纤维素基磁性聚偕胺肟树脂的研究──硝酸银在碱式树脂上的吸附  

STUDIES ON CELLULOSE-BASED MAGNETIC POLYAMIDOXIME ADSORBENTS──SILVER NITRATE UPTAKE BY ALKALINE RESIN

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：《离子交换与吸附》1997年第5期508-514,共7页Ion Exchange and Adsorption

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课题

摘　　要：研究了碱式纤维素基磁性聚偕胺肟树脂（BMAO）吸附AgNO3的行为。树脂与AgNO3溶液接触10分钟，Qt／Q∞＝0．93）接近饱和吸附。增大AgNO3浓度或液－固比，吸附容量增幅甚小，但AgNO3浓度的变化对浓集因数的影响十分显著，这一特性有利于树脂从稀溶液中回收银。扫描电镜照片显示出树脂表面上吸着大量银的微粒，表明吸附时Ag（Ⅰ）被还原为Ag（0），则氧化成羧基，进一步吸附Ag+离子。The behaviors of alkaline cellulose-based magnetic polyamidoxime adsorbent (BMAO) for silver nitrate uptake were investigated. The adsorption ratio(F= Qt/ Q∞) was found to be 0. 93 when the resins contact with AgNO3 within 10 minutes. Adsorption capacity increases a little with increasing AgNO3 concentration or the liquid-solid ratio, but the effect of AgNO3 concentration on the concentration facetor is more remarkable, hence it favors for silver recovery from dilute solution with BMAO.The SEM photographs show that a large number of micreparticles are atacked on the resins. It suggested that Ag+ ions are adsorbed by AO groups and convert to Ag(0). At the same time, the amidoxime groups are oxidized to be the carboxylic groups which can combine with Ag+ ion presented in solution.

关 键 词：纤维素基 磁性树脂 聚偕胺肟 硝酸银 吸附 

分 类 号：O647.33[理学—物理化学] O614.122[理学—化学]