Document Details
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Document Type |
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Article In Journal |
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Document Title |
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Adsorption of pharmaceutical pollutants onto graphene nanoplatelets إدمصاص الملوثات الصيدلانية على صفائح جراقين متناهية الدقة |
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Subject |
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Enviromental sciences |
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Document Language |
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English |
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Abstract |
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This study explores the removal of aspirin (ASA), acetaminophen (APAP), and caffeine (CAF); as examples of hazardous pharmaceutical pollutants, from aqueous solution by graphene nanoplatelets (GNPs). Char-acterization of the GNPs showed a transparent, layered structure with a smooth surface and many wrin-kles, as well as a specific surface area of 635.2 m2 g1. The effects of adsorption time, GNPs mass, solution pH, ionic strength, and temperature were studied and optimized. The effect of temperature on the adsorption kinetics was investigated using pseudo-first-order, pseudo-second-order kinetic models, and the experimental data were fitted well to the pseudo-second-order kinetic model. Also, the adsorp-tion mechanism was explored using intra-particle diffusion and liquid film diffusion models, and the results revealed that none of these models was the rate-determining steps. The adsorption was studied thermodynamically, and the Gibbs free energy change (DG), enthalpy change (DH), and entropy change (DS), were calculated. The DG values were negative at all temperatures indicating the spontaneity of the adsorption of ASA, APAP, and CAF by GNPs from aqueous solution. GNPs showed great efficiency when they were used for the removal of ASA, APAP, and CAF from real environmental samples. |
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ISSN |
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1385-8947 |
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Journal Name |
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Chemical Engineering Journal |
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Volume |
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248 |
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Issue Number |
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1 |
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Publishing Year |
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1435 AH
2014 AD |
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Article Type |
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Article |
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Added Date |
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Monday, August 4, 2014 |
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Researchers
| Lateefa A. Al-Khateeb | Al-Khateeb, Lateefa A. | Researcher | | |
| Sitah Almotiry | Almotiry, Sitah | Researcher | | |
| Mohamad Abdel Salam | Salam, Mohamad Abdel | Researcher | | masalam16@hotmail.com |
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