【摘要】 棉花经碱化、老化和磺化得黏胶液 ,再用热溶胶转相法制得球形纤维素珠体。对纤维素珠体进行交联、接枝 ,研制出球形羧基纤维素吸附剂。在黏胶的制备过程中 ,棉与碱的最佳质量比为 1∶1,老化时间 6 0h ,磺化温度 2 3℃、磺化时间 3 0h ,CS2 用量为碱纤维素中纤维素质量的35 6 %。在成球过程中 ,V (黏胶 )∶V(变压器油 ) =(1 0∶3 5 )～ (1 0∶2 0 )。交联的最佳条件为 :交联温度 75℃ ,环氧氯丙烷用量 14mL ,碱液质量分数为 10 %。接枝的主要因素包括丙烯腈浓度 2 95mol/L、Ce4 + 盐浓度 0 0 0 72mol/L、接枝反应时间 1 0h以及接枝反应温度 2 5℃。这种球形纤维素吸附剂在不同溶液 /溶剂中的膨胀系数为 1 0 0～ 1 36 ,能经受 1 2mol/L的HCl和 1 0mol/L的NaOH水溶液 15次的反复处理 ,而且对Cr3 + 、Al3 + 、Cu2 + 、Zn2 + 金属离子的吸附容量分别为 2 8 1、14 6、49 2和 37 3mg/g。更多还原

【Abstract】 After basification with 18% aqueous NaOH solution and aging for 60 h of raw material cotton,the basified cotton was xanthated with CS 2 at 23 ℃ for 3 0 h to form viscose.Then spherical cellulose beads were prepared by dispersing the viscose into transformer oil[ V (viscose)∶ V (oil)=1 0∶(3 5-2 0)] with thermal gel transition technique.Spherical cross linked cellulose was prepared by crosslinking with epichlorohydrin at 75 ℃ under alkaline condition.The carboxyethyl cellulose adsorbent was made by grafting on the matrix of cross linked cellulose beads with 2 95 mol/L acrylonitrile at 25 ℃ for 1 h applying 0 0072 mol/L Ce 4+ solution as initiator,and then saponifying with aqueous NaOH solution at 75 ℃ for 2 0 h.Properties of the adsorbent were also studied.It can be concluded that the swelling coefficients of the spherical cellulose adsorbent in various solutions/reagents are among the ranges of 1 00-1 36.Moreover,almost no loss was observed after 15 times of alternate treatments with 1 2 mol/L HCl and 1 0 mol/L NaOH.The adsorption capacities of the spherical cellulose adsorbent are 28 1,14 6,49 2 and 37 3 mg/g for Cr 3+ ,Al 3+ ,Cu 2+ and Zn 2+ respectively.更多还原