Two-step pyrolysis biochar derived from agro-waste for antibiotics removal: Mechanisms and stability

This study used acetone washing biochar (BCA) and nitric-acid washing biochar (BCN) derived from bagasse to remove sulfamethoxazole (SMX) and tetracycline (TC) in water. Higher specific surface area (1119.53 m2 g−1) and graphitization degree can significantly improve decontamination efficacy, of whi...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2022-04, Vol.292, p.133454-133454, Article 133454
Main Authors: Wang, Weitong, Kang, Rui, Yin, Yingwu, Tu, Song, Ye, Liyi
Format: Article
Language:English
Subjects:
acetone
Adsorption
Anti-Bacterial Agents
bagasse
Bagasse biochar
biochar
Charcoal
decontamination
Ion interference
Kinetics
nitric acid
organic matter
Pyrolysis
Real-water application
Sulfamethoxazole
surface area
Tetracycline
wastes
Water Pollutants, Chemical - analysis
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Summary:This study used acetone washing biochar (BCA) and nitric-acid washing biochar (BCN) derived from bagasse to remove sulfamethoxazole (SMX) and tetracycline (TC) in water. Higher specific surface area (1119.53 m2 g−1) and graphitization degree can significantly improve decontamination efficacy, of which BCN has the highest SMX and TC sorption capacities (274.63 mg g−1 and 353.85 mg g−1). The kinetics, isotherms and characterization analysis indicated O-containing functional group complexation and π-π interaction were dominant mechanisms in the adsorption process. Adsorption stability experiment showed that BCA has better stability with the coexistence of anions and cations. Besides, the enhancement and competitive adsorption from the interaction between soluble organic matter and TC could facilitate TC decontamination. Therefore, bagasse biochar derived from agro-waste has a promising potential for antibiotic contaminants removal from multi-interference conditions and promotes the recycling of waste, thereby achieving harmony between materials and the ecological environment. [Display omitted] •Acetone washing biochar (BCA) and nitric-acid washing biochar (BCN) were prepared.•Biochar with a porous structure becomes more graphitized as temperature rises.•BCA and BCN exhibits superior adsorption capacities for SMX and TC.•Main mechanisms for antibiotics include complexation and π-π interaction.•Biochar shows high stability in multiple intricate environments.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2021.133454