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Dye removal from aqueous solution by adsorption on treated sawdust
V K Garg1, Renuka Gupta, Anu Bala Yadav
1Department of Environmental Science and Engineering, Guru Jambheshwar University, Hisar, 125001, Haryana, India. vinodkgarg@yahoo.com
Bioresource Technology
|April 18, 2003
Summary
Sulphuric acid treated sawdust effectively removes malachite green dye, outperforming formaldehyde treated sawdust. This sawdust adsorbent shows promise for industrial wastewater treatment in stirred tank reactors.
Area of Science:
- Environmental Science
- Water Treatment
- Adsorption Technology
Background:
- Malachite green is a common synthetic dye used in various industries.
- Wastewater containing malachite green poses environmental and health risks.
- Developing cost-effective adsorbents for dye removal is crucial.
Purpose of the Study:
- To evaluate the adsorption efficiency of treated sawdust for malachite green.
- To compare the performance of sulphuric acid treated sawdust (SD) with formaldehyde treated SD and activated carbon.
- To determine optimal conditions for malachite green adsorption.
Main Methods:
- Sawdust was treated with formaldehyde and sulphuric acid.
- Adsorption experiments were conducted using varying dye concentrations, adsorbent doses, pH, and agitation times.
- Results were compared with laboratory-grade activated carbon.
Main Results:
- Sulphuric acid treated sawdust exhibited higher adsorption efficiency than formaldehyde treated sawdust.
- Adsorption kinetics followed a first-order rate expression and the Lagergren equation.
- Optimal pH for dye removal was between 6 and 9 for both adsorbents.
Conclusions:
- Sulphuric acid treated sawdust is a viable and efficient adsorbent for malachite green.
- Both treated sawdust adsorbents demonstrated effectiveness in decolorizing dilute dye solutions.
- Treated sawdust presents an attractive, cost-effective option for dye adsorption in batch or stirred tank reactors.
