Modified Grape Seeds: A Promising Alternative for Nitrate Removal from Water
| Autor: | Natalija Velić, Mirna Habuda-Stanić, Marija Stjepanović |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Technology
nitrate removal adsorption adsorbent grape seeds column study Article chemistry.chemical_compound symbols.namesake Adsorption Nitrate Desorption General Materials Science Ion-exchange resin Microscopy QC120-168.85 Chemistry QH201-278.5 Langmuir adsorption model Engineering (General). Civil engineering (General) TK1-9971 Intraparticle diffusion model Descriptive and experimental mechanics Wastewater Freundlich model symbols Electrical engineering. Electronics. Nuclear engineering TA1-2040 Nuclear chemistry |
| Zdroj: | Materials Volume 14 Issue 17 Materials, Vol 14, Iss 4791, p 4791 (2021) |
| DOI: | 10.3390/ma14174791 |
| Popis: | The aim of this work was to investigate grape seeds as a potential adsorbent for nitrate removal from water. Grape seeds were modified by quaternization and the applicability of the modified grape seeds (MGS) was evaluated in batch adsorption experiments. Fixed bed adsorption and regeneration studies were carried out to determine the regeneration capacity of MGS. The maximum adsorption capacity of 25.626 mg g−1 at native pH (6.3) for nitrate removal by MSG was comparable to that of the commercial anion exchange resin Relite A490 under similar conditions. The percent removal of nitrate from model nitrate solution was 86.47% and 93.25% for MGS, and Relite A490, respectively, and in synthetic wastewater 57.54% and 78.37%. Analysis of the batch adsorption data using isotherm models revealed that the Freundlich model provided a better fit to the data obtained than the Langmuir model, indicating multilayer adsorption. In kinetic terms, the results showed that the adsorption followed the pseudo-first order model. By investigating the adsorption mechanism, the results suggest that the intraparticle diffusion model was not the only process controlling the adsorption of nitrate on MGS. In column experiments (adsorption/desorption studies), three adsorption cycles were tested with minimal decrease in adsorption capacities, implying that this alternative adsorbent can be successfully regenerated and reused. |
| Databáze: | OpenAIRE |
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