The effects of siderite,hematite,and goethite on pyrite reactions in sodium aluminate solution at high temperatures,based on the coexistence of pyrite and iron-bearing minerals in bauxite,were studied.The addition of ...The effects of siderite,hematite,and goethite on pyrite reactions in sodium aluminate solution at high temperatures,based on the coexistence of pyrite and iron-bearing minerals in bauxite,were studied.The addition of siderite,goethite,and hematite increases the concentrations of S_(2)O_(3)^(2−),SO_(3)^(2−)and SO_(4)^(2−),enhancing sulfur removal during desilication.Siderite and hematite facilitate nearly 100%magnetite formation from pyrite,whereas goethite leads to the formation of both hematite and magnetite from pyrite through a multiphase transformation process.Iron-bearing minerals significantly increase the iron content in residues and enhance iron recovery from the red mud.Siderite,goethite,and hematite produce a porous surface in the form of erosive holes due to electrochemical corrosion,improving reaction efficiency of pyrite.Additionally,electrochemical corrosion promotes the pyrite reaction in accordance with the Kröger and Ziegler models,controlled by interfacial diffusion and chemical reactions in the presence of siderite,hematite and magnetite.展开更多
Carbon dots(CDs),as a kind of carbon nanomaterials,have attracted widespread attention due to their unique structure and excellent optical properties,and they are low-cost,environmentally friendly and biocompatible.Ho...Carbon dots(CDs),as a kind of carbon nanomaterials,have attracted widespread attention due to their unique structure and excellent optical properties,and they are low-cost,environmentally friendly and biocompatible.However,the development of near-infrared(NIR)emission CDs remains a challenge.In this study,we successfully prepared CDs with a maximum emission of714 nm using citric acid as the carbon source,thiourea and ammonium fluoride as the dopant source,and N,N-dimethylformamide as the solvent.The quantum yield(QY)is as high as 22.64%.Interestingly,the prepared CDs self-oxidize in the presence of oxygen,resulting in a blue shift of their emission.Therefore,they can be used to prepare white light-emitting diodes(WLEDs)without adding other fluorescent substances.Notably,the work presented herein constitutes the first report of WLEDs preparation from single CDs.展开更多
Based on the interference effect of surface self-oxidation peak on the oxygen evolution reaction(OER)performance,appropriate experimental strategies and data processing methods are crucial to correctly identify and ad...Based on the interference effect of surface self-oxidation peak on the oxygen evolution reaction(OER)performance,appropriate experimental strategies and data processing methods are crucial to correctly identify and address the oxidation peak in nickel-based materials to ensure data accuracy.Considering these facts that frequent OER performance misjudgment would confuse the readers,we revealed this reason and proposed the use of multi-potential step method to avoid non-steady-state currents caused by capacitive charging effects or intermediate oxidation.Additionally,combining electrochemical impedance spectroscopy(EIS)analysis,we discussed high-frequency response characteristics to further reveal the surface self-oxidation process.These research findings are crucial for accurately evaluating the actual performance of some special materials in electrochemical catalysis.展开更多
Flexible transparent conductive films are gaining attention day by day over the last few years due to it is a key component of next generation flexible electronics and optoelectronic devices.Indium tin oxide(ITO)as on...Flexible transparent conductive films are gaining attention day by day over the last few years due to it is a key component of next generation flexible electronics and optoelectronic devices.Indium tin oxide(ITO)as one of the most widely used transparent conductive material is limited by the traditional deposition approach cannot be achieve ultra-thin,which results in its brittle nature.Herein,a novel strategy for fabricating highly transparent conductive films by liquid metal interface phase separation technique based on low-melting liquid metal of InxSn100-x alloy is reported,during the solid-to-liquid phase transition of alloy,the monolayer of surface oxide film segregated with the bulk phase and was printed on the flexible polyethylene-naphthalate(PEN)substrate under the van der Waals.This novel strategy can directly print the ultra-thin self-oxide with the structure of ITO on PEN substrate,with the resulting of transparency over 97.5%and resistivity as low as 0.21 kU cm,providing a new way of lowcost raw ITO material as well as the personalized preparation strategy.The desirable highly transparent conductive films are comparable to recently reported ITO film,together with advantages of pretty steady,make them attractive as various flexible transparent conductive electrodes,for example,an ultra-thin ITO film is developed for luminescent devices.展开更多
基金the National Key R&D Program of China(No.2022YFC2904404).
文摘The effects of siderite,hematite,and goethite on pyrite reactions in sodium aluminate solution at high temperatures,based on the coexistence of pyrite and iron-bearing minerals in bauxite,were studied.The addition of siderite,goethite,and hematite increases the concentrations of S_(2)O_(3)^(2−),SO_(3)^(2−)and SO_(4)^(2−),enhancing sulfur removal during desilication.Siderite and hematite facilitate nearly 100%magnetite formation from pyrite,whereas goethite leads to the formation of both hematite and magnetite from pyrite through a multiphase transformation process.Iron-bearing minerals significantly increase the iron content in residues and enhance iron recovery from the red mud.Siderite,goethite,and hematite produce a porous surface in the form of erosive holes due to electrochemical corrosion,improving reaction efficiency of pyrite.Additionally,electrochemical corrosion promotes the pyrite reaction in accordance with the Kröger and Ziegler models,controlled by interfacial diffusion and chemical reactions in the presence of siderite,hematite and magnetite.
基金supported by the National Natural Science Foundation of China(21905253,51973200)the China Postdoctoral Science Foundation(2018M640681,2019T120632)the Natural Science Foundation of Henan(202300410372)。
文摘Carbon dots(CDs),as a kind of carbon nanomaterials,have attracted widespread attention due to their unique structure and excellent optical properties,and they are low-cost,environmentally friendly and biocompatible.However,the development of near-infrared(NIR)emission CDs remains a challenge.In this study,we successfully prepared CDs with a maximum emission of714 nm using citric acid as the carbon source,thiourea and ammonium fluoride as the dopant source,and N,N-dimethylformamide as the solvent.The quantum yield(QY)is as high as 22.64%.Interestingly,the prepared CDs self-oxidize in the presence of oxygen,resulting in a blue shift of their emission.Therefore,they can be used to prepare white light-emitting diodes(WLEDs)without adding other fluorescent substances.Notably,the work presented herein constitutes the first report of WLEDs preparation from single CDs.
基金National Natural Science Foundation of China(No.22208331)Science and Technology Innovation fund of Wuhan Textile University(243001).
文摘Based on the interference effect of surface self-oxidation peak on the oxygen evolution reaction(OER)performance,appropriate experimental strategies and data processing methods are crucial to correctly identify and address the oxidation peak in nickel-based materials to ensure data accuracy.Considering these facts that frequent OER performance misjudgment would confuse the readers,we revealed this reason and proposed the use of multi-potential step method to avoid non-steady-state currents caused by capacitive charging effects or intermediate oxidation.Additionally,combining electrochemical impedance spectroscopy(EIS)analysis,we discussed high-frequency response characteristics to further reveal the surface self-oxidation process.These research findings are crucial for accurately evaluating the actual performance of some special materials in electrochemical catalysis.
基金financially supported by the National Nature Science Foundation of China(52103255,52103137)the Guangdong Basic and Applied Basic Research Foundation(2019A1515110343,2019A1515110135,2019A1515110422)+2 种基金Research Start-up Funds of DGUT(211135130)the Special Project for Key Areas of Guangdong Higher Education Institutions(2020ZDZX2024)the Training Program of Innovation and Entrepreneurship for Undergraduates,DGUT(202011819132,202111819341).
文摘Flexible transparent conductive films are gaining attention day by day over the last few years due to it is a key component of next generation flexible electronics and optoelectronic devices.Indium tin oxide(ITO)as one of the most widely used transparent conductive material is limited by the traditional deposition approach cannot be achieve ultra-thin,which results in its brittle nature.Herein,a novel strategy for fabricating highly transparent conductive films by liquid metal interface phase separation technique based on low-melting liquid metal of InxSn100-x alloy is reported,during the solid-to-liquid phase transition of alloy,the monolayer of surface oxide film segregated with the bulk phase and was printed on the flexible polyethylene-naphthalate(PEN)substrate under the van der Waals.This novel strategy can directly print the ultra-thin self-oxide with the structure of ITO on PEN substrate,with the resulting of transparency over 97.5%and resistivity as low as 0.21 kU cm,providing a new way of lowcost raw ITO material as well as the personalized preparation strategy.The desirable highly transparent conductive films are comparable to recently reported ITO film,together with advantages of pretty steady,make them attractive as various flexible transparent conductive electrodes,for example,an ultra-thin ITO film is developed for luminescent devices.
