Efficient removal of veterinary drugs from aqueous solutions using magnetically separable carbonaceous materials derived from cobalt and iron metal-organic frameworks

• Published in: Environmental science and pollution research international 2023-07, Vol.30 (32), p.78973-78987
• Main Authors: Salazar-García, Andrea, Montemayor, Sagrario M., Guzmán-Mar, Jorge Luis, Puente-Urbina, Bertha A., Hurtado-López, Gilberto F., Hinojosa-Reyes, Laura
• Format: Article
• Language: English
• Subjects: Adsorption; Aquatic Pollution; Aqueous solutions; Atmospheric Protection/Air Quality Control/Air Pollution; Carbon; Carbonaceous materials; Chemical composition; Cobalt; Cobalt oxides; Drugs; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Environmental science; Ferric oxide; Flumequine; Influenza; Iron oxides; Magnetic materials; Magnetic properties; Magnetic saturation; Metal-organic frameworks; Pollutants; Raman spectra; Raman spectroscopy; Regression coefficients; Regression models; Research Article; Sulfadiazine; Surface chemistry; Surface properties; Veterinary medicine; Waste Water Technology; Water Management; Water Pollution Control
• ISSN: 1614-7499; 0944-1344; 1614-7499
• DOI: 10.1007/s11356-023-27939-6

Rapid synthesis of carbon-based magnetic materials derived from cobalt and iron metal-organic frameworks (MOFs), ZIF-67, and MIL-100(Fe), by microwave-assisted method, followed by carbonization under a N 2 atmosphere is described in this study. The carbon-derived MOFs (CDMs) were evaluated for the removal of the emerging pollutants sulfadiazine (SDZ) and flumequine (FLU) used as veterinary drugs. The study aimed to link the adsorption behavior with their surface properties and elemental composition. C-ZIF-67 and C-MIL-100(Fe) showed hierarchical porous structures with specific surface areas of 295.6 and 163.4 m 2 g −1 , respectively. The Raman spectra of the CDMs show the characteristic D and G bands associated with defect-rich carbon and sp 2 graphitic carbon, respectively. The CDMs exhibit cobalt species (Co 3 O 4 , CoO, and Co) in C-ZIF-67 and iron species (Fe 2 O 3 , Fe 3 O 4 , and Fe) in C-MIL-100 (Fe) which are related to the magnetic behavior of CDMs. C-ZIF-67 and C-MIL-100 (Fe) had saturation magnetization values of 22.9 and 53.7 emu g −1 , respectively, allowing easy solid-liquid separation using a magnet. SDZ and FLU removal rates on CDMs follow pseudo-second-order kinetics, and adsorption isotherms fit the Langmuir model based on regression coefficient values. Adsorption thermodynamics calculations showed that the adsorption of SDZ and FLU by CDMs was a thermodynamically favorable process. Therefore, these properties of C-ZIF-67 and C-MIL-100 (Fe) and their regeneration ability facilitate their use as adsorbents for emerging pollutants.