CN106311220B - 一种Bi2MoO6/TiO2/RGO复合光催化剂及其制备方法 - Google Patents
一种Bi2MoO6/TiO2/RGO复合光催化剂及其制备方法 Download PDFInfo
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- DKUYEPUUXLQPPX-UHFFFAOYSA-N dibismuth;molybdenum;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Mo].[Mo].[Bi+3].[Bi+3] DKUYEPUUXLQPPX-UHFFFAOYSA-N 0.000 abstract description 10
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- PPNKDDZCLDMRHS-UHFFFAOYSA-N dinitrooxybismuthanyl nitrate Chemical class [Bi+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O PPNKDDZCLDMRHS-UHFFFAOYSA-N 0.000 description 1
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/31—Chromium, molybdenum or tungsten combined with bismuth
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Abstract
本发明涉及一种Bi2MoO6/TiO2/RGO复合光催化剂及其制备方法,该方法通过简单的水热法,以钼酸铵和硝酸铋为反应物制备钼酸铋纳米材料;采用水热法,以氧化石墨为原料制备还原氧化石墨烯(RGO);最后采用共沉淀法制备Bi2MoO6/TiO2/RGO可见光催化材料。该方法制备过程简单易控、操作方便、成本低、产物的可见光催化活性高。
Description
技术领域
本发明属于纳米材料制备的技术领域,特别涉及了 Bi2MoO6/TiO2/RGO复合光催化剂及其制备方法。
背景技术
光催化是解决环境污染和能源问题最有希望的技术之一。它可以利用太阳能,将绝大多数水体和空气中的有害物质降解为水、二氧化碳等无机小分子,而且能分解水制氢,具有高效节能、清洁无毒、无二次污染和工艺简单等优点。
含有不同比例的铋、钼、氧等复合氧化物统称为钼酸铋,根据铋、钼、氧比例不同,钼酸铋具有多种不同的组成与结构。钼酸铋材料是一类广泛应用于光学、电学和催化等方面的功能材料,近年来,对于纳米尺寸的钼酸铋的制备工艺、微观结构、物理和化学性能的研究也逐渐成为研究人员的热点问题,多种不同组成、结构及形貌的钼酸铋纳米材料被研究报道,并在电化学、磁学、催化、抗菌等领域显示出优异的性能。钼酸铋具有非常优秀的光催化剂性能。能够分解空气中部分对人体有害无机物质和几乎全部有害有机物质。对净化空气、净化环境起到非常重要的作用。但是,通过一般手段合成的钼酸铋粒径较大,光生电荷传输到表面的距离较长,而且其传输电荷的能力较差,因此造成了严重的体相电荷充足,其量子效率较低无法满足实际应用。
这就急需一种能够解决上述问题的钼酸铋的制备方法。
发明内容
本发明的目的是要提供一种Bi2MoO6/TiO2/RGO复合光催化剂,该光催化剂的比表面积增大,有利于光催化效率的提高,改变 Bi2MoO6的形貌,提高量子效率和光催化效率,提高光生电荷的分离效率。
本发明的技术方案是:
Bi2MoO6/TiO2/RGO复合光催化剂是由Bi2MoO6、TiO2和RGO 组成,所述Bi2MoO6、TiO2和RGO重量份数比为15:3:3。
本发明的有益效果是:
1.改变一般手段合成Bi2MoO6的形貌,以Bi2MoO6纳米片为原料,克服粒径大导致的弊端,从而提高量子效率和光催化效率。
2.Bi2MoO6/TiO2/RGO之间形成异质结,从而提高了光生电荷的分离效率。
3.RGO的引入可以有效增大光催化剂的比表面积,有利于光催化效率的提高。
4.本发明公开的Bi2MoO6/TiO2/RGO制备方法,简单易行,成本较低,可重复性高。产物的可见光催化活性高,在复合纳米材料的制备和应用领域有着广阔的发展前景。
附图说明
图1为本申请所述光催化剂制备流程示意图。
图2为所制备样品的XRD图。
图3为所制备样品的FT-IR图。
图4所制备的样品的DRS图。
图5a所制备复合催化剂Bi2MoO6/TiO2/RGO的TEM照片。
图5b所制备复合催化剂Bi2MoO6/TiO2/RGO的HRTEM照片。
具体实施方式
Bi2MoO6/TiO2/RGO复合光催化剂是由Bi2MoO6、TiO2和RGO 组成,Bi2MoO6、TiO2和RGO重量比为15:3:3。
复合光催化剂的制备方法:
1.Bi2MoO6的制备:采用水热合成法,将1mmol钼酸铵溶解于 10mL去离子水中,将7mmol硝酸铋溶解于5mL去离子水中,在磁力搅拌下将硝酸铋溶液缓慢滴加到钼酸铵溶液中,滴加完毕后继续搅拌30min,搅拌过程中调节pH=14。搅拌结束后再超声分散30min。将超声后的混合物装入内衬聚四氟乙烯不锈钢反应釜中,充填度为 70%,加热到160℃并保持24h后自然冷却到室温。用去离子水和乙醇分别洗涤沉淀物3次后,在60℃条件下将产物进行干燥。
2.TiO2的制备:将25mL异丙醇加入到5mL钛酸丁酯溶液中,搅拌均匀后向上述混合溶液中缓慢滴入30mL HAc溶液(ω=15%),滴加过程中剧烈搅拌,滴加完毕后,加热条件下搅拌8h,然后加入1g 聚乙二醇(PEG800),将水热前躯体加入内衬聚四氟乙烯不锈钢反应釜中,充填度约80%,230℃下水热反应12h。得到TiO2胶体溶液,除去有机溶液得到胶体,将胶体用马弗炉在450℃下热处理30min 后的得到目标产物。
3.RGO的制备:以Hummer法制备的氧化石墨为原料,将50mg 氧化石墨分散在75mL浓硫酸和25mL浓硝酸的混合液中,于100℃回流8h,然后用0.22μm孔的筛子过滤去除酸液。所得到的棕色固体分散在15mL去离子水后装入内衬聚四氟乙烯不锈钢反应釜中, 200℃下水热反应24h后,所得的悬浮液经高速离心分离后得到目标产物。
4.Bi2MoO6/TiO2/RGO的制备:将0.16g Bi2MoO6分散到10mL 去离子水中,加入0.01gPEG800;将0.032g TiO2和0.032g RGO 分散到5mL去离子水中。将TiO2和RGO混合悬浊液滴加到Bi2MoO6的悬浊液中,滴加完毕后磁力搅拌1h。离心分离,得到沉淀。将沉淀分别用去离子水和无水乙醇洗涤2次后,于真空干燥箱内70℃烘干,即得Bi2MoO6/TiO2/RGO复合光催化剂。
图2为所制备样品的XRD图。从图2可知所制备的复合光催化剂中含有钼酸铋及二氧化钛,由于RGO为非晶材料故没有其对应峰。
图3为所制备样品的FT-IR图。所有RGO的特征峰(1740cm-1、 1634cm-1、1381cm-1、1041cm-1)都可以从Bi2MoO6/TiO2/RGO图谱中可以观察到,说明RGO的成功负载。
图4所制备的样品的DRS图。纯Bi2MoO6在小于500nm的波长范围产生强吸收,TiO2/RGO在小于400nm的波长范围产生强吸收。 Bi2MoO6/RGO较Bi2MoO6/TiO2在可见光区显示出了更强的吸收能力。Bi2MoO6/TiO2/RGO在可见光范围内展现出与Bi2MoO6/RGO相似的吸收能力,可知对可见光吸收能力的提高主要来自RGO而不是 TiO2。石墨烯提高了光催化材料对可见光的吸收能力,从而提高了太阳能的利用率。
图5所制备复合催化剂Bi2MoO6/TiO2/RGO的TEM及HRTEM 照片。其中图5a为所制备的Bi2MoO6/TiO2/RGO样品的TEM照片,其形貌为片状,并且可知TiO2以及RGO的负载并未对Bi2MoO6形貌形成大的影响。图5b中可以测量出晶体条纹距离分别为0.316和0.249 nm,分别对应Bi2MoO6(131)和TiO2(101)的晶面间距。
Claims (1)
1.一种Bi2MoO6/TiO2/RGO复合光催化剂,其特征在于:是由Bi2MoO6、TiO2和RGO组成,所述Bi2MoO6、TiO2和RGO重量份数比为15:3:3;
具体制备方法包括以下步骤:
1)Bi2MoO6的制备:采用水热合成法,将摩尔比1:7钼酸铵和硝酸铋分别溶于体积比2:1的去离子水中,在磁力搅拌下将硝酸铋溶液缓慢滴加到钼酸铵溶液中,滴加完毕后继续搅拌30min,搅拌过程中调节pH=14,搅拌结束后再超声分散30min,将超声后的混合物装入内衬聚四氟乙烯不锈钢反应釜中,充填度为70%,加热到160℃并保持24h后自然冷却到室温,用去离子水和乙醇分别洗涤沉淀物3次后,在60℃条件下将产物进行干燥;
2)TiO2的制备:将异丙醇加入到钛酸丁酯溶液中,异丙醇与钛酸丁酯溶液体积比5:1,搅拌均匀后向上述混合溶液中缓慢滴入ω=15%的HAc溶液,HAc溶液与上述混合溶液体积比1:1,滴加过程中剧烈搅拌,滴加完毕后,加热条件下搅拌8h,然后加入与异丙醇质量比为10:1的PEG800,将水热前躯体加入内衬聚四氟乙烯不锈钢反应釜中,充填度约80%,230℃下水热反应12h,得到TiO2胶体溶液,除去有机溶液得到胶体,将胶体用马弗炉在450℃下热处理30min后的得到目标产物;
3)RGO的制备:以Hummer法制备的氧化石墨为原料,将氧化石墨分散在体积比为3:1的浓硫酸和浓硝酸的混合液中,于100℃回流8h,然后用0.22μm孔的筛子过滤去除酸液,所得到的棕色固体装入内衬聚四氟乙烯不锈钢反应釜中,200℃下水热反应24h后,所得的悬浮液经高速离心分离后得到目标产物;
4)Bi2MoO6/TiO2/RGO的制备:将TiO2和RGO分别溶于去离子水中,同时将Bi2MoO6溶解于去离子水中,去离子水的体积比为1:1:2;在Bi2MoO6溶液中加入PEG800,Bi2MoO6、TiO2、RGO和PEG800的质量比为:15:3:3:1;将TiO2和RGO悬浊液缓慢滴加到Bi2MoO6悬浊液中,滴加完毕后磁力搅拌1h,离心分离,得到沉淀,将沉淀分别用去离子水和无水乙醇洗涤2次后,于真空干燥箱内70℃烘干,即得Bi2MoO6/TiO2/RGO复合光催化剂。
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