Simple and efficient selective extraction of lithium from spent ternary lithium-ion batteries via oxidation/de-lithiation using NaClO

Kong, Yanhui; Takaya, Yutaro; Córdova-Udaeta, Mauricio; Tokoro, Chiharu

doi:10.1016/j.seppur.2023.124280

Cited by 6 publications

(2 citation statements)

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“…To determine the main types of ROS produced in the CuNCs/HAp + H 2 O 2 system, quenching experiments were conducted (Figure AA). TBA, BQ, and FFA are generally considered to be effective scavengers of • OH, • O 2 – , and 1 O 2 , respectively. − When 0.5 M TBA or 0.5 M FFA was present, the degradation rate of MB was significantly inhibited, and the removal rates dropped from 97.8 to 41.2 and 23.3%, respectively, confirming that • OH and 1 O 2 play major roles in the CuNCs/Hap + H 2 O 2 system for catalyzed degradation of MB. When 5 mM BQ was present, there was no significant change in the degradation rate of MB, which also confirmed that • O 2 – does not play a major role in the CuNCs/Hap + H 2 O 2 system.…”

Section: Resultsmentioning

confidence: 86%

“…To further verify the production of • OH and 1 O 2 , EPR tests using TEMP and DMPO, two typical spin trapping agents, were conducted. − As depicted in Figure B, when only TEMP + 3-CuNCs/HAp was present, a triphasic signal of TEMP- 1 O 2 was observed, which could be attributed to electron transfer processes in the system. , The metal core (Cu + /Cu 0 ) of the Cu NCs possesses certain electron-donating properties. During the EPR test, a small amount of O 2 and Cu NCs dissolved in the solution were driven and eventually captured by TEMP, resulting in a signal peak similar to that of 1 O 2 .…”

Section: Resultsmentioning

confidence: 99%

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Enhancing Fenton-like Degradation of Organic Pollutants at Neutral pH by Multivalent Cu NCs/HAp Nanocatalysts

Yang,

Zhang,

Jiang

et al. 2023

Langmuir

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Heterogeneous Fenton-like catalysis is a widely used method for the degradation of organic pollutants. However, it still has some limitations such as low activity in the neutral condition, low conversion rates of metals with different valence states, and potential secondary metal pollution. In this study, a Fenton-like nanocatalyst was first created by generating ultrasmall copper nanoclusters (Cu NCs) on the surface of hydroxyapatite (HAp) through a process of doping followed by modification. This resulted in the formation of a composite nanocatalyst known as Cu NCs/HAp. With the help of hydrogen peroxide (H 2 O 2 ), Cu NCs/HAp exhibits an outstanding Fenton-like catalytic performance by efficiently degrading organic dyes such as methylene blue under mild neutral conditions. The removal rate can reach over 83% within just 30 min, demonstrating ideal catalytic universality and stability. The improved Fentonlike catalytic performance of Cu NCs/HAp can be ascribed to the synergistic effect of the multivalent Cu species through two simultaneous reaction pathways. During route I, the embedded Cu NCs with a core−shell Cu 0 /Cu + structure can undergo sequential oxidation to form Cu 2+ , which continuously activates H 2 O 2 to generate hydroxyl radicals ( • OH) and singlet oxygen ( 1 O 2 ). In route II, Cu 2+ produced from route I and initially adsorbed on the surface of HAp can be reduced by H 2 O 2 , thus regenerating Cu + species for route I and achieving a closed-loop reaction. This work has confirmed that Cu NCs loaded on HAp may be an alternative Fenton-like catalyst for degradation of organic pollutants and environmental remediation, opening up new avenues for potential applications of other Cu NCs in future water pollution control.

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Section: Resultsmentioning

confidence: 86%