CN111514936B - 一种具有空心框架形貌TiO2@MOF异质结光催化剂及其制备方法 - Google Patents
一种具有空心框架形貌TiO2@MOF异质结光催化剂及其制备方法 Download PDFInfo
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Abstract
本发明提供了一种具有空心框架形貌TiO2@MOF异质结光催化剂的制备方法,包括:将钛酸四异丙酯和2‑氨基对苯二甲酸溶解在有机溶剂中后转移至反应釜中加热反应一段时间,反应结束后,离心收集产物,清洗,干燥得到具有方块状结构的NH2‑MIL‑125前驱物;将NH2‑MIL‑125前驱物和丹宁酸溶解在水溶液中得混合溶液,将混合溶液转移至反应釜中,加热反应一段时间,反应结束后,离心收集产物,清洗,干燥,得具有空心框架形貌TiO2@MOF异质结光催化剂。本发明选择丹宁酸作为定向保护剂,然后通过水解方法从内向外蚀刻NH2‑MIL‑125,最终获得了具有{100}面裸露的的TiO2@MOF空心框架结构,所制备的光催化剂TiO2@MOF比纯的TiO2和纯的MOF有更高的光催化活性。
Description
技术领域
本发明涉及纳米材料,具体涉及一种具有空心框架形貌TiO2@MOF异质结光催化剂及其制备方法。
背景技术
金属有机骨架(MOF)是一类由金属离子和有机配体自组装形成的具有多孔网状结构的晶体材料,具有比表面积高,孔径可调,结晶性高和表面易于修饰的优点。NH2-MIL-125(Ti)是一种氨基官能化的Ti基MOF,由于其价格低廉,无毒,对水/光稳定且对可见光敏感的特点,因此已作为可见光光催化剂,用于水净化,制氢,有机合成等光催化领域。类似于其他单组分无机半导体光催化剂,NH2-MIL-125(Ti)在光照射下也会有很高电子- 空穴复合率,从而导致光催化性能的下降。因此提高电荷分离效率可以抑制光生电子和空穴对的复合,从而提高光催化活性。构筑半导体异质结构已被证明是一种提高光生电子和空穴载流子分离效率的有效方法。可以实现在空间上对空穴和电子的分离。此外,材料的空心框架结构中孔可以提高反应分子的扩散效率,暴露更多的活性位点进行催化反应,提高内表面的可用性,进而具备良好的光催化性质。然而设计制备一种具有空心框架形貌 TiO2@MOF异质结构的光催化剂仍然是一个巨大的挑战。
发明内容
本发明选择丹宁酸作为定向保护剂,然后通过水解方法从内向外蚀刻NH2-MIL-125 (Ti),最终获得了具有{100}面裸露的的TiO2@MOF空心框架结构。这项工作采用定向化学保护和原位自牺牲水解刻蚀的方法制备这种具有空心框架形貌TiO2@MOF异质结构复合纳米材料。且所制备的光催化剂TiO2@MOF比纯的TiO2和纯的MOF有更高的光催化活性。
具体而言,本发明提供了一种具有空心框架形貌TiO2@MOF异质结光催化剂的制备方法,包括以下步骤:
S1:将钛酸四异丙酯和2-氨基对苯二甲酸溶解在有机溶剂中后转移至反应釜中加热反应一段时间,反应结束后,离心收集产物,清洗,干燥得到具有方块状结构的NH2-MIL-125 前驱物;
S2:将NH2-MIL-125前驱物和丹宁酸溶解在水溶液中得混合溶液,将混合溶液转移至反应釜中,加热反应一段时间,反应结束后,离心收集产物,清洗,干燥,得具有空心框架形貌TiO2@MOF异质结光催化剂。
进一步的,所述有机溶剂是体积比为7:5的N,N-二甲基甲酰胺与甲醇溶液中的混合液。
进一步的,所述步骤S1中,加热温度为150℃,反应时间为24h。
进一步的,所述步骤S2中,NH2-MIL-125前驱物与丹宁酸的质量比为1:2。
进一步的,所述步骤S2中加热温度是150℃,反应时间是60min。
本发明还提供了由上述方法制备的具有空心框架形貌TiO2@MOF异质结光催化剂。
与现有技术相比,本发明的有益效果:
本发明选择丹宁酸作为定向保护剂,然后通过水解方法从内向外蚀刻NH2-MIL-125 (Ti),最终获得了具有{100}面裸露的的TiO2@MOF空心框架结构。本发明采用定向化学保护和原位自牺牲水解刻蚀的方法制备具有空心框架形貌TiO2@MOF异质结构复合纳米材料,所制备的光催化剂TiO2@MOF比纯的TiO2和纯的MOF有更高的光催化活性。
附图说明
图1是本发明实施例所制备NH2-MIL-125前驱物的X射线粉末衍射图(a)和 NH2-MIL-125前驱物的扫描电镜图(b);
图2是本发明实施例所制备TiO2@MOF的扫描电镜图(a)和元素分布图(b-f),a中插图为500nm尺度下的TiO2@MOF扫描电镜图;
图3本发明实施例所制备TiO2@MOF异质结构的X射线粉末衍射图;
图4中,a是本发明实施例所制备的TiO2@MOF异质结构的透射图;
b是从图a的区域1中观察到的TiO2@MOF的HRTEM图像,其中,插图是对应的电子衍射图;
c是从图a的区域2中观察到的TiO2@MOF的HRTEM图像,其中,插图是对应的电子衍射图;
图5是在模拟阳光照射下,TiO2@MOF,TiO2,MOF的光解水产氢速率图(300W Xelamp,AM 1.5G)。
具体实施方式:
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
实施例
第一步:合成NH2-MIL-125前驱物
取75μL钛酸四异丙酯(TIPT)和70mg 2-氨基对苯二甲酸溶解在10mL N,N-二甲基甲酰胺和甲醇体积比为7:5的溶液中的混合溶液中,将上述混合溶液转移至25mL聚四氟乙烯高压应釜中加热至加热至150℃,反应时间24h。反应结束后,通过离心收集产物,用无水乙醇清洗产物数次,置于干燥箱中烘干即可得到具有方块状结构的NH2-MIL-125前驱物(图1)。
第二步:合成TiO2@MOF异质结复合材料。
取NH2-MIL-125前驱物(10mg)和丹宁酸(20mg)溶解在10mL水溶液中,将上述混合溶液转移至聚四氟乙烯高压应釜中,加热至目标反应温度(150℃)和所需反应时间(60min)。反应结束后,通过离心收集产物,用无水乙醇和去离子水清洗产物数次,置于干燥箱中烘干即可得到均匀的具有空心框架形貌TiO2@MOF异质结复合材料。图2a是本发明实施例所制备TiO2@MOF的扫描电镜图(SEM),图2(b-f)是TiO2@MOF元素分布图(EDX)。图3所示是TiO2@MOF异质结构的X射线粉末衍射图(XRD)。图4a是TiO2@MOF异质结构的透射图(TEM)。4b是从图4a的区域1中观察到的TiO2@MOF的HRTEM图像,插图:对应的电子衍射图(SEAD)。4c是从图4a的区域2中观察到的TiO2@MOF的HRTEM 图像,插图:对应的电子衍射图(SEAD)。图5是在模拟阳光照射下,制备的TiO2@MOF 与TiO2、MOF的光解水产氢速率图对比图(300W Xelamp,AM 1.5G),从图5中可以看出,光催化剂TiO2@MOF比纯的TiO2和纯的MOF有更高的光催化活性。
Claims (6)
1.一种具有空心框架形貌TiO2@MOF异质结光催化剂的制备方法,其特征在于,包括以下步骤:
S1:将钛酸四异丙酯和2-氨基对苯二甲酸溶解在有机溶剂中后转移至反应釜中加热反应一段时间,反应结束后,离心收集产物,清洗,干燥得到具有方块状结构的NH2-MIL-125前驱物;
S2:将NH2-MIL-125前驱物和丹宁酸溶解在水溶液中得混合溶液,将混合溶液转移至反应釜中,加热反应一段时间,反应结束后,离心收集产物,清洗,干燥,得具有空心框架形貌TiO2@MOF异质结光催化剂。
2.根据权利要求1所述的方法,其特征在于,所述有机溶剂是体积比为7:5的N,N-二甲基甲酰胺与甲醇的混合液。
3.根据权利要求1所述的方法,其特征在于,所述步骤S1中,加热温度为150℃,反应时间为24 h。
4.根据权利要求1所述的方法,其特征在于,所述步骤S2中,NH2-MIL-125前驱物与丹宁酸的质量比为1:2。
5.根据权利要求1所述的方法,其特征在于,所述步骤S2中,加热温度是150℃,反应时间是60 min。
6.由上述任一权利要求所述方法制备的具有空心框架形貌TiO2@MOF异质结光催化剂。
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