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DOI: https://doi.org/10.4491/eer.2018.358
Engineered biochar from pine wood: Characterization and potential application for removal of sulfamethoxazole in water
Hyun Min Jang1, Seunghyun Yoo2, Sunkyu Park2, and Eunsung Kan1,3
1Department of Agricultural and Biological Engineering & Texas A&M AgriLife Research Center at Stephenville, Texas A&M University, College Station, USA
2Department of Forest Biomaterials, North Carolina State University, Raleigh, USA
3Department of Wildlife, Sustainability, and Ecosystem Sciences, Tarleton State University, Stephenville, USA
Corresponding Author: Eunsung Kan ,Tel: +1-254-968-4144, Fax: +1-254-968-3759, Email: eunsung.kan@ag.tamu.edu
Received: October 10, 2018;  Accepted: December 1, 2018.
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ABSTRACT
The adsorption of sulfamethoxazole onto a NaOH-activated pine wood-derived biochar was investigated via batch experiments and models. Surprisingly, the maximum adsorption capacity of activated biochar for sulfamethoxazole (397.29 mg/g) was superior than those of pristine biochars from various feedstock, but comparable to those of commercially available activated carbons. Elovich kinetic and Freundlich isotherm models revealed the best fitted ones for the adsorption of sulfamethoxazole onto the activated biochar indicating chemisorptive interaction occurred on surface of the activated biochar. In addition, the intraparticle diffusion limitation was thought to be the major barrier for the adsorption of sulfamethoxazole on the activated biochar. The main mechanisms for the activated biochar would include hydrophobic, π-π interactions and hydrogen bonding. This was consistent with the changes in physicochemical properties of the activated biochar (e.g., increase in sp2 and surface area, but decrease in the ratios of O/C and H/C).
Keywords: Activated biochar | Antibiotics | Sulfamethoxazole | Water treatment | π-π interaction
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