CN112007663B - 一种MoS2@CrOx/La,Al-SrTiO3/CoOOH光催化剂及制备方法 - Google Patents
一种MoS2@CrOx/La,Al-SrTiO3/CoOOH光催化剂及制备方法 Download PDFInfo
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- 229910002370 SrTiO3 Inorganic materials 0.000 title claims abstract description 66
- 229910019923 CrOx Inorganic materials 0.000 title claims abstract description 48
- 229910018916 CoOOH Inorganic materials 0.000 title claims abstract description 39
- 229910052961 molybdenite Inorganic materials 0.000 title claims abstract description 32
- 229910052982 molybdenum disulfide Inorganic materials 0.000 title claims abstract description 32
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 239000011941 photocatalyst Substances 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 29
- 239000002131 composite material Substances 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 17
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 238000002156 mixing Methods 0.000 claims description 16
- 239000002105 nanoparticle Substances 0.000 claims description 15
- 239000002114 nanocomposite Substances 0.000 claims description 13
- 150000001875 compounds Chemical class 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 12
- 229910002367 SrTiO Inorganic materials 0.000 claims description 10
- 238000000498 ball milling Methods 0.000 claims description 10
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- 229910001631 strontium chloride Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 6
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 claims description 5
- 150000001844 chromium Chemical class 0.000 claims description 5
- 239000011261 inert gas Substances 0.000 claims description 5
- FYDKNKUEBJQCCN-UHFFFAOYSA-N lanthanum(3+);trinitrate Chemical compound [La+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FYDKNKUEBJQCCN-UHFFFAOYSA-N 0.000 claims description 5
- 238000000197 pyrolysis Methods 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 5
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 4
- YKYOUMDCQGMQQO-UHFFFAOYSA-L cadmium dichloride Chemical compound Cl[Cd]Cl YKYOUMDCQGMQQO-UHFFFAOYSA-L 0.000 claims description 4
- -1 chromium salt compound Chemical class 0.000 claims description 4
- PHFQLYPOURZARY-UHFFFAOYSA-N chromium trinitrate Chemical compound [Cr+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O PHFQLYPOURZARY-UHFFFAOYSA-N 0.000 claims description 4
- PPQREHKVAOVYBT-UHFFFAOYSA-H dialuminum;tricarbonate Chemical compound [Al+3].[Al+3].[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O PPQREHKVAOVYBT-UHFFFAOYSA-H 0.000 claims description 4
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 229910017569 La2(CO3)3 Inorganic materials 0.000 claims description 2
- HDYRYUINDGQKMC-UHFFFAOYSA-M acetyloxyaluminum;dihydrate Chemical compound O.O.CC(=O)O[Al] HDYRYUINDGQKMC-UHFFFAOYSA-M 0.000 claims description 2
- 229940009827 aluminum acetate Drugs 0.000 claims description 2
- 229940118662 aluminum carbonate Drugs 0.000 claims description 2
- 229940024548 aluminum oxide Drugs 0.000 claims description 2
- LHQLJMJLROMYRN-UHFFFAOYSA-L cadmium acetate Chemical compound [Cd+2].CC([O-])=O.CC([O-])=O LHQLJMJLROMYRN-UHFFFAOYSA-L 0.000 claims description 2
- 229940011182 cobalt acetate Drugs 0.000 claims description 2
- GVPFVAHMJGGAJG-UHFFFAOYSA-L cobalt dichloride Chemical compound [Cl-].[Cl-].[Co+2] GVPFVAHMJGGAJG-UHFFFAOYSA-L 0.000 claims description 2
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 claims description 2
- 229910001981 cobalt nitrate Inorganic materials 0.000 claims description 2
- 229940044175 cobalt sulfate Drugs 0.000 claims description 2
- 229910000361 cobalt sulfate Inorganic materials 0.000 claims description 2
- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical compound [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 claims description 2
- QAHREYKOYSIQPH-UHFFFAOYSA-L cobalt(II) acetate Chemical compound [Co+2].CC([O-])=O.CC([O-])=O QAHREYKOYSIQPH-UHFFFAOYSA-L 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 150000002500 ions Chemical class 0.000 claims description 2
- NZPIUJUFIFZSPW-UHFFFAOYSA-H lanthanum carbonate Chemical compound [La+3].[La+3].[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O NZPIUJUFIFZSPW-UHFFFAOYSA-H 0.000 claims description 2
- 229960001633 lanthanum carbonate Drugs 0.000 claims description 2
- JLRJWBUSTKIQQH-UHFFFAOYSA-K lanthanum(3+);triacetate Chemical compound [La+3].CC([O-])=O.CC([O-])=O.CC([O-])=O JLRJWBUSTKIQQH-UHFFFAOYSA-K 0.000 claims description 2
- ICAKDTKJOYSXGC-UHFFFAOYSA-K lanthanum(iii) chloride Chemical compound Cl[La](Cl)Cl ICAKDTKJOYSXGC-UHFFFAOYSA-K 0.000 claims description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 230000001699 photocatalysis Effects 0.000 abstract description 20
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 12
- 239000003054 catalyst Substances 0.000 abstract description 10
- 239000001257 hydrogen Substances 0.000 abstract description 10
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 10
- 239000001301 oxygen Substances 0.000 abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 abstract description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 6
- 230000003197 catalytic effect Effects 0.000 abstract description 6
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- 238000007873 sieving Methods 0.000 description 3
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 238000003917 TEM image Methods 0.000 description 2
- 239000002585 base Substances 0.000 description 2
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- 238000000926 separation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- 229910002451 CoOx Inorganic materials 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
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- VRIVJOXICYMTAG-IYEMJOQQSA-L iron(ii) gluconate Chemical compound [Fe+2].OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O.OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O VRIVJOXICYMTAG-IYEMJOQQSA-L 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
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- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
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- 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
- B01J27/047—Sulfides with chromium, molybdenum, tungsten or polonium
- B01J27/051—Molybdenum
- B01J27/0515—Molybdenum with iron group metals or platinum group metals
-
- 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
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Abstract
本发明公开了一种MoS2@CrOx/La,Al‑SrTiO3/CoOOH光催化剂及制备方法,属于光催化纳米材料的合成技术领域,所述催化剂能实现在紫外—可见光下的光催化反应,在光催化反应中具有很好的催化活性和稳定性,且制备工艺操作简单,反应条件温和,所用试剂价格低廉。本发明涉及了一种新型光催化纳米材料La,Al双金属离子共掺SrTiO3,并担载MoS2@CrOx为析氢助催化剂,CoOOH为析氧助催化剂,La,Al摩尔占比分别为1%~10%,助催化剂担载量为0.5wt%‑5wt%的不同的MoS2@CrOx/La,Al‑SrTiO3/CoOOH复合纳米光催化材料。
Description
技术领域
本发明属于光催化纳米材料的合成技术领域,尤其涉及一种MoS2@CrOx/La,Al-SrTiO3/CoOOH光催化剂及制备方法。
背景技术
半导体光催化在温和条件下能促成多类困难的化学反应有利进行,例如光催化降解有机物、光催化合成氨、甲醇及其它高附加值的化工原料,光催化分解水等,这被认为是一种将光子能量转化为化学能的关键技术。由于氢具有较高的燃烧热值和环境友好性,被认为是一种清洁的替代能源,2 mol的水分解可生成2 mol的氢气和1 mol氧气,在以光能源的利用为前提转化成可存储的氢能时,光催化纯水分解技术就以很高的水准可能替代化石燃料的纯粹消耗机制,因而成为研究热门。但是水分解反应是一个热力学上的“爬坡”过程,分解水占用的大比重能耗致使水分解产氢的策略无法大面积投入实际生产。
自从1972年Fujishima和Honda利用金红石型TiO2阳极和铂阴极进行光电化学的水分解以来,人们一直致力于构建高效的多相光催化的研究。到目前为止,已经有大量的半导体光催化剂被研究出来,如硫化物(CdS)、氮化物(Ta3N5)和金属氧化物(TiO2)等。SrTiO3具有简单的立方钙钛矿结构,还原后为n型半导体,禁带宽度为3.2 eV。在研究早期,SrTiO3已经被一些尝试证明可以作为光电极电解水产氢。截至目前,SrTiO3基半导体材料又被证实可在无偏压下转化太阳能进行纯水分解。然而如何促进光生载流子的激发,以及载流子的分离和迁移效率的进一步提高,都是目前该领域研究是重中之重。
有许多手段用于改善材料的光催化活性,其中,元素掺杂是最常用的手段之一。许多研究表明SrTiO3结构存在本征缺陷,Ti3+的存在降低了其催化活性;研究发现Rh3+金属离子掺杂可以提升SrTiO3材料的光催化活性,但几次光激发循环后易导致Rh4+价态的形成,致使光催化活性降低;日本东京大学Domen等报导,Al3+单一金属离子掺杂SrTiO3光催化剂展示了很高的光催化活性,但由于Al3+占据Ti位后,导致SrTiO3基半导体整体电荷不平衡,从而造成催化活性和稳定性下降。而有研究表面,Sr2+阳离子位的金属离子取代,如La3+则有利于Rh3+掺杂到SrTiO3晶体结构中并稳定其结构晶型,降低了形成能从而提高了析氢速率。
此外,提升光催化水分解活性的重要手段之一是担载析氢端和析氧端助催化剂,用以加速电子—空穴对的分离。常用的析氢助催化剂有Pt、Rh、Ru等贵金属,析氧助催化剂有IrOx、CoOx等。由于贵金属催化剂储量稀少,价格昂贵,且具有很大的功函数,在光催化水分解中的氧还原逆反应较为明显,致使光催化纯水分解效率低下。
发明内容
本发明提供了一种MoS2@CrOx/La,Al-SrTiO3/CoOOH光催化剂及制备方法,所述催化剂能实现在紫外—可见光下的光催化反应,而且在光催化反应中具有很好的催化活性和稳定性。
为实现以上目的,本发明采用以下技术方案:
一种MoS2@CrOx/La,Al-SrTiO3/CoOOH光催化剂,所述光催化剂为La,Al双金属离子共掺SrTiO3,并担载MoS2@CrOx和CoOOH为助催化剂。
以上所述催化剂中,所述La、Al摩尔占比分别为1%~10%,所述La、Al为等摩尔比,MoS2@CrOx担载量为0.5wt%-5wt%,CoOOH担载量为0.5wt%-5wt%。
一种MoS2@CrOx/La,Al-SrTiO3/CoOOH光催化剂的制备方法,包括以下步骤:
(1)将等量摩尔比的含镧化合物和含铝化合物与SrTiO3纳米颗粒均匀球磨混合1~24小时;
(2)将步骤(1)中球磨混合好的含镧化合物、含铝化合物和SrTiO3再与过量SrCl2均匀搅拌后,于800-1300℃保温4-12小时;
(3)将步骤(2)高温热处理后的样品洗涤除去多余的SrCl2,干燥后得到La,Al-SrTiO3纳米颗粒;
(4)将步骤(3)得到的La,Al-SrTiO3与MoS2纳米片以及铬盐均匀研磨混合1-4小时,在惰性气体保护下,200-500℃保温1-5小时,得到MoS2@CrOx/La,Al-SrTiO3;
(5)将步骤(4)得到的MoS2@CrOx/La,Al-SrTiO3复合材料置于一定浓度的Co盐水溶液中,紫外光源照射下反应1-10小时,在其表面生成担载量为0.5wt%-5wt%的CoOOH纳米颗粒,最后经过水洗过滤,烘干后得到MoS2@CrOx/La,Al-SrTiO3/CoOOH纳米复合光催化剂材料。
以上所述步骤中,步骤(1)中所述的含镧化合物为氧化镧、碳酸镧、醋酸镧、硝酸镧、氯化镧中的一种或多种,所述含铝化合物为氧化铝、碳酸铝、醋酸铝、硝酸铝氯化铝中的一种或多种;
步骤(3)中所述La,Al-SrTiO3纳米颗粒尺寸为200-500纳米;
步骤(4)中所述MoS2纳米片为(NH4)2MoS4 在400℃热解剥离后形成的,所述铬盐化合物为硝酸铬、氯化镉、乙酸镉中的一种或多种;
步骤(5)中Co盐化合物为硝酸钴、氯化钴、硫酸钴、醋酸钴中的一种或多种。
有益效果:本发明提供了一种MoS2@CrOx/La,Al-SrTiO3/CoOOH光催化剂及制备方法,所述光催化剂为La,Al双金属离子共掺SrTiO3,并担载MoS2@CrOx为析氢助催化剂,CoOOH为析氧助催化剂,相比于单一金属离子如Al掺杂SrTiO3材料以及其他双金属离子掺杂SrTiO3材料,具有更稳定的结构;本发明的催化剂能实现在紫外—可见光下的光催化反应,光催化分解水的反应中能实现可见光下分解纯水,在光催化反应中具有很好的催化活性和稳定性;而且本发明制备工艺操作简单,反应条件温和,所用试剂价格低廉。
附图说明
图1是本发明实施例1制得的MoS2@CrOx/La,Al-SrTiO3/CoOOH透射电镜图;
图2是本发明实施例3制得的MoS2@CrOx/La,Al-SrTiO3/CoOOH光催化水分解活性图。
图3是本发明实施例3制得的MoS2@CrOx/La,Al-SrTiO3/CoOOH光催化水分解稳定性图。
具体实施方式
下面结合附图和具体实施例对本发明进行详细说明:
实施例1
一种MoS2@CrOx/La,Al-SrTiO3/CoOOH光催化剂的制备方法,包括以下步骤:
分别称取0.008mol的硝酸镧、0.008mol的硝酸铝和0.084mol的SrTiO3,在玛瑙研钵中混合研磨1h,将研磨后的混合物置于球磨机中,4000转速下球磨10h,再加入1mol的SrCl2继续球磨1h。将球磨后的混合物过筛分离,并置于马弗炉中,在800度下保温12小时。取出后用大量去离子水抽滤洗涤,随后将材料置于干燥箱中80度过夜干燥,即得到La,Al-SrTiO3纳米颗粒。将La,Al-SrTiO3与占质量比2.0wt%的(NH4)2MoS4 400度热解剥离后形成的MoS2纳米片以及铬盐均匀研磨混合4小时,在惰性气体保护下,500度保温4小时,得到MoS2@CrOx/La,Al-SrTiO3,再将MoS2@CrOx/La,Al-SrTiO3复合材料置于0.05M的Co盐水溶液中,紫外光源照射下反应5小时,在其表面生成担载量为5wt%的CoOOH纳米颗粒,最后经过水洗过滤,烘干后得到MoS2@CrOx/La,Al-SrTiO3/CoOOH纳米复合光催化剂材料。
上述方法制备得到的MoS2@CrOx/La,Al-SrTiO3/CoOOH透射电镜图如图1所示,La,Al-SrTiO3纳米颗粒尺寸为200-500纳米,MoS2@CrOx和CoOOH助催化剂纳米颗粒均匀分散在La,Al-SrTiO3纳米颗粒表面。
实施例2
一种MoS2@CrOx/La,Al-SrTiO3/CoOOH光催化剂的制备方法,包括以下步骤:
分别称取0.005mol的硝酸镧、0.005mol的硝酸铝和0.09mol的SrTiO3,在玛瑙研钵中混合研磨1h,将研磨后的混合物置于球磨机中,4000转速下球磨24h,再加入1mol的SrCl2继续球磨1h。将球磨后的混合物过筛分离,并置于马弗炉中,在1000度下保温8小时。取出后用大量去离子水抽滤洗涤,随后将材料置于干燥箱中80度过夜干燥,即得到La,Al-SrTiO3纳米催化剂材料。将La,Al-SrTiO3与占质量比1.0wt%的(NH4)2MoS4 400度热解剥离后形成的MoS2纳米片以及铬盐均匀研磨混合4小时,在惰性气体保护下,400度保温2小时,得到MoS2@CrOx/La,Al-SrTiO3。再将MoS2@CrOx/La,Al-SrTiO3复合材料置于0.05M的Co盐水溶液中,紫外光源照射下反应10小时,在其表面生成担载量为5wt%的CoOOH纳米颗粒,最后经过水洗过滤,烘干后得到MoS2@CrOx/La,Al-SrTiO3/CoOOH纳米复合光催化剂材料。
实施例3
一种MoS2@CrOx/La,Al-SrTiO3/CoOOH光催化剂的制备方法,包括以下步骤:
分别称取0.001mol的硝酸镧、0.001mol的硝酸铝和0.098mol的SrTiO3,在玛瑙研钵中混合研磨1h,将研磨后的混合物置于球磨机中,4000转速下球磨24h,再加入1mol的SrCl2继续球磨1h。将球磨后的混合物过筛分离,并置于马弗炉中,在800度下保温4小时。取出后用大量去离子水抽滤洗涤,随后将材料置于干燥箱中80度过夜干燥,即得到La,Al-SrTiO3纳米催化剂材料。将La,Al-SrTiO3与占质量比0.5wt%的(NH4)2MoS4 400度热解剥离后形成的MoS2纳米片以及铬盐均匀研磨混合4小时,在惰性气体保护下,500度保温4小时,得到MoS2@CrOx/La,Al-SrTiO3。再将MoS2@CrOx/La,Al-SrTiO3复合材料置于0.05M的Co盐水溶液中,紫外光源照射下反应1小时,在其表面生成担载量为5wt%的CoOOH纳米颗粒,最后经过水洗过滤,烘干后得到MoS2@CrOx/La,Al-SrTiO3/CoOOH纳米复合光催化剂材料,所述光催化剂为La,Al双金属离子共掺SrTiO3,并担载MoS2@CrOx为析氢助催化剂和CoOOH为析氧助催化剂。
将上述制备得到的MoS2@CrOx/La,Al-SrTiO3/CoOOH纳米复合催化剂材料在300W氙灯紫外-可见全光谱照射纯水中测试其光催化水分解性能,催化剂用量为20mg,纯水200ml,光源为300WXe灯,如图2所示,前2小时氢气析出速率为580μmol/h/g,氧气析出速率为256μmol/h/g,8小时后氢气析出量为2568μmol/g,氧气析出量为1180μmol/g,氢氧比接近2:1。制得的催化剂循环稳定性如图3所示,以每5小时为一次循环,同一催化剂材料重复5次,可以看出该催化剂在第一个循环结束后会有一定程度衰减,催化活性保持率约为70%,而随后的4次循环实验中,没有明显的活性衰减。
以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下还可以作出若干改进,这些改进也应视为本发明的保护范围。
Claims (8)
1.一种MoS2@CrOx/La,Al-SrTiO3/CoOOH纳米复合光催化剂的制备方法,其特征在于,包括以下步骤:
(1)将等量摩尔比的含镧化合物和含铝化合物与SrTiO3纳米颗粒均匀球磨混合1~24小时;
(2)将步骤(1)中球磨混合好的含镧化合物、含铝化合物和SrTiO3再与过量SrCl2均匀搅拌后,于800-1300℃保温4-12小时;
(3)将步骤(2)高温热处理后的样品洗涤除去多余的SrCl2,干燥后得到La,Al-SrTiO3纳米颗粒;
(4)将步骤(3)得到的La,Al-SrTiO3与MoS2纳米片以及铬盐均匀研磨混合1-4小时,在惰性气体保护下,200-500℃保温1-5小时,得到MoS2@CrOx/La,Al-SrTiO3;
(5)将步骤(4)得到的MoS2@CrOx/La,Al-SrTiO3复合材料置于一定浓度的Co盐水溶液中,紫外光源照射下反应1-10小时,在其表面生成担载量为0.5wt%-5wt%的CoOOH纳米颗粒,最后经过水洗过滤,烘干后得到MoS2@CrOx/La,Al-SrTiO3/CoOOH纳米复合光催化剂材料。
2.根据权利要求1所述的MoS2@CrOx/La,Al-SrTiO3/CoOOH纳米复合光催化剂的制备方法,其特征在于,步骤(1)中所述的含镧化合物为氧化镧、碳酸镧、醋酸镧、硝酸镧、氯化镧中的一种或多种,所述含铝化合物为氧化铝、碳酸铝、醋酸铝、硝酸铝、氯化铝中的一种或多种。
3.根据权利要求1所述的MoS2@CrOx/La,Al-SrTiO3/CoOOH纳米复合光催化剂的制备方法,其特征在于,步骤(3)中所述La,Al-SrTiO3纳米颗粒尺寸为200-500纳米。
4.根据权利要求1所述的MoS2@CrOx/La,Al-SrTiO3/CoOOH纳米复合光催化剂的制备方法,其特征在于,步骤(4)中所述MoS2纳米片为(NH4)2MoS4 在400℃热解剥离后形成的,所述铬盐化合物为硝酸铬、氯化镉、乙酸镉中的一种或多种。
5.根据权利要求1所述的MoS2@CrOx/La,Al-SrTiO3/CoOOH纳米复合光催化剂的制备方法,其特征在于,步骤(5)中Co盐化合物为硝酸钴、氯化钴、硫酸钴、醋酸钴中的一种或多种。
6.权利要求1-5任一项所述方法制备的MoS2@CrOx/La,Al-SrTiO3/CoOOH纳米复合光催化剂,其特征在于,所述光催化剂为La,Al双金属离子共掺SrTiO3,并担载MoS2@CrOx和CoOOH为助催化剂。
7.根据权利要求6所述的MoS2@CrOx/La,Al-SrTiO3/CoOOH纳米复合光催化剂,其特征在于,所述La、Al摩尔占比分别为1%~10%,MoS2@CrOx担载量为0.5wt%-5wt%,CoOOH担载量为0.5wt%-5wt%。
8.根据权利要求6或7所述的MoS2@CrOx/La,Al-SrTiO3/CoOOH纳米复合光催化剂,其特征在于,所述La、Al为等摩尔比。
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