硝化改性浸渍树脂吸萃铟(Ⅲ)的研究

Sorption and extraction of indium(Ⅲ) with modified impregnated resin by nitrating benzene rings on its supporter

用不同体积比的浓硝酸和浓硫酸混合液对载体苯乙烯-二乙烯基苯聚合物(HZ818)进行硝化改性,以仲辛基苯氧基乙酸(CA-12)为萃取剂,采用干法浸渍技术制备出了硝化改性CA-12浸渍树脂.以静态和动态方法研究了硝化改性浸渍树脂在盐酸体系中吸附、脱附铟(Ⅲ)的性能.研究结果表明:当浓硝酸和浓硫酸的体积比为1∶2.5,硝化改性树脂吸铟性能最好;当溶液pH=3、温度为25℃时,硝化改性树脂的饱和吸附容量为37.6 mg/g;硝化改性树脂的吸附等温线符合Langmuir等温吸附模型;与未改性的CA-12浸渍树脂相比,其吸附时间明显缩短,树脂的稳定性更高.

Styrene-divinylbenzene copolymer（HZ818） as the supporter was firstly modified by nitrating its benzene ring,and the nitration reagent was different volumetric mixture of concentrated HNO3 and concentrated H2SO4.Then the modified impregnated resins were prepared by a dry-impregnation technique using modified HZ818 as the supporter,sec-octylphenoxyl acetic acid（CA-12） as the extractant.Indium（Ⅲ） adsorption and desorption properties of this resin in hydrochloric acid medium were investigated by batch and column method.It was found that the modified impregnated resins showed the optimum adsorption properties when volume ratio of concentrated HNO3 and concentrated H2SO4 at 1∶2.5,pH=3,and the adsorption capacity was 37.6 mg/g at 25 ℃.The Langmuir adsorption isotherm gave a satisfactory fit of the equilibrium data.Compared with the solvent impregnated resins prepared by conventional method,the adsorption time for the modified impregnated resins was significantly shortened,and the stability of the modified impregnated resins was better.