Cleaning Water with Leftover Coriander Seeds: How It Works and Why It Matters

Jim Crocker
28th August, 2024

Cleaning Water with Leftover Coriander Seeds: How It Works and Why It Matters

Image Source: Natural Science News, 2024

Key Findings

  • The University of Mysore, India, found that coriander seed spent (NICSS) can effectively remove harmful Brilliant Green (BG) dye from wastewater
  • The study optimized conditions for maximum dye removal, achieving an adsorption capacity of approximately 110 mg g-1
  • The adsorption process is endothermic and nearly spontaneous, indicating a physical adsorption mechanism
The removal of harmful dyes from wastewater is a critical environmental challenge. Brilliant Green (BG) dye, known for its mutagenic properties, poses significant risks to aquatic ecosystems and human health. A recent study from the University of Mysore, India, explores the feasibility of using low-cost coriander seed spent (NICSS), a by-product of the nutraceutical industry, to adsorb BG dye from aqueous solutions[1]. This study builds on previous research into various adsorbents and their effectiveness in dye removal, offering a sustainable solution aligned with the principles of a circular economy. The study investigates several parameters affecting the adsorption process, including pH, dye concentration, temperature, adsorbent amount, and particle size. By examining these variables, the researchers aimed to optimize the conditions for maximum dye removal. The adsorption capacity was found to be approximately 110 mg g-1, with a maximum predicted capacity of 136.17 mg g-1 according to the Dubinin-Radushkevich isotherm model. This research aligns with prior studies on alternative adsorbents. For instance, activated carbons prepared from jute sticks have been shown to effectively remove BG dye due to their high surface area and porosity[2]. Similarly, rice husk ash (RHA) has demonstrated efficient BG adsorption, particularly at lower pH levels, and follows the Langmuir and Redlich-Peterson isotherm models[3]. Additionally, kaolin has been used to adsorb BG dye, with the adsorption process being highly dependent on the solution's pH and following the Langmuir isotherm model[4]. The current study utilized ten different isotherm models to analyze the adsorption equilibrium, including Langmuir, Freundlich, Jovanovic, Dubinin-Radushkevich, Sips, Redlich-Peterson, Toth, Vieth-Sladek, Brouers-Sotolongo, and Radke-Prausnitz. The adsorption kinetics were evaluated using diffusion film models, Dumwald-Wagner and Weber-Morris models, as well as pseudo-first- and second-order models. The data fitted well into the pseudo-second-order model, consistent with findings from studies on RHA and kaolin[3][4]. Thermodynamic analysis revealed that the adsorption process is endothermic and nearly spontaneous, with a small enthalpy change indicating a physical adsorption mechanism. This is in line with the thermodynamic parameters observed in the adsorption of BG on RHA, where the process was also found to be spontaneous and favorably influenced by temperature increases[3]. Characterization techniques such as FTIR spectroscopy and SEM imaging confirmed the adsorption of BG dye on the NICSS surface. These methods provided insights into the interaction between the dye molecules and the adsorbent, revealing the physical nature of the adsorption process. The study's innovative approach lies in its alignment with the circular economy concept. By using NICSS, a waste product with no feed, fertilizer, or fuel value, the researchers emphasize sustainability and resource efficiency. This approach replaces the traditional "end-of-life" concept with the reuse of waste, demonstrating the potential for scaling the process for broader environmental applications. In conclusion, the University of Mysore's study presents a viable and sustainable method for removing BG dye from wastewater using NICSS. By building on previous research and incorporating principles of the circular economy, this study offers a promising solution for mitigating the environmental impact of industrial dyes.

EnvironmentSustainabilityBiotech

References

Main Study

1) Bioremediation of Brilliant Green cationic dye from water using Nutraceutical Industrial Coriander Seed Spent as an adsorbent: adsorption isotherms, kinetic models, and thermodynamic studies.

Published 27th August, 2024

https://doi.org/10.1080/15226514.2024.2391949

Related Studies

2) Chemical and structural evaluation of activated carbon prepared from jute sticks for Brilliant Green dye removal from aqueous solution.

https://doi.org/10.1016/j.jhazmat.2009.09.072

3) Kinetic and equilibrium isotherm studies for the adsorptive removal of Brilliant Green dye from aqueous solution by rice husk ash.

Journal: Journal of environmental management, Issue: Vol 84, Issue 4, Sep 2007

4) Adsorption characteristics of brilliant green dye on kaolin.

https://doi.org/10.1016/j.jhazmat.2008.03.110


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