CN109174100B - Decontaminating agent, preparation method and application thereof - Google Patents

Decontaminating agent, preparation method and application thereof Download PDF

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CN109174100B
CN109174100B CN201811028534.XA CN201811028534A CN109174100B CN 109174100 B CN109174100 B CN 109174100B CN 201811028534 A CN201811028534 A CN 201811028534A CN 109174100 B CN109174100 B CN 109174100B
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titanium dioxide
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慈颖
王思
王静
张晓龙
于珊珊
黄卓人
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Chinese Academy of Inspection and Quarantine CAIQ
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Abstract

The invention relates to a decontamination agent, a preparation method and application thereof. The decontamination agent is a suspension of metal co-doped nano titanium dioxide, wherein the metal in the metal co-doped nano titanium dioxide comprises at least one of Fe and Cu, and the solvent is hydrofluoroether. The invention also provides a preparation method of the metal co-doped nano titanium dioxide, which has the advantages of easily obtained raw materials, mild conditions and stable performance of the prepared product and is beneficial to industrial production. The obtained metal co-doped nano titanium dioxide has good photocatalytic performance, is used for preparing a decontamination agent, has good digestion efficiency on a toxic agent, and has the advantages of high efficiency, wide applicability, quick response, environmental friendliness, low corrosivity on the environment and the like.

Description

Decontaminating agent, preparation method and application thereof
Technical Field
The invention relates to a decontamination agent of a metal co-doped nano titanium dioxide suspension, a preparation method and application thereof, belonging to the technical field of decontamination agents.
Background
Decontaminants are reagents used to treat or remove biochemical agents by absorption, destruction, neutralization, detoxification, to achieve a process that is safe for a human, object, or area.
The inspection and quarantine department is the first line of defense for terrorists outside the defense border to implement nuclear, biochemical and terrorist activities in China, along with the rapid development of scientific technology, more and more sensitive devices such as electronic, optical, audio-video, communication and the like are arranged on the port, and because the devices are expensive, precise in structure, powerful in function, greatly influenced by temperature and humidity and not corrosion-resistant, the traditional decontamination agent cannot meet the decontamination requirements of the decontamination agent. Therefore, it is necessary to develop a suitable decontamination technology for sensitive devices to ensure the operational performance of the devices in the future port anti-chemical terrorist attack and emergency rescue.
In recent years, nanometer titanium dioxide which has the characteristics of high stability, low toxicity, wide existence and low cost is receiving more and more attention as a high-activity adsorption and digestion material. However, the wide band gap of nano-titania results in its low visible light utilization, which greatly limits the photocatalytic efficiency of nano-titania. People strive to modify the nano titanium dioxide in a metal or nonmetal ion doping mode so as to enhance the photocatalytic efficiency of the nano titanium dioxide. But due to the nano TiO2There are several preparation methods, and the catalyst obtained by different methods has different surface state, crystal structure, particle size, morphology and catalytic activity, etc., even if the nano TiO prepared by the same method2The preparation conditions, such as precursor concentration, temperature, time, heat treatment conditions, etc., also affect the photocatalytic activity, and the organic pollutants have various and complex structures, and the photocatalytic decomposition path and mechanism are different along with the difference of molecular structuresTherefore, the photocatalyst suitable for different degradation objects is different, and for a certain target pollutant, the optimal catalyst is difficult to select theoretically and must be screened or verified through experiments.
Disclosure of Invention
Technical problem to be solved
In order to solve the problems in the prior art, the invention provides a decontamination agent, a preparation method and application thereof.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
the decontamination agent is a suspension of metal co-doped nano titanium dioxide.
Further, the metal includes at least one of Fe and Cu.
Preferably, the metal accounts for 4-18% of the weight of the nano titanium dioxide.
Further, the metal accounts for 8-12% of the weight of the nano titanium dioxide preferably;
most preferably, the metal is 10% by weight of the nano titanium dioxide.
As mentioned above, preferably the metal is preferably Fe and Cu, the atomic ratio of Fe to Cu being 1:2,1:1,2:1 or 3: 1; most preferably the atomic ratio of Fe to Cu is 2: 1.
The decontaminant as described above, preferably, the solvent in the suspension is polyacrylamide, polymethacrylic acid or hydrofluoroether (HFE-458); the preparation ratio of the metal co-doped nano titanium dioxide to the solvent is preferably 50-200 g: 100-500 mL.
Polyacrylamide, polymethacrylic acid, hydrofluoroether and the like can be used as dispersing agents of the nano titanium dioxide, wherein hydrofluoroether (HFE-458) is most preferable, and has the characteristics of low toxicity, no corrosiveness, no combustion, no dust generation, good solubility, proper boiling point, good spreading and infiltration capacity and the like.
A preparation method of metal co-doped nano titanium dioxide comprises the following steps:
s1, configuring the TiOSO-containing material4Adding urea into the dilute sulfuric acid solution for multiple times, and continuously stirring;
s2, adding a salt solution containing metal ions into the solution in the step S1 to obtain a mixed solution;
s3, stirring the mixed solution at a constant temperature of 90-100 ℃, and naturally cooling to room temperature; filtering to obtain a precipitate;
and S4, washing the precipitate with deionized water, filtering, drying in vacuum, and grinding to obtain dry powder, namely the metal co-doped nano titanium dioxide.
In the above preparation method, preferably, the metal is iron or/and copper, and the metal ion is Fe3+Or/and Cu2+。
In the above production method, preferably, the salt solution of the metal ion is Fe (NO)3)3·9H2O or FeCl3Or Fe2(SO4)3Or/and Cu (NO)3)3·3H2O or Cu Cl2Or Cu SO4。
The preparation method as described above, preferably, in step S1, the TiOSO4In a dilute sulfuric acid solution of TiOSO4The concentration of the urea is 10-80 g/L, and the dosage of the urea is 50-150 g per liter of dilute sulfuric acid solution.
In the above preparation method, preferably, in step S2, the concentration of the salt solution containing metal ions is 0.01-0.5 mol/L, and the addition amount is 10-200 mL.
According to the invention, the urea is added by stirring for multiple times, so that the phenomena of uneven particle size, agglomeration and the like of the generated metal-doped nano titanium dioxide can be avoided.
In the above production method, preferably, in step S2, the amount of the salt solution containing metal ions is 2 to 18% by weight of the titanium dioxide. The preparation method as described above is preferableIn step S2, the metal-containing ion is Fe3+And Cu2+When being in contact with Fe3+And Cu2+The molar ratio is 1:2,1:1,2:1 or 3: 1. Most preferably said Fe3+And Cu2+The molar ratio was 2: 1.
In the preparation method, in step S3, the stirring time is preferably 6-8 hours, and the reaction temperature is preferably 90-100 ℃; in step S4, the number of washing times is 2-4, the temperature of vacuum drying is 50-70 ℃, and the time is 12-24 h.
The reaction conditions are optimized to obtain: the urea hydrolysis rate increases with the reaction time, and when the reaction time reaches 8h, TiOSO4The solution reacts completely, the reaction time is further prolonged, and the growth of nano particles can be caused; the yield of the titanium dioxide is increased along with the increase of the reaction temperature, but after the reaction temperature is increased to 100 ℃, urea is easy to isomerize and condense due to overhigh temperature, and the yield of the titanium dioxide is reduced, so the reaction temperature is preferably 90-100 ℃; the titanium dioxide is calcined in high-temperature air, the crystalline phase is easy to change, and the drying condition under vacuum at a lower temperature of 50-70 ℃ is selected, so that the sample drying efficiency and the sample quality can be improved.
The metal co-doped nano titanium dioxide obtained by the preparation method is used for preparing the decontamination agent.
Preferably, the metal co-doped nano titanium dioxide is uniformly dispersed in polyacrylamide, polymethacrylic acid or HFE-458, so that a homogeneous metal co-doped nano titanium dioxide suspension can be obtained to be used as a decontamination agent. The nano titanium dioxide can be prepared according to the proportion that 50-200 g of nano titanium dioxide is dissolved in 100-500 mL of polyacrylamide, polymethacrylic acid or HFE-458.
The decontamination agent or the decontamination agent prepared by the method can be used for decontaminating sensitive equipment such as electronics, optics, audio and video, communication and the like.
(III) advantageous effects
The invention has the beneficial effects that:
the invention provides a new decontamination agent, namely nano titanium dioxide with different Fe or/and Cu doping ratios and doping amounts. Compared with non-metal doped nano titanium dioxide (such as nitrogen doped titanium dioxide), although the nitrogen doped nano titanium dioxide is proved to be an effective way for improving the visible light absorption capability of the titanium dioxide, the improvement of the visible light catalysis performance of the titanium dioxide is limited because the recombination rate of photoproduction electrons and holes is easily improved, and in addition, the nitrogen doping can also reduce the photocatalysis performance of the titanium dioxide under the irradiation of ultraviolet light, so the development and the application of the titanium dioxide in the field of titanium oxide photocatalysis are limited to a great extent; compared with single nano titanium dioxide and single metal-doped nano titanium dioxide (such as Fe or Cu-doped nano titanium dioxide), the Fe and Cu-codoped nano titanium dioxide can obviously reduce the band gap of anatase, and simultaneously improve the absorption capacity and visible light catalytic performance of the anatase on visible light, and has the advantages of high efficiency, wide applicability, quick response, environmental friendliness, low corrosivity on environment and the like.
The preparation method for preparing the metal-doped nano titanium dioxide provided by the invention has the advantages of easily available raw materials, mild conditions and stable performance of the prepared product, and is beneficial to industrial production.
10 wt% of Fe2-Cu1-TiO2The suspension prepared by uniformly mixing with HFE-458 (hydrofluoroether) is used for simulating the degradation activity of 2-CEES (2-chloroethyl ethyl sulfide) serving as a simulation agent for catalytically digesting blister agent HD (mustard gas) and DMMP (dimethyl methyl phosphate) serving as a GD simulation agent under visible light, and the degradation activity is higher, and the degradation rate of the surface of the VX simulation agent malathion is higher. The decontamination agent can be applied to decontamination of sensitive electronic equipment, such as electronic equipment, optical equipment, audio-video equipment, communication equipment and the like, and has no corrosiveness.
Drawings
FIG. 1 is a graph showing the photocatalytic degradation effect of nano titanium dioxide with different metal doping amounts on 2-CEES;
FIG. 2(1) is an XRD spectrum of nano titanium dioxide with different Fe2-Cu1 doping amounts,
FIG. 2(2) is a UV-Vis spectrum diagram of nano titanium dioxide with different Fe2-Cu1 doping amounts;
FIG. 3(1) is TiO2And 10 wt% Fe2-Cu1-TiO2Nitrogen adsorption and desorption isothermA curve;
FIG. 3(2) is TiO2And 10 wt% Fe2-Cu1-TiO2High resolution transmission electron microscopy images; wherein a and c are TiO2B and d are 10 wt% Fe2-Cu1-TiO2High resolution transmission electron microscopy images;
FIG. 4 shows Fe2-Cu1-TiO2And the effect of the suspension of HFE-458 on the digestion of 2-CEES, DMMP, malathion.
Detailed Description
The homogeneous precipitation method is to utilize a certain chemical reaction to slowly and uniformly release a precipitant from a solution, so that the precipitant can be uniformly formed in the solution and finally thermally decomposed to obtain an oxide, and the dispersibility of the nanoparticles can be improved. The invention adopts a urea precipitation method to prepare the iron-copper co-doped nano titanium dioxide, and the method is to use Ti-containing titanium4+And adding the doped ion inorganic salt solution into a precipitator urea, obtaining uniform precipitates by controlling the microenvironment of precipitation reaction, filtering, washing and drying the precipitates, and calcining under certain conditions to obtain the metal doped nano titanium dioxide split body. The method has the advantages of simple process, low synthesis temperature, wide raw material source, low cost and easy realization of industrial control production.
For a better understanding of the present invention, reference will now be made in detail to the present invention by way of specific embodiments thereof.
Example 1
Preparing a dilute sulfuric acid solution according to the volume ratio of concentrated sulfuric acid to deionized water of 1: 400; to 400mL of the prepared solution was added 10g of TiOSO4After uniform mixing, 30g of urea was added in portions with continuous stirring, and 35.7mL of Fe (NO) with a concentration of 0.1mol/L was added3)3·9H2And (4) O solution. The mixed solution is stirred for 8 hours at the constant temperature of 95 ℃ and then naturally cooled to the room temperature. The obtained precipitate was washed with deionized water, filtered three times, and dried in a vacuum oven at 60 ℃ for 24 hours. Grinding the resulting dry powder, calculating the theoretical mass fraction of doped iron in the powder, 4% of titanium dioxide, and marking as 4 wt% Fe/TiO2. The concentration of the metal ion salt added (e.g., Fe (NO) is adjusted using a procedure similar to that described above3)3·9H2O or Fe2(SO4)3Or Cu (NO)3)3·3H2O or Cu Cl2Or Cu SO4) Respectively obtaining the iron or copper ion doped nano titanium dioxide (marked as Fe/Cu-TiO) with the mass fraction of 0, 6 wt%, 8 wt%, 10 wt%, 12 wt%, 14 wt%, 16 wt% and 18 wt%2)。
Example 2
On the basis of the embodiment 1, preparing a dilute sulfuric acid solution according to the volume ratio of concentrated sulfuric acid to deionized water of 1: 400; to 400mL of the prepared solution was added 10g of TiOSO4After being uniformly mixed, the mixture is added with 30g of urea by multiple times with continuous stirring, and then a certain amount of Fe (NO) is added3)3·9H2O and Cu (NO)3)2·3H2O (controlling the sum of theoretical doping amounts of iron and copper to be 4 wt%, 6 wt%, 8 wt%, 10 wt%, 12 wt%, 14 wt%, 16 wt% and 18 wt%), stirring the mixed solution at a constant temperature of 95 ℃ for 8 hours, and naturally cooling to room temperature. The obtained precipitate was washed with deionized water, filtered three times, and dried in a vacuum oven at 60 ℃ for 24 hours. Grinding the obtained dry powder to obtain the iron-copper co-doped nano titanium dioxide (marked as Fe) with different mass fractionsx-Cuy-TiO2(ii) a Wherein x and y are Fe3+、Cu2+Doping molar ratio).
Example 3
This example was carried out based on example 2 by adjusting the amount of Fe to be doped while keeping the total amount of iron ions and copper ions in the solution constant (i.e., the total mass of iron ions and copper ions in the solution constant) (e.g., 0 wt%, 4 wt%, 8 wt%, 10 wt%, 14 wt%, 18 wt%)3+、Cu2+The ion doping ratio is 1:2,1:1,2:1,3:1 (i.e., Fe)3+、Cu2+Molar ratio) to obtain nano titanium dioxide with different metal doping ratios, which is recorded as: fe1-Cu2-TiO2,Fe1-Cu1-TiO2,Fe2-Cu1-TiO2,Fe3-Cu1-TiO2. For example, dilute sulfuric acid solution is prepared according to the volume ratio of concentrated sulfuric acid to deionized water of 1: 400; to 400mL of the prepared solution was added 10g of TiOSO4After uniform mixing, 30g of urea are added in several portions and continuously stirred, and then 56ml of 0.1mol/l urea is addedFe(NO3)3·9H2O, 28ml of 0.1mol/l Cu (NO)3)2·3H2And (4) O solution. The mixed solution is stirred for 8 hours at the constant temperature of 95 ℃ and then naturally cooled to the room temperature. The obtained precipitate was washed with deionized water, filtered three times, and dried in a vacuum oven at 60 ℃ for 24 hours. Grinding the mixture to obtain dry powder which is 10 wt% of Fe2-Cu1-TiO2。
The structural characteristics of the nano titanium dioxide with different Fe2-Cu1 doping amounts in the embodiment 3 are characterized. As shown in figure 2(1), an XRD spectrogram shows a characteristic diffraction peak of titanium dioxide with an anatase crystal form, and analysis of the intensity of the diffraction peak (101) shows that the particle size of the nano titanium dioxide is gradually reduced along with the increase of the metal doping amount, trace metal doping does not change the crystal form of the nano titanium dioxide, but the characteristic diffraction peak intensity of the titanium dioxide is weakened and tends to be in a disordered state along with the increase of the doping amount, and when the doping amount of Fe2-Cu1 is more than 10 wt%, Fe appears on the XRD spectrogram2O3Characteristic diffraction peaks for/CuO (2 θ ═ 35.6 and 38.2). It is concluded that: when the doping amount of Fe/Cu is too large, the crystal lattice of the nano titanium dioxide cannot accommodate more metal ion doping, and Fe/Cu can be separated out to the surface of the nano titanium dioxide to form Fe2O3Or CuO, covering the surface catalytic active sites thereof, resulting in the reduction of the photocatalytic degradation efficiency of the chemical poison simulator; the ultraviolet-visible absorption performance of the metal-doped nano titanium dioxide is researched by a Japanese Shimadzu ultraviolet-visible spectrometer (UV-3600), and fig. 2(2) is TiO2And Fe2-Cu1-TiO with different iron and copper doping amounts2An ultraviolet visible absorption spectrum of a sample shows that the doping of the Fe2-Cu1 metal improves the utilization rate of the titanium dioxide to visible light.
As shown in FIG. 3(1) isothermal curve of nitrogen adsorption/desorption, TiO was analyzed by a specific surface area analyzer (Quantachrome, USA)2And 10 wt% Fe2-Cu1-TiO2Particle size and specific surface area of (a); FIG. 3(2) is TiO2(a, c) and 10 wt% Fe2-Cu1-TiO2Electron micrographs of (b, d) showing the TiO synthesized in example 12(without metal ion doping) and 10 wt% Fe2-Cu1-TiO2Has typical mesoporous structure characteristics and is compatible with TiO2Compared with 10 wt%Fe2-Cu1-TiO2The catalyst has higher specific surface area and pore size, is beneficial to the adsorption of reaction substances, and further promotes catalytic reaction; the characterization result of the electron microscope is consistent with the XRD and BET characterization results, and the obvious lattice fringes are displayed, the spacing is about 0.35nm, and the obvious lattice fringes are matched with the (101) crystal form of the nano titanium dioxide with the anatase structure, so that the obvious lattice structure is further shown. It can be seen that with TiO2In contrast, 10 wt% Fe2-Cu1-TiO2The size is increased, the distribution is uniform, and the dispersibility is good.
Example 4
With different Fe/Cu-TiO2And Fe-Cu-TiO2Sample for study, 100mg of the synthesized catalyst sample was mixed with 5mg of 2-CEES (2-chloroethylethylthioether) in a quartz reactor under a 300W xenon lamp (CEL-S500, 400mW/cm)2) The reaction time is 90min under the simulated sunlight. The final reaction product of 2-CEES was extracted with 5mL of acetonitrile and the extracts were subjected to quantitative qualitative analysis by gas chromatography (agilent 7890A, hydrogen flame detector).
The results of the measurement of the photocatalytic digestion percentage of 2-CEES by nano titanium dioxide with different metal doping amounts are plotted as an effect graph shown in figure 1, and TiO doped with Fe or/and Cu can be seen from the effect graph2(Fe/Cu-TiO2And Fe-Cu-TiO2) TiO prepared than simply2The degradation activity of the titanium dioxide is higher than that of the titanium dioxide doped by a single metal, and the degradation activity of the Fe and Cu co-doped nano titanium dioxide obtained by co-doping Fe and Cu with different molar ratios of atomic weight is higher than that of the titanium dioxide doped by a single metal. It can also be seen from the figure that the degradation activity of titanium dioxide doped with different metal amounts is different, and the degradation activity is increased and then decreased with the increase of the metal amount, which means that the degradation activity is higher when the metal content is not higher, and when the metal content reaches TiO2When the content is 10 percent by weight, the degradation activity is highest, and the performance is optimal; when the metal content is more than 10%, the degrading activity starts to decrease as the weight of the metal increases.
When the metal content is TiO2At 10% by weight of (A), the molar ratio of Fe to Cu is 2:1The lytic activity was the highest.
Example 5
Preparation of the suspension: HFE-458 has the characteristics of low toxicity, good solubility and good stability, and is used as an excellent dispersing solvent for nano titanium dioxide. 100mg of Fe2-Cu1-TiO obtained by adjusting the amount of metal doped to 10% as prepared in example 3 and the atomic number ratio, i.e., the molar ratio, of iron to copper to 2:12The catalyst suspension was homogeneously dispersed in 300. mu.L of HFE-458 to give a homogeneous catalyst suspension.
And (3) digestion performance testing: the suspensions prepared above were examined for their disinfecting properties against chemical agent mimics (2-CEES, DMMP and malathion) on a stainless steel surface at room temperature. Uniformly distributing 5 μ L of chemical toxin agent simulant on the surface of the test piece, uniformly spraying suspension on the contaminated surface to make the suspension completely cover the whole test piece, wherein the spraying density is about 600mL/m2. The test piece is placed under simulated sunlight for reaction for 90min, a quartz glass cover is covered in the process, and a gas collecting device (model QC-2B, the institute of labor protection and science in Beijing) is connected with a gas outlet at the top end of the glass cover. After the reaction is finished, acetonitrile is used for extracting the toxin participating agent on the surface of the test piece and the residual toxin in the gas collecting device, and the extract liquid is analyzed by gas chromatography. At the same time, another set of blank samples was set up to exclude the absorption of toxic agents by the gas absorption device.
The digestion effects of the prepared suspension on 2-CEES, DMMP and malathion are obtained by measuring the concentration of the chemical poison simulator solution before and after the suspension is sprayed and calculating, as shown in figure 4, the surface removal rates of the suspension on 2-CEES and DMMP can reach 99.73% and 99.20% within 20min, the reaction time of the malathion and the suspension is prolonged to 60min, and the surface removal rate can reach 97.27%. Therefore, the metal co-doped nano titanium dioxide prepared by the invention has the performance of quickly degrading toxic agents, can quickly degrade 2-CEES and DMMP in a short time, has small difference in the performance of degrading 2-CEES and DMMP, and has a lower rate of degrading malathion. The pH of the suspension prepared by the invention is nearly neutral, and the suspension is suitable for digesting 2-CEES and DMMP, while malathion is easy to hydrolyze under alkaline conditions, and the dissolution rate of the malathion is a reaction control step under alkaline conditions; in addition, the digestion rate of 2-CEES, DMMP and malathion is related to the reaction temperature, and the digestion rate of 2-CEES and DMMP can reach more than 99 percent at room temperature. In practical application, the digestion effect of the malathion can be improved by adjusting the reaction time, preparing a thermal suspension and the like.
Example 6
4 metal sheets (stainless steel, aluminum sheets, copper sheets and carbon steel), 5 plastics (phenolic resin, polypropylene, polystyrene, polyvinyl chloride and epoxy resin), 7 rubbers (ethylene propylene rubber, styrene butadiene rubber, chloroprene rubber, butyl rubber, silicon rubber, butadiene rubber and natural rubber) and 3 sensitive equipment elements (a display card, a U disk and an optical disk) are selected as test objects. At room temperature, different sensitive materials were immersed in the decontamination agent prepared in example 5 for 1-2 hours, and it was found that: after different sensitive materials are soaked in the HEF-458 for a certain time, the appearance and the appearance are basically not influenced, the quality and the size change can be ignored, and the high-performance composite material has good compatibility with metal and plastic products. The functions of the electronic equipment and the storage element are not damaged.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art can change or modify the technical content disclosed above into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.

Claims (6)

1. The decontamination agent is characterized in that the decontamination agent is a suspension of metal co-doped nano titanium dioxide;
the metal is Fe and Cu, and the atomic ratio of Fe to Cu is 1:2,1:1,2:1 or 3: 1; the solvent in the suspension is polyacrylamide, polymethacrylic acid or hydrofluoroether; the metal accounts for 8-12% of the weight of the nano titanium dioxide.
2. The decontamination agent of claim 1, wherein the metal co-doped nano titanium dioxide and the solvent are provided in a ratio of 50-200 g: 100-500 mL.
3. A preparation method of metal co-doped nano titanium dioxide for preparing a decontamination agent is characterized by comprising the following steps:
s1, configuring the TiOSO-containing material4Adding urea into the dilute sulfuric acid solution for multiple times, and continuously stirring;
s2, adding a salt solution containing metal ions into the solution in the step S1 to obtain a mixed solution;
s3, stirring the mixed solution at a constant temperature of 90-100 ℃, and naturally cooling to room temperature; filtering to obtain a precipitate;
s4, washing and filtering the precipitate by deionized water, and then carrying out vacuum drying and grinding to obtain dry powder, namely the metal co-doped nano titanium dioxide;
in step S1, the TiOSO4In a dilute sulfuric acid solution of TiOSO4The concentration of the urea is 10-80 g/L, and the dosage of the urea is 50-150 g per liter of dilute sulfuric acid solution;
in step S2, the metal-containing ion is Fe3+And Cu2+Said Fe3+And Cu2+The molar ratio is 1:2,1:1,2:1 or 3: 1;
the dosage of the salt solution containing the metal ions is 2-18% of the weight of the titanium dioxide.
4. The preparation method according to claim 3, wherein in step S3, the stirring time is 6-8 h; in step S4, the number of washing times is 2-4, the temperature of vacuum drying is 50-70 ℃, and the time is 12-24 h.
5. Use of a decontaminant as claimed in claim 1 or 2 for decontamination of electronic, optical, audiovisual or communication equipment.
6. The metal co-doped nano titanium dioxide obtained by the preparation method according to claim 3 or 4 is used for preparing a decontamination agent.
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