Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4980751 | Process Safety and Environmental Protection | 2016 | 9 Pages |
Abstract
Low-cost activated carbon was produced from alligator weed by phosphoric acid activation. The cost of production of alligator weed-activated carbon (AWAC) was CNÂ¥ 2.1/kg and the content of activated carbon (AC) in AWAC was 35.33%. AWAC was used as an adsorbent to adsorb cephalexin (CEX) from aqueous solution. Scanning electron microscopy (SEM) analysis of AWAC revealed a highly porous structure with a rough surface. AWAC featured a high surface area of 736.3Â m2/g and an average pore size of 4.05Â nm, which were responsible for its excellent adsorption ability. The maximum CEX adsorption capacity of AWAC was â¼45Â mg/g. The Langmuir isotherm (R2Â =Â 0.9967) gave the best correlation with the experimental data at 308Â K, indicating monolayer adsorption. The kinetic model data on AWAC fit well to the pseudo-second-order kinetic equation, which is considered as the rate-limiting factor. Fourier transform infrared spectroscopy analysis revealed the presence of phosphorus-containing groups and C-H, C-O, and C=C moieties on the surface of AWAC. Following adsorption, the intensity of the spectral peaks of AWAC decreased owing to coverage of the CEX species or reaction with the functional groups of CEX.
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Authors
Ming-Sheng Miao, Qun Liu, Li Shu, Zhen Wang, Yu-Zhen Liu, Qiang Kong,