Coupling of kenaf Biochar and Magnetic BiFeO 3 onto Cross-Linked Chitosan for Enhancing Separation Performance and Cr(VI) Ions Removal Efficiency

Daixi Zhou, Guangyu Xie, Xinjiang Hu, Xiaoxi Cai, Yunlin Zhao, Xi Hu, Qi Jin, Xiaohua Fu, Xiaofei Tan, Chong Liang, Kaiqi Lai, Hui Wang and Chunfang Tang
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Daixi Zhou: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
Guangyu Xie: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
Xinjiang Hu: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
Xiaoxi Cai: College of Art and Design, Hunan First Normal University, Changsha 410205, China
Yunlin Zhao: Faculty of Life Science and Technology, Central South University of Forestry and Technology, Changsha 410004, China
Xi Hu: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
Qi Jin: Faculty of Life Science and Technology, Central South University of Forestry and Technology, Changsha 410004, China
Xiaohua Fu: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
Xiaofei Tan: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
Chong Liang: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
Kaiqi Lai: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
Hui Wang: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
Chunfang Tang: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China

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

Abstract: Cr(VI) contamination has posed great threat to both the ecosystem and human health for its carcinogenic and mutagenic nature. A highly effective adsorbent for the removal of Cr(VI) was prepared and its adsorption mechanism was thoroughly discussed in this study. In detail, magnetic BiFeO 3 and kenaf biochar were loaded on cross-linked chitosan to obtain chitosan- kenaf biochar@BiFeO 3 (CKB) for improving adsorption capacity towards Cr(VI). The adsorption process of Cr(VI) onto CKB was evaluated as a function of the pH, the existence of competing ions, the initial concentration of Cr(VI) and contact time. The results show that CKB exhibits the highest adsorption capacity under the optimal pH 2.0. The presence of competing ions such as Ca 2+ , NO 3 − , SO 4 2− , and Cl − decreases the adsorption capacity; among them, Ca 2+ and NO 3 − show the greatest hindrance. By studying the effect of initial Cr(VI) concentration on the adsorption capacity, it was found that CKB in the solution was enough to remove Cr(VI) for all treatments (10–200 mg/L). The adsorption experimental data were well fitted with pseudo-first-order model, suggesting that chemisorption is not the dominant rate-limiting step. Freundlich isotherm model can better explain the adsorption process, indicating a non-ideal adsorption towards Cr(VI) on a heterogeneous surface of CKB. A 2 5-1 Fractional Factorial Design (FFD) showed that pH and initial concentration of Cr(VI) have significant influence on Cr(VI) adsorption in our reaction system. In general, excellent adsorption efficiency of CKB indicates that it may be a good candidate for the remediation of Cr(VI)-contaminating wastewater.

Keywords: Magnetic biochar; Chitosan; Cr(VI) decontamination; Glutaraldehyde-crosslinking; Adsorption; Fractional factor design (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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