CN102580713A - Method for preparing titanium dioxide/silicate mineral nano composites - Google Patents
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Abstract
The invention relates to a method for preparing titanium dioxide/silicate mineral nano composites. The method comprises the following steps of: firstly, adding silicate minerals to a titanium tetrachloride solution to activate the silicate minerals and dissolve foreign ions; secondly, adding a certain alkaline solution to convert titanium ions to titanium dioxide hydrate precipitates and washing off other foreign ions to obtain titanium dioxide hydrate/silicate mineral complex filter cakes; and thirdly, adding the filter cakes to the titanium tetrachloride solution, adopting the acid environment of the titanium tetrachloride solution to realize dissolution of the titanium dioxide hydrates, secondary activation of the silicate minerals and low temperature crystallization and growth of nano titanium dioxide on the silicate minerals and carrying out filtering, washing, drying and grinding, thus finally preparing the titanium dioxide/silicate mineral nano composites. The method has the following advantages that the method is simple and practical in steps; the reaction conditions are mild; the raw materials are simple and have low cost; and the method is suitable for large-scale production and can be beneficial to effective improvement of the photocatalytic efficiency of titanium dioxide.
Description
Technical field
The present invention relates to the preparation method of a kind of titanium dioxide/silicate mineral nano composite material.
Background technology
Nano titanium oxide is a kind of typical photochemical catalyst, has advantages such as catalytic activity height, chemical property be stable, nontoxic, safe in utilization, and wide application prospect is arranged in wastewater treatment.Yet in the actual use of nano titanium oxide, exist shortcomings such as bad dispersibility, recovery difficulty, thereby limited its industrialized application.In recent years; Utilize various preparing carriers load type titania photocatalysts to receive much concern, wherein silicate mineral has reserves are abundant, cheap, specific area is big, excellent absorption property as carrier of photocatalyst and is prone to advantage such as recovery and has obtained extensive use.Chinese patent CN1970149A discloses a kind of bergmeal particle loaded nano TiO
2The preparation method, earlier with dilute sulfuric acid acid treatment diatomite, the smart soil that makes is dispersed in the urea liquid; Add titanyl sulfate solution then; Water-bath heating mixed liquor obtains the compound slurries, 300～800 ℃ of calcinings down, makes bergmeal particle loaded nano TiO at last
2Product.The weak point of this method is: use dilute sulfuric acid to handle original soil, the waste liquor contamination environment of generation increases if deal with cost in addition; Calcine the back nano-titania particle and be prone to reunite, thereby influence the photocatalysis effect and recycle value not high.Chinese patent CN101607194A discloses a kind of preparation method of anatase type titanium dioxide/montmorillonite nano composite material, and this method uses titanate esters to do the titanium source, costs an arm and a leg, and the preparation process has been used a large amount of organic solvents, is unfavorable for environmental protection.
Summary of the invention
In view of the existing problem of background technology; The object of the present invention is to provide a kind of titanium dioxide/silicate mineral nano composite material and the preparation method; The raw material sources that prepare this composite are abundant, cheap, and this method preparation technology is simple and can effectively improve optically catalytic TiO 2 efficient.
The present invention provides the preparation method of a kind of titanium dioxide/silicate mineral nano composite material, comprises the steps:
1, at first silicate mineral is added titanium tetrachloride solution, the hydrochloric acid that utilizes the titanium tetrachloride solution hydrolysis to produce carries out activation and dissolved impurity ion to silicate mineral;
2, add certain alkaline solution then the titanium ion in the solution is converted into the titanium dioxide hydrates deposition, other foreign ions of flush away obtain titanium dioxide hydrates/silicate mineral complex filter cake;
3, again filter cake is added in the titanium tetrachloride solution; The sour environment that utilizes the titanium tetrachloride solution hydrolysis to produce is realized dissolving, the re-activation of silicate mineral, the low temperature crystallized and growth of nano titanium oxide on silicate mineral of titanium dioxide hydrates; Filtration, washing, dry, pulverizing make titanium dioxide/silicate mineral nano composite material at last.
As preferably, the present invention provides the preparation method of a kind of titanium dioxide/silicate mineral nano composite material, (the titanium dioxide: be 0.2～1: 1 silicate mineral) of the mass ratio of titanium dioxide and silicate mineral in the composite.The preparation method of this composite comprises the steps:
1, silicate mineral is added in the titanium tetrachloride solution of 0.5～3.0 mol, flooded under the room temperature 3～60 hours, obtain titanium dioxide precursor/silicate mineral slurries;
2, the temperature of the titanium dioxide precursor/silicate mineral slurries of regulating step 1 gained is 10～50 ℃; Stir on one side; The pH value that adds the alkaline solution regulation system of 0.5～4.0 mol on one side is 1.6～3.0; Filter, washing obtains titanium dioxide hydrates/silicate mineral complex filter cake to the electrical conductivity≤200 μ S/cm of filtrating;
3, the titanium dioxide hydrates/silicate mineral complex filter cake with step 2 gained adds in the titanium tetrachloride solution of 0.2～1.0 mol; Be warming up to 60～100 ℃; Insulated and stirred reaction 1～12 hour; Using the pH value of the alkaline solution regulation system of 1.0～4.0 mol is 6.5～7.5, obtains titanium dioxide/silicate mineral nano composite material slurries;
4, with the composite dope filtration of step 3 gained, wash, 60-180 ℃ of drying pulverized, and promptly gets titanium dioxide/silicate mineral nano composite material powder.
Silicate mineral described in the step 1 is a kind of in attapulgite, imvite, diatomite, sepiolite, mica, talcum, rectorite, illite, pyrophillite, the expanded perlite.
Described titanium tetrachloride solution consumption is by the quality of titanium dioxide that its complete reaction generates, and titanium dioxide and silicate mineral quality are than (titanium dioxide: be 0.1～0.8: 1 silicate mineral) in the step 1; Titanium dioxide and silicate mineral quality are than (titanium dioxide: be 0.1～0.2: 1 silicate mineral) in the step 3.
Step 2, the alkaline solution described in 3 are a kind of in sodium hydroxide solution, potassium hydroxide solution, the ammoniacal liquor.
The invention has the advantages that:
1, utilize in the step 1 hydrochloric acid that the titanium tetrachloride solution hydrolysis produces the part solubility in acid impurity in the silicate mineral with the ionic species stripping; Cation exchanges in titanium ion and the silicate mineral simultaneously; Increase the specific area and the absorption property of clay, improved load capacity; Titanium tetrachloride has not only been practiced thrift cost but also has been reduced the pollution to environment simultaneously as titanium source and acid source.
2, titanium ion is converted into the titanium dioxide hydrates deposition fully in step 2 system; Foreign ion does not form the indissoluble thing simultaneously; Can remove foreign ion fully through repeatedly washing; Eliminated the influence of impurity on the one hand, be the low temperature crystallized condition of having created of next step nano titanium oxide on the other hand composite photocatalysis effect.
3, in the step 3 titanium tetrachloride solution is added in the filter cake after washing; The sour environment that utilizes titanium tetrachloride hydrolysis to produce is realized dissolving, the re-activation of silicate mineral, the low temperature crystallized and growth of nano titanium oxide on silicate mineral of titanium dioxide hydrates; Saved and added sour step, under temperate condition, prepared highly active titanium dioxide/silicate mineral nano composite material.
4, the method for the invention step is simple, and reaction condition gentleness and raw material are simple, and be cheap, is fit to large-scale production, and can effectively improves optically catalytic TiO 2 efficient.
The specific embodiment
Below in conjunction with embodiment and comparative example, the present invention is done further description, but does not limit the scope of the invention extremely:
Embodiment 1: 10 kilograms of attapulgite powders are added in the titanium tetrachloride solution of 30 liter of 2.0 mol, dipping is 24 hours under the room temperature, obtains titanium dioxide precursor/attapulgite slurry.The temperature of control titanium dioxide precursor/attapulgite slurry is 30 ℃; Stir on one side; In slurries, add the sodium hydroxide solution of 2.0 mol on one side, when the pH of system value reaches 2.5, filter; Washing to the electrical conductivity of filtrating is 150 μ S/cm, obtains titanium dioxide hydrates/attapulgite clay compounded body filter cake.Filter cake is added in the titanium tetrachloride solution of 30 liter of 0.5 mol, be warming up to 80 ℃, the insulated and stirred reaction is after 4 hours; The pH value of using the sodium hydroxide solution regulation system of 2.0 mol is 7.0; Filter washing, 60 ℃ of dryings; Pulverize, obtain titanium dioxide/attapulgite clay nano composite material powder.Titanium dioxide is the mixed crystal of anatase and rutile in the nano composite material; Wherein anatase content is 54%, and crystallite dimension is 6.3nm, and rutile content is 46%; Crystallite dimension is 8.0nm, the mass ratio of titanium dioxide and attapulgite (titanium dioxide: attapulgite) be 0.6: 1.
Embodiment 2: 10 kilograms of attapulgite powders are added in the titanium tetrachloride solution of 25 liter of 0.5 mol, dipping is 60 hours under the room temperature, obtains titanium dioxide precursor/attapulgite slurry.The temperature of control titanium dioxide precursor/attapulgite slurry is 10 ℃; Stir on one side; In slurries, add the potassium hydroxide solution of 4.0 mol on one side, when the pH of system value reaches 1.6, filter; Washing to the electrical conductivity of filtrating is 105 μ S/cm, obtains titanium dioxide hydrates/attapulgite clay compounded body filter cake.Filter cake is added in the titanium tetrachloride solution of 62.5 liter of 0.2 mol, be warming up to 100 ℃, the insulated and stirred reaction is after 1 hour; The pH value of using the potassium hydroxide solution regulation system of 4.0 mol is 6.5; Filter washing, 80 ℃ of dryings; Pulverize, obtain titanium dioxide/attapulgite clay nano composite material powder.Titanium dioxide is the mixed crystal of anatase and rutile in the nano composite material; Wherein anatase content is 48%, and crystallite dimension is 6.5nm, and rutile content is 52%; Crystallite dimension is 8.2nm, the mass ratio of titanium dioxide and attapulgite (titanium dioxide: attapulgite) be 0.2: 1.
Embodiment 3: 10 kilograms of attapulgite powders are added in the titanium tetrachloride solution of 33.3 liter of 3.0 mol, dipping is 3 hours under the room temperature, obtains titanium dioxide precursor/attapulgite slurry.The temperature of control titanium dioxide precursor/attapulgite slurry is 50 ℃; Stir on one side; In slurries, add the ammoniacal liquor of 0.5 mol on one side, when the pH of system value reaches 3.0, filter; Washing to the electrical conductivity of filtrating is 200 μ S/cm, obtains titanium dioxide hydrates/attapulgite clay compounded body filter cake.Filter cake is added in the titanium tetrachloride solution of 25 liter of 1.0 mol, be warming up to 60 ℃, the insulated and stirred reaction is after 12 hours; The pH value of using the ammoniacal liquor regulation system of 0.5 mol is 7.5, filters washing; 120 ℃ of dryings are pulverized, and obtain titanium dioxide/attapulgite clay nano composite material powder.Titanium dioxide is the mixed crystal of anatase and rutile in the nano composite material; Wherein anatase content is 60%, and crystallite dimension is 6.9nm, and rutile content is 40%; Crystallite dimension is 8.8nm, the mass ratio of titanium dioxide and attapulgite (titanium dioxide: attapulgite) be 1: 1.
Embodiment 4: 10 kilograms of calcium-base montmorillonite powders are added in the titanium tetrachloride solution of 32 liter of 1.0 mol, dipping is 45 hours under the room temperature, obtains titanium dioxide precursor/montmorillonite slurry.The temperature of control titanium dioxide precursor/montmorillonite slurry is 20 ℃; Stir on one side; In slurries, add the sodium hydroxide solution of 3.5 mol on one side, when the pH of system value reaches 2.0, filter; Washing to the electrical conductivity of filtrating is 125 μ S/cm, obtains titanium dioxide hydrates/montmorillonite Composite body filter cake.Filter cake is added in the titanium tetrachloride solution of 30 liter of 0.6 mol, be warming up to 90 ℃, the insulated and stirred reaction is after 2 hours; The pH value of using the sodium hydroxide solution regulation system of 3.5 mol is 6.8; Filter washing, 140 ℃ of dryings; Pulverize, obtain titanium dioxide/Nano composite material of montmorillonite powder.Titanium dioxide is the mixed crystal of anatase and rutile in the nano composite material; Wherein anatase content is 51%, and crystallite dimension is 6.4nm, and rutile content is 49%; Crystallite dimension is 8.1nm, the mass ratio of titanium dioxide and imvite (titanium dioxide: imvite) be 0.4: 1.
Embodiment 5: 10 kilograms of diatomite powders are added in the titanium tetrachloride solution of 32.6 liter of 2.3 mol, dipping is 12 hours under the room temperature, obtains titanium dioxide precursor/diatomite slurries.The temperature of control titanium dioxide precursor/diatomite slurries is 35 ℃; Stir on one side; In slurries, add the potassium hydroxide solution of 1.5 mol on one side, when the pH of system value reaches 2.7, filter; Washing to the electrical conductivity of filtrating is 180 μ S/cm, obtains the fit filter cake of titanium dioxide hydrates/tripolite compound.Filter cake is added in the titanium tetrachloride solution of 31.25 liter of 0.8 mol, be warming up to 70 ℃, the insulated and stirred reaction is after 8 hours; The pH value of using the potassium hydroxide solution regulation system of 1.5 mol is 7.2; Filter washing, 180 ℃ of dryings; Pulverize, obtain titanium dioxide/diatomite nano composite material powder.Titanium dioxide is the mixed crystal of anatase and rutile in the nano composite material; Wherein anatase content is 57%, and crystallite dimension is 6.7nm, and rutile content is 43%; Crystallite dimension is 8.5nm, titanium dioxide and diatomaceous mass ratio (titanium dioxide: diatomite) be 0.8: 1.
Embodiment 6: external except that changing the attapulgite powder into sepiolite powder in embodiment 6, other technological parameters are all identical with embodiment 1 with method of operating, obtain titanium dioxide/sepiolite nano composite material powder.Titanium dioxide is the mixed crystal of anatase and rutile in the nano composite material; Wherein anatase content is 54%, and crystallite dimension is 6.2nm, and rutile content is 46%; Crystallite dimension is 8.1nm, the mass ratio of titanium dioxide and sepiolite (titanium dioxide: sepiolite) be 0.6: 1.
Embodiment 7: except that the attapulgite powder is changed into the mica powder, other technological parameters are all identical with embodiment 1 with method of operating in embodiment 7, obtain titanium dioxide/mica nano composite material powder.Titanium dioxide is the mixed crystal of anatase and rutile in the nano composite material; Wherein anatase content is 53%, and crystallite dimension is 6.4nm, and rutile content is 47%; Crystallite dimension is 8.2nm, the mass ratio of titanium dioxide and mica (titanium dioxide: mica) be 0.6: 1.
Embodiment 8: except that the attapulgite powder is changed into the talcum powder, other technological parameters are all identical with embodiment 1 with method of operating in embodiment 8, obtain titanium dioxide/talcum nano composite material powder.Titanium dioxide is the mixed crystal of anatase and rutile in the nano composite material; Wherein anatase content is 55%, and crystallite dimension is 6.5nm, and rutile content is 45%; Crystallite dimension is 8.4nm, the mass ratio of titanium dioxide and talcum (titanium dioxide: talcum) be 0.6: 1.
Embodiment 9: except that the attapulgite powder is changed into the rectorite powder, other technological parameters are all identical with embodiment 1 with method of operating, obtain titanium dioxide/rectorite nano composite material powder in embodiment 9.Titanium dioxide is the mixed crystal of anatase and rutile in the nano composite material; Wherein anatase content is 54%, and crystallite dimension is 6.4nm, and rutile content is 46%; Crystallite dimension is 8.3nm, the mass ratio of titanium dioxide and rectorite (titanium dioxide: rectorite) be 0.6: 1.
Embodiment 10: except that the attapulgite powder is changed into the illite powder, other technological parameters are all identical with embodiment 1 with method of operating in embodiment 10, obtain titanium dioxide/illite nano composite material powder.Titanium dioxide is the mixed crystal of anatase and rutile in the nano composite material; Wherein anatase content is 53%, and crystallite dimension is 6.3nm, and rutile content is 47%; Crystallite dimension is 8.2nm, titanium dioxide and illitic mass ratio (titanium dioxide: illite) be 0.6: 1.
Embodiment 11: external except that changing the attapulgite powder into pyrophyllite powder in embodiment 11, other technological parameters are all identical with embodiment 1 with method of operating, obtain titanium dioxide/pyrophillite nano composite material powder.Titanium dioxide is the mixed crystal of anatase and rutile in the nano composite material; Wherein anatase content is 52%, and crystallite dimension is 6.5nm, and rutile content is 48%; Crystallite dimension is 8.3nm, the mass ratio of titanium dioxide and pyrophillite (titanium dioxide: pyrophillite) be 0.6: 1.
Embodiment 12: external except that changing the attapulgite powder into swelling perlite powder in embodiment 12, other technological parameters are all identical with embodiment 1 with method of operating, obtain titanium dioxide/expanded perlite nano composite material powder.Titanium dioxide is the mixed crystal of anatase and rutile in the nano composite material; Wherein anatase content is 55%, and crystallite dimension is 6.3nm, and rutile content is 45%; Crystallite dimension is 8.2nm, the mass ratio of titanium dioxide and expanded perlite (titanium dioxide: expanded perlite) be 0.6: 1.
Comparative example 1: 10 kilograms of attapulgite powders are added in the titanium tetrachloride solution of 30 liter of 2.0 mol; The temperature of control mixed serum is 30 ℃, stir on one side, in slurries, add the sodium hydroxide solution of 2.0 mol on one side; When the pH of system value reaches 2.5; Filter, washing to the electrical conductivity of filtrating is 150 μ S/cm, obtains titanium dioxide hydrates/attapulgite clay compounded body filter cake.Filter cake is added in the titanium tetrachloride solution of 30 liter of 0.5 mol, be warming up to 80 ℃, the insulated and stirred reaction is after 4 hours; The pH value of using the sodium hydroxide solution regulation system of 2.0 mol is 7.0, filters washing; Drying is pulverized, and obtains titanium dioxide/attapulgite clay nano composite material powder.Titanium dioxide is the mixed crystal of anatase and rutile in the nano composite material; Wherein anatase content is 54%, and crystallite dimension is 6.4nm, and rutile content is 46%; Crystallite dimension is 8.1nm, the mass ratio of titanium dioxide and attapulgite (titanium dioxide: attapulgite) be 0.6: 1.
Comparative example 2: 10 kilograms of attapulgite powders are added in the titanium tetrachloride solution of 37.5 liter of 2.0 mol, dipping is 24 hours under the room temperature, obtains titanium dioxide precursor/attapulgite slurry.The temperature of control titanium dioxide precursor/attapulgite slurry is 30 ℃, stir on one side, in slurries, add the sodium hydroxide solution of 2.0 mol on one side, when the pH of system value reaches 2.5; Stop to add, be warming up to 80 ℃, the insulated and stirred reaction is after 4 hours; The pH value of using the sodium hydroxide solution regulation system of 2.0 mol is 7.0, filters washing; Drying is pulverized, and obtains titanium dioxide/attapulgite composite material powder.Titanium dioxide is undefined structure in the composite, the mass ratio of titanium dioxide and attapulgite (titanium dioxide: attapulgite) be 0.6: 1.
Comparative example 3: 10 kilograms of attapulgite powders are added in the titanium tetrachloride solution of 30 liter of 2.0 mol, dipping is 24 hours under the room temperature, obtains titanium dioxide precursor/attapulgite slurry.The temperature of control titanium dioxide precursor/attapulgite slurry is 30 ℃; Stir on one side; In slurries, add the sodium hydroxide solution of 2.0 mol on one side, when the pH of system value reaches 2.5, filter; Washing to the electrical conductivity of filtrating is 150 μ S/cm, obtains titanium dioxide hydrates/attapulgite clay compounded body filter cake.Filter cake is added in the titanium tetrachloride solution of 30 liter of 0.5 mol, be warming up to 40 ℃, the insulated and stirred reaction is after 4 hours; The pH value of using the sodium hydroxide solution regulation system of 2.0 mol is 7.0, filters washing; Drying is pulverized, and obtains titanium dioxide/attapulgite composite material powder.Titanium dioxide is undefined structure in the composite, the mass ratio of titanium dioxide and attapulgite (titanium dioxide: attapulgite) be 0.6: 1.
The photocatalysis performance evaluation of embodiment 13 titanium dioxide/silicate mineral nano composite material
In XPA photochemical reaction appearance (the dynamo-electric factory of Nanjing Xu Jiang), add 0.2 and restrain the nano composite material that is equipped with; The reactive red M-2B aqueous solution that to add 500 milliliters of mass concentrations again be 20 mg/litre; Open to stir and feed the air of 0.02 liter/minute of flow, open uviol lamp (power 15W, wavelength 254nm), whenever sampled 15 milliliters at a distance from 10 minutes from the bottom; Centrifugation is got supernatant liquor and is tested.Under its maximum absorption wavelength, measure solution absorbency through spectrophotometer, degradation rate is calculated as follows:
η is degradation rate (%); A
0, A
tBe respectively degrade preceding, the solution absorbance of t after the time; C
0, C
tBe respectively degrade preceding, the solution concentration of t after the time.
The photocatalysis experimental data of embodiment and comparative example products obtained therefrom is as shown in table 1 below.The reactive red degradation rate is high more to show that the photocatalysis performance of titanium dioxide/silicate mineral nano composite material is good more.Lack 3-60 hour step of dipping among the present invention in the comparative example 1, silicate does not cause the final products photocatalytic activity not high through effective activation.Lack in the comparative example 2 in the step 2 of the present invention filter and step 3 in add titanium tetrachloride solution once more, titanium dioxide is failed on silicate mineral, to carry out low temperature crystallized and growth, so titanium dioxide is undefined structure in the product, photocatalytic activity is not high.Changed the temperature of step 3 of the present invention in the comparative example 3, be merely 40 ℃, influenced titanium dioxide and on silicate mineral, carried out low temperature crystallized and growth, effect same is undesirable.
The photocatalysis test of table 1 clay/titanic oxide nano compound material
With above-mentioned foundation desirable embodiment of the present invention is enlightenment, and through above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.The technical scope of this invention is not limited to the content on the specification, must confirm its technical scope according to the claim scope.
Claims (5)
1. the preparation method of titanium dioxide/silicate mineral nano composite material comprises the steps:
(1), at first silicate mineral is added titanium tetrachloride solution, the hydrochloric acid that utilizes the titanium tetrachloride solution hydrolysis to produce carries out activation and dissolved impurity ion to silicate mineral;
(2), then add certain alkaline solution the titanium ion in the solution is converted into the titanium dioxide hydrates deposition, other foreign ions of flush away obtain titanium dioxide hydrates/silicate mineral complex filter cake;
(3), again filter cake is added in the titanium tetrachloride solution; The sour environment that utilizes the titanium tetrachloride solution hydrolysis to produce is realized dissolving, the re-activation of silicate mineral, the low temperature crystallized and growth of nano titanium oxide on silicate mineral of titanium dioxide hydrates; Filtration, washing, dry, pulverizing make titanium dioxide/silicate mineral nano composite material at last.
2. the preparation method of the described titanium dioxide of claim 1/silicate mineral nano composite material is characterized in that the mass ratio of titanium dioxide and silicate mineral is 0.2～1: 1 in the composite, and the preparation method of this composite comprises the steps:
(1), silicate mineral is added in the titanium tetrachloride solution of 0.5～3.0 mol, flooded under the room temperature 3～60 hours, obtain titanium dioxide precursor/silicate mineral slurries;
(2), the temperature of the titanium dioxide precursor/silicate mineral slurries of regulating step 1 gained is 10～50 ℃; Stir on one side; The pH value that adds the alkaline solution regulation system of 0.5～4.0 mol on one side is 1.6～3.0; Filter, washing obtains titanium dioxide hydrates/silicate mineral complex filter cake to the electrical conductivity≤200 μ S/cm of filtrating;
(3), the titanium dioxide hydrates/silicate mineral complex filter cake with step 2 gained adds in the titanium tetrachloride solution of 0.2～1.0 mol; Be warming up to 60～100 ℃; Insulated and stirred reaction 1～12 hour; Using the pH value of the alkaline solution regulation system of 1.0～4.0 mol is 6.5～7.5, obtains titanium dioxide/silicate mineral nano composite material slurries;
(4), with the composite dope filtration of step 3 gained, washing, 60-180 ℃ of drying pulverized, and promptly gets titanium dioxide/silicate mineral nano composite material powder.
3. the preparation method of claim 1 or 2 described titanium dioxide/silicate mineral nano composite materials is characterized in that the silicate mineral described in the step 1 is selected from attapulgite, imvite, diatomite, sepiolite, mica, talcum, rectorite, illite, pyrophillite, expanded perlite.
4. the preparation method of the described titanium dioxide of claim 2/silicate mineral nano composite material; It is characterized in that the quality of titanium tetrachloride solution consumption by titanium dioxide that its complete reaction generates, titanium dioxide is 0.1～0.8: 1 with silicate mineral quality ratio in the step 1; Titanium dioxide is 0.1～0.2: 1 with silicate mineral quality ratio in the step 3.
5. the preparation method of claim 1 or 2 described titanium dioxide/silicate mineral nano composite materials is characterized in that step 2, the alkaline solution described in 3 are a kind of in sodium hydroxide solution, potassium hydroxide solution, the ammoniacal liquor.
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