Optimization, Kinetics, Thermodynamic and Arrhenius Model of the Removal of Ciprofloxacin by Internal Electrolysis with Fe-Cu and Fe-C Materials

• Published in: Processes 2021-12, Vol.9 (12), p.2110
• Main Authors: Do, Tra Huong, Ha, Xuan Linh, Duong, Thi Tu Anh, Nguyen, Phuong Chi, Hoang, Ngoc Bich, Tran, Thi Kim Ngan
• Format: Article
• Language: English
• Subjects: Adsorption; Antibiotics; Aqueous solutions; Ciprofloxacin; Composite materials; Drug resistance; Efficiency; Electrolysis; Electrolytes; Entropy; Iron; Kinetics; Optimization; Oxidation; pH effects; Pollutants; Shaking; Spectrum analysis
• ISSN: 2227-9717; 2227-9717
• DOI: 10.3390/pr9122110

The ciprofloxacin (CIP) removal ability of a Fe-Cu electrolytic material was examined with respect to pH (2–9), time (15–150 min), shaking speed (100–250 rpm), material mass (0.2–3 g/L), temperature (298, 308, 323) and initial CIP concentration (30–200 mg/L). The Fe-Cu electrolytic materials were fabricated by the chemical plating method, and Fe-C materials were mechanically mixed from iron powder and graphite. The results show that at a pH value of 3, shaking time 120 min, shaking speed 250 rpm, a mass of Fe-Cu, Fe-C material of 2 g/L and initial CIP concentration of 203.79 mg/L, the CIP removal efficiency of Fe-Cu material reached 90.25% and that of Fe-C material was 85.12%. The removal of CIP on Fe-Cu and Fe-C materials follows pseudo-first-order kinetics. The activation energy of CIP removal of Fe-Cu material is 14.93 KJ/mol and of Fe-C material is 16.87 KJ/mol. The positive ΔH proves that CIP removal is endothermic. A negative entropy of 0.239 kJ/mol and 0.235 kJ/mol (which is near zero and is also relatively positive) indicated the rapid removal of the CIP molecules into the removed products.