Izvorni znanstveni članak
https://doi.org/10.15255/CABEQ.2025.2450
Sustainable Mesoporous Silica Nanoparticles from Groundnut Shells for High-Efficiency Cr(VI) Removal: Kinetics, Isotherms, and Mechanism Insights
Shalini K.
orcid.org/0000-0002-1802-3783
; Department of Biotechnology, P.S.R. Engineering College, Sivakasi, Tamilnadu, India
Geetha K.
; Department of Biotechnology, Kamaraj College of Engineering and Technology, Virudhunagar, Tamilnadu, India
Mariaamalraj S.
; Department of Biotechnology, Sethu Institute of Technology, Kariapatti, Tamilnadu, India
Thavasilingam K.
orcid.org/0000-0002-9810-9121
; Department of Mechanical Engineering, Easwari Engineering College, Chennai, India
Sažetak
The increasing concentrations of toxic hexavalent chromium [Cr(VI)] in aquatic systems pose a major threat to human health and the environment, necessitating the development of high-performance, reasonably priced, and environmentally friendly adsorbents. Mesoporous silica nanoparticles (SiNPs) were synthesized from groundnut shell waste via alkaline extraction followed by acid precipitation, yielding 21 %. Amorphous, mesoporous silica with a high surface area (84.61 m² g–1) and a large number of silanol groups was confirmed by characterization (XRD, FTIR, SEM–EDS, and BET).
Batch adsorption experiments revealed that the maximum Cr(VI) removal efficiency reached 92 % at pH 4, with an optimum equilibrium adsorption capacity (qₑ) of 4.5955 mg g–1. The process followed pseudo-second-order kinetics (R2 = 0.99) and the Freundlich isotherm model (R2 = 0.9826), indicating chemisorption. Surface complexation was confirmed by post-adsorption analyses, demonstrating the effectiveness the SiNPs as environmentally friendly adsorbents for wastewater treatment.
This work is licensed under a Creative Commons Attribution 4.0 International License.
Ključne riječi
mesoporous silica nanoparticles; groundnut shell waste; hexavalent chromium removal; adsorption kinetics; chemisorption mechanism; sustainable wastewater treatment
Hrčak ID:
344460
URI
Datum izdavanja:
12.2.2026.
Posjeta: 180 *