Abstract
The main objective of the present study is to determine the kinetics, thermodynamics, and adsorption mechanism of the oxytetracycline (OTC) on rice husk ash (RHA). The adsorbent was characterized by scanning electronic microscopy, Fourier transform infrared spectroscopy, and nitrogen physisorption. Batch studies were carried out to evaluate the influence of the adsorbent dose, initial concentration, contact time, temperature, and initial pH. RHA was characterized as having heterogeneous, fibrous, and porous particles, consisting predominantly of silica. The removal of OTC depends on the pH of the medium, which is favored at acid pH values. The kinetic data followed the Bangham model, which indicated an OTC diffusion in the pores of RHA, although this was not the only process, as demonstrated through the use of the Weber-Morris model (IPD model). The Sips isotherm best represents the experimental results of the equilibrium study. It was found that the adsorption process was spontaneous and endothermic. The highest adsorption capacity was found at a pH in the range of 4–6, when the OTC is in its zwitterion form and the surface of the RHA is positively charged, thus permitting electrostatic interactions and the formation of hydrogen bonds between the adsorbent and adsorbate molecules. These findings demonstrate the potential of rice husk ash to remove oxytetracycline from water.
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Acknowledgments
The authors would like to thank the Laboratório de Engenharia e Processos Ambientais (LEPA), Laboratório de Engenharia Ambiental (LEA), Centro de Tecnologías Estratégicas do Nordeste (CETENE), and Laboratory of the Centro de Materiais da Universidade do Porto (CEMUP) for their help in the adsorbent characterization and the Scanning Electron Microscopy and X-ray microanalyses and to the company Espectrocrom, especially to the Engineer Edmundo Regalado by his unconditional support.
Funding
The authors would like to acknowledge the Secretaría de Nacional de Educación Superior, Ciencia y Tecnología del Ecuador (SENESCYT), and Universidad Técnica de Manabí for the financial support granted for this work.
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Andrade, C.A., Zambrano-Intriago, L.A., Oliveira, N.S. et al. Adsorption Behavior and Mechanism of Oxytetracycline on Rice Husk Ash: Kinetics, Equilibrium, and Thermodynamics of the Process. Water Air Soil Pollut 231, 103 (2020). https://doi.org/10.1007/s11270-020-04473-6
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DOI: https://doi.org/10.1007/s11270-020-04473-6