2647 results about "Photo catalytic" patented technology

The invention relates to a method for preparing a graphite-phase carbon nitride (g-C3N4) material. The method includes the steps that a carbon nitride precursor and ammonium salt are evenly mixed, and then calcination is conducted so that the porous g-C3N4 material can be obtained. The ammonium salt is any one of ammonium base salts capable of generating ammonia gas through thermal decomposition or is the combination of at least two of the ammonium base salts. In the preparation process of the g-C3N4 material, the ammonium salt is added into the carbon nitride precursor to be mixed. In the high-temperature calcining process, the ammonium salt is subjected to pyrogenic decomposition to generate gas, a pore-forming effect on the g-C3N4 material is achieved, and the cellular porous g-C3N4 material is obtained. In the preparation process of the g-C3N4 material, template agents are not used, and thus the method is simple, efficient and environmentally friendly; the prepared g-C3N4 material is high in photocatalytic activity and can be used in the pollution control processes such as exhaust gas and wastewater treatment.

The invention provides a TiO2 / C hybrid aerogel modified polyvinylidene fluoride membrane. The TiO2 / C hybrid aerogel modified polyvinylidene fluoride membrane consists of PVDF, a pore-foaming agent, TiO2 / C hybrid aerogel and an organic solvent. The invention also provides a preparation method of the TiO2 / C hybrid aerogel modified polyvinylidene fluoride membrane. The method comprises the steps of preparing membrane casting solution firstly, mechanically stirring the membrane casting solution in a thermostat water bath to fully dissolve PVDF, standing and defoaming the membrane casting solution for membrane scraping, scraping the membrane casting solution on a glass plate by a glass rod to form a membrane, exposing the glass plate in air, soaking the glass plate in coagulating bath to form the membrane by immersion precipitation phase inversion, soaking the prepared membrane in distilled water for 5-8 days, taking out and airing to obtain the membrane. According to the TiO2 / C hybrid aerogel modified polyvinylidene fluoride membrane, the TiO2 / C hydrophilic composite material is added on the surface of the PVDF ultrafiltration membrane, so that the hydrophilcity of the PVDF ultrafiltration membrane is effectively improved, the energy consumption is greatly reduced, the TiO2 / C can be adopted for photocatalytic degradation of organic matters and the service life of the membrane is prolonged.

The invention discloses a bismuth ferrite-graphene compounding photochemical catalyst with visible light responds, and a preparation method of the bismuth ferrite-graphene compounding photochemical catalyst. The catalyst prepared by the method comprises the following components according to mass percentage: 60-95% of bismuth ferrite and 5-40% of graphene. The preparation method is characterized in that the reduction of graphite oxide and the compounding of the bismuth ferrite and the graphene are finished by one step, and the catalyst prepared by the method has relatively high magnetism and good visible light responds. When the catalyst prepared by the method is used for treating methylthionine chloride solution by using visible light catalysis, a relatively good degradation effect can be obtained. Therefore, the invention has significance in the development of the visible light catalyst, and the visible light catalyst has a good application prospect when being used for sewage treatment.