| Autor: |
Jingmin Wan, Fawang Zhang, Zhantao Han, Le Song, Chaoyue Zhang, Jiasen Zhang |
| Jazyk: |
angličtina |
| Rok vydání: |
2021 |
| Předmět: |
|
| Zdroj: |
Arabian Journal of Chemistry, Vol 14, Iss 8, Pp 103234- (2021) |
| Druh dokumentu: |
article |
| ISSN: |
1878-5352 |
| DOI: |
10.1016/j.arabjc.2021.103234 |
| Popis: |
A hydrothermal alkali modification method was used to produce geopolymer (BFA-GP) from biofuel ash (BFA). The product was characterized by scanning electron microscopy with energy dispersive spectrometry (SEM-EDS), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared reflection (FTIR), and X-ray photoelectron spectroscopy (XPS). Significant amount of geopolymer and gismondine was produced by this modification. The surface area increased from 20.41 m2 g−1 to 56.63 m2 g−1. The adsorption capacity of BFA-GP can reach 29.92 and 137.49 mg g−1 for Cd2+ and Pb2+, respectively, in a pure solution at 298 K, which is about triple of that by the original BFA. Competitive adsorption of Cd2+ and Pb2+ showed that the binding affinity is Pb2+> Cd2+. Chemical sorption including electrostatic attraction, chelate reaction, and ion-exchange is the dominant mechanism of heavy metal adsorption on BFA-GP. And the adsorption thermodynamics indicates that adsorption reaction of heavy metal ions by BFA-GP is spontaneous and endothermic. This modification provided a cost-effective and environmentally friendly way to change BFA to adsorbent for heavy metals with promising application prospects. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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