Adsorption of Lead (II) from Aqueous Solution with High Efficiency by Hydrothermal Biochar Derived from Honey

Bo Wang, Jie Yu, Hui Liao, Wenkun Zhu, Pingping Ding and Jian Zhou
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Bo Wang: State Key Laboratory of Environment-Friendly Energy Materials, School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
Jie Yu: State Key Laboratory of Environment-Friendly Energy Materials, School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
Hui Liao: State Key Laboratory of Environment-Friendly Energy Materials, School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
Wenkun Zhu: State Key Laboratory of Environment-Friendly Energy Materials, School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
Pingping Ding: College of Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chengdu 610059, China
Jian Zhou: State Key Laboratory of Environment-Friendly Energy Materials, School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China

IJERPH, 2020, vol. 17, issue 10, 1-13

Abstract: A novel natural honey hydrothermal biochar (HHTB) was prepared using natural honey as raw material. The as-prepared adsorbent was applied to adsorb Pb 2+ from aqueous solution and characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy to investigate the structure and morphology change of the adsorbent before and after Pb 2+ adsorption. The influence of the pH, initial Pb 2+ concentration, temperature, and contact time on the adsorption of Pb 2+ was systematically investigated. The results revealed that the adsorption capacity for Pb 2+ is up to 133.2 mg·g −1 at initial pH of 5.0 and adsorption temperature of 298 K. Meanwhile, the adsorption of Pb 2+ on HHTB can be well fitted by the pseudo-second-order model and Langmuir isotherm model. The adsorbent had great selectivity for Pb 2+ from the aqueous solution containing coexisting ions including Cd 2+ , Co 2+ , Cr 3+ , Cu 2+ , Ni 2+ and Zn 2+ . Furthermore, the adsorption of Pb 2+ on HHTB was attributed to complexation coordination, where it involved hydroxyl and carboxylic groups on HHTB in the process of adsorption of Pb 2+ .

Keywords: honey; hydrothermal carbon; adsorption; water pollution; lead (II) (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
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