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Adsorption of Basic Violet 14 in aqueous solutions using KMnO4-modified activated carbon
Qianqian Shi1, Jian Zhang, Chenglu Zhang
1School of Environmental Science and Engineering, Shandong University, Jinan 250100, China.
Journal of Colloid and Interface Science
|December 29, 2009
Summary
This study developed a KMnO(4)-modified activated carbon from Typha orientalis for efficient Basic Violet 14 removal. The optimized adsorbent demonstrated excellent adsorption capacity and followed pseudo-second-order kinetics for dye removal from aqueous solutions.
Area of Science:
- Environmental Chemistry
- Materials Science
- Water Treatment
Background:
- Basic Violet 14 is a common industrial dye pollutant.
- Activated carbon is a widely used adsorbent for dye removal.
- Developing cost-effective and efficient adsorbents is crucial for wastewater treatment.
Purpose of the Study:
- To prepare and characterize activated carbon from Typha orientalis.
- To investigate the effectiveness of KMnO(4) modification on activated carbon for Basic Violet 14 removal.
- To optimize adsorption conditions and evaluate the adsorption mechanism.
Main Methods:
- Activated carbon was synthesized from Typha orientalis and modified with KMnO(4).
- Batch adsorption experiments were conducted to study the effects of adsorbent dosage, pH, ionic strength, temperature, and contact time.
- Adsorption equilibrium data were analyzed using Langmuir and Freundlich isotherms.
- Adsorption kinetics were evaluated using pseudo-first-order, pseudo-second-order, and intraparticle diffusion models.
Main Results:
- KMnO(4) treatment significantly enhanced the physicochemical properties and adsorption capacity of the activated carbon.
- The adsorption process was found to be highly dependent on carbon dosage, pH, ionic strength, and temperature.
- Equilibrium data best fitted the Langmuir isotherm model, indicating monolayer adsorption.
- Adsorption kinetics were best described by the pseudo-second-order model, suggesting chemisorption was the rate-limiting step.
Conclusions:
- KMnO(4)-modified Typha orientalis activated carbon is a promising adsorbent for Basic Violet 14 removal.
- The adsorption mechanism involves both physical and chemical interactions, with chemisorption playing a dominant role.
- This study provides valuable insights for the design of efficient and sustainable wastewater treatment processes.
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