indium(III) and iron(III) from sulfuric acid system were 1. 5 and 1. 3,and the equilib-rium time for indium( III) and iron( III) at 298 K was 6 h and 10 h,respectively. The adsorption isotherm of indium( III) and iron( III) followed Langmuir adsorption isotherm,and the increase of temperature was benefi-cial for adsorption. In the binary solution containing indium(III) and iron(III),the maximum adsorption ca-pacities of indium( III) and iron( III) were 27. 33 mg/g and 7. 63 mg/g,respectively. Dynamic adsorption ex-periment showed that the adsorption capacities basically remained unchanged after 10 times adsorption-elution-adsorption cycles.%以叔胺离子交换树脂(D301)为载体,2-乙基己基磷酸单(2-乙基己基)酯(P507)为萃取剂,聚乙烯醇( PVA)为包膜材料制备了包覆型溶剂浸渍树脂.研究了该树脂在硫酸体系中吸附铟( III)和铁( III)的性能.静态实验表明：树脂对铟(III)、铁(III)的最佳吸附pH值分别为1．5,1．3；298 K下对铟(III)和铁(III)的吸附平衡时间分别为6 h,10 h；等温吸附均符合Langmuir模型,升温有利于吸附；在铟( III)和铁( III)混合体系中,对铟( III)和铁( III)的饱和吸附量分别为27．33 mg/g,7．63 mg/g.动态实验表明：经过10次吸附—洗脱—吸附循环,树脂对铟( III)的吸附量基本不变.