吸附条件对活性碳纤维SACF氧化还原吸附Ag^＋的影响  

Effects of Adsorption Conditions on Redox Adsorption of Ag￣+ onto Activated Carbon Fiber SACF

作　　者：岳中仁[1] 陆耘[1] 符若文[1] 曾汉民[1] 

机构地区：[1]中山大学材料科学研究所

出　　处：《离子交换与吸附》1995年第5期395-401,共7页Ion Exchange and Adsorption

基　　金：国家自然科学基金;国家教委博士点基金;广东省自然科学基金

摘　　要：本文研究了吸附条件对活性碳纤维ＳＡＣＦ氧化还原吸附Ａｇ＋的影响。结果表明：Ａｇ＋初始浓度的提高，反应温度的升高均可提高ＳＡＣＦ对Ａｇ＋的吸附量；Ａｇ＋的吸附量还强烈地依赖于溶液的ｐＨ值，用ＮａＡＣ、ＨＡＣ＋ＮａＡＣ或ＮＨ３·Ｈ２Ｏ调高Ａｇ＋溶液的ｐＨ，可有效地增加ＳＡＣＦ对Ａｇ＋的吸附量；用ＮＨ３·Ｈ２Ｏ调节会出现一个最佳的ｐＨ值；通过增加ＳＡＣＦ用量，Ａｇ＋的吸附率可达９９％以上。这些影响因素均可通过能斯特（Ｎｅｒｎｓｔ）方程来说明。高ｐＨ值下，Ａｇ＋吸附平衡时间要比低ｐＨ值下长。In this paper, the effects of adsorption conditions on redox adsorption of Ag+ onto activated carbon fiber (SACF) were investigated. The adsorption capacity of Ag+ on SACF increased with the increase of concentration of Ag+, reaction temperature, and strongly dependd on the pH value. Higher pH value adjusted with NaAc, HAc+NaAc or NH3. H2O improved the redox adsorption of Ag+ on SACF. An optimum pH adjusted with NH3. H2O was observed.The adsorption ratio of Ag+ could reach up to 99% by increasing the amount of SACF added.These effects of adsorption conditions call be characterized by Nernst equation. At a higher pH value the equilibrium time for adsorption of Ag+ is longer than that at a lower pH value.

关 键 词：碳纤维 氧化还原 吸附条件 银离子 SACF 

分 类 号：O647.3[理学—物理化学] O614.122[理学—化学]