Potassium ferrate(K_(2)FeO_(4)) was used as a novel environmental-friendly depressant,and its inhibition effect on flotation performance of arsenopyrite and chalcopyrite using potassium ethyl xanthate(PEX)as a collect...Potassium ferrate(K_(2)FeO_(4)) was used as a novel environmental-friendly depressant,and its inhibition effect on flotation performance of arsenopyrite and chalcopyrite using potassium ethyl xanthate(PEX)as a collector was investigated by flotation experiments,contact angle measurements,adsorption measurements,localized electrochemical impedance spectroscopy(LEIS)measurements,and X-ray photoelectron spectroscopy(XPS)analyses.The results showed that K_(2)FeO_(4)strongly depressed arsenopyrite in a pH range of 4−11,and the flotation separation of chalcopyrite from arsenopyrite could be realized in the presence of 5×10^(−4)mol/L K_(2)FeO_(4)and 5×10^(−5)mol/L PEX at pH 8 or 10.In the presence of K_(2)FeO_(4) and PEX,the contact angle and the xanthate adsorption capacity of arsenopyrite decreased significantly.LEIS measurements showed that the addition of ferrate could significantly increase the impedance of the arsenopyrite surface.XPS analyses further confirmed that ferrate accelerated the oxidation of arsenopyrite surface.展开更多
Electrocatalytic oxidation of 5-hydroxymethylfurfural(HMF)to 2,5-furandicarboxylic acid(FDCA),a sustainable strategy to produce bio-based plastic monomer,is always conducted in a high-concentration alkaline solution(1...Electrocatalytic oxidation of 5-hydroxymethylfurfural(HMF)to 2,5-furandicarboxylic acid(FDCA),a sustainable strategy to produce bio-based plastic monomer,is always conducted in a high-concentration alkaline solution(1.0 mol L^(-1)KOH)for high activity.However,such high concentration of alkali poses challenges including HMF degradation and high operation costs associated with product separation.Herein,we report a single-atom-ruthenium supported on Co3O4(Ru1-Co3O4)as a catalyst that works efficiently in a low-concentration alkaline electrolyte(0.1 mol L^(-1)KOH),exhibiting a low potential of 1.191 V versus a reversible hydrogen electrode to achieve 10 m A cm^(-2)in 0.1 mol L^(-1)KOH,which outperforms previous catalysts.Electrochemical studies demonstrate that single-atom-Ru significantly enhances hydroxyl(OH-)adsorption with insufficient OH-supply,thus improving HMF oxidation.To showcase the potential of Ru1-Co3O4catalyst,we demonstrate its high efficiency in a flow reactor under industrially relevant conditions.Eventually,techno-economic analysis shows that substitution of the conventional1.0 mol L^(-1)KOH with 0.1 mol L^(-1)KOH electrolyte may significantly reduce the minimum selling price of FDCA by 21.0%.This work demonstrates an efficient catalyst design for electrooxidation of biomass working without using strong alkaline electrolyte that may contribute to more economic biomass electro-valorization.展开更多
基金the National Natural Science Foundation of China(Nos.52074139,51904129)Basic Research Project of Yunnan Province,China(No.202001AU070028)+2 种基金Basic Research Project for High-level Talents of Yunnan Province,China(No.KKS2202152011)Open Foundation of State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,China(No.CNMRCUKF1602)the Testing and Analyzing Funds of Kunming University of Science and Technology,China(No.2020T20150055).
文摘Potassium ferrate(K_(2)FeO_(4)) was used as a novel environmental-friendly depressant,and its inhibition effect on flotation performance of arsenopyrite and chalcopyrite using potassium ethyl xanthate(PEX)as a collector was investigated by flotation experiments,contact angle measurements,adsorption measurements,localized electrochemical impedance spectroscopy(LEIS)measurements,and X-ray photoelectron spectroscopy(XPS)analyses.The results showed that K_(2)FeO_(4)strongly depressed arsenopyrite in a pH range of 4−11,and the flotation separation of chalcopyrite from arsenopyrite could be realized in the presence of 5×10^(−4)mol/L K_(2)FeO_(4)and 5×10^(−5)mol/L PEX at pH 8 or 10.In the presence of K_(2)FeO_(4) and PEX,the contact angle and the xanthate adsorption capacity of arsenopyrite decreased significantly.LEIS measurements showed that the addition of ferrate could significantly increase the impedance of the arsenopyrite surface.XPS analyses further confirmed that ferrate accelerated the oxidation of arsenopyrite surface.
基金supported by the National Key R&D Program of China(2023YFA1507400)Natural Science Foundation of Shandong Province(ZR2023QB094)+1 种基金Young Science and Technology,the National Natural Science Foundation of China(22325805 and 21935001)Beijing Natural Science Foundation(JQ22003)。
文摘Electrocatalytic oxidation of 5-hydroxymethylfurfural(HMF)to 2,5-furandicarboxylic acid(FDCA),a sustainable strategy to produce bio-based plastic monomer,is always conducted in a high-concentration alkaline solution(1.0 mol L^(-1)KOH)for high activity.However,such high concentration of alkali poses challenges including HMF degradation and high operation costs associated with product separation.Herein,we report a single-atom-ruthenium supported on Co3O4(Ru1-Co3O4)as a catalyst that works efficiently in a low-concentration alkaline electrolyte(0.1 mol L^(-1)KOH),exhibiting a low potential of 1.191 V versus a reversible hydrogen electrode to achieve 10 m A cm^(-2)in 0.1 mol L^(-1)KOH,which outperforms previous catalysts.Electrochemical studies demonstrate that single-atom-Ru significantly enhances hydroxyl(OH-)adsorption with insufficient OH-supply,thus improving HMF oxidation.To showcase the potential of Ru1-Co3O4catalyst,we demonstrate its high efficiency in a flow reactor under industrially relevant conditions.Eventually,techno-economic analysis shows that substitution of the conventional1.0 mol L^(-1)KOH with 0.1 mol L^(-1)KOH electrolyte may significantly reduce the minimum selling price of FDCA by 21.0%.This work demonstrates an efficient catalyst design for electrooxidation of biomass working without using strong alkaline electrolyte that may contribute to more economic biomass electro-valorization.
