Aqueous phase adsorption of phenothiazine derivative onto zinc oxide doped activated carbon.

Autor: Obadimu CO; Department of Chemistry, Akwa Ibom State University, Ikot Akpaden, Nigeria., Shaibu SE; Department of Chemistry, University of Uyo, Uyo, Nigeria., Enin GN; Department of Chemistry, University of Uyo, Uyo, Nigeria., Ituen EB; Emerging Materials and Energy Group, Department of Chemistry, University of Uyo, Uyo, Nigeria., Anweting IB; Department of Chemistry, University of Uyo, Uyo, Nigeria., Ubong UU; Department of Chemistry, Akwa Ibom State University, Ikot Akpaden, Nigeria., Ekwere IO; Department of Chemistry, Akwa Ibom State University, Ikot Akpaden, Nigeria., Adewusi SG; Department of Chemistry, School of Sciences, Federal University of Education, Zaria, Nigeria., Adeoye TJ; Department of Chemistry, University of Vermont, Burlington, VT, 05405, USA., Fapojuwo DP; Department of Chemistry, Nelson Mandela University, Port Elizabeth, South Africa., Ofon UA; Department of Microbiology, University of Uyo, Uyo, Nigeria., Fatunla OK; Department of Microbiology, University of Uyo, Uyo, Nigeria., Essien NS; Department of Chemistry, University of Uyo, Uyo, Nigeria., Audu OY; Drug Discovery and Development Centre (H3D), Department of Chemistry, University of Cape Town, Rondebosch 7701, Cape Town, South Africa., Tshentu ZR; Department of Chemistry, Nelson Mandela University, Port Elizabeth, South Africa., Nelana SM; Department of Chemistry, Vaal University of Technology, Vanderbijlpark, South Africa., Klink MJ; Department of Chemistry, Vaal University of Technology, Vanderbijlpark, South Africa., Ayanda OS; Department of Chemistry, Federal University Oye-Ekiti, Oye-Ekiti, Nigeria. osayanda@gmail.com.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2024 Sep 16; Vol. 14 (1), pp. 21611. Date of Electronic Publication: 2024 Sep 16.
DOI: 10.1038/s41598-024-71196-7
Abstrakt: Plant-mediated synthesis of nanoparticles is a sustainable approach that has gained widespread scientific acceptance due to its numerous benefits and applications. In this study, a zinc oxide-doped activated carbon (ZAC) derived from palm kernel shells (PKS) was synthesized via a bioreduction route using a water-based extract of Nymphaea lotus leaves as a reducing agent. The synthesized ZAC nanocomposites were characterized using microscopic (TEM, SEM) and spectroscopic (FTIR, EDS, XRD, and UV-Vis) analyses. The adsorptive properties of ZAC and efficiency in scavenging a phenothiazine derivative (methylene blue) from an aqueous solution were investigated. Results reveal that nano-scale ZAC particles were crystalline, exhibited irregular shapes, with an average size of 45 nm, and were highly dispersed. The optimum quantity adsorbed was 248 mg/g at a methylene blue concentration of 140 mg/L for 60 min using 0.02 g/100 mL of ZAC. Adsorption and kinetics data closely aligned with the Freundlich isotherm and the pseudo-second-order model, respectively indicating heterogeneous surface adsorption and chemisorption as the dominant mechanisms. The regeneration study of ZAC shows that over five cycles, thermal regeneration maintained high adsorption capacity with minimal decline and chemical regeneration significantly led to reduction in the adsorption capacity but solvent washing offered a balance between efficacy and structural preservation.
(© 2024. The Author(s).)
Databáze: MEDLINE
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