Microplasma based on glow discharge could act as a non-contact gaseous electrode and has attracted much attention in both fundamental research and application. Herein, with microplasma as the anode,the electrodepositi...Microplasma based on glow discharge could act as a non-contact gaseous electrode and has attracted much attention in both fundamental research and application. Herein, with microplasma as the anode,the electrodeposition process of a series of metal and metal alloys in molten salt has been systemically studied. Four metal cations with different valence states, silver(Ag~+), nickel(Ni^(2+)), copper(Cu^(2+)), and iron(Fe^(3+)), could all be reduced on the solid cathode with high current efficiency and the corresponding metal products were of high purity. The electrodeposition of aluminum-lanthanum(Al-Ln) alloy on the aluminum cathode was also successfully carried out with microplasma as the anode, and the same alloy was obtained by using the conventional anode electrode. These results indicated that microplasma anode based on non-contact direct-current(DC) glow discharge is a promising electrode to be applied in molten salt electrolysis.展开更多
As the eruption of the lithium-ion batteries(LIBs)market will result in the generation of an unprecedented volume of end-of-life LIBs,the development of a LIBs recycling process is necessary for sustainable critical m...As the eruption of the lithium-ion batteries(LIBs)market will result in the generation of an unprecedented volume of end-of-life LIBs,the development of a LIBs recycling process is necessary for sustainable critical metal utilization and minimizing the negative environmental impacts.Here,a green and highly efficient LIBs recycling method was developed to recycle critical metals from cathode materials at room temperature by combiningmicroplasma electrochemistry and deep eutectic solvent(MIPEC-DES).The MIPECDES method generates radicals to promote metal leaching with greatly enhanced dissolution kinetics.For lithium cobalt oxide(LCO)cathode materials,theMIPEC-DES method has shown a leaching efficiency as high as 100%for lithium and 91.4%for cobalt within 180 min,which is dramatically enhanced compared to electrochemical leaching and pure DES chemical leaching.Consequently,the MIPEC-DES method resulted in a 400-fold energy saving compared to the DES chemical leaching at 220℃,with the same leaching efficiency.This MIPEC-DES strategy also showed universal applicability formetal recovery from lithium manganese oxide(LMO),lithium iron phosphate(LFP),lithium nickel manganese cobalt oxide(NMC),and NMC blackmass.The economic and environmental impacts of the MIPEC-DES process make it a green and economically attractive method for end-of-life LIBs processing.展开更多
Photocatalysis-assisted removal of uranium has been proven as an effective method for the elimination of radioactive pollution from wastewater.In this work,carbon nitride materials were synthesized in potassium hydrox...Photocatalysis-assisted removal of uranium has been proven as an effective method for the elimination of radioactive pollution from wastewater.In this work,carbon nitride materials were synthesized in potassium hydroxide(KOH)molten salt and applied to photocatalytic uranyl extraction.Obtained materials were confirmed to possess the triazine-s-heptazine structure by NMR,XPS and UV-Vis characterization,and exhibited a wider visible light absorption than graphitic carbon nitride(g-C_(3)N_(4)).The photocatalytic activity of the carbon nitride materials was tailored by varying the precursor mass fractions.The carbon nitride obtained at 80%melamine as precursor(K-CN-80)exhibited the highest photocatalytic extraction ability and its photocatalytic reaction rate is 6.6 times faster than that of g-C_(3)N_(4).The influence of sacrificial agents was studied and the results showed that triethanolamine inhibited U(Ⅵ)photoreduction,but methanol can accelerate U(Ⅵ)photoreduction by consuming photogenerated holes.This unary KOH molten salt synthesis method has exceptional potential applications in the preparation of carbon nitrides,and the obtained products showed potential in extracting U(Ⅵ)from aqueous solutions for use in nuclear fuel industry and for U(Ⅵ)environmental pollution cleanup.展开更多
基金financially supported by the National Natural Science Foundation of China (Nos.21976104, 21906051)Young Elite Scientists Sponsorship Program (No.2021QNRC001) of China Association for Science and Technology。
文摘Microplasma based on glow discharge could act as a non-contact gaseous electrode and has attracted much attention in both fundamental research and application. Herein, with microplasma as the anode,the electrodeposition process of a series of metal and metal alloys in molten salt has been systemically studied. Four metal cations with different valence states, silver(Ag~+), nickel(Ni^(2+)), copper(Cu^(2+)), and iron(Fe^(3+)), could all be reduced on the solid cathode with high current efficiency and the corresponding metal products were of high purity. The electrodeposition of aluminum-lanthanum(Al-Ln) alloy on the aluminum cathode was also successfully carried out with microplasma as the anode, and the same alloy was obtained by using the conventional anode electrode. These results indicated that microplasma anode based on non-contact direct-current(DC) glow discharge is a promising electrode to be applied in molten salt electrolysis.
基金supported by the Brain Pool program funded by the Ministry of Science and ICT through the National Research Foundation of Korea(grant no.NRF-2022H1D3A2A02051548)National Natural Science Foundation of China(grant no.22422606)supported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(grant no.RS-2023-00261543).
文摘As the eruption of the lithium-ion batteries(LIBs)market will result in the generation of an unprecedented volume of end-of-life LIBs,the development of a LIBs recycling process is necessary for sustainable critical metal utilization and minimizing the negative environmental impacts.Here,a green and highly efficient LIBs recycling method was developed to recycle critical metals from cathode materials at room temperature by combiningmicroplasma electrochemistry and deep eutectic solvent(MIPEC-DES).The MIPECDES method generates radicals to promote metal leaching with greatly enhanced dissolution kinetics.For lithium cobalt oxide(LCO)cathode materials,theMIPEC-DES method has shown a leaching efficiency as high as 100%for lithium and 91.4%for cobalt within 180 min,which is dramatically enhanced compared to electrochemical leaching and pure DES chemical leaching.Consequently,the MIPEC-DES method resulted in a 400-fold energy saving compared to the DES chemical leaching at 220℃,with the same leaching efficiency.This MIPEC-DES strategy also showed universal applicability formetal recovery from lithium manganese oxide(LMO),lithium iron phosphate(LFP),lithium nickel manganese cobalt oxide(NMC),and NMC blackmass.The economic and environmental impacts of the MIPEC-DES process make it a green and economically attractive method for end-of-life LIBs processing.
基金financially supported by the National Natural Science Foundation of China(Nos.22376059 and 21976104)the Young Elite Scientists Sponsorship Program of China Association for Science and Technology(No.2021QNRC001)the Brain Pool program funded by the Ministry of Science and ICT through the National Research Foundation of Korea(No.NRF-2022H1D3A2A02051548).
文摘Photocatalysis-assisted removal of uranium has been proven as an effective method for the elimination of radioactive pollution from wastewater.In this work,carbon nitride materials were synthesized in potassium hydroxide(KOH)molten salt and applied to photocatalytic uranyl extraction.Obtained materials were confirmed to possess the triazine-s-heptazine structure by NMR,XPS and UV-Vis characterization,and exhibited a wider visible light absorption than graphitic carbon nitride(g-C_(3)N_(4)).The photocatalytic activity of the carbon nitride materials was tailored by varying the precursor mass fractions.The carbon nitride obtained at 80%melamine as precursor(K-CN-80)exhibited the highest photocatalytic extraction ability and its photocatalytic reaction rate is 6.6 times faster than that of g-C_(3)N_(4).The influence of sacrificial agents was studied and the results showed that triethanolamine inhibited U(Ⅵ)photoreduction,but methanol can accelerate U(Ⅵ)photoreduction by consuming photogenerated holes.This unary KOH molten salt synthesis method has exceptional potential applications in the preparation of carbon nitrides,and the obtained products showed potential in extracting U(Ⅵ)from aqueous solutions for use in nuclear fuel industry and for U(Ⅵ)environmental pollution cleanup.
