CN105727997A - Cadmium sulfide/sodium titanate supported type compound visible-light-driven photocatalyst and preparation method and application thereof - Google Patents
Cadmium sulfide/sodium titanate supported type compound visible-light-driven photocatalyst and preparation method and application thereof Download PDFInfo
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- WUPHOULIZUERAE-UHFFFAOYSA-N 3-(oxolan-2-yl)propanoic acid Chemical compound OC(=O)CCC1CCCO1 WUPHOULIZUERAE-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 229910052980 cadmium sulfide Inorganic materials 0.000 title claims abstract description 56
- GROMGGTZECPEKN-UHFFFAOYSA-N sodium metatitanate Chemical compound [Na+].[Na+].[O-][Ti](=O)O[Ti](=O)O[Ti]([O-])=O GROMGGTZECPEKN-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000011941 photocatalyst Substances 0.000 title abstract description 6
- 150000001875 compounds Chemical class 0.000 title abstract 4
- 239000003054 catalyst Substances 0.000 claims abstract description 48
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 230000003647 oxidation Effects 0.000 claims abstract description 11
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 11
- 239000010936 titanium Substances 0.000 claims abstract description 11
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 11
- 239000003513 alkali Substances 0.000 claims abstract description 7
- 150000001661 cadmium Chemical class 0.000 claims abstract description 7
- 229910052793 cadmium Inorganic materials 0.000 claims abstract description 7
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 230000003197 catalytic effect Effects 0.000 claims abstract description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 5
- 239000002131 composite material Substances 0.000 claims description 37
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 7
- 239000004408 titanium dioxide Substances 0.000 claims description 7
- 239000011259 mixed solution Substances 0.000 claims description 6
- 230000002195 synergetic effect Effects 0.000 claims description 6
- 239000002585 base Substances 0.000 claims description 5
- XIEPJMXMMWZAAV-UHFFFAOYSA-N cadmium nitrate Inorganic materials [Cd+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XIEPJMXMMWZAAV-UHFFFAOYSA-N 0.000 claims description 5
- 239000002105 nanoparticle Substances 0.000 claims description 5
- NMHMNPHRMNGLLB-UHFFFAOYSA-N phloretic acid Chemical compound OC(=O)CCC1=CC=C(O)C=C1 NMHMNPHRMNGLLB-UHFFFAOYSA-N 0.000 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 239000011593 sulfur Substances 0.000 claims description 4
- FPCJKVGGYOAWIZ-UHFFFAOYSA-N butan-1-ol;titanium Chemical compound [Ti].CCCCO.CCCCO.CCCCO.CCCCO FPCJKVGGYOAWIZ-UHFFFAOYSA-N 0.000 claims description 3
- QCUOBSQYDGUHHT-UHFFFAOYSA-L cadmium sulfate Chemical compound [Cd+2].[O-]S([O-])(=O)=O QCUOBSQYDGUHHT-UHFFFAOYSA-L 0.000 claims description 3
- 229910000331 cadmium sulfate Inorganic materials 0.000 claims description 3
- 239000008246 gaseous mixture Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 229910052736 halogen Inorganic materials 0.000 claims description 3
- 150000002367 halogens Chemical class 0.000 claims description 3
- 238000005304 joining Methods 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 229910000349 titanium oxysulfate Inorganic materials 0.000 claims description 3
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 claims description 3
- VXUYXOFXAQZZMF-UHFFFAOYSA-N titanium(IV) isopropoxide Chemical compound CC(C)O[Ti](OC(C)C)(OC(C)C)OC(C)C VXUYXOFXAQZZMF-UHFFFAOYSA-N 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- 238000001291 vacuum drying Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 2
- 230000001699 photocatalysis Effects 0.000 abstract description 14
- 238000007146 photocatalysis Methods 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 5
- 238000001179 sorption measurement Methods 0.000 abstract description 4
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 abstract description 2
- 239000005864 Sulphur Substances 0.000 abstract 1
- 230000003115 biocidal effect Effects 0.000 abstract 1
- 238000013329 compounding Methods 0.000 abstract 1
- 238000004146 energy storage Methods 0.000 abstract 1
- 239000003344 environmental pollutant Substances 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- 231100000719 pollutant Toxicity 0.000 abstract 1
- 239000002904 solvent Substances 0.000 abstract 1
- 150000003609 titanium compounds Chemical class 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000010718 Oxidation Activity Effects 0.000 description 3
- 238000006555 catalytic reaction Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 235000019391 nitrogen oxide Nutrition 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 229960003753 nitric oxide Drugs 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical group [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012916 structural analysis Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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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
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/02—Sulfur, selenium or tellurium; Compounds thereof
- B01J27/04—Sulfides
-
- 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
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
-
- 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
- B01D2255/00—Catalysts
- B01D2255/65—Catalysts not containing noble metals
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Catalysts (AREA)
Abstract
The invention discloses a cadmium sulfide/sodium titanate supported type compound visible-light-driven photocatalyst, a preparation method thereof and application of the cadmium sulfide/sodium titanate supported type compound visible-light-driven photocatalyst in NO removal achieved through alkali adsorption and photocatalytic oxidation synergism.The cadmium sulfide/sodium titanate supported type compound visible-light-driven photocatalyst is synthesized through a one-step hydrothermal synthesis method with water as solvent, cadmium salt as a cadmium source, thiourea as a sulphur source and titanium compounds as a titanium source under the strong alkaline condition.In the reaction system where NO is oxidized through flowing gas phase photocatalytic oxidation, the catalyst can remove NO gas by 81%, and the good visible light photocatalytic activity is displayed.The catalyst is simple in preparation method, and environment pollution can not be generated in the preparation process.By compounding cadmium sulfide nanometer particles having visible light photocatalytic activity and sodium titanate nanometer pieces having strong alkaline positions, the catalytic performance and stability of the material are greatly improved.The material has potential application in the fields such as energy storage, pollution gas adsorption, antibiosis, pollutant photocatalysis processing and new energy development.
Description
Technical field
The present invention relates to photocatalyst technology field, be specifically related to the preparation of a kind of cadmium sulfide/sodium titanate support type composite visible light catalyst and the application of alkali absorbing synergic photochemical catalytic oxidation removal NO thereof.
Background technology
One of important environmental factors that pure air is the mankind and all living things is depended on for existence.But, the mankind are producing and in life activity, year in year out to all kinds of exhaust emission material of airborne release, are making earth environment suffer severe contamination and destruction, make area and city atmospheric environment quality constantly decline.The current whole world enters the harmful gas of air every year more than 600,000,000 tons, and its distribution is wide, harm is big, administer difficulty.It is one of PM2.5 key reason formed that NOx in current atmospheric pollution pollutes, and directly affects the basic conditions of existence of the mankind.
Photocatalysis is to absorb luminous energy by semi-conducting material to excite electronics to produce hole, and hole has very strong electronic capability, can capture the electronics in NO system so that it is activation and be finally oxidised to nitrate anionIon.Photocatalysis has reaction condition gentleness, energy consumption is low, secondary pollution is few, do not need the advantages such as other additive.But owing to nitrogen oxides is relatively stable, cause photocatalysis to remove transformation efficiency low, the absorption property difference of NO is caused its activation difficulty, and the consideration that catalyst light induced electron is separated with hole is inadequate, it addition, in NO oxidizing process, existAdsorb at catalyst surface and cover the avtive spot of catalyst and reduce the problems such as catalytic efficiency.
Cadmium sulfide is a kind of typical II-VI quasiconductor, and Bohr radius is 2.4nm, and energy gap is 2.42eV.Cadmium sulfide nano material is along with the reduction of nano-scale and morphology change, and obvious change will occur its energy gap, shows the photocatalysis performance more more excellent than bulk material；But owing to cadmium sulfide is unstable, easily there is photoetch reaction, affect its catalytic reaction activity and stability, limit its application in photocatalysis.The laminated structure of sodium titanate is conducive to electric charge to shift, and reduces the recombination probability in light induced electron and hole, it is possible to improve the activity of catalyst in light-catalyzed reaction；Sodium titanate as solid base catalyst and carrier, due to the basic activated center in sodium titanate, can be more beneficial for being adsorbed on after neutralizing NO oxidation the acidic species of catalyst surface, it is possible to improve the stability of catalyst in light-catalyzed reaction in application.Sodium titanate nanometer sheet is utilized to solve, as carrier, the difficult problem that cadmium sulfide is unstable, all significant for air cleaning and the PM2.5 reduced in air.
The present invention passes through hydrothermal synthesis method, and a step prepares cadmium sulfide/sodium titanate support type composite under strongly alkaline conditions, is a kind of good visible-light-responsive photocatalyst.
Summary of the invention
Present invention aims to the defect existing for prior art and the market demand, it is provided that a kind of cadmium sulfide/sodium titanate support type composite visible light catalyst and preparation method and application simple, with low cost thereof.
The preparation method of cadmium sulfide of the present invention/sodium titanate support type composite visible light catalyst, it is characterised in that comprise the following steps: cadmium salt and sulfur source are joined in strong base solution, stir, joining in above-mentioned mixed solution by titanium source again, ultrasonic disperse is uniform, is placed in hydrothermal reaction kettle by mixed solution, reaction temperature is 140-180 DEG C, response time is 48h, and after being cooled to room temperature, washing is to neutral, centrifugal also vacuum drying, obtains cadmium sulfide/sodium titanate support type composite visible light catalyst.
Cadmium sulfide/sodium titanate support type composite visible light catalyst that said method prepares, it is characterised in that cadmium sulfide nanoparticles uniform load is in sodium titanate nanometer sheet.
In the preparation method of above-mentioned cadmium sulfide/sodium titanate support type composite visible light catalyst, the amount of substance in cadmium salt and sulfur source is than for 1:3.
In the preparation method of above-mentioned cadmium sulfide/sodium titanate support type composite visible light catalyst, the mass ratio of the cadmium in cadmium salt and the titanium in titanium source is 3:1～3:8, and wherein best proportion is 3:2.
In the preparation method of above-mentioned cadmium sulfide/sodium titanate support type composite visible light catalyst, strong base solution used is 10mol/L sodium hydroxide solution.
In the preparation method of above-mentioned cadmium sulfide/sodium titanate support type composite visible light catalyst, described cadmium source includes cadmium nitrate, Caddy (Cleary) and cadmium sulfate, it is preferred to cadmium nitrate.
In the preparation method of above-mentioned cadmium sulfide/sodium titanate support type composite visible light catalyst, described titanium source includes titanyl sulfate, butyl titanate, isopropyl titanate, titanium tetrachloride and titanium dioxide, it is preferred to titanium dioxide.
Above-mentioned cadmium sulfide/sodium titanate support type composite visible light catalyst cadmium sulfide/sodium titanate support type composite visible light catalyst is applied to alkali absorbing synergic photochemical catalytic oxidation and removes NO, specifically comprises the following steps that
The cadmium sulfide of a certain amount of (0.05-0.2g)/sodium titanate support type composite visible light catalyst powder is tiled in the reactor, pass into the NO of finite concentration (200-1000ppb) and the gaseous mixture of high pure air, mobile phase gas flow rate is 2000-8000sccm, and light source utilizes the halogen tungsten lamp of 2*150W plus glass filter plate (JB-420) simulated visible light light source.
Product prepared by the present invention carries out structural characterization by the following means: adopt the X-ray diffraction measured on Rigaku RigakuD/Max-RB type X-ray diffractometer to carry out the structural analysis of sample；Adopt that U.S.'s match is silent to fly the calibration of Thermo146i type dynamic gas regulator and pass into NO gas concentration, Thermo42i type nitrogen-oxide analyzer, on-line analysis NO concentration change；Adopt the stereoscan photograph that Japan's HitachiS-4800 type scanning electron Electronic Speculum obtains；Adopt the transmission electron microscope photo that Japan's JEOLJEM-2100 type transmission electron microscope obtains.
The present invention compared with prior art, has the following advantages and prominent effect: chemical reagent used in the present invention is common agents, cheap and easy to get.Compared with being presently required the alcohol full-boiled process controlling titanium oxide structure with various alcohols and surfactant, preparation technology is simple, easy to operate, and the pollution of generation is few, and the catalyst stability of synthesis is good, and activity is high, and cycle efficieny is good.Cadmium sulfide prepared by the present invention/sodium titanate support type composite visible light catalyst under visible light, for the reaction of the volatile corrosion inhibitor film NO that flows, can be removed the NO gas up to 81%, be much higher than traditional visible light catalyst.
Accompanying drawing explanation
Fig. 1 is the XRD figure spectrum of the cadmium sulfide obtained by embodiment 1/sodium titanate support type composite visible light catalyst, the peak one_to_one corresponding of each diffraction maximum and cadmium sulfide and sodium titanate in figure, it was shown that there is cadmium sulfide and sodium titanate two component in sample.
Fig. 2 is the oxidation removal rate reaction process figure that the cadmium sulfide obtained by embodiment 1/sodium titanate support type composite visible light catalyst is applied to alkali absorbing synergic photocatalysis NO, demonstrating gained sample in figure has good visible light photocatalysis active, NO clearance to be 81% for oxidation mobile phase NO.
Fig. 3 is transmission electron microscope picture and the SEAD figure of the cadmium sulfide obtained by embodiment 1/sodium titanate support type composite visible light catalyst sample.Picture proves that cadmium sulfide nanoparticles is dispersed in sodium titanate nanometer sheet.
Fig. 4 is the nitrogen Adsorption and desorption isotherms of the cadmium sulfide obtained by embodiment 1/sodium titanate support type composite visible light catalyst sample.
Detailed description of the invention
Being making further detailed, clear and complete description of how realizing to the present invention below in conjunction with specific embodiment, the present invention is only further described by listed embodiment, not thereby limiting the invention:
Embodiment 1
3.830g cadmium nitrate and 3.699g thiourea are joined in the 10mol/L sodium hydroxide solution of 60ml, stir, joining in above-mentioned mixed solution by 0.2890g titanium dioxide again, ultrasonic disperse is uniform, is placed in hydrothermal reaction kettle by mixed solution, reaction temperature is 160 DEG C, response time is 48h, and after being cooled to room temperature, washing is to neutral, centrifugal also vacuum drying, obtains cadmium sulfide/sodium titanate support type composite visible light catalyst.
Fig. 1 is the XRD figure spectrum of the cadmium sulfide obtained by embodiment 1/sodium titanate support type composite visible light catalyst, the peak one_to_one corresponding of each diffraction maximum and cadmium sulfide and sodium titanate in figure, it was shown that there is cadmium sulfide and sodium titanate two component in sample.
Fig. 2 is the oxidation removal rate reaction process figure that the cadmium sulfide obtained by embodiment 1/sodium titanate support type composite visible light catalyst is applied to alkali absorbing synergic photocatalysis NO, demonstrating gained sample in figure has good visible light photocatalysis active, NO clearance to be 81% for oxidation mobile phase NO.
Fig. 3 is transmission electron microscope picture and the SEAD figure of the cadmium sulfide obtained by embodiment 1/sodium titanate support type composite visible light catalyst sample.Picture proves that cadmium sulfide nanoparticles is dispersed in sodium titanate nanometer sheet.
Fig. 4 is the nitrogen of the cadmium sulfide obtained by embodiment 1/sodium titanate support type composite visible light catalyst sample
Adsorption and desorption isotherms, wherein calculates according to BJH, and the specific surface area of sample is 20.4m2/g。
Embodiment 2,3,4
Difference from Example 1 is only that titanium dioxide amount used is different, embodiment 2,3,4 respectively 0.1445g, 0.5780g, 1.156g, products obtained therefrom thing phase composition is consistent, and microscopic appearance is difference slightly, along with increasing of titanium dioxide, the dispersion of cadmium sulfide nanoparticles is more high, and wherein the dispersibility of 0.2890g gained and activity are best.
Embodiment 5,6,7,8
Difference from Example 1 is only that titanium source used is different, embodiment 5,6,7,8 respectively titanyl sulfate, butyl titanate, isopropyl titanate and titanium tetrachloride, products therefrom is consistent in thing phase composition, and structure is similar, and the sample being wherein titanium source with titanium dioxide has the highest NO oxidation activity.
Embodiment 9,10
Difference from Example 1 is only that cadmium source used is different, embodiment 9,10 respectively Caddy (Cleary), cadmium sulfate, and products therefrom is consistent in thing phase composition, and structure is similar, and the sample being wherein cadmium source with cadmium nitrate has the highest NO oxidation activity.
Embodiment 11,12
Difference from Example 1 is only that hydrothermal temperature is different, embodiment 11,12 respectively 140 DEG C, 180 DEG C, products obtained therefrom thing phase composition is consistent, and cadmium sulfide granular size raises with anti-temperature and increases, and wherein has the highest NO catalytic oxidation activity with 160 DEG C of reaction temperatures.
The sample powder 0.1g weighing embodiment 1 prepared is laid in NO reactor, pass into the gaseous mixture of 550ppbNO and high pure air, mobile phase gas flow rate is 4000sccm, utilize the halogen tungsten lamp of 2*150W plus glass filter plate (JB-420) simulated visible light light source irradiation sample, the NO gas concentration of on-line checking outflow reactor, and utilize equation below to calculate NO clearance.NO clearance (%)=(entering reactor NO concentration-outflow reactor NO concentration)/enter reactor NO concentration * 100%.
Result shows the cadmium sulfide prepared by the present embodiment/sodium titanate support type composite visible light catalyst under visible light, for the reaction of the volatile corrosion inhibitor film NO that flows, can remove the NO gas up to 81%, be much higher than traditional visible light catalyst.
The ultimate principle of the present invention, principal character and advantages of the present invention have more than been shown and described.Skilled person will appreciate that of the industry; the present invention is not restricted to the described embodiments; described in above-described embodiment and description is that principles of the invention is described; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements both fall within the claimed scope of the invention.
Claims (9)
1. cadmium sulfide/sodium titanate support type composite visible light catalyst, it is characterised in that cadmium sulfide nanoparticles uniform load is in sodium titanate nanometer sheet.
2. the preparation method of cadmium sulfide/sodium titanate support type composite visible light catalyst, it is characterised in that comprise the following steps: cadmium salt and sulfur source are joined in strong base solution, stir, joining in above-mentioned mixed solution by titanium source again, ultrasonic disperse is uniform, is placed in hydrothermal reaction kettle by mixed solution, reaction temperature is 140-180 DEG C, response time is 48h, and after being cooled to room temperature, washing is to neutral, centrifugal also vacuum drying, obtains cadmium sulfide/sodium titanate support type composite visible light catalyst.
3. the preparation method of cadmium sulfide described in claim 2/sodium titanate support type composite visible light catalyst, it is characterised in that the amount of substance in cadmium salt and sulfur source is than for 1:3.
4. the preparation method of cadmium sulfide described in claim 2/sodium titanate support type composite visible light catalyst, it is characterised in that the mass ratio of the cadmium in cadmium salt and the titanium in titanium source is 3:1～3:8.
5. the preparation method of cadmium sulfide described in claim 2/sodium titanate support type composite visible light catalyst, it is characterised in that strong base solution used is 10mol/L sodium hydroxide solution.
6. the preparation method of cadmium sulfide described in claim 2/sodium titanate support type composite visible light catalyst, it is characterised in that described titanium source includes titanyl sulfate, butyl titanate, isopropyl titanate, titanium tetrachloride and titanium dioxide.
7. the preparation method of cadmium sulfide described in claim 2/sodium titanate support type composite visible light catalyst, it is characterised in that described cadmium source includes cadmium nitrate, Caddy (Cleary) and cadmium sulfate.
8. cadmium sulfide described in claim 1/sodium titanate support type composite visible light catalyst is applied to alkali absorbing synergic photochemical catalytic oxidation and removes NO.
9. cadmium sulfide described in claim 1/sodium titanate support type composite visible light catalyst is applied to alkali absorbing synergic photochemical catalytic oxidation and removes NO, it is characterized in that, specifically comprise the following steps that and cadmium sulfide/sodium titanate support type composite visible light catalyst is tiled in the reactor, pass into the gaseous mixture of NO and high pure air, mobile phase gas flow rate is 2000-8000sccm, and light source utilizes the halogen tungsten lamp of 2*150W plus glass filter plate (JB-420) simulated visible light light source.
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| CN201610067541.5A CN105727997A (en) | 2016-01-29 | 2016-01-29 | Cadmium sulfide/sodium titanate supported type compound visible-light-driven photocatalyst and preparation method and application thereof |
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