57results about How to "Improve visible light photocatalytic activity" patented technology

The invention discloses a novel photocatalytic material based on Cu and Ag. The material can be expressed by CuxAg(1-x) / (CuyAg(1-y))2O / Ag3PO4 / TiO2, wherein 0<x and y<=1. Based on the preparation of TiO2 nanowires by a hydrothermal method, the novel photocatalytic material CuxAg(1-x) / (CuyAg(1-y))2O / Ag3PO4 / TiO2 with a large specific surface area is obtained by modifying CuxAg(1-x), (CuyAg(1-y))2O nanoparticles and bulk Ag3PO4. The novel photocatalytic material has good photocatalytic performance.

The invention relates to a single-step hydrothermal micro-emulsion method for preparing iron-doped nano titanium dioxide powder. The single-step hydrothermal micro-emulsion method specifically comprises the following steps of constituting water-in-oil W / O type micro-emulsion by using alkylphenol ethoxylates (OP-10) as a surfactant, using n-butyl alcohol (C4H9OH) as a cosurfactant, using cyclohexane (C6H12) as an oil phase, using butyl titanate (Ti(OC4H9)4) as a titanium source and using hydrochloric acid (HCl) liquor of ferric chloride (FeCl3.6H2O) as a water phase; uniformly stirring, and transferring into a lined polytetrafluoroethylene reaction kettle for keeping heat for 1 hour-5 hours at a constant temperature of 120 DEG C-160 DEG C, naturally cooling to the room temperature; and washing, separating and drying to prepare the iron-doped nano titanium dioxide powder. According to the single-step hydrothermal micro-emulsion method disclosed by the invention, the iron-doped titanium dioxide is obtained by directly reacting in a low-temperature liquid phase, the preparation process is simple, and the prepared iron-doped nano TiO2 powder is controllable in dimension, uniform in size and provided with average diameter of 10 nm-25 nm; moreover, the iron-doped nano TiO2 powder is expected to be widely applied in the fields such as hydrogen production by photodecomposition of water, degradation of organic pollutants, and the like.

The invention belongs to the field of preparation of catalysts containing metals, in particular to a Ta 3 N 5 / CdS heterojunction fiber photocatalyst and its preparation method. The method adopts electrospinning method combined with hydrothermal reaction to prepare Ta 3 N 5 / CdS heterojunction fiber photocatalysts, including Ta 3 N 5 Spinning solution preparation steps, Ta 2 o 5 Fiber preparation steps, Ta 3 N 5 Nanofiber preparation steps, hydrothermal reaction system preparation steps, hydrothermal reaction and subsequent treatment steps. The preparation method of the present invention makes CdS nanoparticles uniformly wrap Ta 3 N 5 Nanofibers, the two are evenly and fully compounded, which is conducive to improving photocatalytic activity, stable properties, and easy recycling; the preparation method is simple, the equipment and other costs are relatively cheap, and the experimental conditions are controllable, which is conducive to large-scale production and preparation.