CN101332423A - Production method of nano titanium dioxide photocatalysis plate - Google Patents

Abstract

The invention belongs to a production method of a nanometer TiO2 photocatalytic plate for polluted water treatment. At present, the TiO2 photocatalyst TiO2 film used for water treatment has poor cohesion and easily falls off in the application course, which reduces the photocatalysis efficiency and the water treatment effect. In the invention, nanometer TiO2 powder and a low-temperature ceramic glaze are mixed with the ratio of 3 - 4:1, and then added with 80 - 85% of water and 0.5 - 1.5% of sodium carboxymethyl cellulose (CMC) and uniformly mixed to make into a muddy mixture; the muddy mixture is uniformly sprayed on a ceramic plate in the form of mist; the ceramic plate is baked dry at the temperature of 80 - 100 DEG C, calcined in a high temperature furnace at the temperature of 500 - 600 DEG C, and insulated for one hour, and then is gradually cooled to the room temperature. The nanometer TiO2 photocatalytic plate prepared by the production method has the advantages of good effect in the photochemical decomposition of pollutants and long service life.

Description

A kind of nano-TiO 2The preparation method of photocatalysis plate

Technical field

The invention belongs to environmental protection technology, specifically a kind of nano-TiO that is used for the contaminant water processing ₂The preparation method of photocatalysis plate.

Background technology

Along with the development of progress of science and technology, chemical industry, the generation that has also brought the organic compound of some difficult degradations simultaneously.The extensive use of various anticorrisive agents, Insecticides (tech) ﹠ Herbicides (tech) etc. has promoted industrial and agricultural production, but has also caused certain harm to natural ecological environment.Some virulent organic matter has very strong inhibitory action to microorganism, have also by the soil water that permeates the ground, brought threat for people's normal life.Even have to the toxic effect of microorganism, cause and can't degrade effectively to it with biological method.Organic wastewater people for these contaminated environment make great efforts to adopt the whole bag of tricks to handle, and current people generally adopt oxidation technologies such as ultra-violet radiation, ozone, Fenton reagent (Fenton ' s Reagent) and photocatalysis to handle.By these methods, some organic compounds with labyrinth are transformed or degrade, change being easy to organic matter biodegradable or that toxicity is less into.Wherein adopt TiO ₂As photochemical catalyst organic wastewater with difficult degradation thereby being handled is one of new technology of current environment science.TiO ₂Penetrate down less than the illumination of 400nm at wavelength, the valence band electronics is excited to conduction band, formed electronics and hole to and move to the surface, with the compound generation redox that is adsorbed on the surface, generate the superoxide anion free radical, these free radicals have the function of photochemical decomposing organic pollutant.To carrying out subsequent treatment through the means of waste water reuse biological method behind the photocatalytic degradation, make these organic compounds obtain mineralising, change nontoxic material into.Photocatalysis is a kind of efficient ways of some hardly degraded organic substance being carried out advanced treating in conjunction with biological treatment.The TiO that is used for water treatment at present ₂The preparation method of photochemical catalyst is compound titanium solution to be soaked substrates such as glass, pottery or metal, and what have is dry at normal temperatures, for example the Chinese patent of application number 200410012965.9; After the employing gel coating that has, the oven dry again through high-temperature process, the Chinese patent of application number 200410060677.0 for example.On substrate, form TiO by immersion and gel coating ₂Film is made TiO ₂The photocatalysis plate.Existing TiO ₂The technology of preparing of photocatalysis plate has many shortcomings: at first because TiO ₂Character and the difference of various substrates, make TiO ₂The film tack is bad, in use comes off easily; Cause photocatalysis efficiency to reduce, the water treatment effect reduces, and has restricted photocatalysis technology applying in water treatment field.Next TiO ₂The photocatalysis plate life-span is short.The 3rd complex manufacturing technology is difficult to a large amount of industrial production.Therefore it is simple to invent a kind of making, TiO ₂Adhesion-tight, the effective nano-TiO of water treatment ₂The preparation method of photocatalysis plate is very valuable for handling poisonous waste water, protecting environment for human survival.

Based on the prior art present situation, the present invention proposes a kind of new nano-TiO ₂The preparation method of photocatalysis plate: with sodium rice TiO ₂Powder mixes with the low-temp ceramics glaze, adds the spraying of entry and bonding agent and is coated on the ceramic wafer, and oven dry, calcining are made.Through extensively retrieving domestic and international publication and patent documentation, yet there are no the nano-TiO identical with the present invention ₂The report of the preparation method of photocatalysis plate.

Goal of the invention

The purpose of this invention is to provide that a kind of method is easy, water treatment is effective, the sodium rice TiO that is used for the organic contamination water treatment of long service life ₂The preparation method of photocatalysis plate.

The present invention seeks to realize like this:

A kind of sodium rice TiO ₂The preparation method of photocatalysis plate may further comprise the steps:

(1) sodium rice TiO ₂Powder and low-temp ceramics glaze are according to 3～4: 1 ratio mixes;

(2) add 80～85% water of said mixture gross weight and the sodium carboxymethylcellulose (CMC) of 0.5-1.5% and make muddy;

(3) (2) even spraying is coated on the ceramic wafer, under 80～100 ℃ of conditions, dries;

(4) (3) were calcined 1 hour down at 500～600 ℃;

(5) (4) are slowly cooled to room temperature.

Main points of the present invention are: select the sodium rice TiO with catalytic activity for use ₂Powder (anatase crystal) and low-temp ceramics glaze are according to 3～4: 1 ratio also adds 80～85% water and the sodium carboxymethylcellulose of 0.5-1.5%, mix, make muddy, again it is nebulized equably and be sprayed on the ceramic wafer, after oven dry under 80～100 ℃ of conditions, place high temperature furnace again in 500～600 ℃ of calcinings down, after maximum temperature, be incubated 1 hour, allow it be cooled to room temperature lentamente then.

The TiO that the present invention selects for use ₂The powder particle diameter is the 1-100 nanometer, because particle is little, activity is good, so the photochemical decomposing organic pollutant of photocatalysis plate that makes is effective.Nano-TiO ₂Powder adopts conventional colloid mill grinding technique to make.The selected low-temp ceramics glaze of the present invention is common low-temp ceramics glaze, and its particle diameter is as far as possible little, is preferably the nano particle of 1-100 nanometer.

Because with TiO ₂Nanometer powder be sprayed on the ceramic matrix after glaze mixes, after 500～600 ℃ calcining, make TiO ₂Nanometer powder is attached on the ceramic matrix securely; Guaranteed TiO like this ₂Can not come off, thereby prolong its service life.

The present invention has following advantage: 1. owing to select nano-TiO for use ₂Powder particle, specific grain surface is long-pending big, and catalytic activity is good, can effectively improve the effect of photochemical decomposing organic pollutant.2. make full use of the firm characteristics of ceramic glaze and ceramic bonding, make nano-TiO ₂The powder adhesion-tight has prolonged photocatalysis plate service life greatly.3. nano-TiO ₂The photocatalysis board manufacturing method is simple, cost is low.

The present invention uses nano-TiO at home and abroad first ₂Powder particle and low-temp ceramics glaze mix ceramic coated substrate and make nano-TiO ₂The technology of photocatalysis plate has novelty and creativeness; The nano-TiO that the inventive method is made ₂Photocatalysis plate long service life, photochemical decomposing organic pollutant effective has practicality.Therefore the present invention has substantive technical characterstic.

The specific embodiment

Below by the specific embodiment the present invention is further elaborated.

Cut-off footpath 10 nano-TiOs ₂1 kilogram in powder adds 300 gram low-temp ceramics glaze and 15 gram sodium carboxymethylcelluloses (CMC) mix; Add 1.1 kg of water, add to mix well and make muddy; Above-mentioned muddy material even spraying is coated on 20 square metres of ceramic wafers; Put into 90 ℃ of constant temperature dryings of insulating box; The ceramic wafer of above-mentioned processing is put into baking oven, 500～600 ℃ of following high-temperature calcinations 1 hour; Take out and slowly cool to room temperature, nano-TiO at normal temperatures ₂The photocatalysis plate is made.

The nano-TiO that uses the inventive method to make ₂The photocatalysis plate has the effective of photochemical decomposing organic pollutant; The advantage of photocatalysis plate long service life.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have change and change.Within the spirit and principles in the present invention all, any modification of being done, improvement etc. all should be included within protection scope of the present invention.

Claims (1)

1. TiO ₂The preparation method of photocatalysis plate may further comprise the steps:

(1) sodium rice TiO ₂Powder and low-temp ceramics glaze are according to 3～4: 1 ratio mixes;

(2) sodium carboxymethylcellulose of 80～85% water of adding said mixture gross weight and 0.5-1.5% is made the muddy of suspended state;

(3) (2) even spraying is coated on the ceramic wafer, under 80～100 ℃ of conditions, dries;

(4) (3) were calcined 1 hour down at 500～600 ℃;

(5) (4) are slowly cooled to room temperature.