274results about How to "Wide absorption range" patented technology

The invention discloses a Bi / Aurivillius type oxide composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly weighing soluble bismuth salt and 6 coordinated metal compound according to a mole ratio of (2-2.2) to 1, then dissolving the soluble bismuth salt and the 6 coordinated metal compound in alcohols solvents to prepare corresponding alcohol solutions, then dropwise adding metal coordination compound into an alcohol solution of the bismuth salt, uniformly mixing and subsequently carrying out solvothermal reaction, centrifuging after the reaction is finished, washing and drying to prepare the Bi / Aurivillius type oxide composite material, wherein the metals in the coordinated metal compound is 6-coordinate. The composite material has the special layered structure of the Aurivillius material; the elemental bismuth reduced in situ is uniformly distributed in the layered material of Aurivillius; the electron-cavity separation is improved; the light absorption range of the material is expanded; the photo-catalytic efficiency of the material is improved.

The invention provides a preparation method for a photocatalyst used for treating volatile organic compounds. The preparation method is characterized in that titanium dioxide is used as a main active component, a transition metal is added as an auxiliary agent, and a normal temperature spraying process is employed to load titanium dioxide on a metal or ceramic honeycomb carrier. The preparation method comprises the following concrete steps: A) dissolving titanyl sulfate in deionized water, adjusting a pH value to 7 to 10 by using a 5 to 25% ammonia-water solution, subjecting an obtained white precipitate to centrifugation and washing, mixing and beating the precipitate and deionized water and adjusting the pH value to 7 to 10 by using H2O2 and HCl with stirring so as to obtain a titanium sol; B) adding a surfactant into the titanium sol, adding micro metal oxide powder with stirring, adding a binder and carrying out high-speed shearing and uniform stirring so as to prepare a stable coating solution; and C) uniformly spraying the coating solution on the carrier and drying and roasting the carrier so as to obtain a finished catalyst product. The catalyst prepared by using the method has the characteristics of high volatile organic compound removal efficiency, a long life, easy loading and unloading, a low price, etc.

The invention relates to a black ultraviolet-transmitting quartz tube which is prepared by using high purity quartz sand as basic raw materials in parts by weight, and compounding 0.5-4.0 parts by weight of colorant, wherein the colorant comprises sodium oxide (Na2O), sodium sulphate (Na2SO4), cuprous oxide (Cu2O), cobalt sesquioxide (Co2O3), manganese dioxide (MnO2), nickel oxide (NiO) and the like. The black ultraviolet-transmitting quartz tube molded by drawing through adopting a tube wall integral coloring preparation process has good uniformity and toughness, strong compression resistance and wide light absorption range. The cutoff wavelength thereof can reach 2100 nanometers, and the transmission rate is about 63 percent.

The invention discloses thermal-insulation mortar. The thermal-insulation mortar consists of the following components in percent by mass: 1%-5% of an absorbent, 25%-50% of cement, 10%-30% of filler, 35%-60% of lightweight aggregates, 0.2%-1% of a reinforced fiber and 1%-4% of organic auxiliaries. The thermal-insulation mortar disclosed by the invention has a wide wave-absorbing range, and has good absorbing effect on electromagnetic waves within a range of 26.5 GHz-40 GHz in addition to the range of 2 GHz-18 GHz.

The invention relates to an anti-counterfeiting material which comprises an upconversion luminescent nano-UCNPs material with a core-shell structure and an inorganic perovskite quantum dot IPQDs material. The UCNPs material can excite visible light by infrared light, and emission light covers a region from ultraviolet light to infrared light, while the IPQDs material has wide absorption range andcan be excited by ultraviolet-visible light, an emission spectrum has a narrow half-peak width, and the light-emitted color is pure. According to the anti-counterfeiting material, after the upconversion luminescent nanomaterial and the inorganic perovskite quantum dot material are mixed, the emission light of the inorganic perovskite quantum dots is only showed under infrared light excitation. Therefore, ultraviolet light is not required to be used as excitation light, and the interference of background fluorescence can be avoided when the anti-counterfeiting material is used for counterfeiting prevention on a paper base. The invention also provides a preparation method of the anti-counterfeiting material and an application for printing, spraying or printing counterfeiting prevention.

The invention discloses preparation of a Z-type BiVO4-Au / g-C3N4 photocatalytic material and application of the material to photocatalytic reduction of CO2. The photocatalytic material comprises the following synthesis steps: preparing g-C3N4 and BiVO4 correspondingly through a thermal polymerization urea method and a hydrothermal method, loading Au on the g-C3N4 by using an Au precursor solution through a photodeposition method, and mixing and calcining the BiVO4 and Au / g-C3N4 to obtain the Z-type BiVO4-Au / g-C3N4 photocatalytic material. The photocatalytic material is applied to a suspension system of CO2 and H2O, and CO2 can be reduced to obtain a product CH3OH by taking 300-W xenon lamp as a light source. The photocatalytic material has a high visible light absorbing property and high photo-induced electron-hole separation efficiency and has important significance in solving the problems of energy and environment by converting CO2 into hydrocarbon energy.