以腈纶废丝为原料,二甲基甲酰胺和分散剂溶液分别为溶剂和非溶剂,通过相转换法制得聚丙烯腈珠体,再采用微波辐射法对珠体进行改性,制得一种多功能球形螯合吸附剂 SPDA,并对 SPDA 进行理化性能表征。研究表明,SPDA 含有酰胺基和咪唑基等多种特征官能团,改性的最佳条件为单体和珠体质量比为7∶1,催化剂质量占珠体质量14.0%,乙二醇和珠体质量比为7∶5,微波功率为640W,辐射反应5 min。采用静态吸附法研究 SPDA 对 Cr(Ⅵ)的吸附效果,当 pH 值为4,Cr (Ⅵ)的初始质量浓度为120mg/L,吸附时间为2h,吸附温度为30℃时,去除率达到96.2%,平衡吸附容量可达38.5mg/g。
The spherical polyacrylonitrile beads were prepared via phase inversion method usting DMF as solvent and dispersant solution as non-solvent and waste polyacrylonitrile fibre as raw material.Then the spherical PAN beads were used to prepare a multifunctional spherical chelation adsorbent,denoted as SPDA,under mi-crowave assistant conditions.Besides,the physical and chemical properties were also studied.The results indi-cated SPDA contained amide and imidazolyl groups.And the optimum modified conditions included 7∶1 of the mass ratio of monomer and beads,14∶100 of the mass ratio of catalyst and beads,7∶5 of the mass ratio of EG and beads,640W of the microwave power and 5mins of the radiation time.Additionally,study was also conduc-ted regarding the adsorption of Cr(Ⅵ)on SPDA by static adsorption experiments.The removal percentage and equilibrium adsorption capacity of SPDA could reach 96.2% and 38.5mg/g under such conditions as 4 of the so-lution pH,120mg/L of Cr(Ⅵ)concentration,2h of the adsorption time and 30℃ of the adsorption tempera-ture.
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