D301树脂的胺基化改性及其对AuCl_4^-的吸附性能

Amino Modification of D301 Resin and Its Adsorption Characteristics to AuCl_4^-

以D301树脂表面的胺基与过硫酸铵构成氧化?还原引发体系,将单体甲基丙烯酸缩水甘油酯(GMA)接枝聚合到D301树脂表面,制得接枝材料D301-g-PGMA;通过聚甲基丙烯酸缩水甘油酯(PGMA)分子链上的环氧基团与乙二胺中胺基的开环反应,实现接枝材料的胺基化改性,制得吸附材料D301-g-APGMA,考察了接枝聚合条件对接枝率的影响及胺基化反应条件对胺基含量的影响,对材料的结构进行了表征,研究了其对Au Cl4?的吸附性能.结果表明,在GMA用量10 m L、过硫酸铵为单体质量的1.5%及40℃条件下反应18 h,PGMA接枝率达41.15%.胺基化改性时,在90℃下反应8 h,D301-g-PGMA上环氧键的开环率达91.67%.改性后D301-g-APGMA对Au Cl4?的吸附能力比D301树脂有较大提升,吸附容量达276.74 mg/g.D301-g-APGMA具有良好的再生与重复使用性能.

Glycidyl methacrylate（GMA） was grafted onto the surface of D301 resin to obtain grafting material D301-g-PGMA by using oxidation–reduction initiating system composed of the amino groups of D301 resin and ammonium persulfate in the solution, the amino modified functional adsorption material D301-g-APGMA was obtained via ring-opening reaction between epoxy groups of molecular chain of polyglycidyl methacrylate（PGMA） and amine groups of ethylenediamine. The effects of grafting polymerization conditions on grafting rate were examined, its structure was characterized, and adsorption to Au Cl4- also studied. The results showed that the grafting rate of PGMA could be as high as 41.15% under the conditions of GMA 10 m L, ammonium persulfate 1.5% of GMA mass, reaction for 18 h at 90 ℃. Compared with D301 resin, the adsorption ability of D301-g-APGMA to Au Cl4- was greatly improved, and the adsorption capacity reached up to 276.74 mg/g. And D301-g-APGMA also possessed excellent reproducibility and reusability.