CN115058018B - 一种Fe基金属有机框架材料制备方法及固氮应用 - Google Patents
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 239000000463 material Substances 0.000 title claims abstract description 28
- 239000013082 iron-based metal-organic framework Substances 0.000 title claims abstract description 22
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims abstract description 5
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000011259 mixed solution Substances 0.000 claims abstract description 21
- 238000005406 washing Methods 0.000 claims abstract description 19
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims abstract description 18
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims abstract description 18
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000002904 solvent Substances 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000243 solution Substances 0.000 claims abstract description 10
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims abstract description 9
- 235000019253 formic acid Nutrition 0.000 claims abstract description 9
- 230000001699 photocatalysis Effects 0.000 claims abstract description 9
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 9
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 9
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 9
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 9
- 239000010935 stainless steel Substances 0.000 claims abstract description 9
- 238000001291 vacuum drying Methods 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract 2
- 239000002184 metal Substances 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 238000007146 photocatalysis Methods 0.000 abstract description 3
- 230000002779 inactivation Effects 0.000 abstract description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 11
- 102000004190 Enzymes Human genes 0.000 description 7
- 108090000790 Enzymes Proteins 0.000 description 7
- 229910021529 ammonia Inorganic materials 0.000 description 6
- 239000012621 metal-organic framework Substances 0.000 description 5
- 239000011941 photocatalyst Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000000975 bioactive effect Effects 0.000 description 1
- 238000004178 biological nitrogen fixation Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
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- 239000003337 fertilizer Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000027756 respiratory electron transport chain Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004729 solvothermal method Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
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Abstract
本发明公开了一种Fe基金属有机框架材料制备方法及固氮应用。本发明方法首先用N,N‑二甲基甲酰胺(DMF)溶剂和甲酸溶液配置成混合液;然后将氯化铁和3,3’,5,5’‑偶氮苯四羧酸加入混合液中,搅拌后放入含有聚四氟乙烯内胆的不锈钢反应釜中,120~180℃下保温6~24小时;将反应产物用N,N‑二甲基甲酰胺溶剂和无水乙醇洗涤多次,真空干燥后得到Fe基金属有机框架材料。本发明还提供了用该方法制备的Fe基金属有机框架材料在光催化固氮中的应用。本发明方法制备的Fe基金属有机框架材料具有立方体形状,结构稳定,不易失活。本发明方法工艺简单,环境友好,在光催化响应可见光,具有高效还原氮气的性能。
Description
技术领域
本发明属于半导体材料领域,涉及铁基金属有机骨架材料,具体是一种Fe基金属有机框架材料(MOF)的制备方法及固氮应用。
背景技术
氨是一种重要的化学品,常用于生成化肥、纤维、药物等。目前世界上氨的生产工艺任然采用以氮气和氢气为原料的Haber-Bosch法。该方法提供了全球大部分氨的产量,同时高温(573-773K)和高压(100-200atm)的反应需要消耗大量的能量。考虑到缓解全球温室效应带来的影响,为了减少CO2等温室气体的排放,因此迫切的需要绿色可持续的新工艺。太阳能的利用为解决传统工艺耗能污染的问题提供的新的思路。近年来光催化固氮成为可能代替Haber-Bosch法的新方法。
自然界当中生物固氮酶经过数百万年进化而产生的复杂生物活性酶,具有高选择性和高效率的特点。固氮酶有三种形式FeMo酶、FeV酶和仅有Fe元素的酶。在酶蛋白中,有两种金属辅助因子,8Fe-7S P-簇(起电子转移作用)和FeMco簇(其中M=Mo、V或Fe),其中的过渡金属通过π回馈(通过将其可用的d轨道电子提供给N-Nπ*反键轨道),这些辅助因子为氮气转化为氨起到重要的作用。Fe元素作为自然界含量最多的金属元素,铁氧化物硫化物等在光催化领域得到了广泛的研究。在光催化NRR中,对Fe元素的研究包括Fe3O4、Fe2O3、FeS、Fe掺杂等各种光催化剂催化剂都受到广泛的研究。然而对于Fe金属有机骨架光催化剂设计和氮气固定的研究并不多。
发明内容
本发明的一个目的在于提供一种Fe基金属有机框架材料制备方法。
本发明方法具体是:
步骤(1)将N,N-二甲基甲酰胺(DMF)溶剂与摩尔浓度为24~26M的甲酸溶液按照体积比1∶0.7~0.8配置成混合液;
步骤(2)将氯化铁(FeCl3)和3,3’,5,5’-偶氮苯四羧酸(H4abtc)加入配置好的混合液中,搅拌0.5~2小时后放入含有聚四氟乙烯内胆的不锈钢反应釜中,120~180℃下保温6~24小时;每升混合液加入氯化铁0.01~0.02摩尔氯化铁、0.005~0.01摩尔3,3’,5,5’-偶氮苯四羧酸;
步骤(3)将反应产物用N,N-二甲基甲酰胺溶剂和无水乙醇洗涤2~5次,30~60℃真空干燥12~36小时,制得Fe基金属有机框架材料。
本发明的另一个目的是提供该Fe基金属有机框架材料在光催化固氮中的应用。
本发明中,Fe-MOF通过溶剂热法制备,通过洗涤干燥得到橙色固体粉末。工作表明,Fe-MOF光催化剂能有效的将氮气转化为氨。
本发明方法制备的Fe基金属有机框架材料具有立方体形状,结构稳定,不易失活。本发明方法工艺简单,无需添加其他有机溶剂,环境友好,在光催化响应可见光,具有高效还原氮气的性能。
附图说明
图1为本发明方法制备的Fe-MOF材料扫描电子显微镜图;
图2为本发明方法制备的Fe-MOF复合材料XRD表征。
具体实施方式
以下结合具体实施例对本发明做进一步的说明,但下述实例绝非对本发明有任何限制。
实施例1.
步骤(1)将32L的N,N-二甲基甲酰胺(DMF)溶剂和24L摩尔浓度为26M的甲酸溶液(98﹪)配置成混合液;
步骤(2)将1mol的氯化铁(FeCl3)和0.5mol的3,3’,5,5’-偶氮苯四羧酸(H4abtc)加入配置好的混合液中,搅拌1小时后放入含有聚四氟乙烯内胆的不锈钢反应釜中,150℃下保温10小时;
步骤(3)将反应产物先用N,N-二甲基甲酰胺溶剂洗涤一次,再用无水乙醇洗涤一次,40℃真空干燥24小时,制得Fe基金属有机框架材料。
为了评价该金属有机框架材料的可行性和形态及分布,利用扫描显微镜对Fe-MOF材料进行表征。通过扫描电子显微镜观察,如图1,显示Fe-MOF为规则立方体结。通过XRD表征了Fe-MOF材料,如图2,可以看出Fe-MOF位于8.3的宽衍射峰,表明该物质具有良好结晶性。
实施例2.
步骤(1)将0.5L的N,N-二甲基甲酰胺(DMF)溶剂与0.4L摩尔浓度为26M的甲酸溶液配置成混合液;
步骤(2)将0.012mol的氯化铁(FeCl3)和0.007mol的3,3’,5,5’-偶氮苯四羧酸(H4abtc)加入配置好的混合液中,搅拌0.5小时后放入含有聚四氟乙烯内胆的不锈钢反应釜中,120℃下保温24小时;
步骤(3)将反应产物先用N,N-二甲基甲酰胺溶剂洗涤再用无水乙醇洗涤,重复洗涤一次,30℃真空干燥36小时,制得Fe基金属有机框架材料。
实施例3.
步骤(1)将0.5L的N,N-二甲基甲酰胺(DMF)溶剂与0.35L摩尔浓度为24M的甲酸溶液配置成混合液;
步骤(2)将0.01mol的氯化铁(FeCl3)和0.005mol的3,3’,5,5’-偶氮苯四羧酸(H4abtc)加入配置好的混合液中,搅拌2小时后放入含有聚四氟乙烯内胆的不锈钢反应釜中,130℃下保温18小时;
步骤(3)将反应产物先用N,N-二甲基甲酰胺溶剂洗涤三次,再用无水乙醇洗涤两次,35℃真空干燥30小时,制得Fe基金属有机框架材料。
实施例4.
步骤(1)将0.58L的N,N-二甲基甲酰胺(DMF)溶剂与0.42L摩尔浓度为25M的甲酸溶液配置成混合液;
步骤(2)将0.015mol的氯化铁(FeCl3)和0.01mol的3,3’,5,5’-偶氮苯四羧酸(H4abtc)加入配置好的混合液中,搅拌45分钟后放入含有聚四氟乙烯内胆的不锈钢反应釜中,160℃下保温10小时;
步骤(3)将反应产物先用无水乙醇洗涤一次,再用N,N-二甲基甲酰胺溶剂洗涤一次,然后用无水乙醇洗涤一次,45℃真空干燥18小时,制得Fe基金属有机框架材料。
实施例5.
步骤(1)将0.57L的N,N-二甲基甲酰胺(DMF)溶剂与0.43L摩尔浓度为25M的甲酸溶液配置成混合液;
步骤(2)将0.02mol的氯化铁(FeCl3)和0.008mol的3,3’,5,5’-偶氮苯四羧酸(H4abtc)加入配置好的混合液中,搅拌90分钟后放入含有聚四氟乙烯内胆的不锈钢反应釜中,180℃下保温6小时;
步骤(3)将反应产物先用无水乙醇洗涤一次,再用N,N-二甲基甲酰胺溶剂洗涤一次,50℃真空干燥15小时,制得Fe基金属有机框架材料。
实施例6.
步骤(1)将0.56L的N,N-二甲基甲酰胺(DMF)溶剂与0.44L摩尔浓度为26M的甲酸溶液配置成混合液;
步骤(2)将0.01mol的氯化铁(FeCl3)和0.005mol的3,3’,5,5’-偶氮苯四羧酸(H4abtc)加入配置好的混合液中,搅拌1小时后放入含有聚四氟乙烯内胆的不锈钢反应釜中,150℃下保温12小时;
步骤(3)将反应产物先用无水乙醇洗涤一次,再用N,N-二甲基甲酰胺溶剂洗涤两次,最后用无水乙醇洗涤一次,60℃真空干燥12小时,制得Fe基金属有机框架材料。
实施例7.
利用实施例1-6任一方法制备得到的Fe基金属有机框架材料,其在光催化固氮中的应用实例:将15mg Fe-MOF催化剂加入到30ml浓度0.25mg/L的K2SO3溶液中,超声5min。通入氮气避光30min。开启光源(300W氙灯全谱)每小时取样1ml,反应5h。工作表明,Fe-MOF光催化剂能有效的将氮气转化为氨。
Claims (2)
1.一种Fe基金属有机框架材料制备方法,其特征在于,具体是:
步骤(1)将N,N-二甲基甲酰胺溶剂与摩尔浓度为24~26M的甲酸溶液按照体积比1:0.7~0.8配置成混合液;
步骤(2)将氯化铁和3,3’,5,5’-偶氮苯四羧酸加入配置好的混合液中,搅拌0.5~2小时后放入含有聚四氟乙烯内胆的不锈钢反应釜中,120~180℃下保温6~24小时;每升混合液加入氯化铁0.01~0.02摩尔氯化铁、0.005~0.01摩尔3,3’,5,5’-偶氮苯四羧酸;
步骤(3)将反应产物用N,N-二甲基甲酰胺溶剂和无水乙醇洗涤2~5次,30~60℃真空干燥12~36小时,制得具有立方体形状的Fe基金属有机框架材料。
2.如权利要求1所述方法制备的Fe基金属有机框架材料在光催化固氮中的应用。
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