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WO2011049085A1 - Photocatalyseur contenant du nitrure de carbone, son procédé de fabrication et procédé de purification d'air à l'aide du photocatalyseur - Google Patents

Photocatalyseur contenant du nitrure de carbone, son procédé de fabrication et procédé de purification d'air à l'aide du photocatalyseur Download PDF

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WO2011049085A1
WO2011049085A1 PCT/JP2010/068385 JP2010068385W WO2011049085A1 WO 2011049085 A1 WO2011049085 A1 WO 2011049085A1 JP 2010068385 W JP2010068385 W JP 2010068385W WO 2011049085 A1 WO2011049085 A1 WO 2011049085A1
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carbon nitride
photocatalyst
graphite
treatment
aqueous solution
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Japanese (ja)
Inventor
泰三 佐野
浩士 竹内
信彰 根岸
力 平川
咲子 筒井
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National Institute of Advanced Industrial Science and Technology AIST
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
    • B01J35/39—Photocatalytic properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8678—Removing components of undefined structure
    • B01D53/8687—Organic components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/24—Nitrogen compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J35/61—Surface area
    • B01J35/613—10-100 m2/g
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/08—Heat treatment
    • B01J37/10—Heat treatment in the presence of water, e.g. steam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/202—Alkali metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/70—Non-metallic catalysts, additives or dopants
    • B01D2255/702—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/80—Type of catalytic reaction
    • B01D2255/802—Photocatalytic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/702—Hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/90—Odorous compounds not provided for in groups B01D2257/00 - B01D2257/708
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/06—Polluted air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/45—Gas separation or purification devices adapted for specific applications
    • B01D2259/4508—Gas separation or purification devices adapted for specific applications for cleaning air in buildings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
    • B01D2259/802—Visible light

Definitions

  • the present invention relates to a photocatalyst, a method for producing the photocatalyst, and an air purification method using the photocatalyst, and more particularly, to a photocatalyst having improved visible light responsiveness.
  • Titanium oxide is a typical example and exhibits a strong photocatalytic activity.
  • titanium oxide has a large band gap and does not absorb visible light that occupies most of the sunlight and is active only to ultraviolet light, it cannot fully utilize sunlight, and ultraviolet light is extremely weak. There were issues such as not functioning indoors. Therefore, various improvements have been made so that visible light can be used.
  • Patent Document 1 describes that a photocatalyst exhibiting a high photocatalytic action can be obtained by irradiation with visible light by mixing and baking ammonia or a substance that generates ammonia by heating and a titanium compound.
  • Patent Document 2 describes titanium hydroxide containing 3.3% or more of nitrogen, and a photocatalyst obtained by firing the titanium hydroxide.
  • semiconductors such as tungsten oxide are capable of absorbing visible light because they have a smaller band gap than titanium oxide, and are expected as visible light active photocatalysts (visible light responsive photocatalysts) ( Patent Documents 3 and 4). These visible light responsive photocatalysts often promote their activity using a promoter such as platinum, palladium, or copper compound.
  • Non-patent Document 1 graphite-like carbon nitride has been proposed (Non-patent Document 1). It has been known since the 1980s that this graphite-like carbon nitride powder can be synthesized by pyrolyzing melamine or cyanamide, but the catalytic action has not been studied until recently, and in fact, the graphite-like powder synthesized from melamine Even if carbon nitride is used as it is, there is almost no catalytic activity. However, the literature 1 reports that the activity is improved by supporting platinum or ruthenium and it can be used for water photolysis (hydrogen generation, oxygen generation). ing.
  • non-patent document 2 synthesizes ultrafine-grained graphite-like carbon nitride using silica as a template, and synthesizes graphite-like carbon nitride with a high specific surface area by removing silica with hydrofluoric acid.
  • the photocatalytic activity is not evaluated.
  • titanium oxide decomposes organic substances contained in the adhesive and paint, it is necessary to use an inorganic adhesive or paint that does not contain organic substances when titanium oxide is used. Furthermore, titanium oxide has good compatibility with inorganic materials such as glass and concrete, but has a problem that it has poor compatibility with organic materials.
  • Tungsten oxide-based semiconductors are expected to be visible light-responsive photocatalysts, but their price is about 10 times that of titanium oxide, and the supply is unstable because they are strategic substances. There is also. Further, the graphite-like carbon nitride powder does not have catalytic activity as it is, and some activation means is necessary. However, the activation means using platinum or ruthenium described in Non-Patent Document 1 is expensive, and hydrofluoric acid is used. There is a problem that the synthesis method of Non-Patent Document 2 used is dangerous.
  • the present invention has been made in view of the above circumstances, and provides a photocatalyst obtained by a cheaper and safer method and responsive to not only ultraviolet light but also visible light, and a method for producing the same. It is intended.
  • a photocatalyst comprising, as an active ingredient, powder obtained by subjecting graphite-like carbon nitride powder to an alkali treatment or an acid treatment.
  • the treatment is a heat treatment in an alkaline aqueous solution or an acidic aqueous solution.
  • the present invention it is possible to obtain a photocatalyst by an inexpensive and safe method, and the obtained photocatalyst can utilize the photocatalytic action using visible light even if the ultraviolet light is insufficient in the room. Therefore, titanium oxide and tungsten oxide currently used as photocatalysts can be replaced with inexpensive materials.
  • combination of graphite-like carbon nitride The figure which shows the electron spin resonance (ESR) spectrum of the graphite-like carbon nitride obtained by adding sodium hydroxide aqueous solution and heat-processing at 90 degreeC for 20 hours.
  • strength of the ESR signal observed in g 2.004 vicinity of the ESR spectrum of graphite-like carbon nitride, and the calcination temperature at the time of the synthesis
  • FIG 3 is a powder X-ray diffraction diagram of graphitic carbon nitride.
  • the figure which shows the enlarged part of the main peak in FIG. The figure which shows the profile of the NOx removal test by the graphite-like carbon nitride powder which heat-processed for 90 hours at 130 degreeC by adding sodium hydroxide aqueous solution.
  • the photocatalyst having visible light responsiveness of the present invention is characterized in that its photocatalytic activity is improved by treating graphite-like carbon nitride powder in an alkaline aqueous solution or an acidic aqueous solution. That is, by treating the graphite-like carbon nitride in an alkaline solution or an acidic solution, the specific surface area is increased and the photocatalytic activity is improved.
  • the present invention will be described in more detail using specific measurement results.
  • Graphite-like carbon nitride was synthesized as follows. 30 g of melamine (manufactured by Wako Pure Chemical Industries, Ltd.) is placed in an alumina crucible, covered, baked in an electric furnace at 550 ° C. for 1 hour, the product is ground in a mortar, and then placed in a crucible again for 550 hours. Baked at °C. The resulting yellow powder was ground in a mortar to obtain graphite-like carbon nitride powder.
  • melamine manufactured by Wako Pure Chemical Industries, Ltd.
  • the alkali treatment of graphite-like carbon nitride was performed as follows. 1.0 g of the graphite-like carbon nitride powder and 100 ml of a 0.10 mol / l aqueous solution of sodium hydroxide (Wako Pure Chemical Industries) are placed in a crucible made of Teflon (registered trademark), and sodium hydroxide is utilized using an ultrasonic generator. Was dissolved. At this time, the sodium hydroxide concentration was 0.1 mol / l, and the pH at room temperature was 13. When changing the pH of the solution, the concentration of sodium hydroxide was appropriately changed.
  • a Teflon crucible was placed in a stainless steel jacket and heated while stirring with a magnetic stirrer. The temperature was measured using a thermocouple at the top of the stainless steel jacket, and the temperature was adjusted using a temperature controller, slidac, and mantle heater. After heating at a predetermined temperature for 20 hours, it was allowed to cool to room temperature. The suspension in the Teflon crucible was centrifuged to obtain a precipitate.
  • the acid treatment of graphite-like carbon nitride was performed as follows. 1.0 g of graphite-like carbon nitride powder obtained by baking the melamine and 100 ml of 0.2 mol / l hydrochloric acid (Wako Pure Chemical Industries) were placed in a Teflon crucible and stirred using an ultrasonic generator. . When changing the pH of the solution, the amount of concentrated hydrochloric acid was appropriately changed.
  • an acid other than hydrochloric acid for example, sulfuric acid or nitric acid
  • concentration of an acid reagent manufactured by Wako Pure Chemical Industries, Ltd.
  • Wako Pure Chemical Industries, Ltd. the concentration of an acid reagent added as appropriate was adjusted so that the hydrogen ion concentration was comparable.
  • a Teflon crucible was placed in a stainless steel jacket and heated while stirring with a magnetic stirrer. The temperature was measured using a thermocouple at the top of the stainless steel jacket, and the temperature was adjusted using a temperature controller, slidac, and mantle heater. After heating at a predetermined temperature for 20 hours, it was allowed to cool to room temperature. The suspension in the Teflon crucible was centrifuged to obtain a precipitate. The process of washing the precipitate with water by adding 30 ml of water to the precipitate and stirring and centrifuging was repeated several times to obtain acid-treated graphite-like carbon nitride.
  • FIG. 1 shows the specific surface area ( ⁇ ) of graphite-like carbon nitride powder obtained by baking melamine at different temperatures for 2 hours in the production of the above-mentioned graphite-like carbon nitride powder, and the graphite-like carbon nitride powder is hydroxylated.
  • the specific surface area was measured by a multipoint BET method using nitrogen as an adsorbate.
  • FIG. 2 shows the NOx removal rate ( ⁇ ) of the graphite-like carbon nitride powder obtained by baking the melamine at different temperatures for 2 hours, and the aqueous solution of sodium hydroxide (concentration 0.1 mol / wt). It is a figure which shows the relationship between NOx removal rate ((circle)) of the graphite-like carbon nitride powder obtained by adding L) and heat-processing at 90 degreeC for 20 hours, and a calcination temperature. The NOx removal rate was measured as follows.
  • 0.2 g of the treated g-C 3 N 4 was suspended in a small amount of water, the whole amount was applied to a glass plate having a width of 50 mm and a length of 100 mm, and dried at 50 ° C. to prepare a photocatalyst test piece.
  • the test piece was installed in a photocatalytic reaction vessel shown in JIS R1701-1, covered with a Pyrex (registered trademark) lid, and simulated polluted air containing 1.0 ppm of NO gas was circulated at 1.0 L / min. .
  • the humidity was 6% at 25 ° C.
  • the NO and NO 2 gas concentrations in the simulated contaminated air coming out of the reaction vessel were measured with a chemiluminescent NOx measuring device (manufactured by MonitorLabs, 8840). Light from a white fluorescent lamp (Toshiba FL10W) was irradiated to the photocatalyst sample piece at an intensity of 6000 Lx through an ultraviolet light removal filter (Sumitex LF-39 manufactured by Sumitomo Chemical), and the photocatalytic action was observed.
  • a chemiluminescent NOx measuring device manufactured by MonitorLabs, 8840.
  • Light from a white fluorescent lamp (Toshiba FL10W) was irradiated to the photocatalyst sample piece at an intensity of 6000 Lx through an ultraviolet light removal filter (Sumitex LF-39 manufactured by Sumitomo Chemical), and the photocatalytic action was observed.
  • NOx concentration (the sum of NO gas concentration and NO 2 gas concentration) is obtained and ⁇ [NOx concentration when light is not irradiated] ⁇ [NOx concentration when light is irradiated] ⁇ / ⁇ [light is irradiated NOx concentration when not present] ⁇ ⁇ 100 was defined as the NOx removal rate.
  • the sample that was not treated with an aqueous sodium hydroxide solution (hereinafter referred to as “NaOH treatment”) showed a low NOx removal rate regardless of the firing temperature.
  • the NOx removal rate was higher than that before the NaOH treatment, and the NOx removal rate was the highest especially around 550 ° C. From these results, in the method for producing graphite-like carbon nitride described above, graphite-like carbon nitride obtained by firing a carbon nitride raw material in the range of 450 ° C. to 650 ° C., preferably 500 ° C. to 600 ° C.
  • the graphite-like carbon nitride having a high photocatalytic activity can be obtained by treating this in an alkaline aqueous solution. Further, as apparent from the results of FIGS. 1 and 2, it was found that the photocatalytic activity does not increase only by increasing the BET area. This is considered to be related to the radical generation ability described below.
  • ESR Electron spin resonance
  • the composition of the obtained graphite-like carbon nitride varies depending on the firing temperature, but 0.4 ⁇ x ⁇ 0.6. 1.4 ⁇ y ⁇ 3.1 and 0.1 ⁇ z ⁇ 2.5.
  • the results of X-ray diffraction described later showed that the layered compound was like a graphite-like carbon nitride-like, so that incomplete C 3 with defects such as amino groups was present. N 4 was identified.
  • cyanamide is used as a raw material for carbon nitride, or when cyanamide, melamine, and urea are mixed, almost the same results are obtained, so a raw material for carbon nitride other than melamine may be used. A plurality of carbon nitride raw materials may be mixed.
  • each graphite-like carbon nitride obtained by firing at 520 ° C. to 650 ° C. is subjected to the above-mentioned NaOH treatment to obtain graphite-like carbon nitride having an enhanced photocatalytic activity.
  • Table 1 below shows the measurement results of the NOx removal rate and the BET area with the g-C 3 N 4 powder obtained by the various alkali treatments and acid treatments described above.
  • HCl treatment Treatment with hydrochloric acid (hereinafter referred to as “HCl treatment”) was effective when performed at a hydrochloric acid concentration of 0.2 mol / l (pH ⁇ 1), but was effective at a hydrochloric acid concentration of 0.02 mol / l (pH of about 2).
  • HCl treatment Treatment with hydrochloric acid
  • pH ⁇ 1 hydrochloric acid concentration of 0.2 mol / l
  • the hydrochloric acid concentration of 0.02 mol / l pH of about 2
  • the effect was small at 110 ° C. From this, it is considered that a high hydrogen ion concentration and a temperature exceeding 110 ° C. are necessary.
  • the specific surface area is increased to 20 m 2 / g or more regardless of either the alkali treatment or the acid treatment. It is considered that gC 3 N 4 particles were miniaturized by acid treatment or alkali treatment, and the photocatalyst was remarkably improved.
  • FIG. 5 is a diagram showing visible ultraviolet diffuse reflection spectra of gC 3 N 4 and titanium oxide.
  • a broken line indicates a spectrum of titanium oxide (ST-01), and a dotted line indicates an alkali-treated g-
  • the spectrum of C 3 N 4 the solid line is the spectrum of untreated g-C 3 N 4 .
  • Measurement was performed by attaching a diffuse reflection spectrum measurement attachment (ISR-3100) to a visible ultraviolet absorption spectrometer (Shimadzu UV-3600). Barium sulfate was used as a reference substance.
  • titanium oxide absorbs light of about 400 nm or less and can be used for the photocatalytic reaction, and g-C 3 N 4 can absorb visible light having a longer wavelength (up to about 500 nm). Even when NaOH was added and heat-treated, there was no significant change.
  • FIG. 6 is an X-ray powder diffraction pattern of gC 3 N 4 , which was measured with a RU-300 manufactured by RIGAKU.
  • untreated g-C 3 N 4 deionized water, g-C 3 N 4 and 20 hours of heat treatment at 0.99 ° C.
  • aqueous sodium hydroxide was heated at 0.99 ° C. 20 hours g- C 3 N 4 , g-C 3 N 4 that has been heat-treated at 150 ° C. for 20 hours in an aqueous HCl solution.
  • FIG. 7 is a diagram showing an enlarged portion of the main peak, where the solid line indicates untreated g—C 3 N 4 and the broken line indicates NaOH-treated g—C 3 N 4 . 6 and 7, there is a peak peculiar to the layered compound at 27 to 28 °, and it can be seen from the position of this peak that the average of the layer spacing is calculated to be about 3.3 cm, and is gC 3 N 4 .
  • FIG. 9 even when a sodium hydroxide aqueous solution is added and heated, there is almost no change in the diffraction pattern, but in FIG. 7 where the main peak is enlarged, a slight difference is seen.
  • a sodium hydroxide solution is the best, and a potassium hydroxide solution can also be used.
  • a sodium hydroxide solution having a concentration of 1.4 mol / l was used, most of the g-C 3 N 4 was denatured and the recovery rate was lowered, so the concentration was preferably 1.0 mol / l or less, more preferably Uses an alkaline aqueous solution having a concentration of 0.5 mol / l or less.
  • an aqueous solution of a strong acid can be used, but the pH is preferably 1 or less.
  • the treatment with these aqueous solutions is effective to some extent even at room temperature, but the effect is large when performed at 70 ° C. or higher, but the recovery rate of g-C 3 N 4 decreases when it exceeds 130 ° C. It is preferable to process at a temperature not exceeding ° C. Furthermore, the temperature which does not exceed 110 degreeC is preferable. Since activity does not improve even when heated in pure water, it is necessary to heat-treat in an acidic or alkaline aqueous solution.
  • FIG. 8 is a diagram showing a profile of a NOx removal test using gC 3 N 4 powder that was heated for 90 hours at 130 ° C. with an aqueous sodium hydroxide solution (concentration 0.1 mol / L).
  • FIG. 3 is a view showing a profile of a NOx removal test using g-C 3 N 4 powder which was heated at 150 ° C. for 2 hours with hydrochloric acid (concentration 0.2 mol / L) added.
  • the dotted line indicates the NO concentration
  • the dashed line indicates the NO 2 concentration
  • the solid line indicates the NO x (sum of NO and NO 2 ) concentration
  • the horizontal dotted line indicates the initial concentration of NO x .
  • the concentration of NO decreases while the light is applied, and the concentration returns to the original level when the light irradiation is stopped, indicating that a photocatalytic reaction is occurring.
  • Part of NO becomes NO 2 and further becomes HNO 3 and is adsorbed on the photocatalyst and removed from the circulating gas.
  • the area of the portion surrounded by the initial concentration and NOx line corresponds to the removed NOx amount.
  • FIG. 10 shows the NOx removal rate of gC 3 N 4 obtained by adding a sodium hydroxide aqueous solution (concentration 0.1 mol / L) and heat-treating at 90 ° C. for 20 hours, and the wavelength of irradiated light.
  • the horizontal axis represents the transmission limit wavelength of the filter. It was confirmed that gC 3 N 4 can use even visible light having a wavelength near 500 nm. Moreover, since the NOx removal rate with a 345 nm filter is higher than the NOx removal rate with a 400 nm filter, it was confirmed that ultraviolet rays can also be used.
  • FIG. 11 is a diagram showing the relationship between the heating temperature and the NOx removal rate when a sodium hydroxide aqueous solution (concentration 0.1 mol / L) is added and heat-treated for 20 hours.
  • the dotted line in the drawing indicates the NO x removal rate if untreated.
  • a high NOx removal rate is exhibited when the temperature is about 90 ° C. to 130 ° C., and may decrease when the temperature reaches 150 ° C.
  • FIG. 12 is a diagram showing the relationship between the heating time and the NOx removal rate when a sodium hydroxide aqueous solution (concentration 0.1 mol / L) is added and heat treatment is performed at 110 ° C. A high NOx removal rate was exhibited in about 20 hours, and decreased when heated for 90 hours.
  • FIG. 13 is a diagram showing the relationship between the heating temperature and the recovery rate when a sodium hydroxide aqueous solution (concentration: 0.1 mol / L) is added and heat-treated for 20 hours.
  • the recovery rate was defined as (g-C 3 N 4 weight after heat treatment) / (weight before heat treatment) ⁇ 100.
  • a part of g-C 3 N 4 is dissolved by the heat treatment, and is refined and cannot be precipitated in the centrifuge, so that the recoverable amount is reduced. Above 110 ° C., the recovery rate was significantly reduced.
  • Figure 14 is the untreated g-C 3 N 4 powder, and an aqueous solution of sodium hydroxide (concentration 0.1 mol / L) was added to the obtained by 20 hours of heat treatment at 90 °C g-C 3 N 4
  • the measurement was performed as follows. 0.2 g of NaOH-treated g—C 3 N 4 was suspended in a small amount of water, the whole amount was applied to a glass plate having a width of 50 mm and a length of 100 mm, and dried at 50 ° C. to prepare a photocatalyst test piece.
  • the test piece was placed in a photocatalytic reaction vessel shown in JIS R1701-1, covered with a Pyrex lid, and simulated contaminated air containing about 2 ppm of acetaldehyde was circulated at 0.5 L / min. The humidity was 6% at 25 ° C.
  • the concentration of acetaldehyde in the simulated contaminated air coming out of the reaction vessel was measured with a gas chromatograph (GC-14B manufactured by Shimadzu) equipped with an FID type detector. For calibration of the gas chromatograph, 5 ppm acetaldehyde standard gas was used.
  • the CO 2 concentration was measured with an infrared absorption CO 2 meter (41C manufactured by Thermoelectron).
  • FIG. 15 is a graph showing the results of a toluene photocatalytic purification test using g-C 3 N 4 powder obtained by adding HCl and heat-treating at 150 ° C. for 2 hours. The measurement was performed in the same manner as the above-mentioned photocatalytic purification test for acetaldehyde.
  • a gas containing toluene was brought into contact with the photocatalyst without exposure to light, the concentration decreased due to adsorption. The concentration gradually approached the introduced concentration, so when exposed to light, the concentration decreased slightly, and at the same time the generation of CO 2 was confirmed (not shown), indicating that toluene was decomposed.
  • Table 3 shows the results of the toluene removal test.
  • Untreated g-C 3 N 4 powder could not remove (decompose) toluene.
  • the g-C 3 N 4 powder of NaOH treatment, g-C 3 N 4 powder of HCl treatment decomposes the toluene was generate CO 2.
  • the graphite-like carbon nitride powder with improved photocatalytic activity of the present invention can be used as a photocatalytic material by applying it to any substrate, and when this material is used, the energy of light is used to produce air. Can be purified. This material can also be used to decompose acetaldehyde, toluene, and NOx, and can also be used to decompose similar compounds.

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Abstract

L'invention concerne un photocatalyseur sensible à la lumière visible et pouvant être obtenu à un coût inférieur à celui des photocatalyseurs conventionnels par un procédé sans danger. L'invention concerne également un procédé de fabrication du photocatalyseur. Le photocatalyseur sensible à la lumière visible est caractérisé par le fait qu'il contient, comme ingrédient actif, une poudre que l'on obtient en soumettant une poudre de nitrure de carbone de type graphite à un traitement alcalin ou à un traitement acide. Le traitement alcalin ou le traitement acide est, de préférence, un traitement thermique qui est réalisé dans une solution aqueuse alcaline ou une solution aqueuse acide. Un photocatalyseur sensible à la lumière visible obtenu par le procédé a une surface spécifique de pas moins de 20 m2/g et une photo-activité améliorée de façon significative.
PCT/JP2010/068385 2009-10-20 2010-10-19 Photocatalyseur contenant du nitrure de carbone, son procédé de fabrication et procédé de purification d'air à l'aide du photocatalyseur Ceased WO2011049085A1 (fr)

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Cited By (28)

* Cited by examiner, † Cited by third party
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CN114907042A (zh) * 2022-05-26 2022-08-16 福建工程学院 一种光催化钢渣浮露混凝土及其制备方法
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CN115228138A (zh) * 2022-07-21 2022-10-25 上海市农业科学院 一种低成本替代传统活性炭柱的二噁英净化专用柱及其应用
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JP2017100923A (ja) * 2015-12-03 2017-06-08 国立研究開発法人産業技術総合研究所 脱臭用金属複合化窒化炭素とその製造方法
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WO2020127559A1 (fr) * 2018-12-19 2020-06-25 Heidelbergcement Ag Composition de ciment à activité photocatalytique
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JP2020152609A (ja) * 2019-03-20 2020-09-24 株式会社日本触媒 グラファイト状窒化炭素の製造方法ならびに新規なグラファイト状窒化炭素
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