Adsorption of sulfanilamides using biochar derived from Suaeda salsa: adsorption kinetics, isotherm, thermodynamics, and mechanism

• DOI: 10.1007/s11356-023-27228-2
• Publication Date: 2023-05-06T02:01:27Z
• Authors: Yanrong Cai; Weili Jiang; Di Liu; Chun Chang
• Keywords: Kinetics; Sulfanilamide; Charcoal; Thermodynamics; Adsorption; Chenopodiaceae; Hydrogen-Ion Concentration; Water Pollutants, Chemical

Suaeda biochar (SBC) was prepared by muffle furnace with Suaeda salsa at 600, 700, 800, and 900 ℃. The physical and chemical properties of biochar at different pyrolysis temperatures and the adsorption mechanism of sulfanilamide (SM) were studied by SEM-EDS, BET, FTIR, XRD, and XPS analysis. The adsorption kinetics and adsorption isotherms were fitted. The results showed that the kinetics was in line with the quasi-second-order adsorption model and belonged to chemisorption. The adsorption isotherm conformed to Langmuir adsorption isotherm model and belonged to monolayer adsorption. The adsorption of SM on SBC was spontaneous and exothermic. The adsorption mechanism may be pore filling, hydrogen bonding, and π-π electron donor acceptor (EDA) interaction.