CN113952967A - 一种二维多孔Bi5O7I纳米片光催化剂及其制备方法 - Google Patents
一种二维多孔Bi5O7I纳米片光催化剂及其制备方法 Download PDFInfo
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Abstract
本发明涉及一种超薄二维多孔Bi5O7I纳米片光催化剂及其制备方法。利用价格较为低廉的五水合硝酸铋和碘化钾分别作为铋源和碘源，利用共沉淀法和固相烧结法制备出超薄二维多孔Bi5O7I纳米片，其超薄结构有利于缩短电荷体相传输距离，降低体相电子空穴复合几率，其多孔结构对污染物具有较强的吸附能力，提高了污染物与催化剂的接触几率，这些结构特点都有利于光催化效率的提高。并且条件反应温和，污染小。具有良好的光催化性能。此外且通过光还原的方法，进一步改善了其光催化性能。为光催化材料的研发工作提供了一定的借鉴，并拥有良好的应用前景。
Description
技术领域
本发明涉及及碘氧铋三元化合物材料制备领域，尤其涉及一种超薄二维多孔Bi5O7I纳米片光催化剂及其制备方法。
背景技术
近年来随着社会的发展，光催化剂被广泛研究并被应用于降解污水中的染料、有机物等，例如TiO2、ZnO等但由于其禁带宽度过大、易团聚等缺点影响了其进一步应用近年来随着社会的发展，光催化剂被广泛研究并被应用于降解污水中的染料、有机物等，例如TiO2、ZnO等但由于其禁带宽度过大、易团聚等缺点影响了其进一步应用。BiOX（X=Cl、Br、I）做为一种重要的三元结构（V−VI−VII）半导体材料，具有独特的层状结构、合适的价带宽度、较大的可见光响应范围，被认为是具有开发前景和应用潜力的光催化材料。Bi5O7I作为BiOI的一种富铋衍生物，在禁带宽度上它具有较宽的带隙值（2.83-2.94eV）以及合适的能带位置，具有较强的光催化氧化还原能力。目前大部分Bi5O7I可以通过水热法、溶剂热法、固相烧结法和常温自组装法制备。通过以上方法制备的Bi5O7I材料大多数颗粒粒径较大、比表面积小、光催化活性有待提高。众所周知，形貌对于光催化材料的光吸收、电子与空穴分离以及活性位点暴露调控非常重要。并且二维光催化材料能够减小体相电子向表面迁移距离，有效促进电子与空穴分离，有利于改善光催化活性。
发明内容
本发明所要解决的技术问题是提供一种Bi5O7I纳米片的制备方法，能够利用较为廉价原料和简便的途径合成Bi5O7I，制得的Bi5O7I具有良好的光催化性能。
本发明提出一种超薄二维多孔Bi5O7I纳米片光催化剂的制备方法，包括以下步骤：
(1)将一定量的五水合硝酸铋作为铋源、碘化钾作为碘源加入到一定量的蒸馏水中，并分别搅拌和超声各半个小时，获得前驱体溶液；
(2)将步骤(1)得到的前驱体溶液用一定浓度的氢氧化钠溶液调节Ph至6.98-7.02后升温至80oC水浴加热并搅拌5 h，之后进行离心洗涤，并烘干，得到均匀分散的所述BiOI纳米片；
(3)将步骤(2)得到的BiOI纳米片进行研磨后取0.55g放入坩埚，以5 oC/min的升温速率升温至400-600oC，并保温煅烧20-120 min，之后自然冷却得到Bi5O7I；
(4)将步骤(3)得到的样品利用一定浓度的PVP溶液、乙二醇溶液、甲醇溶液对样品进行光还原处理，离心干燥得到样品；
作为优选，在步骤(1)中，所述五水合硝酸铋和碘化钾的用量均为5 mmol。作为优选, 在步骤(2)中，PH调节过程使用1 mol/L和0.1 mol/L的氢氧化钠溶液。作为优选，在步骤(2)中，在PH值调节至4之前，用1 mol/L的氢氧化钠溶液调节，当PH值达到4时，用0.1mol/L的氢氧化钠溶液进行调节。作为优选，在步骤(2)中，水浴温度为60-80 oC，烘干温度为60-80oC，烘干时间为8-12 h。作为优选，在步骤(4)中加入20 mL20%体积比甲醇、乙二醇溶液或25 mL质量分数为5%的PVP溶液。作为优选，在步骤(4)中，光还原过程中用500瓦汞灯不加滤光片照射10-60 min。
本发明还包括一种上述所述的制备方法制备的超薄二维多孔Bi5O7I纳米片光催化剂。
采用上述技术方案所产生的有效效果在于：本发明提供了一种简便的制备超薄二维多孔Bi5O7I纳米片的方法，使用价格较为低廉的五水合硝酸铋和碘化钾分别作为铋源和碘源，制备出超薄二维多孔Bi5O7I纳米片，其超薄结构有利于缩短电荷体相传输距离，降低体相电子空穴复合几率，其多孔结构对污染物具有较强的吸附能力，提高了污染物与催化剂的接触几率，这些结构特点都有利于光催化效率的提高。并且条件反应温和，污染小。具有良好的光催化性能。此外且通过光还原的方法，进一步改善了其光催化性能。为光催化材料的研发工作提供了一定的借鉴，并拥有良好的应用前景。
附图说明
通过参考附图会更加清楚的理解本发明的特征和优点，附图是示意性的而不应理解为对本发明进行任何限制，在附图中
图1为本发明实施例1合成的超薄二维多孔Bi5O7I纳米片光催化剂的XRD图。
图2为本发明实施例1合成的超薄二维多孔Bi5O7I纳米片光催化剂的SEM图。
图3为本发明实施例1-6（S1-4）所合成的超薄二维多孔Bi5O7I纳米片光催化剂在模拟太阳光照射下对罗丹明B的降解效率。
Claims (5)
1.一种超薄二维多孔Bi5O7I纳米片光催化剂的制备方法，其特征在于，包括以下步骤：(1)将一定量的五水合硝酸铋作为铋源、碘化钾作为碘源加入到一定量的蒸馏水中，并分别搅拌和超声各半个小时，获得前驱体溶液；(2)将步骤(1)得到的前驱体溶液用一定浓度的氢氧化钠溶液调节Ph至6.98-7.02后升温至80oC水浴加热并搅拌5 h，之后进行离心洗涤，并烘干，得到均匀分散的所述BiOI纳米片；(3)将步骤(2)得到的BiOI纳米片进行研磨后取0.55克放入坩埚，以5 oC/min的升温速率升温至400-600oC，并保温煅烧20-120 min，之后自然冷却得到Bi5O7I；(4)将步骤(3)得到的样品利用一定浓度的PVP溶液、乙二醇溶液、甲醇溶液对样品进行光还原处理，离心干燥得到样品。
2.根据权利要求1所述的制备方法，其特征在于，在步骤(1)中，所述五水合硝酸铋和碘化钾的用量均为5 mmol。
3.根据权利要求1所述的制备方法，其特征在于，在步骤(2)中，PH调节过程使用1 mol/L和0.1 mol/L的氢氧化钠溶液；在PH值调节至4之前，用1 mol/L的氢氧化钠溶液调节，当PH值达到4时，用0.1 mol/L的氢氧化钠溶液进行调节；水浴温度为60-80 oC，烘干温度为60-80oC，烘干时间为8-12 h。
4.根据权利要求1所述的制备方法，其特征在于，在步骤(4)中加入20 mL20%体积比甲醇、乙二醇溶液或25 mL质量分数为5%的PVP溶液；光还原过程中用500瓦汞灯不加滤光片照射10-60 min。
5.一种如权利要求1-4任一项所述的制备方法制备的超薄二维多孔Bi5O7I纳米片光催化剂。
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