CN101559358B - Technique for improving visible light catalytic activity of titanium dioxide photocatalyst - Google Patents
Technique for improving visible light catalytic activity of titanium dioxide photocatalyst Download PDFInfo
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- CN101559358B CN101559358B CN2008100890205A CN200810089020A CN101559358B CN 101559358 B CN101559358 B CN 101559358B CN 2008100890205 A CN2008100890205 A CN 2008100890205A CN 200810089020 A CN200810089020 A CN 200810089020A CN 101559358 B CN101559358 B CN 101559358B
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- titanium dioxide
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- sulfuric acid
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Abstract
The invention discloses a technique for improving the visible light catalytic activity of a titanium dioxide photocatalyst, which is characterized by adopting sulphuric acid to enhance the visible light absorption rate of titanium dioxide. The technique comprises the following steps: (a) adding titanium dioxide powder into a sulphuric acid solution with the concentration of 0.1-0.3 mol/liter according to a mol ratio of Ti: SO4<2-> equal to 10: 1; (b) sufficiently stirring and heating the mixed solution to be boiled, concentrating and drying to be incinerated so as to obtain loose blocks; and (c) grinding the loose blocks into powder to be baked for 1-8 hours under the temperature of 500 DEG C-550 DEG C to obtain the titanium dioxide photocatalyst with improved visible light catalytic activity. After the titanium dioxide is processed by the sulphuric acid, the light absorptive character of the titanium dioxide is enhanced so as to increase the absorption of the visible light, and the visible light catalytic activity is correspondingly enhanced; the technique can be used for processing organic contaminants or metallic ions in polluted water and also be used for purifying air and especially has extensive application prospect in the field of medicine and sanitation which need serious control of ultraviolet irradiation.
Description
Technical field
The present invention relates to a kind of technology that improves visible light catalytic activity of titanium dioxide photocatalyst, belong to the preparation method of titanium dioxide optical catalyst.
Background technology
The photochemical catalyst that known use is made up of anatase titanium dioxide can carry out antibiotic property ceramic tile, self-cleaning building materials, Superhydrophilic material, deodorization/deodoring materials, water purification, treatment for cancer etc., and the exploitation of various uses is being carried out actively.
Yet,, need the following ultraviolet ray of 400nm to excite for anatase titanium dioxide.Relative therewith, in sunshine that can become exciting light sources and artificial light, contain the luminous ray more much more than ultraviolet ray.For the photochemical catalyst that above-mentioned titanium dioxide constitutes, luminous ray almost be we can say and can not be utilized well but regrettably.From the viewpoint of energy conversion efficiency, very inefficent.And this is invalid forthrightly to become very big obstacle for practicability.
Summary of the invention
The object of the present invention is to provide a kind of raising TiO 2 visible light absorbability, and further improve the improved process of its visible light catalysis activity.
Technical scheme of the present invention is: a kind of technology that improves visible light catalytic activity of titanium dioxide photocatalyst, and it is characterized in that adopting sulfuric acid to improve the visible-light absorptivity of titanium dioxide, key step comprises: according to Ti: SO
4 2-Mol ratio 10: 1 adds titania powder in the sulfuric acid solution that concentration is the 0.1-0.3 mol; Then affiliated mixed liquor is fully stirred and heat and make its boiling, concentrate and be dried to ashing, the block that obtains loosening; The block grind into powder that this is loose places under 500 ℃-550 ℃ the temperature neutral atmosphere roasting 1-8 hour, obtains having the titanium dioxide optical catalyst of improvement visible light catalysis activity.
A kind of technology that improves visible light catalytic activity of titanium dioxide photocatalyst is characterized in that adopting sulfuric acid to improve the visible-light absorptivity of titanium dioxide, and key step comprises: according to Ti: SO
4 2-Mol ratio 10: 1 adds metatitanic acid in the sulfuric acid solution that concentration is the 0.1-0.3 mol; Then affiliated mixed liquor is fully stirred and heat and make its boiling, concentrate and be dried to ashing, the block that obtains loosening; The block grind into powder that this is loose places under 500 ℃-550 ℃ the temperature neutral atmosphere roasting 1-8 hour, obtains having the titanium dioxide optical catalyst of improvement visible light catalysis activity.
A kind of technology that improves visible light catalytic activity of titanium dioxide photocatalyst is characterized in that adopting sulfuric acid to improve the visible-light absorptivity of titanium dioxide, and key step comprises: according to Ti: SO
4 2-Mol ratio 10: 1 adds butyl titanate in the sulfuric acid solution that concentration is the 0.1-0.3 mol; Then affiliated mixed liquor is fully stirred and heat and make its boiling, concentrate and be dried to ashing, the block that obtains loosening; The block grind into powder that this is loose places under 500 ℃-550 ℃ the temperature neutral atmosphere roasting 1-8 hour, obtains having the titanium dioxide optical catalyst of improvement visible light catalysis activity.
Detect through ultraviolet-visible fluorescence light Fu, the fluorescent emission intensity of titanium dioxide optical catalyst after the improvement in the 350-500nm scope reduced significantly, this illustrates that the right recombination rate reduction in light induced electron hole, light induced electron hole to effectively being separated, also are that the absorbing properties of titanium dioxide has improved.
Titanium dioxide is after sulfuric acid treatment, and absorbing properties has improved, and has strengthened the absorption to visible light, the corresponding raising of photocatalytic activity.
Titanium dioxide after the improvement can be used for the processing of organic pollution in the sewage or metal ion, also can be used for air cleaning, especially at the pharmaceutical sanitary field of the strict control ultraviolet ray of needs irradiation, more has wide practical use.
Specific embodiment
Embodiment 1:
Choosing particle diameter is the sharp iron ore type TiO of 30-50nm
2The powder art. press Ti: SO
4 2-Mol ratio adds in the sulfuric acid solution of a certain amount of 0.1mol/L at 10: 1, places in the round bottom beaker, stirs into suspension.Heating concentrates its boiling gradually, arrives uniform temperature generation ashing, the TiO that obtains loosening
2Block; Described block pulverized and grinds be placed in the neutral atmosphere stove must 500 ℃ fire 1 little just, obtain improveing product.
Detect by the methyl orange Decolorant Test, this powder has visible light catalysis activity, can be by the excited by visible light of wavelength 380-510 nanometer, and effectively excitation wavelength may extend to the green light district.
Embodiment 2
Press Ti: SO
4 2-Mol ratio adds metatitanic acid in the sulfuric acid solution of a certain amount of 0.3mol/L at 10: 1, place in the round bottom beaker, stirring is also heated gradually makes its boiling be concentrated into ashing, and the ashing product is pulverized and ground to be placed in the neutral atmosphere stove and fired 8 hours with 550 ℃, obtains improveing product.
Detect by the methyl orange Decolorant Test, this powder has visible light catalysis activity, can be by the excited by visible light of wavelength 380-510 nanometer, and effectively excitation wavelength may extend to the green light district.
Simultaneously, testing result shows not have free SO in the said goods
4 2-
Above-mentioned detailed description of the present invention being carried out with reference to embodiment; be illustrative rather than determinate; can enumerate several embodiment according to limited ranges such as set of dispense ratios,, should belong within protection scope of the present invention therefore in the variation and the modification that do not break away under the general plotting of the present invention.
Claims (3)
1. a technology that improves visible light catalytic activity of titanium dioxide photocatalyst is characterized in that adopting sulfuric acid to improve the visible-light absorptivity of titanium dioxide, and key step comprises:
(a) according to Ti: SO
4 2-Mol ratio 10: 1 adds titania powder in the sulfuric acid solution that concentration is the 0.1-0.3 mol;
(b) then described mixed liquor is fully stirred and heat and make its boiling, concentrate and be dried to ashing, the block that obtains loosening;
The block grind into powder that (c) will loosen places under 500 ℃-550 ℃ the temperature neutral atmosphere roasting 1-8 hour, obtains having the titanium dioxide optical catalyst of improvement visible light catalysis activity.
2. a technology that improves visible light catalytic activity of titanium dioxide photocatalyst is characterized in that adopting sulfuric acid to improve the visible-light absorptivity of titanium dioxide, and key step comprises:
(a) according to Ti: SO
4 2-Mol ratio 10: 1 adds metatitanic acid in the sulfuric acid solution that concentration is the 0.1-0.3 mol;
(b) then described mixed liquor is fully stirred and heat and make its boiling, concentrate and be dried to ashing, the block that obtains loosening;
The block grind into powder that (c) will loosen places under 500 ℃-550 ℃ the temperature neutral atmosphere roasting 1-8 hour, obtains having the titanium dioxide optical catalyst of improvement visible light catalysis activity.
3. a technology that improves visible light catalytic activity of titanium dioxide photocatalyst is characterized in that adopting sulfuric acid to improve the visible-light absorptivity of titanium dioxide, and key step comprises:
(a) according to Ti: SO
4 2-Mol ratio 10: 1 adds butyl titanate in the sulfuric acid solution that concentration is the 0.1-0.3 mol;
(b) then described mixed liquor is fully stirred and heat and make its boiling, concentrate and be dried to ashing, the block that obtains loosening;
The block grind into powder that (c) will loosen places under 500 ℃-550 ℃ the temperature neutral atmosphere roasting 1-8 hour, obtains having the titanium dioxide optical catalyst of improvement visible light catalysis activity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100890205A CN101559358B (en) | 2008-04-15 | 2008-04-15 | Technique for improving visible light catalytic activity of titanium dioxide photocatalyst |
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| CN2008100890205A CN101559358B (en) | 2008-04-15 | 2008-04-15 | Technique for improving visible light catalytic activity of titanium dioxide photocatalyst |
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| CN101559358A CN101559358A (en) | 2009-10-21 |
| CN101559358B true CN101559358B (en) | 2011-06-01 |
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| CN2008100890205A Expired - Fee Related CN101559358B (en) | 2008-04-15 | 2008-04-15 | Technique for improving visible light catalytic activity of titanium dioxide photocatalyst |
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| CN116769268A (en) * | 2023-07-10 | 2023-09-19 | 福尔达(宁波)智能光电有限公司 | Preparation method of composite material for interior decoration |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1363521A (en) * | 2001-01-09 | 2002-08-14 | 攀枝花市永禄科技开发有限责任公司 | Process for preparing anatase crystal type nano TiO2 |
| US6517804B1 (en) * | 2000-02-29 | 2003-02-11 | Korea Atomic Energy Institute | TiO2 ultrafine powder, and process for preparing thereof |
| CN1472007A (en) * | 2002-07-29 | 2004-02-04 | 中国科学院广州能源研究所 | Sulfuric acid and titanium dioxide composite photocatalyst and preparing method thereof |
| CN1562478A (en) * | 2004-03-16 | 2005-01-12 | 上海师范大学 | Method for preparing SO42-/TiO2 through supercriticalo exsiccation |
| CN1803291A (en) * | 2006-01-20 | 2006-07-19 | 中国科学院广州地球化学研究所 | Titanium dioxide/active carbon fiber photocatalyst and its preparation method and uses in air purification |
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- 2008-04-15 CN CN2008100890205A patent/CN101559358B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6517804B1 (en) * | 2000-02-29 | 2003-02-11 | Korea Atomic Energy Institute | TiO2 ultrafine powder, and process for preparing thereof |
| CN1363521A (en) * | 2001-01-09 | 2002-08-14 | 攀枝花市永禄科技开发有限责任公司 | Process for preparing anatase crystal type nano TiO2 |
| CN1472007A (en) * | 2002-07-29 | 2004-02-04 | 中国科学院广州能源研究所 | Sulfuric acid and titanium dioxide composite photocatalyst and preparing method thereof |
| CN1562478A (en) * | 2004-03-16 | 2005-01-12 | 上海师范大学 | Method for preparing SO42-/TiO2 through supercriticalo exsiccation |
| CN1803291A (en) * | 2006-01-20 | 2006-07-19 | 中国科学院广州地球化学研究所 | Titanium dioxide/active carbon fiber photocatalyst and its preparation method and uses in air purification |
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