The interfacial reactions of chalcopyrite in ammonia–ammonium chloride solution were investigated.The chalcopyrite surface was examined by scanning electron microscopy and X-ray photoelectron spectroscopy(XPS)techniq...The interfacial reactions of chalcopyrite in ammonia–ammonium chloride solution were investigated.The chalcopyrite surface was examined by scanning electron microscopy and X-ray photoelectron spectroscopy(XPS)techniques.It was found that interfacial passivation layers of chalcopyrite were formed from an iron oxide layer on top of a copper sulfide layer overlaying the bulk chalcopyrite,whereas CuFe1-xS2 or copper sulfides were formed via the preferential dissolution of Fe.The copper sulfide layer formed a new passivation layer,whereas the iron oxide layer peeled off spontaneously and partially from the chalcopyrite surface.The state of the copper sulfide layer was discussed after being deduced from the appearance of S2-,S22-,Sn2-,S0 and SO42-.A mechanism for the oxidation and passivation of chalcopyrite under different pH values and redox potentials was proposed.Accordingly,a model of the interfacial reaction on the chalcopyrite surface was constructed using a three-step reaction pathway,which demonstrated the formation and transformation of passivation layers under the present experimental conditions.展开更多
The crystal structure,physical,chemical and phase transition properties of trititanium pentoxide(Ti_(3)O_5)have aroused a broad range of research effort since the 1950s.Different crystalline forms(α,β,γ,δandλ)of ...The crystal structure,physical,chemical and phase transition properties of trititanium pentoxide(Ti_(3)O_5)have aroused a broad range of research effort since the 1950s.Different crystalline forms(α,β,γ,δandλ)of Ti_(3)O_5 exhibit various properties.Particularly,reversible phase transitions betweenλ-andβ-Ti_(3)O_5 have been attracting increasing research interest,which brings new potential applications of Ti_(3)O_5 materials in the field of energy and data storage.More recently,Ti_(3)O_5 materials have shown excellent performance in trace detection,microwave absorption and virus adsorption,which has expanded its application fields.Here,the essential properties of different crystal forms of Ti_(3)O_5 are described in detail.An intensive overview of Ti_(3)O_5 preparation methods and applications is comprehensively summarized.展开更多
基金Project(2014CB643405)supported by the National Basic Research Program of China
文摘The interfacial reactions of chalcopyrite in ammonia–ammonium chloride solution were investigated.The chalcopyrite surface was examined by scanning electron microscopy and X-ray photoelectron spectroscopy(XPS)techniques.It was found that interfacial passivation layers of chalcopyrite were formed from an iron oxide layer on top of a copper sulfide layer overlaying the bulk chalcopyrite,whereas CuFe1-xS2 or copper sulfides were formed via the preferential dissolution of Fe.The copper sulfide layer formed a new passivation layer,whereas the iron oxide layer peeled off spontaneously and partially from the chalcopyrite surface.The state of the copper sulfide layer was discussed after being deduced from the appearance of S2-,S22-,Sn2-,S0 and SO42-.A mechanism for the oxidation and passivation of chalcopyrite under different pH values and redox potentials was proposed.Accordingly,a model of the interfacial reaction on the chalcopyrite surface was constructed using a three-step reaction pathway,which demonstrated the formation and transformation of passivation layers under the present experimental conditions.
基金financial supports from the National Natural Science Foundation of China(Nos.52004157,U1860203,52022054,51974181)the Shanghai Sailing Program,China(No.21YF1412900)+5 种基金the Shanghai Rising-Star Program,China(No.19QA1403600)the Shanghai Engineering Research Center of Green Remanufacture of Metal Parts,China(No.19DZ2252900)the Program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learning,China(No.TP2019041)the“Shuguang Program”supported by the Shanghai Education Development Foundation and the Shanghai Municipal Education Commission,China(No.21SG42)the Independent Research and Development Project of State Key Laboratory of Advanced Special Steel,Shanghai Key Laboratory of Advanced Ferrometallurgy,Shanghai University,China(No.SKLASS 2020-Z10)the Science and Technology Commission of Shanghai Municipality,China(No.19DZ2270200).
文摘The crystal structure,physical,chemical and phase transition properties of trititanium pentoxide(Ti_(3)O_5)have aroused a broad range of research effort since the 1950s.Different crystalline forms(α,β,γ,δandλ)of Ti_(3)O_5 exhibit various properties.Particularly,reversible phase transitions betweenλ-andβ-Ti_(3)O_5 have been attracting increasing research interest,which brings new potential applications of Ti_(3)O_5 materials in the field of energy and data storage.More recently,Ti_(3)O_5 materials have shown excellent performance in trace detection,microwave absorption and virus adsorption,which has expanded its application fields.Here,the essential properties of different crystal forms of Ti_(3)O_5 are described in detail.An intensive overview of Ti_(3)O_5 preparation methods and applications is comprehensively summarized.
