Effective removal of doxycycline from aqueous solution using CuO nanoparticles decorated poly(2-acrylamido-2-methyl-1-propanesulfonic acid)/chitosan

• Published in: Environmental science and pollution research international 2021-08, Vol.28 (32), p.43599-43617
• Main Authors: Rahman, Nafisur, Varshney, Poornima
• Format: Article
• Language: English
• Subjects: Adsorbents; Adsorption; Antibiotics; Aquatic Pollution; Aqueous solutions; Atmospheric Protection/Air Quality Control/Air Pollution; Chitosan; Composite materials; Copper; Copper oxides; Differential thermal analysis; Differential thermogravimetric analysis; Dosage; Doxycycline; Earth and Environmental Science; Ecotoxicology; Endothermic reactions; Environment; Environmental Chemistry; Environmental Health; Environmental science; Fourier analysis; Fourier transforms; Hydrogen-Ion Concentration; Infrared spectroscopy; Kinetics; Nanoparticles; Optimization; pH effects; Polymers; Process variables; Research Article; Response surface methodology; Scanning electron microscopy; Spectroscopy, Fourier Transform Infrared; Spectrum analysis; Sulfonic Acids; Thermal analysis; Thermodynamics; Thermogravimetric analysis; Waste Water Technology; Water; Water Management; Water Pollutants, Chemical; Water Pollution Control; X-ray diffraction; X-ray spectroscopy
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-021-13584-4

The primary focus of the present study was to synthesize CuO nanoparticles decorated poly(2-acrylamido-2-methyl-1-propanesulfonic acid)/chitosan to explore its potential for uptake of doxycycline (DXN) from water. The composite material was characterized using Fourier transform infrared spectroscopy, scanning electron microscopy with energy dispersive X-ray spectroscopy, X-ray diffraction and thermogravimetric analysis-differential thermal analysis. Central composite design under response surface methodology was opted to optimize the process variables (pH, adsorbent dosage, contact time and initial concentration of DXN) for obtaining the highest removal efficiency. The removal of DXN reached 98.84% at 303 K under the optimum conditions of pH 7.0, equilibrating time of 70 min, adsorbent dose of 20 mg/25 mL and initial concentration of 50 mg L −1 . The Langmuir isotherm and pseudo-second-order kinetic models fitted best with the experimental data. The values of ΔG° (− 29.159 to − 31.997 kJ mol −1 ), ΔH° (56.768 kJ mol −1 ) and ΔS° (283.382 J mol −1 K −1 ) demonstrated the spontaneous and endothermic nature of adsorption process. The adsorption/desorption study revealed the reusability of the prepared composite material for DXN uptake up to six cycles.