Preparation and Characterization of Fe-Mn Binary Oxide/Mulberry Stem Biochar Composite Adsorbent and Adsorption of Cr(VI) from Aqueous Solution

Meina Liang, Shuiping Xu, Yinian Zhu, Xu Chen, Zhenliang Deng, Liling Yan and Huijun He
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Meina Liang: College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China
Shuiping Xu: College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China
Yinian Zhu: College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China
Xu Chen: College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China
Zhenliang Deng: College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China
Liling Yan: College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China
Huijun He: College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China

IJERPH, 2020, vol. 17, issue 3, 1-16

Abstract: This study details the preparation of Fe-Mn binary oxide/mulberry stem biochar composite adsorbent (FM-MBC) from mulberry stems via the multiple activation by potassium permanganate, ferrous chloride, triethylenetetramine, and epichlorohydrin. The characteristics of FM-MBC had been characterized by SEM-EDS, BET, FT-IR, XRD, and XPS, and static adsorption batch experiments such as pH, adsorption time, were carried out to study the mechanism of Cr(VI) adsorption on FM-MBC and the impact factors. The results indicated that in contrast with the mulberry stem biochar (MBC), the FM-MBC has more porous on surface with a BET surface area of 74.73 m 2 /g, and the surface loaded with α-Fe 2 O 3 and amorphization of MnO 2 particles. Besides, carboxylic acid, hydroxyl, and carbonyls functional groups were also formed on the FM-MBC surface. At the optimal pH 2.0, the maximum adsorption capacity for Cr(VI) was calculated from the Langmuir model of 28.31, 31.02, and 37.14 mg/g at 25, 35, and 45 °C, respectively. The aromatic groups, carboxyls, and the hydroxyl groups were the mainly functional groups in the adsorption of Cr(VI). The mechanism of the adsorption process of FM-MBC for Cr(VI) mainly involves electrostatic interaction, surface adsorption of Cr(VI) on FM-MBC, and ion exchange.

Keywords: mulberry stem; bio-charcoal; adsorption; Fe-Mn binary oxide; chromium (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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