Long-effect water-purifying material and preparation method thereof

Abstract

The invention provides a long-effect water-purifying material and a preparation method thereof. A silicon dioxide sol aqueous solution is preformed, and a silver-containing titanium oxide precursor solution is added into the silicon dioxide sol aqueous solution in order that the hydrolyzing process of a titanium oxide precursor and the generation of titanium oxide particles are limited by a silicon dioxide sol network, thereby controlling the excessive growth of the titanium oxide particles. The prepared nano titanium dioxide is less than 3 nm in particle size, has high catalyzing activity, and is stable in dispersion. Through further combination with a coarse or porous carrier, uniform loading of the nano titanium dioxide particles is realized. Moreover, the long-effect water-purifying material has the effects of keeping water to be treated and adsorbing pollutants, so that higher catalytic purification efficiency is achieved.

Description

technical field [0001] The invention belongs to the field of water body purification and treatment, and in particular relates to a long-acting water purification material and a preparation method thereof. Background technique [0002] Human production and life will discharge a large amount of industrial, agricultural and domestic waste into the water, polluting the water. At present, more than 420 billion cubic meters of sewage are discharged into rivers, lakes and seas in the world every year, polluting 5.5 trillion cubic meters of fresh water, which is equivalent to more than 14% of the total global runoff. Acids, alkalis, oxidants in water, as well as compounds such as copper, cadmium, mercury, and arsenic, and organic poisons such as benzene, dichloroethane, and ethylene glycol will poison aquatic organisms to death and affect drinking water sources. When the organic matter in the sewage is decomposed by microorganisms, the oxygen in the water is consumed, which affects...

AI Technical Summary

Problems solved by technology

[0004] 1. The particle size of the prepared titanium dioxide is relatively large, generally 5-100 nanometers, its specific surface area is small, the number of surface atoms is small, and the surface effect of ultrafine particles is not significant. On the one hand, the less light energy absorbed, the e- and The smaller the density of h+ pairs, on the other hand, the less reactants are adsorbed, and the concentration of oxidized or reduced substances is also less, so the visible light catalytic activity will decrease.

[0005] 2. High manufacturing cost, low processing effect and slow processing speed, which directly lead to increased processing cost and greatly reduced economic value

[0006] 3. Large particle size and low adhesion, the application field is limited

[0007] In addition, although there are many literatures that propose the use of various metal doping methods to improve TiO 2 Photocatalytic activity, such as copper doping, cobalt doping, nickel doping, etc., but on the one hand, although these doping methods have shown a certain improvement in laboratory testing, due to the complexity of the actual use environment, It is also easy to further reunite, and the actual lifting effect produced in it is limited. On the other hand, most of these doping elements are harmful to the human body, and may cause secondary pollution to water quality during use