Journal
BIORESOURCE TECHNOLOGY
Volume 238, Issue -, Pages 484-491Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.04.081
Keywords
Cephalosporin residue; Biochar and activated carbon; Hexavalent chromium; Adsorption and reduction; Behavior and mechanism
Funding
- Shandong Provincial Natural Science Foundation, China [ZR2016EEM33]
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Cephalosporin residue (CR) was used to produce biochar (BC) and activated carbon (AC) at 600 degrees C (BC600 and AC600). To compare the removal behaviors and mechanisms of Cr(VI) by CR and derived chars, batch adsorption tests were performed in Cr(VI) microenvironment like pH, Cr(VI) concentration, adsorbent dosage, combing with the characterization of adsorbents before and after adsorption. Fourier transform-infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), and Brunauer-Emmett-Teller (BET) techniques were used. Results showed that the Cr(VI) removals by CR and CR-chars fitted Freundlich and Langmuir models. Based on the Langmuir model, the maximum adsorption capacities of CR, BC600 and AC600 towards Cr(VI) were 107.41, 88.19 and 74.07 mg g(-1), respectively. The CR rich in dissolved carbon (DOC), -NH2 and -COOH, chiefly acted as chelating and reducing agents, while the AC600 with high surface area mainly supported Cr(VI) adsorption during Cr(VI) removal process. (C) 2017 Elsevier Ltd. All rights reserved.
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