【摘要】 研究了配位体和氧化改性对活性炭吸附Ag+及其配合物的影响以及银在活性炭表面的分布特征。结果表明:(1)活性炭对Ag+ 的吸附非常快,且不受离子强度的影响。但当Ag+ 形成 [Ag(NH3)2]+ 和 [Ag(S2O3)2]3-后在活性炭上吸附性能下降,氨水浓度增加对[Ag(NH3)2]+的吸附没有影响,而还原性的Na2S2O3浓度增加使[Ag(S2O3)2]3-的吸附下降。(2)银主要分布在活性炭的外表面,Ag+浓度和吸附时间不同将导致银颗粒的分布及粒径也不同。合理控制Ag+浓度和吸附时间,就可以在活性炭表面负载纳米金属银。(3)活性炭氧化改性不利于Ag+和[Ag(S2O3)2]3-的吸附,却有利于[Ag(NH3)2]+的吸附。更多还原

【Abstract】 The effect of ion intensity and ligand on adsorption of Ag+ on activated carbon was discussed, and the research on the characteristic of distributing of silver on activated carbon was made on., At last the change of adsorption of Ag+ and its coordination compound on oxidized activated carbon was also studied. The study result showed: (1)The adsorption of Ag+ on activated carbon is very swift and not influenced by ion intensity in solution, but it will decline when Ag+ forms [Ag(NH3)2]+ and [Ag(S2O3)2]3-.The increase of concentration of NH3H2O has no effect on adsorption of Ag+ and yet the increase of concentration of Na2S2O3 with deoxidization will make against it. (2) The results observed by SEM showed the distributing of silver is mainly outside, and very little in the tiny hole. The difference of concentration of Ag+ and the adsorption time will result in different distributing of silver. By controlling adsorption condition, metallic silver in nano-size will form on activated carbon. (3) Oxidized activated carbon makes against adsorption of Ag+ and [Ag(S2O3)2]3-, but makes for adsorption of [Ag(NH3)2]+.更多还原