Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 280, Issue -, Pages -Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2020.111749
Keywords
Biochar; Surface modification; Adsorption; Sulfonamide; Kinetics
Categories
Funding
- National Natural Science Foundation of China [21177061]
- Natural Science Foundation of Jiangsu Province [BK20150968]
- Technology-Based Pioneering Enterprise Incubation Project of Jiangsu Province [BC2016003]
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The study synthesized HNO3-modified biochar from walnut shell and characterized it through various techniques, revealing carbon/oxygen-containing groups on its surface. It demonstrated a good adsorption capacity for three sulfonamide drugs, with adsorption being more favorable under weak acidic conditions. Interactions mainly involved pi-pi EDA, electrostatic interaction, Lewis acid-base interaction, hydrophobic interaction, and H-bond.
The novel HNO3-modifitied biochar (NBC) was synthesized from walnut shell. The NBC was characterized from scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectrum. The NBC was then used in the adsorption of sulfadiazine, sulfamethazine and sulfachloropyridazine from aqueous solution. The material surface has carbon/oxygen-contained groups, which is benefit for the adsorption. The results showed the adsorption ability of NBC on three sulfonamides were 32, 46, and 40 mg g(-1), respectively. The kinetic was found to follow the Elovich model and the isotherm conformed Freundlich. Adsorption was more favorable at weak acidic solution. The interactions mainly include pi-pi EDA, electrostatic interaction, Lewis acid-base interaction, hydrophobic interaction and H-bond.
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