CN103349971B - Porous carbon loaded titanium dioxide composite manufactured by utilizing ionic liquid/polyaniline and method and application thereof - Google Patents
Porous carbon loaded titanium dioxide composite manufactured by utilizing ionic liquid/polyaniline and method and application thereof Download PDFInfo
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- CN103349971B CN103349971B CN201310311705.0A CN201310311705A CN103349971B CN 103349971 B CN103349971 B CN 103349971B CN 201310311705 A CN201310311705 A CN 201310311705A CN 103349971 B CN103349971 B CN 103349971B
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Abstract
The invention discloses a porous carbon loaded titanium dioxide composite manufactured by utilizing ionic liquid/polyaniline and a method and an application thereof. The method comprises the following steps: preparing titanium dioxide collosol by using a sol-gel method, adding ionic liquid making up 1.0 wt%-8.0 wt%, and aniline making up 0.1 wt%-10.0 wt% of the collosol to the collosol, mixing uniformly, and adding oxidant to trigger the polymerization of aniline; still standing and ageing the collosol for 3-5 days, placing the collosol to a drying oven to dry at the temperature of 60-120 DEG C; calcining the obtained compound after milling in nitrogen atmosphere at the temperature of 450-850 DEG C for 30 min-2 h to allow polyaniline to be carbonized, so as to obtain the porous carbon loaded titanium dioxide composite. With the assist of ionic liquid, titanium dioxide and polyaniline are synthesized synchronously, and form a mutually cross-linked and penetrated special structure; the calcination in nitrogen atmosphere allows the polyaniline to be carbonized and titanium dioxide to sediment on a polymer residual carbon frame, and simultaneously realizes the nonmetal adulteration for titanium dioxide. The composite material manufactured by the method has stronger light absorption ability both in ultraviolet and visible light areas, and excellent photocatalysis property and well adsorptive property both in ultraviolet and visible light.
Description
Technical field
The present invention relates to a kind of porous carbon carried titanium dioxide composite utilizing ionic liquid/polyaniline to prepare and its preparation method and application.
Background technology
Titanium dioxide is a kind of efficient, nontoxic, photochemical catalyst that stable chemical nature, anti-photooxidation are strong, cheap.Optically catalytic TiO 2/photo-electrocatalytic technology causes extensive attention in organic wastewater exhaust-gas treatment application aspect that is poisonous, bio-refractory.Nano titanium dioxide degradable efficiency is high, but can only carry out light-catalyzed reaction under UV-irradiation, and the separation rate in its light induced electron and hole still has much room for improvement.For promoting titanium dioxide photocatalysis performance under visible light, the composite preparing titanium dioxide becomes one of emphasis direction of titanium dioxide research.The materials such as metal, metal oxide, graphite, organic matter are all for the preparation of composite titania material.
Utilize template can prepare specific modality titanium dioxide or to titanium dioxide pore-creating.The titanium dioxide with pore passage structure has larger specific area and stronger effect of mass transmitting, thus has stronger photocatalysis performance.The non-surface-active agents such as surfactant and glucose such as polyethers, polyethylene glycol and softex kw are the template comparatively commonly used.Polyaniline is typical conducting polymer composite, due to its structure diversification, good, the easy processing of environmental stability, cheap and become the study hotspot of conducting polymer.Polyaniline can be used as the titanium dioxide of Template preparation specific form, also improves the photocatalysis performance of titanium dioxide by parcel.Ionic liquid, in the process preparing titanium dioxide, can play the effect of template and catalyst, also may realize, to element dopings such as N, F of titanium dioxide, improving the photocatalysis performance of titanium dioxide under ultraviolet light and visible ray.Anaerobic high-temperature calcination can make the abundant carbonization of carbonaceous material, thus makes material possess stronger absorption property; Simultaneously under blanket of nitrogen, high-temperature calcination titanium dioxide also may realize adulterating to the N of titanium dioxide, thus improves its photocatalysis performance under visible light.Have not been reported with polyaniline, the blended method preparing specific form and functional form titanium dioxide of ionic liquid.
Summary of the invention
The object of the invention is to provide a kind of ionic liquid, polyaniline to participate in porous carbon carried titanium dioxide composite of preparation and preparation method thereof for the deficiencies in the prior art.
Thinking of the present invention is: by making titanium dioxide and polyaniline synchronized compound, allows both form the crosslinked special construction run through mutually.By adding the calcining under ionic liquid, carbonaceous material and blanket of nitrogen, realizing the nonmetal doping to titanium dioxide, making polyaniline carbonization simultaneously, make the absorbing wavelength scope of titanium dioxide move to visible ray further, improve the photocatalysis performance under its visible ray.Polyaniline carbonization also makes this composite become the composite possessing good adsorbent/photocatalysis performance.
Utilize ionic liquid/polyaniline to prepare a method for porous carbon carried titanium dioxide composite, comprise the steps:
A, prepare TiO 2 sol by sol-gel process, colloidal sol adds the ionic liquid accounting for colloidal sol 1.0wt% ~ 8.0wt%, the aniline of 0.1wt% ~ 10.0wt% after stirring 10 ~ 30min wherein, stirs 10 ~ 30min, mixes;
B, get the oxidant accounting for colloidal sol 0.1wt% ~ 10.0wt%, be made into the protonic acid solution of 0.2wt%-0.6wt%, dropwise join in above-mentioned steps A gained collosol intermixture and cause aniline polymerization; Dropwise rear Keep agitation 2 ~ 6h;
C, by 60 DEG C ~ 120 DEG C oven dry of rearmounted for still aging for colloidal sol 3 ~ 5d baking oven;
D, mill after gained compound is calcined 30min ~ 2h at 450 ~ 850 DEG C in blanket of nitrogen, make polyaniline carbonization, obtain porous carbon carried titanium dioxide composite.
Porous carbon carried titanium dioxide composite prepared by described preparation method can be applicable to adsorption-photocatalytic degradation pollutant in waste gas, waste water treatment reactor, especially photocatalytic pollutant degradation under visible ray.
Described porous carbon carried titanium dioxide composite, has stronger absorbing ability in ultraviolet-visible light region, has excellent photocatalysis performance under ultraviolet light and visible ray.
Described porous carbon carried titanium dioxide composite, the loose structure of polyaniline carbonization and material makes this composite have good absorption property.
Described porous carbon carried titanium dioxide composite, compound particle diameter is little, how within the scope of 10 ~ 30nm.
Described porous carbon carried titanium dioxide composite, titanium dioxide and polyaniline form cross-linked structure, and after calcining, most titanium dioxide deposition is on the carbon skeleton that polyaniline is residual.
Described porous carbon carried titanium dioxide composite, its loose structure is obtained compound pore-creating by anaerobic calcining.
Described porous carbon carried titanium dioxide composite, its loose structure is distributed in inside and the surface of composite construction.
The introducing of porous carbon carried titanium dioxide composite due to polyaniline prepared by the present invention and the doping of nonmetalloid, the light absorption range of this composite there occurs obvious red shift compared with pure titinium dioxide, there is larger absorbing ability in ultraviolet-visible light region, under ultraviolet light and visible ray, have excellent photocatalysis performance and excellent absorption property.Obtained titanium dioxide particle diameter is little, and have larger specific area, most titanium dichloride load, on crosslinked carbon skeleton, also improves effect of mass transmitting.Some all improves the catalytic performance of titanium dioxide to the modification of material above.
Accompanying drawing explanation
Fig. 1 embodiment 2 intermediate ion liquid polyaniline participates in the porous carbon carried titanium dioxide composite of preparation;
Sample uv-visible absorption spectra in Fig. 2 embodiment 2;
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.
Embodiment 1: ionic liquid polyaniline participates in the preparation method of the porous carbon carried titanium dioxide composite of preparation, comprises the steps:
(1) prepare TiO 2 sol by sol-gel process, colloidal sol adds the ionic liquid 1-butyl-3-methyl imidazolium tetrafluoroborate accounting for colloidal sol 1.5wt%, the aniline of 0.1wt% after stirring 15min wherein, stirs 15min, mixes;
(2) get the ammonium persulfate accounting for colloidal sol 0.2wt%, be made into the hydrochloric acid solution that concentration is 0.2wt%, dropwise add in above-mentioned collosol intermixture and cause aniline polymerization.Dropwise rear Keep agitation 2h;
(3) by rearmounted for still aging for colloidal sol 3d 60 DEG C, baking oven oven dry;
(4) after milling, gained compound is calcined 1h at 800 DEG C in blanket of nitrogen, make polyaniline carbonization, obtain porous carbon carried titanium dioxide composite.
In 40mL methyl orange solution (20mg/L), add the above-mentioned compound of 50mg, aeration stirs 10min, and percent of decolourization can reach 90%.Discard solution after reaching adsorption equilibrium, rejoin 20mL methyl orange solution (20mg/L), be placed in 300W xenon lamp simulated solar irradiation and irradiate, aeration stirs 8min, and methyl orange degradation rate reaches 89%.
Embodiment 2: ionic liquid polyaniline participates in the preparation method of the porous carbon carried titanium dioxide composite of preparation, comprises the steps:
(1) prepare TiO 2 sol by sol-gel process, colloidal sol adds the ionic liquid 1-butyl-3-methyl imidazolium tetrafluoroborate accounting for colloidal sol 3.0wt%, the aniline of 0.6wt% after stirring 20min wherein, stirs 20min, mixes;
(2) get the ammonium persulfate accounting for colloidal sol 0.8wt%, be made into the hydrochloric acid solution that concentration is 0.4wt%, dropwise add in above-mentioned collosol intermixture and cause aniline polymerization.Dropwise rear Keep agitation 2h;
(3) by rearmounted for still aging for colloidal sol 3d 60 DEG C, baking oven oven dry;
(4) after milling, gained compound is calcined 1h at 700 DEG C in blanket of nitrogen, make polyaniline carbonization, obtain porous carbon carried titanium dioxide composite.
In 40mL methylene blue solution (20mg/L), add the above-mentioned compound of 50mg, aeration stirs 10min, and percent of decolourization can reach 95%.Discard solution after reaching adsorption equilibrium, rejoin 20mL methylene blue solution (20mg/L), irradiate under being placed in sunshine (light intensity 81950lx), aeration stirs 10min, and methyl orange degradation rate reaches 94%.
Fig. 1 is the transmission electron microscope picture that the present embodiment intermediate ion liquid polyaniline participates in the porous carbon carried titanium dioxide composite of preparation, and first titanium dioxide/polyaniline is formed and mutually run through crosslinked structure, and under nitrogen, calcining makes polyaniline carbonization, produces loose structure.Titanium dioxide is distributed on the residual carbon skeleton of polyaniline.
Fig. 2 is the uv-visible absorption spectra comparison diagram of the titanium dioxide prepared under porous carbon carried titanium dioxide composite and the same terms in the present embodiment.With to calcine under nitrogen and compared with the titanium dioxide control group obtained, porous carbon carried titanium dioxide composite all has very strong absorbing ability in Uv and visible light region, absorbability also extends near infrared region, makes this composite under sunshine, have excellent photocatalysis performance.
Embodiment 3: ionic liquid polyaniline participates in the preparation method of the porous carbon carried titanium dioxide composite of preparation, comprises the steps:
(1) prepare TiO 2 sol by sol-gel process, colloidal sol adds the ionic liquid 1-ethylpyridine tetrafluoroborate accounting for colloidal sol 3.0wt%, the aniline of 0.2wt% after stirring 20min wherein, stirs 20min, mixes;
(2) get the ammonium persulfate accounting for colloidal sol 0.3wt%, be made into the hydrochloric acid solution that concentration is 0.6wt%, dropwise add in above-mentioned collosol intermixture and cause aniline polymerization.Dropwise rear Keep agitation 2h;
(3) by rearmounted for still aging for colloidal sol 3d 80 DEG C, baking oven oven dry;
(4) after milling, gained compound is calcined 1h at 600 DEG C in blanket of nitrogen, make polyaniline carbonization, obtain porous carbon carried titanium dioxide composite.
In 40mL methylene blue solution (20mg/L), add the above-mentioned compound of 50mg, aeration stirs 10min, and percent of decolourization can reach 88%.Discard solution after reaching adsorption equilibrium, rejoin 20mL methylene blue solution (20mg/L), under being placed in sunshine (light intensity 73560lx)) irradiate, aeration stirs 20min, and methyl orange degradation rate reaches 84%.
As a comparison, with pure titinium dioxide, simulating pollution thing methyl orange, methylene blue are degraded under the same terms.
Result of the test shows: pure titinium dioxide is respectively 84% and 86% to the degradation rate of methyl orange and methylene blue under Hg lamp irradiation, under xenon lamp, 28% and 30% are respectively to the degradation rate of methyl orange and methylene blue, all lower than the degradation rate of composite to dyestuff, pure titinium dioxide does not almost have degradation capability to methyl orange and methylene blue under sunshine.Illustrate that composite all has good photocatalysis under ultraviolet light and visible ray.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (7)
1. utilize ionic liquid/polyaniline to prepare a method for porous carbon carried titanium dioxide composite, it is characterized in that, comprise the steps:
A, prepare TiO 2 sol by sol-gel process, after colloidal sol stirs 10 ~ 30min, add the ionic liquid accounting for colloidal sol 1.0wt% ~ 8.0wt% wherein, described ionic liquid is 1-butyl-3-methyl imidazolium tetrafluoroborate or 1-ethylpyridine tetrafluoroborate, the aniline of 0.1wt% ~ 10.0wt%, stir 10 ~ 30min, mix;
B, get the oxidant accounting for colloidal sol 0.1wt% ~ 10.0wt%, be made into the protonic acid solution of 0.2wt%-0.6wt%, dropwise join in above-mentioned steps A gained collosol intermixture and cause aniline polymerization; Dropwise rear Keep agitation 2 ~ 6h;
C, by 60 DEG C ~ 120 DEG C oven dry of rearmounted for still aging for colloidal sol 3 ~ 5d baking oven;
D, mill after gained compound is calcined 30min ~ 2h at 450 ~ 850 DEG C in blanket of nitrogen, make polyaniline carbonization, obtain porous carbon carried titanium dioxide composite.
2. the method for claim 1, is characterized in that, specifically comprises the following steps:
(1) prepare TiO 2 sol by sol-gel process, colloidal sol adds the ionic liquid 1-butyl-3-methyl imidazolium tetrafluoroborate accounting for colloidal sol 1.5wt%, the aniline of 0.1wt% after stirring 15min wherein, stirs 15min, mixes;
(2) get the ammonium persulfate accounting for colloidal sol 0.2wt%, be made into the hydrochloric acid solution that concentration is 0.2wt%, dropwise add in above-mentioned collosol intermixture and cause aniline polymerization; Dropwise rear Keep agitation 2h;
(3) by rearmounted for still aging for colloidal sol 3d 60 DEG C, baking oven oven dry;
(4) after milling, gained compound is calcined 1h at 800 DEG C in blanket of nitrogen, make polyaniline carbonization, obtain porous carbon carried titanium dioxide composite.
3. the method for claim 1, is characterized in that, specifically comprises the following steps:
(1) prepare TiO 2 sol by sol-gel process, colloidal sol adds the ionic liquid 1-butyl-3-methyl imidazolium tetrafluoroborate accounting for colloidal sol 3.0wt%, the aniline of 0.6wt% after stirring 20min wherein, stirs 20min, mixes;
(2) get the ammonium persulfate accounting for colloidal sol 0.8wt%, be made into the hydrochloric acid solution that concentration is 0.4wt%, dropwise add in above-mentioned collosol intermixture and cause aniline polymerization; Dropwise rear Keep agitation 2h;
(3) by rearmounted for still aging for colloidal sol 3d 60 DEG C, baking oven oven dry;
(4) after milling, gained compound is calcined 1h at 700 DEG C in blanket of nitrogen, make polyaniline carbonization, obtain porous carbon carried titanium dioxide composite.
4. the method for claim 1, is characterized in that, specifically comprises the following steps:
(1) prepare TiO 2 sol by sol-gel process, colloidal sol adds the ionic liquid 1-ethylpyridine tetrafluoroborate accounting for colloidal sol 3.0wt%, the aniline of 0.2wt% after stirring 20min wherein, stirs 20min, mixes;
(2) get the ammonium persulfate accounting for colloidal sol 0.3wt%, be made into the hydrochloric acid solution that concentration is 0.6wt%, dropwise add in above-mentioned collosol intermixture and cause aniline polymerization; Dropwise rear Keep agitation 2h;
(3) by rearmounted for still aging for colloidal sol 3d 80 DEG C, baking oven oven dry;
(4) after milling, gained compound is calcined 1h at 600 DEG C in blanket of nitrogen, make polyaniline carbonization, obtain porous carbon carried titanium dioxide composite.
5. the porous carbon carried titanium dioxide composite that the method as described in as arbitrary in claim 1-4 prepares, it is characterized in that, titanium dioxide and polyaniline are formed to be cross-linked with each other and run through structure, and after calcining, most titanium dioxide deposition is on the carbon skeleton that polyaniline is residual.
6. porous carbon carried titanium dioxide composite as claimed in claim 5, is characterized in that: compound particle diameter is nanoscale, within the scope of 10 ~ 30nm.
7. the application of porous carbon carried titanium dioxide composite as claimed in claim 5, is characterized in that: be applied to adsorption-photocatalytic degradation pollutant in waste gas, waste water treatment reactor.
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| CN108479857B (en) * | 2018-04-14 | 2021-04-27 | 扬州工业职业技术学院 | Preparation method of ionic liquid modified polyaniline/titanium dioxide composite material |
| CN110718396B (en) * | 2019-10-15 | 2021-07-06 | 哈尔滨工业大学 | TiO 22Preparation method and application of/ionic liquid hybridized n-type polyaniline film |
| CN111606405A (en) * | 2020-06-03 | 2020-09-01 | 北京林业大学 | Method for degrading organic pollutants in water by activating peracetic acid through nitrogen-doped carbon material |
| WO2023039880A1 (en) * | 2021-09-18 | 2023-03-23 | 中国科学院理化技术研究所 | Synthesis method for cold incineration catalyst and catalyst prepared thereby |
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| EP1393803A1 (en) * | 2001-03-29 | 2004-03-03 | Ecodevice Corporation | Light-responsive material and method of manufacturing the same |
| CN103143338A (en) * | 2013-03-21 | 2013-06-12 | 四川农业大学 | Porous titanium dioxide/graphene composite material and preparation method thereof |
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