以漂白蔗渣浆纤维素为基体，二乙烯三胺为单体，硝酸铈铵为引发剂，制备胺基接枝纤维，得到高效重金属吸附剂。研究了单体用量、引发剂用量、温度、时间等反应因素对胺基接枝纤维制备的影响。采用红外光谱、X射线衍射和扫描电镜分析表征胺基接枝纤维的结构。从温度、时间、pH值、接枝纤维加入量和铜离子溶液初始浓度方面对胺基接枝纤维吸附二价铜离子进行研究，探究较好的吸附条件。结果表明，当绝干蔗渣纤维∶单体二乙烯三胺=1∶1（质量比），硝酸铈铵的用量为25%，温度为70℃，时间为2h时，可以获得较高的吸附量，其吸附量可以达到12.8 mg·g-1。通过红外光谱和扫描电镜分析手段对接枝纤维的结构进行表征。胺基接枝纤维对铜离子溶液吸附的较优条件为：时间20min，温度为30℃，pH值为4.5，初始浓度为400mg·L-1。对吸附过程进行动力学研究，拟合得到Lagrange二级动力学方程y=0.0116x+0.021。%In this paper, using bleaching bagasse pulp cellulose as substrate, diethylene triamine as monomer and cerium ammonium nitrate as initiator, amino-grafted fiber was prepared, then it attained efficient heavy metals adsorbent. The influence of monomer dosage, initia-tor dosage, temperature, time and other factors on the preparation of amino-grated fiber were investigated. The structure of amino-grafted fiber was characterized by FTIR spectra, X-ray diffraction and scanning electron microscope analysis. In addition, it studied amino-grafted fiber absorbent on Cu (Ⅱ) ions, which did adsorption research to explore better adsorption conditions from the following aspects including temperature, time, pH value, grafted fiber content and the initial concentration of copper ions solution. The results showed that mass ratio both oven dried bagasse fiber and monomer diethylene triamine was 1:1, the dosage of ammonium ceric nitrate was 25%, temperature was 70℃, time was 2h, which could receive higher adsorption capacity for copper ions reaching 12.8 mg/g. The structure of grafted fiber was characterized by FTIR spectra and scanning electron microscope analysis. Eventually, better conditions for amino-grafted fiber adsorption of copper ion solution were:time was 20min, temperature was 30℃, pH value was 4.5, the initial concentration was 300~400mg/L. Doing kinetics research on adsorption process, Lagrange second-order kinetic equations y=0.0116x+0.021 was determined.
展开▼
