一种新型球形纤维素螯合吸附剂的制备

Preparation of a Novel Spherical Cellulose Chelating Adsorbent

中文关键词:  球形纤维素  螯合吸附剂  接枝  微波催化  咪唑基

Key Words:spherical cellulose  chelating adsorbent  grafting  microwave catalytic  imidazolyl

中文摘要:

      以硫酸盐马尾松浆纤维素为原料制备黏胶纤维，利用热溶胶转相法和反相悬浮技术制得球形纤维素珠体，然后对其进行接枝和微波催化改性制备球形纤维素螯合吸附剂SCCA，并应用现代分析测试方法对SCCA进行理化性能表征。研究表明，SCCA含咪唑基和羧基等特征官能团，改性的最佳条件为：单体与珠体质量比为5∶1，引发剂硝酸铈铵与硝酸的浓度分别为9.12 mmol/L和0.1 mol/L，反应温度50℃，反应时间60 min；微波功率600 W，辐射时间60 s，二乙烯三胺浓度4.85 mol/L，催化剂浓度0.39 mol/L。制备的SCCA对Cr³⁺的吸附容量为38.53 mg/g。

Abstract:

      Viscose was prepared with masson pine kraft pulp, and the spherical cellulose beads were obtained by applying the thermal solution-gel transition technique, the cellulose beads were modified by grafting and microwave catalysis to prepare spherical cellulose adsorbent SCCA whose physical and chemical properties were identified by the modern analytical methods. The study showed that the SCCA contains caoboxyl and imidazolyl groups. The optimum modified conditions are as follows: the concentration of initiators cerium nitrate and ammonium are 9.12 mmol/L and 0.1 mol/L respectively, grafting temperature is 50℃ and grafting time is 60 min. The optimum microwave modification conditions are 4.85 mol/L of diethylenetriamine and 0.39 mol/L of the catalyst, radiating for 60 s with 600 W power. The resultant adsorption capacity of Cr3+ is 38.53 mg/g.