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Modified Grape Seeds: A Promising Alternative for Nitrate Removal from Water
Marija Stjepanović1, Natalija Velić1, Mirna Habuda-Stanić1
1Faculty of Food Technology Osijek, Josip Juraj Strossmayer University of Osijek, Franje Kuhača 18, HR-31000 Osijek, Croatia.
Materials (Basel, Switzerland)
|September 10, 2021
Summary
Modified grape seeds effectively remove nitrate from water, demonstrating comparable performance to commercial resins. This sustainable adsorbent is reusable, offering a promising solution for water purification.
Area of Science:
- Environmental Science
- Materials Science
- Water Treatment
Background:
- Nitrate contamination in water poses significant environmental and health risks.
- Conventional water treatment methods for nitrate removal can be costly and inefficient.
- There is a need for sustainable and cost-effective adsorbent materials.
Purpose of the Study:
- To investigate the potential of modified grape seeds as an adsorbent for nitrate removal.
- To evaluate the adsorption capacity and efficiency of modified grape seeds.
- To assess the reusability and regeneration of the modified grape seed adsorbent.
Main Methods:
- Grape seeds were chemically modified through quaternization to create modified grape seeds (MGS).
- Batch adsorption experiments were conducted to assess nitrate removal efficiency and adsorption capacity.
- Fixed-bed column studies and regeneration experiments were performed to evaluate long-term performance and reusability.
- Adsorption data were analyzed using isotherm (Langmuir, Freundlich) and kinetic (pseudo-first order, intraparticle diffusion) models.
Main Results:
- Modified grape seeds (MGS) exhibited a maximum adsorption capacity of 25.626 mg g-1 for nitrate at pH 6.3.
- Nitrate removal percentages were 86.47% for MGS and 93.25% for commercial resin in model solutions, and 57.54% for MGS and 78.37% for resin in synthetic wastewater.
- The Freundlich isotherm model best described the adsorption data, indicating multilayer adsorption, and the pseudo-first order model fit the kinetic data.
- Adsorption mechanism was complex, not solely controlled by intraparticle diffusion.
- MGS demonstrated good regeneration capacity over three adsorption-desorption cycles with minimal loss in performance.
Conclusions:
- Modified grape seeds are a viable and effective adsorbent for nitrate removal from water.
- The performance of MGS is comparable to commercial anion exchange resins.
- The adsorbent is reusable and regenerable, presenting a sustainable alternative for water treatment applications.
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