5results about How to "Broaden the response range" patented technology

This application belongs to the field of nanophotocatalytic materials technology, and discloses a mesoporous TiO2 / coumarin-doped graphitic carbon nitride (CM-CN) composite photocatalyst, its preparation method, and its application. The invention first uses a crystallization-driven single-colloidal assembly method to prepare TiO2 particles with a uniform mesoporous structure. Then, dihydroxycoumarin is mixed with urea using a thermal polycondensation method and calcined at high temperature to obtain CM-CN. Next, CM-CN and mesoporous TiO2 are self-assembled in a solvent using a solvent dispersion-promoting technique to obtain the mesoporous TiO2 / CM-CN composite photocatalyst. This mesoporous TiO2 / CM-CN composite photocatalyst possesses a hierarchical pore structure, high specific surface area, excellent hydrophilicity, and strong interfacial bonding, achieving efficient transfer and separation of photogenerated carriers, and enabling the construction of a green, stable, and highly active photocatalytic system. The material preparation process is simple, the raw material cost is controllable, there is no secondary pollution, and the photocatalytic performance is significant, showing good potential for large-scale production and widespread application.

This application discloses a current calibration loop and method for current calibration of a current-controlled DAC. The current calibration loop includes: a selected reference current source and a selected current source to be calibrated; a clamping management module that clamps the output nodes of the two sources to the same fixed potential to discharge the static current of the two output nodes in different calibration modes, retaining only the current difference; an error comparison module that amplifies the current difference into a voltage difference and outputs the comparison result; a calibration control logic module that generates a calibration control signal based on the comparison result; and a calibration module that injects error compensation current into the output nodes according to the calibration control signal, so that the compensated output current of the selected current source to be calibrated is equal to the reference current provided by the selected reference current source. By discharging most of the static current and retaining only the current difference for comparison, it can respond promptly to a wide current range, significantly improve the current calibration accuracy, and adapt to various calibration modes.

The invention discloses a preparation method of a photocatalyst material, and belongs to the technical field of material preparation and pollution treatment. The method comprises the following steps: by taking bismuth citrate as a multifunctional precursor, firstly mixing the bismuth citrate with a titanium source, a manganese source and a cerium source in a solvent for gelation, then carrying out solvothermal reaction to form an intermediate, and finally carrying out programmed temperature control pyrolysis in an inert and oxygen-containing atmosphere. In the pyrolysis process, carbon element doping and manganese and cerium bimetal ion lattice embedding are synchronously realized, and a graded porous folded structure is constructed in situ by utilizing precursor decomposition gas. The method integrally solves the problems of weak visible light response, low mass transfer efficiency and poor stability of a traditional material, and the prepared material shows efficient inhibition and degradation efficiency on mold such as aspergillus flavus under simulated granary low-illumination visible light.

The application relates to the technical field of photocatalytic material preparation, and discloses a preparation method of calcium hydroxystannate material based on morphology reconstruction to enhance intrinsic light absorption, which comprises the following steps: firstly, a regular polyhedral calcium hydroxystannate precursor powder is prepared by adopting a liquid phase precipitation method; subsequently, deionized water and anhydrous ethanol are mixed to construct a solvent cage medium, and a low-concentration etching working solution is prepared by adding an organic weak acid; the precursor is added into the working solution for constant-speed stirring, morphology reconstruction is carried out on the crystal surface by using the solvent cage shielding effect and acid etching effect, and solid-liquid separation is carried out immediately after the reaction is completed; the obtained precipitate is washed and dried to obtain the calcium hydroxystannate material with a surface micro-rough structure. Through a mild and limited etching process, a defect layer rich in oxygen vacancies is constructed in situ on the crystal surface, the micro-morphology is reconstructed into an octagonal shape, the band gap width is effectively reduced, the light absorption edge is red-shifted, carrier recombination is inhibited, and therefore the photocatalytic mineralization performance of the material under visible light is improved.

This invention belongs to the field of air purification materials technology, specifically relating to a high-purity spherical zinc oxide-silica synergistic photocatalytic air purification material. By weight, it comprises 100 parts of silica-coated high-purity spherical zinc oxide, 1-3 parts of a silanized porphyrin trifluoromethyl functional polymer, 2400-2950 parts of ethanol, 101.5-204 parts of deionized water, and 0.006-0.06 parts of glacial acetic acid. The high-purity spherical zinc oxide-silica synergistic photocatalytic air purification material prepared by this invention exhibits improved interface stability, a broadened spectral response range, and pollutant degradation capabilities.