An intermediate temperature solid oxide fuel cell (IT-SOFC) includes an anode layer, an electrolyte adjacent to the anode layer, and a cathode layer adjacent to the electrolyte and including a material of formula (I) or (II): Sr.sub.2OsO.sub.4 (I) or Ba.sub.2MO.sub.4 (II), where M is a transition metal or post-transition metal.

Disclosed are molybdenum trioxide with a novel molecular structure and a chiral octahedral crystal phase structure, octamolybdate of the molybdenum trioxide and a preparation method of the octamolybdate. A molecular formula of -MoO.sub.3 with the novel molecular structure and the chiral octahedral crystal phase structure is Mo.sub.8O.sub.24, and the generated nano-molybdate based on the octamolybdate is a new species, so that a new member is added to inorganic salt chemical industry, and an application of the nano-molybdate changes all aspects of daily life of people, for example, the nano-molybdate having a disinfection function and insoluble in water is used in agricultural crop production and quality improvement, freshwater aquaculture and mariculture, sanitary disinfection, various anti-microbial and anti-tumor activities, batteries and various energy storages, semi-conductors, anti-biochemical weapons, intelligent materials and other aspects.

Disclosed are molybdenum trioxide with a novel molecular structure and a chiral octahedral crystal phase structure, octamolybdate of the molybdenum trioxide and a preparation method of the octamolybdate. A molecular formula of -MoO.sub.3 with the novel molecular structure and the chiral octahedral crystal phase structure is Mo.sub.8O.sub.24, and the generated nano-molybdate based on the octamolybdate is a new species, so that a new member is added to inorganic salt chemical industry, and an application of the nano-molybdate changes all aspects of daily life of people, for example, the nano-molybdate having a disinfection function and insoluble in water is used in agricultural crop production and quality improvement, freshwater aquaculture and mariculture, sanitary disinfection, various anti-microbial and anti-tumor activities, batteries and various energy storages, semi-conductors, anti-biochemical weapons, intelligent materials and other aspects.

Provided are the following: a mixture of visible light-responsive photocatalytic titanium oxide fine particles which can conveniently produce a photocatalyst thin film that exhibits photocatalyst activity even with only visible light (400-800 nm) and that exhibits high transparency; a dispersion liquid of the fine particles; a method for producing the dispersion liquid; a photocatalyst thin film; and a member having the photocatalyst thin film on a surface thereof. The mixture of visible light-responsive photocatalytic titanium oxide fine particles is characterized by containing two kinds of titanium dioxide fine particles: first titanium oxide fine particles, in which a tin component and a transition metal component (excluding an iron group element component) that increases visible light response properties form a solid solution, and second titanium oxide fine particles, in which an iron group element component and a chromium group element component form a solid solution.

The invention relates to a method for preparing amorphous molybdenum oxide adsorption material and an application thereof. The invention aims to solve the technical problem of low recovery efficiency of silver ions in coexisting silver-containing wastewater in the prior art. The method of the present invention includes: 1) preparation of electrolyte; and 2) subjecting to cyclic voltammetry. The amorphous molybdenum oxide adsorption material prepared by the present invention is used as an adsorbent for adsorbing and reducing silver ions in wastewater. The invention successfully prepares amorphous molybdenum oxide (MoOx) by cyclic voltammetry, which has a highly selective reduction adsorption for Ag.sup.+. Silver ions and the adsorbent MoOx could be subjected to redox reaction to remove silver ions in water. The removal efficiency of the silver ions in wastewater by the amorphous molybdenum oxide prepared by cyclic voltammetry of the invention is up to 99.85%.

The invention relates to a method for preparing amorphous molybdenum oxide adsorption material and an application thereof. The invention aims to solve the technical problem of low recovery efficiency of silver ions in coexisting silver-containing wastewater in the prior art. The method of the present invention includes: 1) preparation of electrolyte; and 2) subjecting to cyclic voltammetry. The amorphous molybdenum oxide adsorption material prepared by the present invention is used as an adsorbent for adsorbing and reducing silver ions in wastewater. The invention successfully prepares amorphous molybdenum oxide (MoOx) by cyclic voltammetry, which has a highly selective reduction adsorption for Ag.sup.+. Silver ions and the adsorbent MoOx could be subjected to redox reaction to remove silver ions in water. The removal efficiency of the silver ions in wastewater by the amorphous molybdenum oxide prepared by cyclic voltammetry of the invention is up to 99.85%.

A process for producing a metal oxide powder comprising: providing a precursor solution or dispersion containing a metal complex; spraying the precursor solution on to a heated substrate in the presence of water, thereby depositing material on the substrate; drying the deposited material; and removing the deposited material from the substrate to produce the metal oxide powder.

A process for producing a metal oxide powder comprising: providing a precursor solution or dispersion containing a metal complex; spraying the precursor solution on to a heated substrate in the presence of water, thereby depositing material on the substrate; drying the deposited material; and removing the deposited material from the substrate to produce the metal oxide powder.

Disclosed is a method for clean metallurgy of molybdenum, including steps: 1) roasting molybdenite with calcium to obtain calcified molybdenum calcine, and leaching the calcified molybdenum calcine with an inorganic acid to obtain a molybdenum-containing inorganic acid leachate; 2) extracting molybdenum in the leachate with a cationic extractant to obtain an organic phase loaded with molybdyl cations and a raffinate; 3) using a hydrogen peroxide solution as a stripping agent to obtain a molybdenum stripping liquor; and 4) heating the molybdenum stripping liquor to dissociate peroxymolybdic acid therein so as to form a molybdic acid precipitate, and then calcining to obtain a molybdenum trioxide product. The method solves the problem of ammonia nitrogen wastewater production and can also be used for the enrichment and recovery of rhenium.

A hollow fiber (HF) membrane incorporating molybdenum trioxide (MoO.sub.3) nanoparticles. The membrane may be composed of PPSU hollow fibers that are coated or encrusted with MoO.sub.3 nanoparticles and can be made by dry-wet spinning. The hollow fiber membranes containing MoO.sub.3 nanoparticles remove lead, cadmium or other heave metals from waste water and are resistant to attachment of bacteria and fouling.