烯丙基胺-细菌纤维素的制备及其动力学研究

Study on the Synthesis and Kinetics of Cellulose-graft-allylamine

基于Ce4+引发自由基接枝共聚机理,制备了新型的烯丙基胺-细菌纤维素(al-BC)吸附剂;考察了细菌纤维素(BC)和烯丙基胺加入量、硝酸铈铵(CAN)浓度等对接枝共聚反应的影响并探讨了其接枝动力学过程;以al-BC为吸附剂,研究其对重金属离子Pb2+的吸附性能。结果表明:在CAN浓度25mmol/L、硝酸浓度0.16mol/L、烯丙基胺及BC加入量分别为24mL/L和8g/L、温度40℃、反应时间4h的最优接枝条件下,al-BC接枝率为18.22%;根据实验结果拟合出了反应初期接枝反应动力学方程;在最优吸附条件下,al-BC对Pb2+的吸附能力比BC提高了37.53%。

Based on the graft polymerization mechanism lamine （al-BC） as a new adsorbent was prepared. In this paper, of Ce4＋ triggering free radicals, cellulose-graft-allyeffects of factors on grafting yield were investigated, such as monomer concentration, temperature and time of reaction and at the same time the process of graft dynamics was discussed. The al-BC adsorbent was used to research the adsorption capacity of Pb2＋. Results indicate that the graft yield would approach to 18. 22% in the optimal reaction conditions. After analyzing the results of tests, dynamic model of graft rate was deduced. The adsorption capacity of Pb2＋ on al-BC was 53.37%, which was more 37.53G than that of BC, in the best adsorption conditions.