Removal of Cefdinir from Aqueous Solution Using Nanostructure Adsorbents of Ti[O.sub.2], Si[O.sub.2] and Ti[O.sub.2]/Si[O.sub.2]: Equilibrium, Thermodynamic and Kinetic Studies

• Published in: Chemical and biochemical engineering quarterly Vol. 33; no. 2; p. 235
• Main Author: Yener, H. Banu
• Format: Journal Article
• Language: English
• Published: Croatian Association of Chemical Engineers 01.04.2019
• Subjects: Adsorption; Antibiotics; Cefdinir; Thermal properties; Thermodynamics
• ISSN: 0352-9568
• DOI: 10.15255/CABEQ.2019.1632

The adsorptive removal of cefdinir, an antibiotic, from aqueous solutions on Ti[O.sub.2], Si[O.sub.2] and Ti[O.sub.2]/Si[O.sub.2] nanostructures was studied by batch experiments. The Si[O.sub.2] particles were obtained from rice husk ash. Investigated were the effects of the solution pH, adsorbent dosage, initial adsorbate concentration, and solution temperature on both cefdinir uptake and removal. The studies suggest that the adsorption of cefdinir on the nanostructures was mainly due to the electrostatic interaction between the ionic adsorbate molecules and charged adsorbent surface sites. The adsorption isotherm data of Ti[O.sub.2] and Si[O.sub.2] fit well to the Langmuir isotherm model and the Freundlich model for Ti[O.sub.2]/Si[O.sub.2]. The thermodynamic studies indicated favorable and spontaneous occurrence of adsorption. The kinetic data of Ti[O.sub.2] fitted best with PSO reaction model equation, and was described well by Weber-Morris diffusion model with dominating control mechanism of intraparticle diffusion and limited contribution of internal film diffusion. Keywords: Ti[O.sub.2], Si[O.sub.2], Ti[O.sub.2]/Si[O.sub.2], adsorption, cefdinir, rice husk ash