纤维素基磁性聚偕胺肟树脂的研究──Ⅲ.树脂吸附KMnO_4动力学  

Studies on Cellulose-Based Magnetic Polyamidoxime Adsorbents──Ⅲ. Adsorption Kinetics of Adsorbents for KMnO_4

作　　者：吴锦远[1] 杨超雄[1] 林力克[1] 

机构地区：[1]中国科学院广州化学研究所,广州510650

出　　处：《纤维素科学与技术》1999年第1期15-23,共9页Journal of Cellulose Science and Technology

基　　金：中国科学院广州化学研究所纤维素化学开放研究实验室资助

摘　　要：研究了酸式和碱式纤维素基磁性聚偕胺后树脂（AMAO、BMAO）吸附KMnO4动力学。AMAO吸附KMnO4为二级反应，速车常数为9．0×10-4s－1。参加吸附的AMAO上的偕胺后基（）总量与被吸附的KMnO4总量的摩尔比的测定结果表明偕胺时基与KMnO4等摩尔结合，化学吸附占绝对优势。BMAO超当量吸附KMnO4，吸附容量对KMnO4浓度关系符合Freundlich等温吸附式和Langmuir等温吸附式，暗示着BMAO对KMnO4同时进行化学和物理吸附。测得KMnO4与配体结合的摩尔比2．1，吸附平衡常数为9．65×1010。参加吸附的BMAO上的偕胺肟基总量与被吸附的KMnO4总量的摩尔比为2：9，即物理吸附与化学吸附的比例为8：1，显然，在BMAO吸附KMnO4过程中以物理吸附为主。　Adsorption kinetics of acidic and alkaline cellulose-based magnetic polyamidoximeadsorbents(AMAO, BMAO)for KMnO4 was investigaed. Adsorption of AMAO for KMnO4 is sec-ond order reaction, the rate constant was found to be 9.0×10-4s-1. Equimolar combination of ad-sorbing KMnO4 and the amidoxime groups participated in adsorpion shows the chemical adsorptionis predondnant. The fact of super-equivalent adsorption of BMAO for KMnO4 and the relationshipbetween the adsorption capacity and KMnO4 concentration in accordance with Freundlich equationand Langmuir adsorption isotherm suggests chemical adsorption and physical adsotption takenplace at the same time. The combination ratio of AO ligands with KMnO4 and the equilibrium con-stant were measured to be 2. 1 and 9.65×1010, respectively. The combination amount of adsorb-ing KMnO4 and the amidoxime groups in solution was determined to be 4.5 moar ratio, nemely,the propertion of physical adsorption versus chemical adsorption is about eight to one. Obviously,the physical adsorption is the primary course of BMAO for KMnO4.

关 键 词：纤维素 磁性树脂 聚偕胺肟 吸附 动力学 

分 类 号：O636.11[理学—高分子化学] O647.32[理学—化学]