Experimental and computational studies of crystal violet removal from aqueous solution using sulfonated graphene oxide

Olayinka Oluwaseun Oluwasina*, Adedeji Adebukola Adelodun, Olugbenga Oludayo Oluwasina, Helio A. Duarte, Sunday Joseph Olusegun

*Corresponding author af dette arbejde

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

3 Citationer (Scopus)
2 Downloads (Pure)

Abstract

Positively charged contaminants can be strongly attracted by sulfanilic acid-functionalized graphene oxide. Here, sulfonated graphene oxide (GO-SO3H) was synthesized and characterized for cationic crystal violet (CV) adsorption. We further studied the effect of pH, initial concentration, and temperature on CV uptake. The highest CV uptake occurred at pH 8. A kinetic study was also carried out by applying the pseudo-first-order and pseudo-second-order models. The pseudo-second-order’s adsorption capacity (qe) value was much closer to the experimental qe (qeexp:0.13, qecal:0.12) than the pseudo-first-order model (qeexp:0.13, qecal:0.05). The adsorption performance was accomplished rapidly since the adsorption equilibrium was closely obtained within 30 min. Furthermore, the adsorption capacity was significantly increased from 42.85 to 79.23%. The maximum adsorption capacities of GO-SO3H where 97.65, 202.5, and 196.2 mg·g−1 for CV removal at 298, 308, and 328 K, respectively. The Langmuir and Freundlich adsorption isotherms were applied to the experimental data. The data fit well into Langmuir and Freundlich except at 298 K, where only Langmuir isotherm was most suitable. Thermodynamic studies established that the adsorption was spontaneous and endothermic. The adsorption mechanism was revealed by combining experimental and computational methods. These findings suggest that GO-SO3H is a highly adsorbent for removing harmful cationic dye from aqueous media.
OriginalsprogEngelsk
Artikelnummer6207
TidsskriftScientific Reports
Vol/bind14
Udgave nummer1
Antal sider13
ISSN2045-2322
DOI
StatusUdgivet - 2024

Bibliografisk note

Funding Information:
The authors thank The World Academy of Sciences-United Nations Educational, Scientific and Cultural Organization (TWAS-UNESCO), for the funding of this work. This work was funded through the Seed Grant for New African Principal Investigators-SG-NAPI Agreement No: 4500454116.

Publisher Copyright:
© The Author(s) 2024.

Citationsformater