Ecofriendly magnetic gels beads based on carboxymethylcellulose and iron oxides for diclofenac adsorption

• DOI: 10.1007/s43938-024-00060-x
• Publication Date: 2024-08-08T12:02:20Z
• Authors: Yulianis P. Barra...; Vera A. Alvarez; Pedro Mendoza Zélis; Jimena S. Gonzalez
• Keywords: Diclofenac

This work presents the development of eco-friendly ferrogel beads that can effectively remove emerging pollutant diclofenac (DFC) from wastewater. These are composed natural polysaccharide/iron oxide. The structure and properties were studied using various techniques. Scanning electron microscopy images revealed porosity nature hydrogel due to incorporation magnetic nanoparticles (MNPs). TEM indicates diameter size MNPs around 8.3 ± 2 nm. addition resulted in enhanced visible MNP agglomerates. Fourier-transform infrared spectroscopy confirmed interactions between polymer (carboxymethyl cellulose, CMC) iron oxide nanoparticles, as indicated by characteristic peaks associated with both compounds. X-ray diffraction patterns had a crystalline (appears at 35.6°, 43.3° 53.7° corresponding (3 1 1), (4 0 0), 2)) while CMC exhibited an amorphous structure. behavior fresh dried was compared, revealing drying increased crosslinking, particularly presence MNPs. led reduction swelling percentage ferrogels (154% 23 °C water) when compared hydrogels (581% water). Magnetic analysis vibrating sample magnetometer demonstrated Langevin-type response for NMPs dispersions, they showed no coercivity, saturation magnetization 47(3) emu/g, case beads, is 3.8(2) indicating proportion 8% p/p relative beads. Adsorption studies DCF slowly adsorbed into after 500 min, reaching 50% lowest DFC concentration (10 mg/L), 75% 20 mg/L, 83% 30 mg/L 30% highest solution (2000 kinetics adsorption onto followed pseudo-second-order intraparticle diffusion model, physical chemical controlling factor. isotherm provided insights mechanism capacity, which crucial optimizing adsorbent performance. It found Temkin shows better fit. Overall, these findings suggest have great potential environmental applications removal their high capacity (qe = 666.7 mg/g), sustainability through reusability, promising recovery post-adsorption capabilities.