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采用共辐射引发接枝共聚法在聚丙烯纤维上接枝苯乙烯-二乙烯苯,通过氯甲基化反应和胺化反 应制备强碱性阴离子交换纤维。当单体体积分数为20％-25％,辐射剂量率为1.2~1.8 kGy/h时,接枝率 可以控制在150%~250%。当氯甲基化反应温度(38±2)℃,反应时间15~25 h,胺化反应温度(30±2)℃, 反应时间15-20 h时,制备的强碱性阴离子交换纤维交换容量达到3.00 mmol/g以上。将该纤维对Cr(Ⅵ) 进行吸附试验,结果纤维对Cr(Ⅵ)的吸附以液膜扩散为主,吸附速度很快,8 min可达到吸附饱和,吸附反应 速率常数为0.015 s-1,静态吸附饱和容量为257.6 mg/g,吸附行为符合Freundlish等温吸附模型。
Copolymerization was used to graft styrene-divinylbenzene onto polypropylene fibers by a co-radiation initiated graft copolymerization method. Strongly basic anion exchange fibers were prepared by chloromethylation and amination. When the monomer volume fraction of 20% -25%, radiation dose rate of 1.2 ~ 1.8 kGy / h, the grafting rate can be controlled at 150% to 250%. When the temperature of chloromethylation (38 ± 2) ℃, reaction time of 15 ~ 25 h, amination temperature (30 ± 2) ℃ and reaction time of 15-20 h, the exchange capacity of strong basic anion exchange fiber Reaching 3.00 mmol / g or more. The adsorption of Cr (Ⅵ) on the fiber was studied. The results showed that the adsorption of Cr (Ⅵ) on the fiber was mainly liquid membrane, and the adsorption speed was very fast. The adsorption saturation rate was reached after 8 min. The adsorption rate constant was 0.015 s-1, The static adsorption saturation capacity was 257.6 mg / g, and the adsorption behavior accorded with Freundlish isothermal adsorption model.