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Open AccessArticle

Sorption of Sulfamethoxazole on Inorganic Acid Solution-Etched Biochar Derived from Alfalfa

1
College of Urban and Environmental Sciences, Northwest University, Xi’an 710127, China
2
Ningdong Forestry Bureau of Shaanxi Province, Xi’an 710127, China
*
Author to whom correspondence should be addressed.
Academic Editor: Kamila Sadowska
Materials 2021, 14(4), 1033; https://doi.org/10.3390/ma14041033
Received: 12 January 2021 / Revised: 11 February 2021 / Accepted: 17 February 2021 / Published: 22 February 2021
The properties of alfalfa-derived biochars etched with phosphoric (PBC) or hydrochloric acid (ClBC) compared with raw materials (BC) were examine in this paper. SEM, FT-IR, XRD, BET and elemental analysis were performed to characterize the micromorphology and chemical structure comprehensibly. The results showed that the porous structure was enhanced, and surface area was increased via etching with inorganic acids. Batch adsorption experiments were performed for sulfamethoxazole (SMX) to biochars. The experimental data showed that modified biochars exhibited higher adsorption capacity for SMX, i.e., the adsorption quantity of ClBC and PBC had risen by 38% and 46%. The impact on pH values suggested that the physisorption, including pore-filling and electrostatic interaction, might be applied to original biochar. In addition, chemisorption also played a role, including hydrogen bonding, π-π electron donor acceptor interaction (π-π EDA), and so on. Furthermore, both pH and coexisting ions also had a certain effect on sorption. Enhancement of the electrostatic attraction between biochar and SMX might also account for the enhanced capacity of SMX at pH < 7, and coexisting ions could decrease the amount of SMX adsorbed onto biochars, mainly because of competition for adsorption sites. View Full-Text
Keywords: biochar; etch; sulfamethoxazole; adsorption; mechanism biochar; etch; sulfamethoxazole; adsorption; mechanism
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MDPI and ACS Style

Li, Q.; Yu, W.; Guo, L.; Wang, Y.; Zhao, S.; Zhou, L.; Jiang, X. Sorption of Sulfamethoxazole on Inorganic Acid Solution-Etched Biochar Derived from Alfalfa. Materials 2021, 14, 1033. https://doi.org/10.3390/ma14041033

AMA Style

Li Q, Yu W, Guo L, Wang Y, Zhao S, Zhou L, Jiang X. Sorption of Sulfamethoxazole on Inorganic Acid Solution-Etched Biochar Derived from Alfalfa. Materials. 2021; 14(4):1033. https://doi.org/10.3390/ma14041033

Chicago/Turabian Style

Li, Qi; Yu, Wei; Guo, Linwen; Wang, Yuhang; Zhao, Siyu; Zhou, Li; Jiang, Xiaohui. 2021. "Sorption of Sulfamethoxazole on Inorganic Acid Solution-Etched Biochar Derived from Alfalfa" Materials 14, no. 4: 1033. https://doi.org/10.3390/ma14041033

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