کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5366767 | 1388354 | 2007 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Influence of activated carbon surface acidity on adsorption of heavy metal ions and aromatics from aqueous solution Influence of activated carbon surface acidity on adsorption of heavy metal ions and aromatics from aqueous solution](/preview/png/5366767.png)
Adsorption of toxic heavy metal ions and aromatic compounds onto activated carbons of various amount of surface C-O complexes were examined to study the optimum surface conditions for adsorption in aqueous phase. Cadmium(II) and zinc(II) were used as heavy metal ions, and phenol and nitrobenzene as aromatic compounds, respectively. Activated carbon was de-ashed followed by oxidation with nitric acid, and then it was stepwise out-gassed in helium flow up to 1273Â K to gradually remove C-O complexes introduced by the oxidation. The oxidized activated carbon exhibited superior adsorption for heavy metal ions but poor performance for aromatic compounds. Both heavy metal ions and aromatics can be removed to much extent by the out-gassed activated carbon at 1273Â K. Removing C-O complexes, the adsorption mechanisms would be switched from ion exchange to CÏ-cation interaction for the heavy metals adsorption, and from some kind of oxygen-aromatics interaction to Ï-Ï dispersion for the aromatics.
Journal: Applied Surface Science - Volume 253, Issue 20, 15 August 2007, Pages 8554-8559