Inhibition of Cr6+ by the formation of in-situ Cr3+ containing solid-solution in Al2O3–CaO–Cr2O3–SiO2 system

Zhang, Wenke; Song, Shengqiang; Nath, Mithun; Xue, Zhengliang; Ma, Guojun; Li, Yawei

doi:10.1016/j.ceramint.2020.12.092

Cited by 31 publications

(7 citation statements)

References 26 publications

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“…Furthermore, the binding energies of Cr 2p 3/2 and Cr 2p 1/2 were found to be 576.8 ± 0.3 eV and 586.7 ± 0.3 eV, respectively. These values were identical to the Cr 2p binding energies of Cr (III), as reported by Zhang et al (2021) . Also, the binding energies of Zn 2p 3/2 and Zn 2p 1/2 were found to be 1,020.8 ± 0.3 eV and 1,043.9 ± 0.3 eV, respectively.…”

Section: Resultssupporting

confidence: 88%

A study of the solidification and stability mechanisms of heavy metals in electrolytic manganese slag-based glass-ceramics

et al. 2022

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To better solve the waste pollution problem generated by the electrolytic manganese industry, electrolytic manganese slag as the main raw material, chromium iron slag, and pure chemical reagents containing heavy metal elements mixed with electrolytic manganese slag doping. A parent glass was formed by melting the slag mixture at 1,250°C, which was, thereafter, heat-treated at 900°C to obtain the glass-ceramic. The results from characterizations showed that the heavy metal elements in the glass-ceramic system were well solidified and isolated, with a leakage concentration at a relatively low level. After crystallization, the curing rates of harmful heavy metals all exceed 99.9%. The mechanisms of heavy metal migration, transformation, and solidification/isolation in glass-ceramic curing bodies were investigated by using characterization methods such as chemical elemental morphological analysis, transmission electron microscopy, and electron microprobe. The most toxic Cr and Mn elements were found to be mainly kept in their residual state in the glass-ceramic system. It was concluded that the curing mechanism of the heavy metals in a glass-ceramic can either be explained by the chemical curing induced by bonding (or interaction) during phase formation, or by physical encapsulation. Characterization by using both Transmission electron microscopy and EPMA confirmed that Cr and Mn were mainly present in the newly formed spinel phase, while the diopside phase contained a small amount of Mn. Zn, Cd, and Pb are not found to be concentrated and uniformly dispersed in the system, which is speculated to be physical coating and curing.

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Section: Resultssupporting

confidence: 88%

A study of the solidification and stability mechanisms of heavy metals in electrolytic manganese slag-based glass-ceramics

et al. 2022

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“…54.7 eV was observed for both samples, as shown in Figure 9a [32]. There are four binding energies: 576.4 eV for Cr 3+ 2p 3/2 , 579.6 eV for Cr 6+ 2p 3/2 , 586.3 eV for Cr 3+ 2p 1/2 and 588.9 eV for Cr 6+ 2p 1/2 , as shown in Figure 9b [33][34][35]. The ratio between Cr 6+ and Cr 3+ is 0.735:1 for LiCrTiO 4 -850-powder and 0.632:1 for the LiCrTiO 4 -850-pellet, according to their peak areas.…”

Section: Figure 6 (A)mentioning

confidence: 76%

Electrochemical Oscillation during Galvanostatic Charging of LiCrTiO4 in Li-Ion Batteries

et al. 2021

Materials

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In the late 1960s, the establishment of Prigogine’s dissipative structure theory laid the foundation for the (electro)chemical oscillation phenomenon, which has been widely investigated in some electrochemical reactions, such as electro-catalysis and electro-deposition, while the electrochemical oscillation of Li-ion batteries has just been discovered in spinel Li4Ti5O12 a few years before. In this work, spinel LiCrTiO4 samples were synthesized by using a high-temperature solid-state method, characterized with SEM (Scanning electron microscope), XRD (X-ray diffraction), Raman and XPS (X-ray photoelectron spectroscopy) measurements, and electrochemically tested in Li-ion batteries to study the electrochemical oscillation. When sintering in a powder form at a temperature between 800 and 900 °C, we achieved the electrochemical oscillation of spinel LiCrTiO4 during charging, and it is suppressed in the non-stoichiometric LiCrTiO4 samples, especially for reducing the Li content or increasing the Cr content. Therefore, this work developed another two-phase material as the powder-sintered LiCrTiO4 exhibiting the electrochemical oscillation in Li-ion batteries, which would inspire us to explore more two-phase electrode materials in Li-ion batteries, Na-ion batteries, etc.

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“…588.0 eV and ca. 578.4 eV can be ascribed to Cr 2p 1/2 and Cr 2p 3/2 of Cr 6+ , 17,[21][22][23] indicating that Cr species mainly exist in the form of Cr 3+ and Cr 6+ in all the Cr-loaded HNT samples. Among them, Cr 6+ is formed by oxidation of Cr 3+ by oxygen in air during calcination, which is consistent with the above UV-vis DRS results.…”

Section: Surface Species Composition Analysismentioning

confidence: 96%

Removal of ethyl mercaptan from gas streams using chromium modified hexaniobate nanotubes

Zhu

2022

CrystEngComm

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Inhibition of Cr6+ by the formation of in-situ Cr3+ containing solid-solution in Al2O3–CaO–Cr2O3–SiO2 system

Cited by 31 publications

References 26 publications

A study of the solidification and stability mechanisms of heavy metals in electrolytic manganese slag-based glass-ceramics

A study of the solidification and stability mechanisms of heavy metals in electrolytic manganese slag-based glass-ceramics

Electrochemical Oscillation during Galvanostatic Charging of LiCrTiO4 in Li-Ion Batteries

Removal of ethyl mercaptan from gas streams using chromium modified hexaniobate nanotubes

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