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Adsorption of basic dye from aqueous solution onto fly ash
1College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310027, PR China; College of Materials and Chemical Engineering, Zhejiang University, Hangzhou 310027, PR China.
Journal of Environmental Management
|February 20, 2007
Summary
Acid-treated fly ash effectively removes methylene blue dye from water. Freundlich isotherm and pseudo-second-order kinetics best describe this low-cost adsorption process, which is endothermic.
Area of Science:
- Environmental Chemistry
- Materials Science
- Adsorption Science
Background:
- Fly ash, a byproduct of coal combustion, presents disposal challenges.
- Developing cost-effective adsorbents for dye removal is crucial for water remediation.
- Methylene blue is a common model dye pollutant in industrial wastewater.
Purpose of the Study:
- To investigate the efficacy of sulfuric acid-treated fly ash as a low-cost adsorbent for methylene blue removal.
- To characterize the adsorption behavior using isotherm and kinetic models.
- To determine the thermodynamic nature of the adsorption process.
Main Methods:
- Fly ash was treated with sulfuric acid (H2SO4) to enhance its adsorption properties.
- Batch adsorption experiments were conducted using methylene blue in aqueous solutions.
- Adsorption data were analyzed using Langmuir and Freundlich isotherm models.
- Adsorption kinetics were evaluated using pseudo-first-order and pseudo-second-order models.
- Thermodynamic parameters, including enthalpy change, were calculated.
Main Results:
- Acid treatment significantly increased the specific surface area and methylene blue adsorption capacity of fly ash.
- The Freundlich isotherm model provided a better fit to the experimental data than the Langmuir model.
- The pseudo-second-order kinetic model accurately described the adsorption rate.
- The positive enthalpy change (5.63 kJ/mol) indicated an endothermic adsorption process.
Conclusions:
- Sulfuric acid-treated fly ash is a promising, low-cost adsorbent for methylene blue removal from wastewater.
- The adsorption mechanism is best described by the Freundlich isotherm and pseudo-second-order kinetics.
- The endothermic nature of the adsorption suggests that temperature may influence removal efficiency.
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