纤维素基磁性聚偕胺肟树脂的研究──Ⅱ.贵金属配阴离子在BMAO上吸附动力学  

Studies on cellulose-based magnetic polyamidoxime adsorbents──Ⅱ.Adsorption kinetics of BMAO for noble-metal complex anions

作　　者：吴锦远[1] 杨超雄[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》1998年第2期45-56,共12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：纤维素基磁性聚偕胺肟树脂（BMAO）吸附AuCl-4、IrCl2-6、PdCL2-4和PtCl2-6等贵金属配阴离子符合Freundlich等式和Langmuir等温吸附方程。动力学研究表明，吸附同属二级反应，但本质不同；粒内扩散是吸附速度的控制阶段。测定了浓集因素、分配系数、吸附效率及pH值变化对吸附容量的影响。从扫描电镜观察论证了AuCl-4和IrCl2-6在BMAO上吸附时发生的氧化还原反应及由此表现出来的超当量吸附。Adsorption of noble - metal compex amons such as AuCl4, liC, PdCl-and Ptcl adsorbed by cellulase - based magnetic pogly amidoxime adsorbent (BMAO) accords with Fre-undlich equation and bogrmuir adsorption isotherm. StUdie8 of adsolption kinetics show that allthe adsorptions are second - order reaction but there are essential differences between them. Theintwicle diffoion is the xate - detendning step. Concentraion factors, distribution coefficients, adsorption efficiencies and the effects of pH on adsorption capacity were measured. Observaion of SEM suggests that the redox reaction takes place during adsorption of Aucl and liclby BMA0, and brings about the super - equivalent adsorption.

关 键 词：纤维素基 磁性树脂 聚偕胺肟 贵金属 吸附 

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