Adsorption of tetracycline in aqueous solution by biochar derived from waste Auricularia auricula dregs

• Published in: Chemosphere (Oxford) Vol. 238; p. 124432
• Main Authors: Dai, Yingjie, Li, Jingjing, Shan, Dexin
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.01.2020
• Subjects: Adsorption; Antibiotic; Basidiomycota; Carbon; Charcoal - chemistry; Food Industry; Hot Temperature; Hydrogen-Ion Concentration; Industrial Waste; Kinetics; Solutions; Sorptive removal; Tetracycline - chemistry; Tetracycline - isolation & purification; Water - chemistry; Water Pollutants, Chemical - chemistry; Water Pollutants, Chemical - isolation & purification; Water pollution; Antibiotic; Water pollution; Carbon; Sorptive removal
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2019.124432

This study investigated the adsorption of tetracycline (TC) on biochar (BC) derived from waste Auricularia auricula dregs obtained at different pyrolysis temperatures. The characterization of BC and batch experiment results showed that BC prepared at a higher temperature was more suitable for removing TC, where the maximum adsorption capacities of BC samples prepared at 300 °C, 500 °C, and 700 °C were 7.22 mg/g, 9.90 mg/g, and 11.90 mg/g, respectively. A pseudo-first order kinetics model and Freundlich, Temkin, and Dubinin–Radushkevich isotherm models fitted well to the adsorption data. Liquid film diffusion was the rate-controlling step. In addition, π–π electron donor–acceptor interactions may have played a dominant role in the adsorption mechanism between the enone structure of TC and aromatic C of BC. These results may facilitate further investigations of the adsorption mechanism and optimization of the process. •The adsorptive ability of tetracycline (TC) on biochars (BC) were investigated.•The adsorption isotherms of TC on BC-700 were compared with BC-300 and BC-500.•Mechanisms were explained for TC adsorption.•The BC is a low–cost and environmentally friendly adsorbent for removal of TC.