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Experimental and computational studies of crystal violet removal from aqueous solution using sulfonated graphene
Olayinka Oluwaseun Oluwasina1, Adedeji Adebukola Adelodun2,3, Olugbenga Oludayo Oluwasina4
1Department of Marine Science and Technology, The Federal University of Technology, P.M.B. 704, Akure, 340110, Nigeria. oluwasinaoo@futa.edu.ng.
Scientific Reports
|March 15, 2024
Summary
Sulfonated graphene oxide (GO-SO3H) effectively removes cationic crystal violet dye from water. This adsorbent shows rapid, spontaneous, and endothermic adsorption, making it a promising material for wastewater treatment.
Area of Science:
- Materials Science
- Environmental Chemistry
- Nanotechnology
Background:
- Graphene oxide (GO) functionalization enhances its adsorption properties.
- Cationic dyes like crystal violet (CV) are common water pollutants.
- Sulfanilic acid functionalization introduces sulfonic acid groups, increasing positive charge attraction.
Purpose of the Study:
- To synthesize and characterize sulfonated graphene oxide (GO-SO3H) for cationic dye adsorption.
- To investigate the adsorption mechanism and performance of GO-SO3H for CV removal.
- To evaluate the influence of pH, concentration, and temperature on adsorption efficiency.
Main Methods:
- Synthesis and characterization of GO-SO3H.
- Batch adsorption experiments to study CV removal.
- Kinetic, isotherm, and thermodynamic analyses.
- Computational methods to elucidate adsorption mechanisms.
Main Results:
- GO-SO3H demonstrated high CV adsorption capacity, reaching 97.65-202.5 mg·g⁻¹ at different temperatures.
- Adsorption equilibrium was achieved rapidly within 30 minutes.
- The pseudo-second-order kinetic model and Langmuir isotherm best described the adsorption process.
- Thermodynamic studies indicated spontaneous and endothermic adsorption.
Conclusions:
- GO-SO3H is a highly effective adsorbent for removing cationic dyes from aqueous solutions.
- The adsorption process is efficient, rapid, and driven by favorable thermodynamic conditions.
- This functionalized graphene oxide shows significant potential for wastewater treatment applications.
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