Removal of cephalexin from effluent by activated carbon prepared from alligator weed: Kinetics, isotherms, and thermodynamic analyses

Miao, M, Liu, Q, Shu, L, Wang, Z, Liu, Y and Kong, Q 2016, 'Removal of cephalexin from effluent by activated carbon prepared from alligator weed: Kinetics, isotherms, and thermodynamic analyses', Process Safety and Environmental Protection, vol. 104, pp. 481-489.


Document type: Journal Article
Collection: Journal Articles

Title Removal of cephalexin from effluent by activated carbon prepared from alligator weed: Kinetics, isotherms, and thermodynamic analyses
Author(s) Miao, M
Liu, Q
Shu, L
Wang, Z
Liu, Y
Kong, Q
Year 2016
Journal name Process Safety and Environmental Protection
Volume number 104
Start page 481
End page 489
Total pages 9
Publisher Elsevier Ltd
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 CN¥ 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 736.3 m 2 /g and an average pore size of 4.05 nm, which were responsible for its excellent adsorption ability. The maximum CEX adsorption capacity of AWAC was ∼45 mg/g. The Langmuir isotherm (R 2 = 0.9967) gave the best correlation with the experimental data at 308 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.
Subject Applied Mathematics not elsewhere classified
Keyword(s) Activated carbon
Adsorption
Alligator weed
Cephalexin
DOI - identifier 10.1016/j.psep.2016.03.017
Copyright notice © 2016 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
ISSN 0957-5820
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