49results about How to "Enhance photocatalytic hydrogen production activity" patented technology

A photocatalyst Pt-carried CdS / Ti-MCM-41 for generating H2 by optical catalytic reaction is prepared through providing CTAB as template agent, hydrothermal reaction to synthesize CTAB / Ti-MCM-41, ion exchange to obtain Cd / Ti-MCM-41, sulfurizing in HS gas to obtain CdS / Ti-MCM-41 and carrying Pt by optical reduction method. It has high H2 output rate.

The invention discloses a layered stromal HTiTaO5 / CdS Pt-carrying new-typed composite catalyst and making method, which comprises the following steps: mixing K2CO3, Ta2O5 and TiO2 at chemical gauge rate; sintering to obtain the KTiTaO5 product; proceeding KTiTaO5 to obtain catalyst layered stromal HTiTaO5 through nitric ion exchange; exchanging the stromal HTiTaO5 with saturated cadmium acetate ion through pile-supported propanamine; vulcanizing the exchanged stromal HTiTaO5 in the pipe-typed furnace hydrogen sulfide atmosphere at high temperature to produce HTiTaO5 / CdS; carrying Pt through photoreduction. The invention reaches the highest hydrogen-producing rate at 144umol / h and 6.3 percent quantum efficiency at 420 nm and 1.67 percent optical conversion efficiency for all-band of visible light, which improves the product activity.

The invention discloses a loaded photocatalyst NiSe / Mn 0.5 Cd 0.5 S and preparation method thereof, it is to adopt mild one-step hydrothermal method to synthesize Mn earlier 0.5 Cd 0.5 S solid solution, and then react it with nickel sulfate hexahydrate and sodium selenite. NiSe and Mn in the composite catalyst 0.5 Cd 0.5 S is closely combined to form a heterojunction, which is beneficial to the migration of photogenerated carriers and inhibits the recombination of photogenerated electrons and holes, making Mn 0.5 Cd 0.5 The photocatalytic hydrogen production activity of S solid solution was significantly improved. The novel NiSe / Mn that the present invention uses 0.5 Cd 0.5 S photocatalyst has the advantages of simple preparation, mass preparation, high photocatalytic activity and good stability, which makes it have broad application prospects in the development of clean energy.

A preparation method and application of cadmium sulfide nanosheets belong to the technical field of semiconductor photocatalytic material preparation. Specific process: 1) Place the cadmium salt in a small crucible, cover the pot, and place it in a large crucible; 2) Add thiourea into the large crucible until thiourea completely covers the small crucible; 3) Put the large crucible into Cover the pot and place it in a muffle furnace for calcination. The calcination temperature is 300°C and the holding time is 4h. After the reaction is completed, it is naturally cooled to room temperature and taken out; 4) The product obtained in the previous step is ground, washed and dried. , the cadmium sulfide nanosheets can be obtained. The method is obtained by calcining the solid precursor cadmium salt in the atmosphere of thiourea in the next step, without adding any organic or inorganic solution in the preparation process, the preparation conditions are mild, the operation is simple and convenient, and it is suitable for large-scale industrial production, and the obtained cadmium sulfide nanosheets The photocatalytic hydrogen production activity was significantly improved.

The invention relates to the field of photocatalysis. The invention discloses a composite photocatalyst and a preparation method thereof. The composite catalyst is a composite photocatalyst in which Ni@NiOx is used as a CdS co-catalyst. The preparation method is: synthesizing CdS nanowires with amino groups adsorbed on the surface ; Preparation of Ni / CdS composite photocatalyst; Preparation of Ni@NiOx / CdS composite photocatalyst: Ni@NiOx / CdS composite photocatalyst was obtained by calcining Ni / CdS composite photocatalyst at low temperature. The invention loads Ni on the surface of CdS through simple solvothermal reduction, and forms NiOx on the surface of Ni instead of CdS by low-temperature calcination, so as to reduce the hydrogen production overpotential of Ni and improve the photocatalytic hydrogen production activity. The raw materials used are easy to obtain, and the preparation method is simple. The material prepared by the present invention is applied to photocatalytic hydrogen production, and the photocatalytic hydrogen production efficiency of the composite sample is 104 times that of pure CdS.

The invention discloses a carbon dot / carbon nitride / titanium dioxide composite material which is formed by compounding of three-phase carbon dots, graphene-like carbon nitride and titanium dioxide, wherein carbon nitride has a large surface area so as to just provide a depositing space for titanium dioxide nanosheets, so that titanium dioxide cannot cluster; and meanwhile, carbon nitride has relatively narrow energy gap and can increase the light response range. Furthermore, compounding of photo-induced electrons can be further inhibited by utilizing the unique electron transfer capacity of carbon dots, so as to increase the photocatalytic capacity. Moreover, the preparation method is mild in process conditions and low in cost, and the composite material is suitable for large-scale production, and has wide application prospect.

The invention discloses a nickel carbonate-supported titanium dioxide ultraviolet light catalyst and a preparation method thereof. The light catalyst comprises the following raw materials in parts by weight: 1 part of titanium dioxide, 0.2-0.5 part of inorganic carbonate and 0.001-0.4 part of inorganic nickel salt. The method comprises the following steps: dissolving inorganic carbonate into water to obtain an inorganic carbonate water solution of which the molar concentration is 0.1-1.0mmol / L; dispersing titanium dioxide into the inorganic carbonate water solution to obtain a suspension; and finally, slowly adding the inorganic nickel salt into the suspension, stirring evenly, washing and standing, filtering by using filter paper, and drying in vacuum at 60-100 DEG C for 4-8 hours so as to obtain the nickel carbonate-supported titanium dioxide ultraviolet light catalyst. Compared with a traditional supporting technology that a supporter of a transition metal oxide needs to be calcined by using electric energy, the method does not have preparation cost and is free of electric energy] consumption; and the cost for preparing the light catalyst is increased by less than 1 yuan per 500g on the basis of the cost of titanium dioxide.