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Effect of solid state fermentation of peanut shell on its dye adsorption performance
Jiayang Liu1, Zhixin Wang2, Hongyan Li3
1Fermentation Technology Division, Huanghuai University, Zhumadian 463000, China; Department of Crop and Soil Sciences, University of Georgia, Griffin, GA 30223, USA.
Bioresource Technology
|October 21, 2017
Summary
Solid state fermentation of peanut shells reduced their dye adsorption capacity but altered their sorptive behavior. Fermented shells showed potential as adsorbents, with efficiency influenced by surface area and lignin content.
Area of Science:
- Environmental Science
- Biotechnology
- Materials Science
Background:
- Peanut shells are agricultural byproducts with potential for wastewater treatment.
- Solid state fermentation (SSF) can modify lignocellulosic materials for enhanced functionality.
- Laccase production during SSF may impact the adsorbent properties of peanut shells.
Purpose of the Study:
- To evaluate the impact of SSF on peanut shell properties for dye adsorption.
- To compare the dye adsorption performance of fermented peanut shells (SFs) with raw peanut shells (RPS).
- To investigate the adsorption mechanism and kinetics of crystal violet removal by SFs.
Main Methods:
- Peanut shells underwent solid state fermentation.
- Fermented residues (SFs) and raw peanut shells (RPS) were characterized.
- Batch adsorption experiments were conducted to remove crystal violet dye from aqueous solutions.
- Adsorption data were fitted to isotherm and kinetic models (Langmuir, pseudo-1st/2nd order, film diffusion).
Main Results:
- SSF reduced the maximum adsorption capacity (qm) of peanut shells by approximately 50%.
- The Langmuir model best described the adsorption of crystal violet onto SFs.
- Adsorption capacity (qm) correlated positively with surface area and negatively with acid detergent lignin content.
- Adsorption was spontaneous, endothermic, and followed pseudo-1st/2nd order kinetics and film diffusion.
- Dispersed SF solutions showed higher dye removal efficiency than filter packets.
Conclusions:
- Solid state fermentation alters peanut shell adsorbent properties, reducing capacity but changing behavior.
- Surface area and lignin content are key factors influencing the adsorption performance of modified peanut shells.
- Fermented peanut shells offer a viable, albeit modified, option for crystal violet dye removal from water.
