A novel Biochar modified by Chitosan-Fe/S for tetracycline adsorption and studies on site energy distribution

Juanli Liu; Baiqin Zhou; Hong Zhang; Juan Ma; Bin Mu; Wenbo Zhang

doi:10.1016/j.biortech.2019.122152

A novel Biochar modified by Chitosan-Fe/S for tetracycline adsorption and studies on site energy distribution

Bioresour Technol. 2019 Dec:294:122152. doi: 10.1016/j.biortech.2019.122152. Epub 2019 Sep 16.

Authors

Juanli Liu¹, Baiqin Zhou², Hong Zhang³, Juan Ma², Bin Mu⁴, Wenbo Zhang⁵

Affiliations

¹ School of Chemical Engineering, Key Laboratory for Utility of Environmental Friendly Composite Materials and Biomass in University of Gansu Province, Northwest Minzu University, Lanzhou 730030, China; Key Laboratory of Clay Mineral in Gansu Province, Lanzhou 730000, China.
² School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China.
³ School of Chemical Engineering, Key Laboratory for Utility of Environmental Friendly Composite Materials and Biomass in University of Gansu Province, Northwest Minzu University, Lanzhou 730030, China.
⁴ Key Laboratory of Clay Mineral in Gansu Province, Lanzhou 730000, China.
⁵ School of Chemical Engineering, Key Laboratory for Utility of Environmental Friendly Composite Materials and Biomass in University of Gansu Province, Northwest Minzu University, Lanzhou 730030, China; Key Laboratory of Clay Mineral in Gansu Province, Lanzhou 730000, China. Electronic address: hgxy8080@126.com.

PMID: 31557651
DOI: 10.1016/j.biortech.2019.122152

Abstract

A novel wasted sludge-based Biochar modified by Chitosan and Fe/S (BCFe/S) was prepared for tetracycline (TC) removal from water. To investigate the similarities and differences in adsorption behaviors between Biochar and BCFe/S, characterization, kinetics, isotherms and thermodynamics were discussed. The studies on site energy distribution (SED) were also presented. The results showed that the maximum TC adsorption amount was 51.78 mg/g for Biochar, while it was 183.01 mg/g for BCFe/S-4. Meanwhile, electrostatic attraction, π-π stacking, pore filling, silicate bonding and hydrogen bonding were the main adsorption mechanisms for TC removal by Biochar. Besides above mechanisms, chelating and ion exchange were also accounted for adsorption mechanisms for TC uptake by BCFe/S-4. Moreover, SED results revealed that the surface of Biochar was more homogeneous while the surface of BCFe/S-4 was more heterogeneous at higher temperature. Findings of this work could offer valuable information in designing adsorbents and investigating adsorption mechanisms.

Keywords: Adsorption mechanisms; Chitosan-Fe/S modification; Comparison; Site energy distribution; Tetracycline adsorption.

MeSH terms

Adsorption
Charcoal
Chitosan*
Kinetics
Tetracycline
Water Pollutants, Chemical*

Substances

Water Pollutants, Chemical
biochar
Charcoal
Chitosan
Tetracycline