CN104923197A - Compound sol preparing method with efficient photocatalytic performance - Google Patents
Compound sol preparing method with efficient photocatalytic performance Download PDFInfo
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- CN104923197A CN104923197A CN201510290917.4A CN201510290917A CN104923197A CN 104923197 A CN104923197 A CN 104923197A CN 201510290917 A CN201510290917 A CN 201510290917A CN 104923197 A CN104923197 A CN 104923197A
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Abstract
The invention discloses a compound sol preparing method with efficient photocatalytic performance and belongs to the technical field of an inorganic nanocomposite material. The method belongs to synthesis of an inorganic nanocomposite material, a CMK-3/TiO2 compound is prepared by taking prepared mesoporous carbon CMK-3 as a substrate and tetrabutyl titanate as a Ti source through a sol-gel method, the prepared composite material serves as a photocatalyst, is used for catalyzing and degrading methylene blue solution under ultraviolet and has a very good effect. The CMK-3/TiO2 compound prepared according to the method is short in synthesis time, the compound has anatase type TiO2 and rutile type TiO2, and has very high photocatalytic activity. The degradation rate of the methylene blue of 10mg/L in 60 minutes under ultraviolet is almost 100%, Besides, compared with a photocatalyst in a document, the sample has higher degradation rate and smaller preparing cost and is favorable for energy saving and reducing of synthesis cost.
Description
Technical field
The present invention relates to a kind of is carrier with mesoporous carbon CMK-3, take butyl titanate as titanium source, prepares CMK-3/TiO by sol-gel process
2compound, belongs to the technical field of inorganic nano composite material.The compound prepared has good photocatalysis performance under ultraviolet light.
Background technology
Waste water from dyestuff is one of professional waste water of the current several refractory reason of China.Waste water from dyestuff is of a great variety, and water-quality constituents is complicated, adopts traditional flocculation, biological oxidation process often can not reach satisfied removal effect.Titanium dioxide is a kind of low toxicity, cheap semi-conducting material, and there is higher degree of crystallization, have a wide range of applications in the depollution of environment, solar energy conversion, DSSC, photocatalysis, optics etc., cause showing great attention to of researcher.TiO
2light-catalyzed reaction is the feature such as photochemical properties is stable, operating condition easily controls, non-secondary pollution because having, and has broad application prospects in fields such as Water warfare, purification of air, sewage disposals.As the TiO of photochemical catalyst
2under Ultraviolet radiation, its surface produces OH free radical, organic pollutant degradation can be eliminated, and pollutant is decomposed into CO the most at last
2and H
2o.But TiO
2band gap wider (3.0 ~ 3.2eV), spectral response range is narrow, and light absorption is only limitted to ultraviolet region, only has 3-5%(Wang Hong will etc. to the utilization rate of solar energy, silicate is circulated a notice of, and 1999,1,31-34), be difficult to effectively utilize sunshine, and pure TiO
2poor to organic absorption property, be easy to condensation and assemble, be difficult to separation and recovery, this seriously constrains TiO
2the practical application of catalysis material.Therefore, TiO is expanded
2the spectral response range of catalysis, makes it have higher photocatalytic activity at visible region (400 ~ 750nm), is convenient to reclaim, and becomes study hotspot (Stylidi M etc., Appl. Catal. B:Environ, 2004,47,189-201 of people; Moon J etc., Catal. Today, 2003,87,77-86).Up till now, TiO is made
2the method producing photocatalysis under visible light illumination mainly contains: to TiO
2carry out dye photoactivation process, to TiO
2carry out metal ion mixing and with semiconductors coupling (Cronemeyer D C etc., Phys. Rev, 1959,113,1222) etc.Though these methods can improve the utilization rate to visible ray to a certain extent, also there is degradation defect under sensitizer poor chemical stability, heat endurance simultaneously.Some researchers have reported that N replaces a small amount of Lattice Oxygen and can make TiO
2energy gap narrow, and realize while not reducing UV active visible light catalytic response, pulled open nonmetal doping TiO
2the prelude (Sakthivel S etc., Angew. Chem. Int. Ed, 2003,42,4908-4910) of research.Bibliographical information, TiO
2by OH free radical (Khan S U M etc., Science, 2002,297,2243-2245) can be produced through excited by visible light after the doping vario-property of carbon atom.The TiO by Hydrolysis of Titanium alkoxide preparation
2-C, its photocatalytic activity more much higher than the sample mixing N (Bickley I B etc., J. Solid. State. Chem, 1991,92,178-190).Therefore, the study hotspot be prepared into as people of the titanium dioxide of carbon dope.
Because mesoporous carbon CMK-3 has higher specific area, very strong adsorption capacity and excellent electric conductivity, not only can strengthen organic adsorption capacity, and transmittability (the Chai G S etc. of electronics can be strengthened, J. Phys. Chem. B, 2004,108,7074-7079).When composite catalyst is under ultraviolet excitation, CMK-3 wherein, as the acceptor of electronics, easily receives TiO
2the light induced electron of conduction band, suppresses TiO
2the right compound of light induced electron and hole, thus improve TiO
2photo-quantum efficiency.Therefore mesoporous carbon can as desirable catalyst carrier, with CMK-3 to TiO
2carry out study on the modification significant to the design of catalysis material from now on, preparations and applicatio.
The present invention take mesoporous carbon CMK-3 as carrier, adopts sol-gel process to prepare CMK-3/TiO
2composite granule, and have studied it under ultraviolet light to the photocatalysis performance of methylene blue.Owing to having mesoporous carbon CMK-3 to TiO
2carry out modification, CMK-3/TiO
2compound is cashed out than TiO in document
2the better photocatalysis performance of compound (Jianwen Shi etc., Catal. Commun, 2008,9,1846 – 1850).
Summary of the invention
The object of the invention is proposing one with mesoporous carbon CMK-3 is carrier, by sol-gel process, prepares the CMK-3/TiO possessing high efficiency photocatalysis performance
2the method of compound.
There is the compound colloidal sol preparation method of high efficiency photocatalysis performance, carry out according to following step:
(1) preparation of mesoporous carbon CMK-3: 1 g silicon-based mesoporous molecular sieve SBA-15 to be joined in vitriolated aqueous sucrose solution (by 1.25 g sucrose, the dense H of 0.14 g
2sO
4, 5 g water preparations), stir.Mixture is placed in 100 DEG C of baking oven insulation 6h, rises to 160 DEG C of insulation 6h subsequently.By the pitchy sample grinding obtained, continue 0.75 g sucrose, the dense H of 0.1 g
2sO
4, 5 g water join in the sample of milled, stir, and carry out same heat treatment.Gained sample is placed in tube furnace, at N
2the lower temperature programming to 900 DEG C (less than 600 DEG C heating rates, 1 DEG C/min, 600 DEG C ~ 900 DEG C heating rates, a 5 DEG C/min) of protection keeps 3h, completes whole carbonisation.The HF of the sample 5wt% after carbonization floods 24h and removes template, and then high speed centrifugation deionized water is constantly washed, dry CMK-3.
(2) CMK-3/TiO
2the preparation of compound: according to the proportioning (mass ratio) of reaction raw materials, m (CMK-3): m (TiO
2)=0.005 ~ 0.1, is synthesized by sol-gel process; 9ml butyl titanate is dissolved in 36ml ethanol, stir 60min, obtain solution (1), by 4 concentrated hydrochloric acids, 3ml distilled water and the mixing of 36ml absolute ethyl alcohol, obtain solution (2), solution (2) is joined in solution (1) and continue to stir, add a certain amount of mesoporous carbon CMK-3 after colloidal sol to be formed, after continuing to stir a period of time, leave standstill and form gel.By after gel 60 DEG C of dry 5h of obtaining, be placed in tube furnace in N
2under atmosphere with the ramp of 5 DEG C/min to uniform temperature (350 DEG C ~ 550 DEG C), insulation 2h, take out, naturally cooling, grind into powder, obtains the composite of different CMK-3 content.Wherein preferred version is m (CMK-3): m (TiO according to raw material mass mixture ratio
2)=0.01.Sintering temperature in tube furnace is set to 450 DEG C.
Advantage of the present invention: CMK-3/TiO synthesized in this way
2compound, utilizes CMK-3 to TiO
2carried out modification, sample has meso-hole structure, and containing Detitanium-ore-type TiO
2and rutile TiO
2, have efficient photocatalysis performance, the interior degradation rate to methylene blue of 60min is close to 100% under ultraviolet light.CMK-3/TiO is prepared by sol-gel process
2compound, cost is lower, easy and simple to handle.With the TiO in document
2compound and business TiO
2compare, there is more efficient photocatalytic activity.
Accompanying drawing explanation
Fig. 1: embodiment 1 prepares the TEM figure of sample,
Fig. 2: embodiment 1 prepares the UV Vis spectrogram of sample,
Fig. 3: different m (CMK-3): m (TiO
2) prepare the N of sample
2absorption/desorption isothermal curve and graph of pore diameter distribution (0.5wt%CMK-3/TiO
2),
Fig. 4: different m (CMK-3): m (TiO
2) prepare the N of sample
2absorption/desorption isothermal curve and graph of pore diameter distribution (1wt%CMK-3/TiO
2),
Fig. 5: different m (CMK-3): m (TiO
2) prepare the N of sample
2absorption/desorption isothermal curve and graph of pore diameter distribution (5wt%CMK-3/TiO
2),
Fig. 6: different m (CMK-3): m (TiO
2) prepare the N of sample
2absorption/desorption isothermal curve and graph of pore diameter distribution (10wt%CMK-3/TiO
2),
Fig. 7: the XRD spectra (a:1wt%CMK-3/TiO preparing sample under different roasting
2-do not burn; B:1wt%CMK-3/ TiO
2-350; C:1wt%CMK-3/ TiO
2-450; D:1wt%CMK-3/ TiO
2-550),
Fig. 8: different m (CMK-3): m (TiO
2) prepare the photocatalytic degradation curve map of sample,
Fig. 9: the photocatalytic degradation curve map preparing sample under different sintering temperature.
Detailed description of the invention
With regard to specific embodiment, the present invention will be further described below
Embodiment 1
First synthesize a certain amount of mesoporous carbon CMK-3 according to the method (Jun S etc., J. Am. Chem. Soc, 2000,122:10712-10713) in document, then be m (CMK-3): m (TiO according to raw material mass mixture ratio
2)=0.01, adopts sol-gel process to prepare CMK-3/TiO
2compound.Concrete operation step is: 9ml butyl titanate is dissolved in 36ml ethanol, stir 60min, obtain solution (1), by 4 concentrated hydrochloric acids, 3ml distilled water and the mixing of 36ml absolute ethyl alcohol, obtain solution (2), solution (2) is joined in solution (1) and continue to stir, add the mesoporous carbon CMK-3 of 62.5mg after colloidal sol to be formed, after continuing to stir a period of time, leave standstill and form gel.By after gel 60 DEG C of dry 5h of obtaining, be placed in tube furnace in N
2with the ramp to 450 DEG C of 5 DEG C/min under atmosphere, insulation 2h, takes out, and naturally cool, grind into powder, obtains product, is denoted as 1wt%CMK-3/ TiO
2-450.Its specific area is 30.38 m
2/ g, average pore size is distributed as 3.80 nm.The pore passage structure of CMK-3 indistinctly can be seen TEM figure (see figure 1), because the CMK-3 ratio of doping is less, TiO
2particle is substantially coated by CMK-3.In addition as can be seen from the UV-Vis spectrogram (see figure 2) of sample, CMK-3/TiO
2the ABSORPTION EDGE of composite and TiO
2aBSORPTION EDGE compare and there occurs obvious red shift, the absorption in ultraviolet-visible light region is strengthened, and improves the utilization rate of catalyst to light.
Embodiment 2
According to the method for embodiment 1, change m (CMK-3): m (TiO
2) mass ratio, namely change the addition of mesoporous carbon CMK-3.Respectively according to m (CMK-3): m (TiO
2)=0.005, the ratio of 0.05,0.1, adds the mesoporous carbon CMK-3 of respective quality, synthesizes, and has synthesized three kinds of CMK-3/TiO according to three kinds of different ratios
2compound.Be denoted as 0.5wt%CMK-3/ TiO respectively
2-450,5wt%CMK-3/ TiO
2-450,10wt%CMK-3/ TiO
2-450.The N of sample
2adsorption isotherm is IV type (see Fig. 3-6).
Embodiment 3
According to the method for embodiment 1, keep the proportioning of component constant, the sintering temperature changing tube furnace is respectively 350 DEG C and 550 DEG C, and insulation 2h, obtains product and be denoted as 1wt%CMK-3/ TiO respectively
2-350,1wt%CMK-3/ TiO
2-550.The XRD spectra of sample is shown in Fig. 7.In XRD spectra, the composite 1wt%CMK-3/ TiO after 450 DEG C of roastings
2there is Detitanium-ore-type TiO in the XRD figure of-450
2and rutile TiO
2characteristic diffraction peak, according to the literature, possess the TiO of these two kinds of crystal formations
2there is good photocatalytic activity, in this light-catalyzed reaction also below, obtain confirmation.
Embodiment 4
According to the method for embodiment 2, change m (CMK-3): m (TiO
2) mass ratio, prepare compound 0.5wt%CMK-3/ TiO
2-450,5wt%CMK-3/ TiO
2-450,10wt%CMK-3/ TiO
2-450.By the compound 1wt%CMK-3/ TiO prepared in these three kinds of compounds and embodiment 1
2-450 carry out photocatalysis mensuration together.See from measurement result (see figure 8), in mass ratio m (CMK-3): m (TiO
2the compound 1wt%CMK-3/ TiO that)=0.01 is made
2the photocatalytic activity of-450 is best.
Embodiment 5
According to the method for embodiment 3, change the sintering temperature of tube furnace, prepare compound 1wt%CMK-3/ TiO
2-350,1wt%CMK-3/ TiO
2-550.By the compound 1wt%CMK-3/ TiO prepared in these two kinds of compounds and embodiment 1
2-450 carry out photocatalysis mensuration together.See from measurement result (see figure 9), the compound 1wt%CMK-3/ TiO after 450 DEG C of roastings
2the photocatalytic activity of-450 is best.
Claims (6)
1. there is the compound colloidal sol preparation method of high efficiency photocatalysis performance, it is characterized in that carrying out according to following step:
(1) preparation of mesoporous carbon CMK-3: 1 g silicon-based mesoporous molecular sieve SBA-15 is joined in vitriolated aqueous sucrose solution, stirs;
Mixture is placed in 100 DEG C of baking oven insulation 6h, rises to 160 DEG C of insulation 6h subsequently; By the pitchy sample grinding obtained, continue 0.75 g sucrose, the dense H of 0.1 g
2sO
4, 5 g water join in the sample of milled, stir, and carry out same heat treatment;
Gained sample is placed in tube furnace, at N
2the lower temperature programming to 900 DEG C of protection keeps 3h, completes whole carbonisation;
The HF of the sample 5wt% after carbonization floods 24h and removes template, and then high speed centrifugation deionized water is constantly washed, dry CMK-3;
(2) CMK-3/TiO
2the preparation of compound: according to the proportioning of reaction raw materials, synthesized by sol-gel process; 9ml butyl titanate is dissolved in 36ml ethanol, stir 60min, obtain solution (1), by 4 concentrated hydrochloric acids, 3ml distilled water and the mixing of 36ml absolute ethyl alcohol, obtain solution (2), solution (2) is joined in solution (1) and continue to stir, add a certain amount of mesoporous carbon CMK-3 after colloidal sol to be formed, after continuing to stir a period of time, leave standstill and form gel;
By after gel 60 DEG C of dry 5h of obtaining, be placed in tube furnace in N
2under atmosphere with the ramp of 5 DEG C/min to uniform temperature (350 DEG C ~ 550 DEG C), insulation 2h, take out, naturally cooling, grind into powder, obtains the composite of different CMK-3 content.
2. the compound colloidal sol preparation method with high efficiency photocatalysis performance according to claim 1, is characterized in that by 1.25 g sucrose in step (1) vitriolated aqueous sucrose solution, the dense H2SO4 of 0.14 g, 5 g water preparations.
3. the compound colloidal sol preparation method with high efficiency photocatalysis performance according to claim 1, is characterized in that step (1) is at N
2the lower temperature programming to 900 of protection is DEG C according to less than 600 DEG C heating rates, 1 DEG C/min, and 600 DEG C ~ 900 DEG C heating rates, 5 DEG C/min carries out.
4. the compound colloidal sol preparation method with high efficiency photocatalysis performance according to claim 1, is characterized in that the proportioning (mass ratio) of step (2) reaction raw materials, m (CMK-3): m (TiO
2)=0.005 ~ 0.1.
5. the compound colloidal sol preparation method with high efficiency photocatalysis performance according to claim 1, is characterized in that in step (2), preferred version is m (CMK-3): m (TiO according to raw material mass mixture ratio
2)=0.01.
6. the compound colloidal sol preparation method with high efficiency photocatalysis performance according to claim 1, is characterized in that the sintering temperature in step (2) in tube furnace is set to 450 DEG C.
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| CN105330329A (en) * | 2015-11-23 | 2016-02-17 | 安徽农业大学 | Porous TiO2 ceramic adopting poplar microstructure |
| CN106693943A (en) * | 2016-12-14 | 2017-05-24 | 华南农业大学 | Mesoporous activated carbon/titanium dioxide photocatalyst for degrading colored sewage and preparation method and application thereof |
| CN108371951A (en) * | 2017-12-27 | 2018-08-07 | 浙江笨鸟科技有限公司 | A kind of mesoporous support type air cleaning catalyst and preparation method thereof |
| CN111185152A (en) * | 2020-01-14 | 2020-05-22 | 北京工业大学 | Multifunctional coupled PAC/Bi2O3/TiO2Method for preparing composite material |
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Cited By (5)
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|---|---|---|---|---|
| CN105330329A (en) * | 2015-11-23 | 2016-02-17 | 安徽农业大学 | Porous TiO2 ceramic adopting poplar microstructure |
| CN106693943A (en) * | 2016-12-14 | 2017-05-24 | 华南农业大学 | Mesoporous activated carbon/titanium dioxide photocatalyst for degrading colored sewage and preparation method and application thereof |
| CN108371951A (en) * | 2017-12-27 | 2018-08-07 | 浙江笨鸟科技有限公司 | A kind of mesoporous support type air cleaning catalyst and preparation method thereof |
| CN111185152A (en) * | 2020-01-14 | 2020-05-22 | 北京工业大学 | Multifunctional coupled PAC/Bi2O3/TiO2Method for preparing composite material |
| CN111185152B (en) * | 2020-01-14 | 2023-03-10 | 北京工业大学 | Multifunctional coupled PAC/Bi 2 O 3 /TiO 2 Method for preparing composite material |
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