Removal of Penicillin G from aqueous medium by PPI@SBA-15/ZIF-8 super adsorbent: Adsorption isotherm, thermodynamic, and kinetic studies

In the present paper, synthesis of SBA-15 nanoparticles was carried out from tetraethyl orthosilicate (TEOS) precursor using the sol-gel process. After being combined with Poly propylene imine, and ZIF-8 they were employed for the removal of Penicillin G. The synthesized combination morphology was assessed using nitrogen adsorption and desorption (BET), Fourier transform infrared (FTIR) spectroscopy, and X-ray powder diffraction (XRD). The parameters affecting Penicillin G removal, including pH, amount of adsorbent, time of contact, temperature, and concentration, were optimized, and the optimum levels of the mentioned variables were re-ported to be pH = 3, 0.03 g, 90 min, 25 ???C, and 100 ppm, respectively. In addition, application of Freundlich, Langmuir, Dubinin???Radushkevhch, and Tempkin models and pseudo-first-order and pseudo-second-order adsorption synthetic equations aimed at determining the type of adsorbent isotherm. The results showed that the best fitting of Langmuir (R2 = 0.9944, qm = 400 mg/g) for adsorption isotherm and pseudo-second-order model (R2 = 0.9905) for kinetics studies. Furthermore, data of Gibbs free energy and enthalpy demonstrated an exothermic and spontaneous process in the research.

Automated summary

In this paper, SBA-15 nanoparticles were synthesized from TEOS precursor using the sol-gel process. The synthesized nanoparticles were combined with Poly propylene imine and ZIF-8 for the removal of Penicillin G. Various characterization techniques were used to analyze the synthesized morphology. The optimization of parameters and the application of different models revealed the best fitting Langmuir isotherm and pseudo-second-order model for the adsorption process.