Adsorption of Omeprazole on Biobased Adsorbents Doped with Si/Mg: Kinetic, Equilibrium, and Thermodynamic Studies

Roberta A Teixeira; Pascal S Thue; Éder C Lima; Alejandro Grimm; Mu Naushad; Guilherme L Dotto; Glaydson S Dos Reis

doi:10.3390/molecules28124591

Adsorption of Omeprazole on Biobased Adsorbents Doped with Si/Mg: Kinetic, Equilibrium, and Thermodynamic Studies

Molecules. 2023 Jun 6;28(12):4591. doi: 10.3390/molecules28124591.

Authors

Roberta A Teixeira¹, Pascal S Thue², Éder C Lima³, Alejandro Grimm⁴, Mu Naushad⁵, Guilherme L Dotto⁶, Glaydson S Dos Reis⁴

Affiliations

¹ Graduate Program in Water Resources and Environmental Sanitation, Hydraulic Research Institute (IPH), Federal University of Rio Grande do Sul (UFRGS), Porto Alegre 91501-970, RS, Brazil.
² Environmental Science Graduate Program, Engineering Center, Federal University of 8 Pelotas (UFPel), 989 Benjamin Constant St., Pelotas 96010-020, RS, Brazil.
³ Institute of Chemistry, Federal University of Rio Grande do Sul-UFRGS, Av. Bento Gonçalves 9500, P.O. Box 15003, Porto Alegre 91501-970, RS, Brazil.
⁴ Department of Forest Biomaterials and Technology, Biomass Technology Centre, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden.
⁵ Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia.
⁶ Research Group on Adsorptive and Catalytic Process Engineering (ENGEPAC), Federal University of Santa Maria, Av. Roraima, 1000-7, Santa Maria 97105-900, RS, Brazil.

Abstract

This paper proposes an easy and sustainable method to prepare high-sorption capacity biobased adsorbents from wood waste. A biomass wood waste (spruce bark) was employed to fabricate a composite doped with Si and Mg and applied to adsorb an emerging contaminant (Omeprezole) from aqueous solutions, as well as synthetic effluents loaded with several emerging contaminants. The effects of Si and Mg doping on the biobased material's physicochemical properties and adsorptive performance were evaluated. Si and Mg did not influence the specific surface area values but impacted the presence of the higher number of mesopores. The kinetic and equilibrium data presented the best fitness by the Avrami Fractional order (AFO) and Liu isotherm models, respectively. The values of Q_max ranged from 72.70 to 110.2 mg g^-1 (BP) and from 107.6 to 249.0 mg g^-1 (BTM). The kinetic was faster for Si/Mg-doped carbon adsorbent, possibly due to different chemical features provoked by the doping process. The thermodynamic data showed that the adsorption of OME on biobased adsorbents was spontaneous and favorable at four studied temperatures (283, 293, 298, 303, 308, 313, and 318 K), with the magnitude of the adsorption correspondent to a physical adsorption process (ΔH° < 2 kJ mol^-1). The adsorbents were applied to treat synthetic hospital effluents and exhibited a high percentage of removal (up to 62%). The results of this work show that the composite between spruce bark biomass and Si/Mg was an efficient adsorbent for OME removal. Therefore, this study can help open new strategies for developing sustainable and effective adsorbents to tackle water pollution.

Keywords: adsorption; magnesium carbon dopant; omeprazole; silica carbon dopant; wood waste.

Grants and funding

The authors are grateful to the Researchers Supporting Project number (RSP2023R8), King Saud University, Riyadh, Saudi Arabia, for the financial support. The authors are also grateful to Bio4Energy and SLU (Sweden), CAPES, and CNPq (Brazil) for financing part of this current research.