| Autor: |
Happy Mothepane Mabowa, Andile Mkhohlakai, Luke Chimuka, James Tshilongo |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
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| Zdroj: |
Environmental Advances, Vol 16, Iss , Pp 100531- (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2666-7657 |
| DOI: |
10.1016/j.envadv.2024.100531 |
| Popis: |
This study compares nickel oxide (NiO) derived from fire assay waste nickel sulphide (FA-NiS) and chemical precipitation and sol-gel process. This work reports the first time NiO prepared through chemical precipitation from the waste for VOC sensing purposes. Additionally, herein we provide insights into comparing the properties of NiO obtained through different methods and their potential for environmental sensing applications. Structural, morphological, and elemental characterizations are conducted, alongside preliminary investigation into their volatile organic compounds (VOCs) sensing application. After Cu extraction with 5,8-diethyl-7-hydroxydodecan-6-oxime, the nickel (Ni) raffinate was precipitated using lime (Ca(OH)2) at pH 2.5 and 6.5 conditions. Scanning electron microscope (SEM) -energy dispersive spectroscopy and X-ray photoelectron spectroscopy confirmed nickel and oxygen (O2) presence at pH 6.5, and iron (Fe), Ni, and O presence at pH 2.5. X-ray diffraction revealed a cubic crystal structure and high average crystallinity (39 - 41 nm) for both sol-gel process and chemical precipitation of NiO. SEM showed uniform, spherical particles for the sol-gel process while chemical precipitation displayed aggregated layered granules. NiO precipitated at pH 2.5 exhibited coalesced hexagonal particles with predominant Fe and Ni presence. Developed analytical methods for inductively coupled plasma optical emission and X-ray fluorescence demonstrated high purity NiO (≈75 %) with low relative standard deviation (RSD |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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