Adsorptive removal of vitamin B₆ and ciprofloxacin using polyurethane foam in pure and pharmaceutical preparations: Kinetic and equilibrium studies

Abstract

The release of active pharmaceutical ingredients and their metabolites in surface waters and groundwater with insufficiently treated wastewaters nowadays may be a global environmental concern. In this study, simple, inexpensive, and solid phase procedure has been developed for the removal of pyridoxine hydrochloride (vitamin B 6 , PDX) and ciprofloxacin (CPX) onto polyurethane foam (PUF) using the batch mode technique. PUF was characterized using scanning electron microscopy and FT-IR spectroscopy. The batch experiments indicated optimum conditions for the adsorption process at pH 5.6 for PDX and CPX. The optimum contact time to reach its best removal is 30 min for the removal of both drugs and the sorbent amount at 1.0 and 1.5 g for PDX and CPX, respectively. It was found that the experimental data for the adsorption of PDX fit well into Langmuir model with R 2 values (0.979).Whereas the adsorption of CPX follows Freundlich model with R 2 value (0.914). Adsorption process undergoes pseudo-first-order kinetic as proved by

Attached culture of Gibberella fujikuroi for biocomposite sorbent production and ciprofloxacin sequestration applications

“…The trend observed in this study appears to be similar to the general pH trend found for the sorption of CIP onto polyurethane foam. The possible interactions between CIP and polyurethane foam were evaluated similarly by considering pKa 1 and pKa 2 values of CIP and surface charge of the sorbent material 50 …”

Adsorption performances and electrochemical characteristics of methyl blue onto magnesium-zinc ferrites

“…When the adsorption process was finished, magnetic field was applied to separate the adsorbent, and the remanent liquid was taken to measure the absorbances on UV. The adsorbance (q) and the removal efficiency (η) of the nanomaterials were calculated on the basis of equations (1) and (2) [31].…”