کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
581484 | 877844 | 2009 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
In situ modification of activated carbons developed from a native invasive wood on removal of trace toxic metals from wastewater
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
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![عکس صفحه اول مقاله: In situ modification of activated carbons developed from a native invasive wood on removal of trace toxic metals from wastewater In situ modification of activated carbons developed from a native invasive wood on removal of trace toxic metals from wastewater](/preview/png/581484.png)
چکیده انگلیسی
Activated carbons were developed by phosphoric acid activation of sawdust from Prosopis ruscifolia wood, an indigenous invasive species of degraded lands, at moderate conditions (acid/precursor ratio = 2, 450 °C, 0.5 h). For in situ modification of their characteristics, either a self-generated atmosphere or flowing air was used. The activated carbons developed in the self-generated atmosphere showed higher BET surface area (2281 m2/g) and total pore volume (1.7 cm3/g) than those obtained under flowing air (1638 m2/g and 1.3 cm3/g). Conversely, the latter possessed a higher total amount of surface acidic/polar oxygen groups (2.2 meq/g) than the former (1.5 meq/g). To evaluate their metal sorption capability, adsorption isotherms of Cu(II) ion from model solutions were determined and properly described by the Langmuir model. Maximum sorption capacity (Xm) for the air-derived carbons (Xm = 0.44 mmol/g) almost duplicated the value for those obtained in the self-generated atmosphere (Xm = 0.24 mmol/g), pointing to a predominant effect of the surface functionalities on metal sequestering behaviour. The air-derived carbons also demonstrated a superior effectiveness in removing Cd(II) ions as determined from additional assays in equilibrium conditions. Accordingly, effective phosphoric acid-activated carbons from Prosopis wood for toxic metals removal from wastewater may be developed by in situ modification of their characteristics operating under flowing air.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 161, Issue 1, 15 January 2009, Pages 217-223
Journal: Journal of Hazardous Materials - Volume 161, Issue 1, 15 January 2009, Pages 217-223
نویسندگان
J. de Celis, N.E. Amadeo, A.L. Cukierman,