Position: Home > Articles > Adsorption and Reduction of Silver Ions onto Carbon Aerogels
Journal of South China Agricultural University
2008,29
(3)
101-106
酚醛基炭气凝胶对银离子的吸附性能研究
作 者：
王海清;张淑婷;余敏娜;符若文
单 位：
华南农业大学;中山大学
关键词：
炭气凝胶;还原吸附;银离子
摘 要：
以4种经常压干燥法制备的酚醛基炭气凝胶(carbon aerogels,CAs)为原料,通过静态和动态吸附试验及扫描电镜(SEM)表征,研究了材料孔结构、表面特性及溶液性质等因素对Ag+吸附性能的影响.结果表明,Ag+在炭气凝胶表面的吸附主要是以氧化还原形式进行的化学吸附,通过还原吸附的银颗粒主要分布在凝胶外表面,而吸附容量与孔结构、活化程度(表面活性还原官能团)、溶液pH、固液比例及Ag+浓度等有关.SEM图表明在不同pH的硝酸银溶液下吸附于凝胶表面的银状态不同.
译 名：
Adsorption and Reduction of Silver Ions onto Carbon Aerogels
作 者：
WANG Hai-qing1,ZHANG Shu-ting1,2,YU Min-na1,FU Ruo-wen2(1 College of Sciences,South China Agricultural University,Guangzhou 510642,China;2 Material Science Institute,Sun Yat-Sen University,Guangzhou 510275,China)
关键词：
carbon aerogels;reduction adsorption;silver ions
摘 要：
Four kinds of carbon aerogels prepared by ambient pressure technique were used to investigate the capability of adsorption silver ions onto carbon aerogels by static and dynamic adsorption experiment.The effects of pore size,the Brunauer-Emmett-Teller(BET) surface area,the initial AgNO3 concentration,the ratio of aerogel mass/solution volume and value on adsorption properties were studied.The morphology of silver-containing carbon aerogels were investigated by means of scanning electron microscopy(SEM).The results showed that the mechanism of silver ions adsorption onto carbon aerogels is conducted by way of oxidation and reduction reaction.The adsorbent granule silver was distributed mainly on the surface of carbon aerogels,and adsorption capacity of silver was related to pore structure,the extent of activation,solution pH,the ratio of aerogel mass/solution volume,Ag+concentration and so on.The SEM figures showed that the state of silver adsorbed on the surface of carbon aerogels was various in the solution of different pH.
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