Fabrication of Mg-Doped Sargassum Biochar for Phosphate and Ammonium Recovery
Biochars prepared from macro-algae have a lower C/N ratio compared to lignocellulosic biochar, which is advantageous for direct nutrition. In particular, <i>Sargassum</i>, a marine macro-algae, has a high Mg content; hence, it can be expected to adsorb P and N simultaneously. In this stu...
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| Autores principales: | , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/81b468704f744b9980533e04cb764930 |
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| Sumario: | Biochars prepared from macro-algae have a lower C/N ratio compared to lignocellulosic biochar, which is advantageous for direct nutrition. In particular, <i>Sargassum</i>, a marine macro-algae, has a high Mg content; hence, it can be expected to adsorb P and N simultaneously. In this study, <i>Sargassum horneri</i> biochar (SB), pyrolyzed at 400, 500, and 600 °C, was doped with innate Mg through water leaching, and nutrient recovery from the wastewater-mimicking solution was confirmed. The biochar pyrolyzed at 600 °C showed maximum Mg adsorption during water leaching, and the efficiency of K and Na removal was also high, at 92.7% and 91.9%, respectively. The addition of MgCl<sub>2</sub> during pyrolysis and high ion exchange did not show distinct advantages for surface modification and nutrient adsorption. X-ray photoelectron spectroscopy analysis confirmed the participation of biochar in the surface adsorption of Mg and PO<sub>4</sub> recovery. The PO<sub>4</sub> sorption capacity of biochar reached >120 mg·g<sup>−1</sup>, while the sorption capacity for NH<sub>4</sub> was low, at 22.8–28.2 mg·g<sup>−1</sup>, suggesting that Mg-surface-doped SB presented excellent phosphorus recovery. Hence, upgrading an adsorbent as a wastewater-treatment material and soil ameliorant that recovers nutrients using innate Mg from <i>Sargassum</i> is possible through appropriate surface modification. |
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