New chitosan-biochar composite derived from agricultural waste for removing sulfamethoxazole antibiotics in water

[Display omitted] •New chitosan-biochar composite derived from agricultural waste were fabricated.•Characteristics of biochar and chitosan-biochar composite were presented.•Affecting factors to the adsorption process were investigated.•Thermodynamic and adsorption isotherms were revealed and assesse...

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Bibliographic Details
Published in:Bioresource technology 2023-10, Vol.385, p.129384-129384, Article 129384
Main Authors: Son Tran, Van, Hao Ngo, Huu, Guo, Wenshan, Ha Nguyen, Thanh, Mai Ly Luong, Thi, Huan Nguyen, Xuan, Lan Anh Phan, Thi, Trong Le, Van, Phuong Nguyen, Minh, Khai Nguyen, Manh
Format: Article
Language:English
Subjects:
Adsorption
Agricultural by-product
Anti-Bacterial Agents
Antibiotic removal
Charcoal
Chitosan
Chitosan-biochar adsorbent
Cross-linking
Glutaraldehyde
Kinetics
Sulfamethoxazole
Water
Water Pollutants, Chemical - analysis
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Summary:[Display omitted] •New chitosan-biochar composite derived from agricultural waste were fabricated.•Characteristics of biochar and chitosan-biochar composite were presented.•Affecting factors to the adsorption process were investigated.•Thermodynamic and adsorption isotherms were revealed and assessed.•Uptake mechanism of SMX onto the adsorbent was proposed and discussed. This study aims to develop a new chitosan-biochar composite derived from agricultural waste for removing sulfamethoxazole (SMX) antibiotics in water. Biochar was prepared from orange peel (OB) and spent coffee grounds (SCB). To fabricate chitosan-biochar composites, chitosan and biochar were crosslinked with glutaraldehyde. Results showed that pH, adsorbent dosage, time, temperature, and initial concentrations have a significant impact on the SMX adsorption. The adsorption data was better described by Langmuir (with good regression) than Freundlich model. The highest adsorption capacity (Qmax) of SMX on OB, SCB, CTS-OB, and CTS-SCB were 3.49, 7.65, 7.24, and 14.73 mg/g, respectively. The Freundlich constant (KF) values for adsorption capacity were 1.66, 1.91, 2.57, and 5.57 (mg1-nLn/g), respectively, for OB, SCB, CTS-OB, and CTS-SCB. Ion exchange, π bonding, hydrogen bonding and pore filling, were proposed as dominant mechanisms of SMX removal process.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2023.129384