Sorption characteristics and mechanism of oxytetracycline in water by modified biochar derived from chestnut shell
YU Jian1, DING Heng1, ZHANG Zhi-lin1, LI Yan1,2, DING Lei1,2
1. School of Civil Engineering and Architecture, Anhui University of Technology, Ma¢anshan 243032, China; 2. Engineering Research Center of Biofilm Water Purification and Utilization Technology, Ministry of Education, Maxanshan, 243032, China
Abstract：The modified biochar (MBC) was prepared via one-step method of carbonization-activation pyrolysis, using chestnut shell as raw material and potassium acetate as the activator. The surface morphology, pore size distribution, functional groups and other surface properties of MBC were characterized, and its adsorption behavior on oxytetracycline hydrochloride (OTC) in water was also studied. Compared to the pyrolysis biochar (BC), MBC possessed a higher specific surface area of 1147.80m2/g, a richer pore structure, more oxygen-containing functional groups and stronger hydrophilicity. The MBC exhibited a high adsorption capacity of 165mg/g in solution pH ranging 3.0~8.0. The pseudo-second-order kinetic model and the Langmuir model can well describe the adsorption behavior of MBC on OTC. Thermodynamic analysis showed that the adsorption of OTC by MBC was a spontaneous endothermic process. In addition to hydrogen bonding, π-π bond accumulation and cation-π bonding, pore-filling was a dominant mechanism for OTC adsorption. The saturated MBC could be effectively regenerated by 0.5mol/L sodium hydroxide solution. Therefore, MBC has a good potential as an efficient adsorbent to remove OTC from water and wastewater.
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