CN111905770B - 一种SrTiO3/SrSO4/Pt双异质结纳米材料的制备方法 - Google Patents
一种SrTiO3/SrSO4/Pt双异质结纳米材料的制备方法 Download PDFInfo
- Publication number
- CN111905770B CN111905770B CN202010776810.1A CN202010776810A CN111905770B CN 111905770 B CN111905770 B CN 111905770B CN 202010776810 A CN202010776810 A CN 202010776810A CN 111905770 B CN111905770 B CN 111905770B
- Authority
- CN
- China
- Prior art keywords
- srso
- srtio
- double
- nano material
- heterojunction nano
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002086 nanomaterial Substances 0.000 title claims abstract description 41
- 229910002370 SrTiO3 Inorganic materials 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims description 23
- 229910052923 celestite Inorganic materials 0.000 claims abstract description 51
- DHEQXMRUPNDRPG-UHFFFAOYSA-N strontium nitrate Chemical compound [Sr+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O DHEQXMRUPNDRPG-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910002367 SrTiO Inorganic materials 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000008367 deionised water Substances 0.000 claims abstract description 19
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 19
- 238000001035 drying Methods 0.000 claims abstract description 16
- 238000002360 preparation method Methods 0.000 claims abstract description 16
- 239000002243 precursor Substances 0.000 claims abstract description 15
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002244 precipitate Substances 0.000 claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 12
- XUJNEKJLAYXESH-UHFFFAOYSA-N cysteine Natural products SCC(N)C(O)=O XUJNEKJLAYXESH-UHFFFAOYSA-N 0.000 claims abstract description 10
- 235000018417 cysteine Nutrition 0.000 claims abstract description 10
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 claims abstract description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229960000583 acetic acid Drugs 0.000 claims abstract description 7
- 239000012362 glacial acetic acid Substances 0.000 claims abstract description 7
- 239000002131 composite material Substances 0.000 claims abstract description 6
- 238000000137 annealing Methods 0.000 claims abstract description 5
- 238000000227 grinding Methods 0.000 claims abstract description 5
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 5
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 4
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 4
- 239000010936 titanium Substances 0.000 claims abstract description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000011593 sulfur Substances 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims description 32
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 8
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- 238000002256 photodeposition Methods 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 229910052593 corundum Inorganic materials 0.000 claims description 4
- 239000010431 corundum Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000005286 illumination Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 229910001961 silver nitrate Inorganic materials 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 229910052724 xenon Inorganic materials 0.000 claims description 4
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 4
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims description 2
- 238000001291 vacuum drying Methods 0.000 claims description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 abstract description 50
- UBXAKNTVXQMEAG-UHFFFAOYSA-L strontium sulfate Chemical compound [Sr+2].[O-]S([O-])(=O)=O UBXAKNTVXQMEAG-UHFFFAOYSA-L 0.000 abstract description 20
- 230000001699 photocatalysis Effects 0.000 abstract description 13
- 229910052697 platinum Inorganic materials 0.000 abstract description 9
- VEALVRVVWBQVSL-UHFFFAOYSA-N strontium titanate Chemical compound [Sr+2].[O-][Ti]([O-])=O VEALVRVVWBQVSL-UHFFFAOYSA-N 0.000 abstract description 8
- 238000013032 photocatalytic reaction Methods 0.000 abstract description 4
- 239000002738 chelating agent Substances 0.000 abstract description 3
- 238000000151 deposition Methods 0.000 abstract description 3
- 238000007146 photocatalysis Methods 0.000 abstract description 3
- 238000003980 solgel method Methods 0.000 abstract description 3
- 238000011161 development Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 239000000047 product Substances 0.000 abstract description 2
- 239000002904 solvent Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 5
- 239000011941 photocatalyst Substances 0.000 description 4
- 230000006798 recombination Effects 0.000 description 4
- 238000005215 recombination Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 238000002173 high-resolution transmission electron microscopy Methods 0.000 description 3
- 239000002105 nanoparticle Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 150000001450 anions Chemical class 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 238000007540 photo-reduction reaction Methods 0.000 description 2
- 238000006303 photolysis reaction Methods 0.000 description 2
- 230000015843 photosynthesis, light reaction Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 150000002843 nonmetals Chemical class 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 229910001427 strontium ion Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000004627 transmission electron microscopy Methods 0.000 description 1
Images
Classifications
-
- 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
- B01J37/02—Impregnation, coating or precipitation
- B01J37/03—Precipitation; Co-precipitation
- B01J37/036—Precipitation; Co-precipitation to form a gel or a cogel
-
- 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
- B01J27/053—Sulfates
-
- B01J35/39—
-
- B01J35/393—
-
- B01J35/396—
-
- B01J35/60—
-
- 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
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
- B01J37/0018—Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)
-
- 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
- B01J37/16—Reducing
-
- 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
- B01J37/34—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation
- B01J37/341—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation
- B01J37/344—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation of electromagnetic wave energy
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
- C01B3/04—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by decomposition of inorganic compounds, e.g. ammonia
- C01B3/042—Decomposition of water
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
Abstract
本发明公开了一种SrTiO3/SrSO4/Pt的双异质结纳米材料的制备方法,具体步骤如下:利用去离子水、冰醋酸、无水乙醇作为溶剂。硝酸锶、钛酸四丁酯分别作为锶源和钛源。加入的半胱氨酸不仅作为螯合剂,也用做硫源。先采用溶胶凝胶法制备出前驱体,然后在干燥箱内低温烘干48小时,研磨后在马弗炉中退火得到钛酸锶硫酸锶的复合粉末;最后通过光沉积法,在表面沉积上一层铂作为助催化剂,得到SrTiO3/SrSO4/Pt双异质结纳米材料。本发明的SrTiO3/SrSO4/Pt双异质结纳米材料具有多孔结构,具有较大的比表面积,可为光催化反应提供更多的活性位点;SrTiO3/SrSO4/Pt在光照下对H2的析出具有很高的活性。在光催化领域有很好的发展前景。
Description
技术领域
本发明属于光催化剂领域,具体涉及一种SrTiO3/SrSO4/Pt双异质结纳米材料的制备方法。
背景技术
SrTiO3具有可调节的能带结构和适当的带隙宽度(3.4eV)。可用于光催化水分解和二氧化碳的光还原制取燃料。同时具有成本低廉,环境友好的优点。 SrTiO3是钙钛矿型材料,具有光催化转化可再生能源的巨大潜力。但是SrTiO3在光催化领域的发展受到限制的主要因素是光生电子和空穴容易复合。抑制光生电子和空穴的复合有很多手段,包括离子掺杂金属或非金属和贵金属的沉积。将导带和价带位置不同的两种半导体结合形成异质结,构成内建电场促进光生电子和空穴有效分离,也是解决这种问题的有效方法。但是由于异质结构中存在光生载流子的随机传输,因此单一的贵金属和半导体形成的异质结构难以满足提高光生载流子分离的需求。因此选用能带匹配的半导体金属材料,设计半导体-贵金属-半导体的光催化结构,构建光生电子的定向输运,提高光生电子- 空穴的分离是最终制备出高性能的光催化剂的重要途径。
SrSO4作为一种宽带隙材料,不适合作为光催化材料的主体,目前在光催化方面几乎没有研究。虽然作为宽带隙材料(7.6eV)的SrSO4不受可见光激发,但是SrSO4无色透明,可以从阳光穿过它而不会失去能量。另一方面,SrSO4具有良好的吸附能力,硫酸锶在其解离面(110)和(210)存在大量硫酸根离子和锶离子,对溶液中离子有强吸附作用。这意味着,硫酸锶表面能吸附大量的阳离子和阴离子。这会导致硫酸锶附近的离子或者官能团的局部浓度的提高,极大增加强氧化性自由基的产生几率,可以用作良好的电子消耗部位。这些都将对光催化反应起着一定的促进作用,引起了我们极大的研究兴趣。
发明内容
本发明的目的在于:提供一种SrTiO3/SrSO4/Pt双异质结纳米材料的制备方法,主要解决的技术问题为改善目前钛酸锶材料在光解水制氢技术应用上的光电子-空穴复合率高,以及比表面积小导致的活性位点低、光解水制氢效率不高的问题。
为了实现上述目的,本发明采用的技术方案是:
一种SrTiO3/SrSO4/Pt双异质结纳米材料的制备方法,选用硝酸锶为锶源,钛酸四丁酯为钛源,半胱氨酸为硫源,采用水热法和光沉积法制备出SrTiO3/ SrSO4/Pt双异质结纳米材料。
优选地,一种SrTiO3/SrSO4/Pt双异质结纳米材料的制备方法,具体步骤如下:
(1)在去离子水中加入半胱氨酸;超声分散后在磁力搅拌器上剧烈搅拌4-6 分钟,再加入硝酸锶,然后在磁力搅拌器上剧烈搅拌至液体澄清、无沉淀物得到A溶液;
(2)将冰醋酸溶于无水乙醇并搅拌4-6分钟,然后倒入盛有钛酸四丁酯的烧杯中继续搅拌,得到B溶液;
(3)在B溶液搅拌过程中逐滴加入A溶液,加入过程中会逐渐发现絮状沉淀的产生,并继续剧烈搅拌1.8-2.2小时,配成前驱体溶液;
(4)将前驱体溶液在烘箱中低温持续烘干;
(5)将步骤(4)得到的固体研磨成粉末状后放入刚玉坩埚中,然后升温到500-600℃后,在马弗炉中退火1.8-2.2小时;等冷却到室温后,将得到的粉末在离心管中用稀盐酸洗涤2-3次,再用去离子水洗涤2-3次,最后,将得到的样品在烘箱中干燥,得到SrTiO3/SrSO4的复合纳米材料;
(6)通过光沉积法,用1wt%的Pt修饰步骤(5)中得到的样品的表面;
(7)将步骤(6)配置的溶液倒入反应器中在暗处搅拌预吸附25-35分钟,然后抽真空,抽好真空后打开光源,用氙灯光照还原4.5-5.5小时,得到的溶液离心分离出的沉淀用去离子水清洗2-3次,直至加入硝酸银溶液后无白色絮状物出现;
(8)将步骤(7)得到的样品在真空干燥,得到SrTiO3/SrSO4/Pt双异质结纳米材料。
优选地,步骤(1)和步骤(2)中加入的硝酸锶与钛酸四丁酯的摩尔比为1.5:1-2:1。
优选地,步骤(1)中半胱氨酸和硝酸锶的摩尔比为1:1.5。
优选地,步骤(2)中冰醋酸和无水乙醇体积比为1:20。
优选地,步骤(4)中低温持续烘干的温度为30-60℃,时间为24-48小时。
优选地,步骤(5)中升温速度为5-10℃/min,稀盐酸的浓度为0.1M;烘箱中干燥温度为60℃。
优选地,步骤(6)的具体过程如下:将步骤(5)中得到的样品分散在去离子水中超声分散13-17分钟,随后加入氯铂酸,在磁力搅拌器上搅拌,再加入甲醇,继续搅拌。
优选地,步骤(8)真空干燥的温度为60-80℃,时间为8-12小时。
本发明的有益效果在于:
本发明采用硝酸锶、钛酸四丁酯为原料,半胱氨酸为螯合剂,成本低廉且环境友好。
本发明采用溶胶凝胶法和光沉积法合成,操作比较简单,并且可以在室温下反应,无需高温高压。通过溶胶凝胶法制备出的材料容易形成多孔结构,这种结构将有利于光催化反应。螯合剂的存在可以获得化学组分分布均一的前驱体,极大地减少STO制备过程中杂质的产生,过程可控。
本发明合成的产物拥有多孔结构。不仅增大了比表面积,而且有利于光催化材料与活性物质的充分接触,增加了反应的活性位点。由于SrSO4的存在为电子传输提供了更好的传输通道,电子和空穴的复合效率降低,从而实现最佳的电荷分离和H+离子还原。而且SrSO4具有很好的吸附性,表面能吸附大量的阳离子和阴离子,这会导致SrSO4附近的离子或者官能团的局部浓度的提高。传输到硫酸锶表面上的电子会和这些吸附的离子发生反应,可以用作良好的电子消耗部位。这些都将对光催化反应起着一定的促进作用。
附图说明
图1是实施例1中的SrTiO3/SrSO4/Pt双异质结纳米材料的XRD图;
图2是实施例1的SrTiO3/SrSO4/Pt双异质结纳米材料的低倍下的扫描电镜图片;
图3是实施例1的SrTiO3/SrSO4/Pt双异质结纳米材料高倍下的扫描电镜图片;
图4(a)是实施例2的SrTiO3/SrSO4/Pt双异质结纳米材料的透射电镜图片, 图4(b)是实施例2的SrTiO3/SrSO4/Pt双异质结纳米材料的高分辨透射电镜图片,图4(c)是实施例2的SrTiO3/SrSO4/Pt双异质结纳米材料的元素分布图;
图5是实施例2的SrTiO3/SrSO4/Pt双异质结纳米材料六个小时内的产氢效率的图片。
具体实施方式
为了便于本领域技术人员理解,下面结合附图和实施例对本发明作进一步说明。
实施例1
一种SrTiO3/SrSO4/Pt双异质结纳米材料的制备方法,具体步骤如下:
(1)首先配置A溶液,在5ml去离子水中溶10mmol半胱氨酸在去离子水中超声分散后在磁力搅拌器上剧烈搅拌五分钟,再加入15mmol的硝酸锶,然后在磁力搅拌器上剧烈搅拌至液体澄清无沉淀物,得到A溶液。
(2)然后配置B溶液,将2ml冰醋酸溶于40ml无水乙醇(AR,99.5%)并搅拌五分钟,然后倒入盛有10mmolTBT的烧杯中继续搅拌,得到B溶液。
(3)前驱体溶液的制备:在B溶液搅拌过程中逐滴加入A溶液,加入过程中会逐渐发现絮状沉淀的产生,并继续剧烈搅拌两个小时,配成前驱体溶液。
(4)将步骤(3)配置好的前驱体溶液在烘箱中低温(40℃)持续烘干48 小时,直至烘干为止。
(5)将步骤(4)得到的固体研磨成粉末状后放入刚玉坩埚中,然后以 10℃/min的速度升温到550℃后,在马弗炉中退火两个小时。等冷却到室温后, 将得到的粉末在离心管中用0.1M的稀盐酸洗涤两到三次,再用去离子水洗涤两到三次。最后,将得到的样品在60℃的烘箱中干燥。得到SrTiO3/SrSO4的复合纳米材料。
(5)通过光沉积用1wt%的Pt修饰步骤(4)中得到的样品的表面。首先,将0.2g样品分散在90ml去离子水中超声分散十五分钟,随后加入512.8微升的氯铂酸【H2PtCl6·6H2O(AR,Pt 37.5%)】在磁力搅拌器上搅拌,再加入10ml甲醇,继续搅拌。
(6)将步骤(5)配置的溶液倒入反应器中在暗处搅拌预吸附30分钟,然后抽真空,抽好真空后打开光源,用氙灯光照还原5小时,得到的溶液离心分离出的沉淀用去离子水清洗两至三次,直至加入硝酸银溶液后无白色絮状物出现。
(7)将步骤(6)得到的样品在80度下真空干燥10小时,得到最终产品。所制备的光催化剂称为SrTiO3/SrSO4/Pt双异质结纳米材料。
本实施例制备的SrTiO3/SrSO4/Pt双异质结纳米材料,具有多孔结构,钛酸锶和硫酸锶形成异质结构后,铂纳米颗粒均匀的负载在上面,从而形成一种 SrTiO3/SrSO4/Pt双异质结纳米材料。
本实施例制备的光催化材料xrd图谱如图1所示,为钛酸锶和硫酸锶的复合材料,由于铂的量较少,所以铂的峰位没有明显的显示出来。本实施例制备的光催化材料的光催化效率如图5所示,通过计算可知SrTiO3/SrSO4/Pt的产氢速率为396.82μmol/g/h,相对于相同方法制备出的纯钛酸锶的产氢速率 (24.22μmol/g/h)大概提高了16倍。H2产生速率在6h内随时间线性增加,表明它们的光催化性能稳定。并且SrTiO3/SrSO4/Pt的光催化制氢效率在六小时内并无衰减的迹象。
实施例2
一种SrTiO3/SrSO4/Pt双异质结纳米材料的制备方法,具体步骤如下:
(1)首先配置A溶液,在5ml去离子水中溶10mmol半胱氨酸在去离子水中超声分散后在磁力搅拌器上剧烈搅拌五分钟,再加入20mmol的硝酸锶,然后在磁力搅拌器上剧烈搅拌至液体澄清无沉淀物。
(2)然后配置B溶液,将2ml冰醋酸溶于40ml无水乙醇(AR,99.5%)并搅拌五分钟,然后倒入盛有10mmolTBT的烧杯中继续搅拌。得到B溶液。
(3)前驱体的制备:在B溶液搅拌过程中逐滴加入步骤(1)制备的A溶液,加入过程中会逐渐发现絮状沉淀的产生,并继续剧烈搅拌两个小时,配成前驱体溶液。
(4)将步骤(3)配置好的前驱体溶液在烘箱中低温(40℃)持续烘干48 小时,直至烘干为止。
(5)将步骤(4)得到的固体研磨成粉末状后放入刚玉坩埚中,然后以 5℃/min的速度升温到550℃后,在马弗炉中退火两个小时。等冷却到室温后, 将得到的粉末在离心管中用0.1M的稀盐酸洗涤两到三次,再用去离子水洗涤两到三次。最后,将得到的样品在60℃的烘箱中干燥。得到SrTiO3/SrSO4的复合纳米材料。
(5)通过光沉积用1wt%的Pt修饰步骤(4)中得到的样品的表面。首先,将0.2g样品分散在90ml去离子水中超声分散十五分钟,随后加入512.8微升的氯铂酸【H2PtCl6·6H2O(AR,Pt 37.5%)】在磁力搅拌器上搅拌,再加入10ml甲醇,继续搅拌。
(6)将步骤(5)配置的溶液倒入反应器中在暗处搅拌预吸附30分钟,然后抽真空,抽好真空后打开光源,用氙灯光照还原5小时,得到的溶液离心分离出的沉淀用去离子水清洗两至三次,直至加入硝酸银溶液后无白色絮状物出现。
(7)将步骤(6)得到的样品在80度下真空干燥10小时,得到最终产品。所制备的光催化剂称为SrTiO3/SrSO4/Pt双异质结纳米材料。
本实施例制备的SrTiO3/SrSO4/Pt双异质结纳米材料,具有多孔结构,如图2、3所示。如图4(a)所示,钛酸锶和硫酸锶形成异质结构后,铂纳米颗粒均匀的负载在上面,从而形成一种SrTiO3/SrSO4/Pt双异质结纳米材料。由图4 (b)可以看出,在相同区域下,放大倍数较大时,红色圆圈标记的黑点显示Pt 纳米颗粒大小为2nm左右而且均匀分布,这证实了Pt通过光还原法成功沉积 SrTiO3/SrSO4的表面上。图4(b)中显示的高分辨率TEM(HRTEM)图像显示了三种类型的晶格条纹,可以看出SrTiO3/SrSO4/Pt双异质结构中的三种组分的晶格花纹都相对明显,晶格间隙为0.195nm对应钛酸锶的(200)晶面;晶格间隙为0.266nm对应于硫酸锶的(020)晶面,晶格间隙为0.194nm对应于铂颗粒的(200)晶面。可以看出钛酸锶硫酸锶的交界处有一条明显的晶界。它显示SrTiO3(200)平面与SrSO4(020)平面在结构上匹配的晶格的存在。此外,图中还给出了SrTiO3/SrSO4/Pt双异质结构纳米材料的EDS-Mapping图,由图可以看出S,Sr,O,Ti和Pt均匀分布。
以上所述的本发明实施方式,并不构成对本发明保护范围的限定。任何在本发明的精神和原则之内所作的修改、等同替换和改进等,均应包含在本发明的权利要求保护范围之内。
Claims (8)
1.一种SrTiO3/SrSO4/Pt双异质结纳米材料的制备方法,其特征在于:选用硝酸锶为锶源,钛酸四丁酯为钛源,半胱氨酸为硫源,采用水热法和光沉积法制备出SrTiO3/SrSO4/Pt双异质结纳米材料,
所述方法具体步骤如下:
(1)在去离子水中加入半胱氨酸;超声分散后在磁力搅拌器上剧烈搅拌4-6分钟,再加入硝酸锶,然后在磁力搅拌器上剧烈搅拌至液体澄清、无沉淀物得到A溶液;
(2)将冰醋酸溶于无水乙醇并搅拌4-6分钟,然后倒入盛有钛酸四丁酯的烧杯中继续搅拌,得到B溶液;
(3)在B溶液搅拌过程中逐滴加入A溶液,加入过程中会逐渐发现絮状沉淀的产生,并继续剧烈搅拌1.8-2.2小时,配成前驱体溶液;
(4)将前驱体溶液在烘箱中低温持续烘干;
(5)将步骤(4)得到的固体研磨成粉末状后放入刚玉坩埚中,然后升温到500-600℃后,在马弗炉中退火1.8-2.2小时;等冷却到室温后,将得到的粉末在离心管中用稀盐酸洗涤2-3次,再用去离子水洗涤2-3次,最后,将得到的样品在烘箱中干燥,得到SrTiO3/SrSO4的复合纳米材料;
(6)通过光沉积法,用1wt%的Pt修饰步骤(5)中得到的样品的表面;
(7)将步骤(6)配置的溶液倒入反应器中在暗处搅拌预吸附25-35分钟,然后抽真空,抽好真空后打开光源,用氙灯光照还原4.5-5.5小时,得到的溶液离心分离出的沉淀用去离子水清洗2-3次,直至加入硝酸银溶液后无白色絮状物出现;
(8)将步骤(7)得到的样品在真空干燥,得到SrTiO3/SrSO4/Pt双异质结纳米材料。
2.根据权利要求1所述的SrTiO3/SrSO4/Pt双异质结纳米材料的制备方法,其特征在于,步骤(1)和步骤(2)中加入的硝酸锶与钛酸四丁酯的摩尔比为1.5:1-2:1。
3.根据权利要求1所述的SrTiO3/SrSO4/Pt双异质结纳米材料的制备方法,其特征在于:步骤(1)中半胱氨酸和硝酸锶的摩尔比为1:1.5。
4.根据权利要求1所述的SrTiO3/SrSO4/Pt双异质结纳米材料的制备方法,其特征在于:步骤(2)中冰醋酸和无水乙醇体积比为1:20。
5.根据权利要求1所述的SrTiO3/SrSO4/Pt双异质结纳米材料的制备方法,其特征在于:步骤(4)中低温持续烘干的温度为30-60℃,时间为24-48小时。
6.根据权利要求1所述的SrTiO3/SrSO4/Pt双异质结纳米材料的制备方法,其特征在于:步骤(5)中升温速度为5-10℃/min,稀盐酸的浓度为0.1M;烘箱中干燥温度为60℃。
7.根据权利要求1所述的SrTiO3/SrSO4/Pt双异质结纳米材料的制备方法,其特征在于:步骤(6)的具体过程如下:将步骤(5)中得到的样品分散在去离子水中超声分散13-17分钟,随后加入氯铂酸,在磁力搅拌器上搅拌,再加入甲醇,继续搅拌。
8.根据权利要求1所述的SrTiO3/SrSO4/Pt双异质结纳米材料的制备方法,其特征在于:步骤(8)真空干燥的温度为60-80℃,时间为8-12小时。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202010776810.1A CN111905770B (zh) | 2020-08-05 | 2020-08-05 | 一种SrTiO3/SrSO4/Pt双异质结纳米材料的制备方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202010776810.1A CN111905770B (zh) | 2020-08-05 | 2020-08-05 | 一种SrTiO3/SrSO4/Pt双异质结纳米材料的制备方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN111905770A CN111905770A (zh) | 2020-11-10 |
CN111905770B true CN111905770B (zh) | 2022-04-19 |
Family
ID=73287554
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202010776810.1A Active CN111905770B (zh) | 2020-08-05 | 2020-08-05 | 一种SrTiO3/SrSO4/Pt双异质结纳米材料的制备方法 |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN111905770B (zh) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114632505A (zh) * | 2022-02-17 | 2022-06-17 | 正威(东阳)新材料科技有限公司 | M0/SrTi1-xMYO3-δ及其制备方法和应用 |
CN114261994B (zh) * | 2022-03-02 | 2022-05-20 | 青岛理工大学 | 一种光阳极材料、溶胶-凝胶燃烧制备方法和应用 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101038857A (zh) * | 2006-03-03 | 2007-09-19 | 株式会社半导体能源研究所 | 制造半导体装置的方法 |
CN102822098A (zh) * | 2010-04-12 | 2012-12-12 | 日东电工株式会社 | 粒子、粒子分散液、粒子分散树脂组合物、其制造方法、树脂成形体、其制造方法、催化剂粒子、催化剂液、催化剂组合物、催化剂成形体、钛络合物、氧化钛粒子及其制造方法 |
CN104185802A (zh) * | 2012-01-25 | 2014-12-03 | 柯尼卡美能达株式会社 | 光学膜 |
CN107051549A (zh) * | 2017-03-21 | 2017-08-18 | 重庆大学 | 双异质结构光催化剂及其应用和制备方法 |
CN109663586A (zh) * | 2019-01-25 | 2019-04-23 | 重庆工商大学 | 多孔薄壁二氧化钛/硫酸锶异质结空心纳米立方体及其制备方法 |
CN109967098A (zh) * | 2017-12-28 | 2019-07-05 | Tcl集团股份有限公司 | 一种光催化剂及其制备方法与应用 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8114367B2 (en) * | 2007-11-15 | 2012-02-14 | Rutgers, The State University Of New Jersey | Systems and methods for carbon capture and sequestration and compositions derived therefrom |
CN105854868A (zh) * | 2016-03-30 | 2016-08-17 | 盐城工学院 | 一种溶胶-凝胶法制备钼掺杂二氧化钛薄膜的方法 |
US10894757B2 (en) * | 2018-03-09 | 2021-01-19 | King Abdulaziz University | Pt/SrTiO3 photocatalyst for production of cycloalkanols and cycloalkanones from cycloalkanes |
CN109589997A (zh) * | 2018-12-20 | 2019-04-09 | 常州大学 | 一种MoSe2/SrTiO3高效复合光催化剂的制备方法 |
-
2020
- 2020-08-05 CN CN202010776810.1A patent/CN111905770B/zh active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101038857A (zh) * | 2006-03-03 | 2007-09-19 | 株式会社半导体能源研究所 | 制造半导体装置的方法 |
CN102822098A (zh) * | 2010-04-12 | 2012-12-12 | 日东电工株式会社 | 粒子、粒子分散液、粒子分散树脂组合物、其制造方法、树脂成形体、其制造方法、催化剂粒子、催化剂液、催化剂组合物、催化剂成形体、钛络合物、氧化钛粒子及其制造方法 |
CN104185802A (zh) * | 2012-01-25 | 2014-12-03 | 柯尼卡美能达株式会社 | 光学膜 |
CN107051549A (zh) * | 2017-03-21 | 2017-08-18 | 重庆大学 | 双异质结构光催化剂及其应用和制备方法 |
CN109967098A (zh) * | 2017-12-28 | 2019-07-05 | Tcl集团股份有限公司 | 一种光催化剂及其制备方法与应用 |
CN109663586A (zh) * | 2019-01-25 | 2019-04-23 | 重庆工商大学 | 多孔薄壁二氧化钛/硫酸锶异质结空心纳米立方体及其制备方法 |
Also Published As
Publication number | Publication date |
---|---|
CN111905770A (zh) | 2020-11-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
Zhang et al. | Fabrication of Ag decorated g-C3N4/LaFeO3 Z-scheme heterojunction as highly efficient visible-light photocatalyst for degradation of methylene blue and tetracycline hydrochloride | |
Wang et al. | Black TiO2 for solar hydrogen conversion | |
Bi et al. | Research progress on photocatalytic reduction of CO 2 based on LDH materials | |
Zhang et al. | Enhanced photocatalytic reduction of CO2 to methanol by ZnO nanoparticles deposited on ZnSe nanosheet | |
Guo et al. | Photocatalytic Reduction of CO2 over Heterostructure Semiconductors into Value‐Added Chemicals | |
Yu et al. | Improved H2-generation performance of Pt/CdS photocatalyst by a dual-function TiO2 mediator for effective electron transfer and hole blocking | |
CN110152711B (zh) | 一种CeO2@MoS2/g-C3N4三元复合光催化剂及其制备方法 | |
Wang et al. | Photocatalytic CO2 reduction with water vapor to CO and CH4 in a recirculation reactor by Ag-Cu2O/TiO2 Z-scheme heterostructures | |
Kadi et al. | Uniform dispersion of CuO nanoparticles on mesoporous TiO2 networks promotes visible light photocatalysis | |
CN108671907B (zh) | 一种铂/二氧化钛纳米花复合材料及其制备方法与应用 | |
Li et al. | ZnO/CdSe-diethylenetriamine nanocomposite as a step-scheme photocatalyst for photocatalytic hydrogen evolution | |
CN111905770B (zh) | 一种SrTiO3/SrSO4/Pt双异质结纳米材料的制备方法 | |
Zhang et al. | Fabrication and characterization of high efficient Z-scheme photocatalyst Bi2MoO6/reduced graphene oxide/BiOBr for the degradation of organic dye and antibiotic under visible-light irradiation | |
Mao et al. | Hydrogen evolution from photocatalytic water splitting by LaMnO 3 modified with amorphous CoS x | |
An et al. | ZnS–CdS–TaON nanocomposites with enhanced stability and photocatalytic hydrogen evolution activity | |
Zhao et al. | RGO Boosts Band Gap Regulates for Constructing Ni 2 P/RGO/MoO 2 Z-Scheme Heterojunction to Achieve High Efficiency Photocatalytic H 2 Evolution | |
Luo et al. | Ultrathin ZIS nanosheets encapsulated in metal–organic-framework-derived CNCo-Fe 3 O 4 as an efficient functional photocatalyst for hydrogen evolution | |
CN114522709B (zh) | 一种三维多孔石墨相氮化碳/碘氧化铋/银纳米粒子复合光催化剂及其制备方法和应用 | |
Lu et al. | Microwave-assisted synthesis and characterization of BiOI/BiF 3 p–n heterojunctions and its enhanced photocatalytic properties | |
CN108579738B (zh) | 一种金纳米颗粒/二氧化钛纳米花复合材料及其制备方法与应用 | |
Yang et al. | Construction of shell-core Co2P/Cd0. 9Zn0. 1S photocatalyst by electrostatic attraction for enhancing H2 evolution | |
Wang et al. | S-scheme Cu3P/TiO2 heterojunction for outstanding photocatalytic water splitting | |
CN110064386B (zh) | 一种锡纳米颗粒修饰的具氧空位四氧化三锡纳米片复合光催化材料及制备方法 | |
CN111841597A (zh) | 一种钴负载氮杂氧化石墨烯/介孔薄层氮化碳的复合光催化材料及其制备方法 | |
Song et al. | Metal doping promotes the efficient electrochemical reduction of CO2 to CO in CuO nanosheets |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
GR01 | Patent grant | ||
GR01 | Patent grant |