Preparation method and application of mesoporous imprinted TiO2

An imprinting and mesoporous technology, applied in chemical instruments and methods, light water/sewage treatment, energy and wastewater treatment, etc., can solve the problems of ineffective treatment of photocatalytic degradation, and achieve simple methods, high photocatalytic activity, simple craftsmanship

Inactive Publication Date: 2014-05-14
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although these techniques can improve the TiO 2 The photocatalyst has photocatalytic activity, but it has no selectivity for pollutants. High-concentration (often low-toxicity) pollutants will quickly reach saturated adsorption on its surface and be preferentially degraded, while low-concentration and highly toxic organic pollutants coexisting with it The photocatalytic degradation of substances (such as environmental endocrine disruptors) is inhibited and cannot be effectively treated

Method used

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  • Preparation method and application of mesoporous imprinted TiO2
  • Preparation method and application of mesoporous imprinted TiO2
  • Preparation method and application of mesoporous imprinted TiO2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Dissolve 0.8g of P123 in 25ml of absolute ethanol, stir to dissolve completely.

[0030] 2. Add 1.25ml of titanium tetrachloride to solution 1, and stir for 10 minutes.

[0031] 3. Add 0.25g imprinted molecule BPA to the 2 solution, and continue to stir for 2.5h.

[0032] 4. Transfer the resulting mixed solution to a petri dish, and evaporate naturally at room temperature for 24 hours.

[0033] 5. The obtained yellow gel was dried in an oven at 40° C. to obtain a white solid.

[0034] 6. Put the dried white solid into a muffle furnace and roast at 450°C for 3h, and the heating rate is 5°C / min to obtain mesoporous imprinted TiO 2 .

[0035] 4mg TiO 2 Added to the mixed solution containing both target pollutant BPA and non-target pollutant phenol with a concentration of 20mg / L. After 30 minutes in the dark, photocatalytic degradation was carried out under the irradiation of a 500w mercury lamp. BPA was completely degraded under 45min of light; the degradation rat...

Embodiment 2

[0037] 1. Dissolve 0.8g P123 and 0.5g F127 in 25ml of absolute ethanol, stir to dissolve completely.

[0038] 2. Add 1ml of titanium tetrachloride and 0.7ml of butyl titanate to solution 1, and stir for 10 minutes.

[0039] 3. Add 0.5 g of imprinted molecule BPA to the solution 2, and continue to stir for 2.5 hours.

[0040] 4. Transfer the resulting mixed solution to a petri dish, and evaporate naturally at room temperature for 24 hours.

[0041] 5. Dry the obtained yellow gel in an oven at 60°C.

[0042] 6. Put the dry white solid into a muffle furnace and bake it at 450°C for 2h with a heating rate of 5°C / min to obtain mesoporous imprinted TiO 2 .

[0043] 4mg TiO 2 Added to the mixed solution containing both target pollutant BPA and non-target pollutant phenol with a concentration of 20mg / L. After 30 minutes in the dark, photocatalytic degradation was carried out under the irradiation of a 500w mercury lamp. BPA was completely degraded under 40min of light; the degrada...

Embodiment 3

[0045] 1. Dissolve 0.5g of F127 in 25ml of absolute ethanol, stir to dissolve completely.

[0046] 2. Add 0.7ml of titanium tetrachloride and 1.5ml of butyl titanate to solution 1, and stir for 10 minutes.

[0047] 3. Add 0.75g of imprinted molecule BPA to the 2 solution, and continue to stir for 2.5h.

[0048] 4. Transfer the resulting mixed solution to a petri dish, and evaporate naturally at room temperature for 24 hours.

[0049] 5. The obtained yellow gel was dried in an oven at 40° C. to obtain a white solid.

[0050] 6. Put the dry white solid into a muffle furnace and bake at 400°C for 3h, so that the heating rate is 5°C / min to obtain mesoporous imprinted TiO 2 .

[0051] 4mg TiO 2 Added to the mixed solution containing both target pollutant BPA and non-target pollutant phenol with a concentration of 20mg / L. After 30 minutes in the dark, photocatalytic degradation was carried out under the irradiation of a 500w mercury lamp. BPA was completely degraded under 45mi...

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Abstract

The invention provides a method for preparation of mesoporous imprinted TiO2 through a sol-gel process and its application. The method comprises: first dissolving 0.5-2g of a template agent in 20-30ml of ethanol absolute, conducting stirring to make the template agent dissolved completely, then adding 0.2-3ml of a titanium source material and 0.1-2g of a target pollutant molecule, carrying out further stirring for 2-5h; transferring the solution to a culture dish, and performing sol aging; and putting the obtained yellow gel into an oven and implementing drying at 40DEG C-80DEG C, and finally putting the dried white solid into a muffle furnace to implement roasting at 400DEG C-450DEG C for 3-5h, thus obtaining white powder, i.e. the mesoporous imprinted TiO2. The mesoporous imprinted TiO2 prepared by the invention has a specific surface area up to 148m<2> / g, which is 3 times that of P25. The material prepared by the method of the invention can be used to degrade organic pollutants in water, the material has higher photocatalytic activity compared with non-imprinted TiO2 and P25, and at the same time has a selective degradation ability on target pollutants.

Description

technical field [0001] The invention belongs to the field of semiconductor photocatalysts, in particular to a mesoporous titanium dioxide (TiO2) containing molecular imprints of organic pollutants. 2 ) method of manufacture and use. Background technique [0002] With the increasingly serious environmental pollution, environmental pollutants have attracted global attention. There are many methods to deal with environmental pollutants, including biological methods (activated sludge method, etc.), physical methods (adsorption, etc.), chemical methods (catalytic oxidation method, electrochemical oxidation method, etc.) and so on. However, with the increase in the types of environmental pollutants, some organic pollutants are difficult to remove by traditional methods, especially those organic substances with low concentration and high toxicity. Therefore, exploring new materials and methods for treating such pollutants has become a hot issue for environmental scientists. [0...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B01J21/06C02F1/30
CPCY02W10/37
Inventor蒋峰芝王娟沙朝金卞龙春
OwnerYUNNAN UNIV