A zinc sulfate open framework matrix,[Zn(SO_4)(DMSO)](1),was synthesized by solvothermal evaporationusing dimethyl sulfoxide(DMSO)as the solvent.A compositeP@1,which exhibits fluorescence and room tempera-ture phospho...A zinc sulfate open framework matrix,[Zn(SO_4)(DMSO)](1),was synthesized by solvothermal evaporationusing dimethyl sulfoxide(DMSO)as the solvent.A compositeP@1,which exhibits fluorescence and room tempera-ture phosphorescence(RTP)properties,was prepared by doping 2,6-naphthalic acid(P)into matrix1at a low con-centration.P@1emitted a green RTP that was visible to the naked eye and lasted for approximately 2 s.P@1exhib-ited selective phosphorescence enhancement response towards Pb2+,with a detection limit of 2.52μmol·L-1.Themain detection mechanism is the Pb—O coordination-induced phosphorescence enhancement in the system.Inter-estingly,P@1also functioned as a dual-channel probe for the rapid detection of Fe3+ions through fluorescencequenching with a detection limit of 0.038μmol·L-1.The recognition mechanism may be attributed to the competi-tive energy absorption betweenP@1and Fe3+ions.CCDC:2388502,1.展开更多
A comprehensive electrochemical assessment of Fe2+behavior in a MgCl2−NaCl−KCl melt was reported,involving cyclic voltammetry(CV),square wave voltammetry(SWV),and chronoamperometry(CA)analyses.Reduction of Fe^(2...A comprehensive electrochemical assessment of Fe2+behavior in a MgCl2−NaCl−KCl melt was reported,involving cyclic voltammetry(CV),square wave voltammetry(SWV),and chronoamperometry(CA)analyses.Reduction of Fe2+in MgCl2−NaCl−KCl was observed to occur in a single step involving two electrons,exhibiting quasi-reversible behavior.The diffusion coefficient of Fe2+(5.75×10-5cm2/s)in this system was experimentally determined at 973 K,with an associated diffusion activation energy of 25.06 kJ/mol in the range of 973−1048 K,and an estimated standard rate constant for Fe2+/Fe of around 1×10-3cm/s.The nucleation of Fe on the tungsten electrode in the MgCl2−NaCl−KCl molten salt is insensitive to temperature and overpotential.It is found that the nucleation mode is related to the concentration of Fe2+surrounding the electrode and evolves from an instantaneous to a progressive process,accompanied by a deterioration of magnesium electrolysis due to Fe impurities.展开更多
The lime-Cu2+-xanthate process is commonly used for the flotation separation of sphalerite from pyrite.In this process,lime is added to the pulp to inhibit the floatability of pyrite.However,the excessive use of li...The lime-Cu2+-xanthate process is commonly used for the flotation separation of sphalerite from pyrite.In this process,lime is added to the pulp to inhibit the floatability of pyrite.However,the excessive use of lime can result in pipeline blockage and inadequate recovery of associated precious metals.Therefore,it is necessary to develop new flotation process that minimizes or eliminates the use of lime.In this paper,a novel Fe3+-Cu2+-butyl xanthate process was developed as an alternative to lime for separating of sphalerite from pyrite.The flotation results indicated that with the artificially-mixed minerals,the flotation recovery of pyrite was lower than 16%and that of sphalerite was higher than 47%at pH 5.0−10.0.The zeta potential measurements revealed that ferric ion preferred to adsorb on pyrite,and copper ion displaced with zinc ion from the lattice at the interface of sphalerite.The wettability analyses indicated that the hydrophobicity of sphalerite surface increased apparently after being treated with Fe3+-Cu2+-BX,while the hydrophobicity of pyrite surface remained nearly unchanged.With XPS analysis,Cu-S bond and hydrophilic ferric hydroxide were detected separately on the surface of sphalerite and pyrite after conditioning with Fe3+-Cu2+-BX,which facilitated the flotation separation of sphalerite from pyrite with butyl xanthate collector.展开更多
摘要A zinc sulfate open framework matrix,[Zn(SO_4)(DMSO)](1),was synthesized by solvothermal evaporationusing dimethyl sulfoxide(DMSO)as the solvent.A compositeP@1,which exhibits fluorescence and room tempera-ture phosphorescence(RTP)properties,was prepared by doping 2,6-naphthalic acid(P)into matrix1at a low con-centration.P@1emitted a green RTP that was visible to the naked eye and lasted for approximately 2 s.P@1exhib-ited selective phosphorescence enhancement response towards Pb2+,with a detection limit of 2.52μmol·L-1.Themain detection mechanism is the Pb—O coordination-induced phosphorescence enhancement in the system.Inter-estingly,P@1also functioned as a dual-channel probe for the rapid detection of Fe3+ions through fluorescencequenching with a detection limit of 0.038μmol·L-1.The recognition mechanism may be attributed to the competi-tive energy absorption betweenP@1and Fe3+ions.CCDC:2388502,1.
基金the financial support provided by the National Key R&D Program of China(No.2022YFB3709300).
摘要A comprehensive electrochemical assessment of Fe2+behavior in a MgCl2−NaCl−KCl melt was reported,involving cyclic voltammetry(CV),square wave voltammetry(SWV),and chronoamperometry(CA)analyses.Reduction of Fe2+in MgCl2−NaCl−KCl was observed to occur in a single step involving two electrons,exhibiting quasi-reversible behavior.The diffusion coefficient of Fe2+(5.75×10-5cm2/s)in this system was experimentally determined at 973 K,with an associated diffusion activation energy of 25.06 kJ/mol in the range of 973−1048 K,and an estimated standard rate constant for Fe2+/Fe of around 1×10-3cm/s.The nucleation of Fe on the tungsten electrode in the MgCl2−NaCl−KCl molten salt is insensitive to temperature and overpotential.It is found that the nucleation mode is related to the concentration of Fe2+surrounding the electrode and evolves from an instantaneous to a progressive process,accompanied by a deterioration of magnesium electrolysis due to Fe impurities.
基金Project(52204363)supported by the National Natural Science Foundation of ChinaProject(2024JJ8042)supported by the Hunan Natural Science Foundation,ChinaProject(22C0220)supported by the Education Department of Hunan Province,China。
摘要The lime-Cu2+-xanthate process is commonly used for the flotation separation of sphalerite from pyrite.In this process,lime is added to the pulp to inhibit the floatability of pyrite.However,the excessive use of lime can result in pipeline blockage and inadequate recovery of associated precious metals.Therefore,it is necessary to develop new flotation process that minimizes or eliminates the use of lime.In this paper,a novel Fe3+-Cu2+-butyl xanthate process was developed as an alternative to lime for separating of sphalerite from pyrite.The flotation results indicated that with the artificially-mixed minerals,the flotation recovery of pyrite was lower than 16%and that of sphalerite was higher than 47%at pH 5.0−10.0.The zeta potential measurements revealed that ferric ion preferred to adsorb on pyrite,and copper ion displaced with zinc ion from the lattice at the interface of sphalerite.The wettability analyses indicated that the hydrophobicity of sphalerite surface increased apparently after being treated with Fe3+-Cu2+-BX,while the hydrophobicity of pyrite surface remained nearly unchanged.With XPS analysis,Cu-S bond and hydrophilic ferric hydroxide were detected separately on the surface of sphalerite and pyrite after conditioning with Fe3+-Cu2+-BX,which facilitated the flotation separation of sphalerite from pyrite with butyl xanthate collector.