CN107096561A - 一种Pt/NH4TiOF3多孔沙琪玛结构光催化剂及其制备方法 - Google Patents
一种Pt/NH4TiOF3多孔沙琪玛结构光催化剂及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种Pt/NH4TiOF3多孔沙琪玛结构光催化剂及其制备方法。其特征在于,所述Pt/NH4TiOF3光催化剂具有多孔沙琪玛结构,由一步溶剂热反应制备。将氟化铵、硫酸钛和氯铂酸溶于一缩二丙二醇和醋酸中得到混合溶液,在内衬聚四氟乙烯的高压反应釜中进行水热反应。反应结束后,将所得产物离心洗涤并干燥,得到Pt/NH4TiOF3多孔沙琪玛结构。本发明所述方法采用一步反应完成,工艺简单,制备成本低;该方法所制备的Pt/NH4TiOF3多孔沙琪玛结构比表面积高、Pt的分散性容易控制。对光催化分解水制氢具有很好的光催化活性。对水溶液中有机染料也具有很好的光催化降解性能。
Description
技术领域
本发明属于光催化剂材料领域,涉及一种Pt/NH4TiOF3光催化剂及其制备方法,具体地说,是涉及一种Pt/NH4TiOF3多孔沙琪玛结构光催化剂及其制备方法。
背景技术
Pt是一种传统的催化材料,具有优异的物理和化学性能,在电催化,光催化,太阳能电池等领域都有广泛的应用。但作为贵金属,Pt资源稀少,价格昂贵,而且有关稳定性、抗硫性能等问题也亟待解决,这些问题限制了贵金属Pt催化剂的应用。而且随着研究的深入,人们发现纳米尺寸的催化剂颗粒在实际应用中难以操作,而且由于纳米催化剂颗粒小、比表面积大、热力学不稳定,在使用过程或热处理中易于团聚凝结使颗粒长大,可导致分散度下降,活性降低。为了提高纳米催化剂的分散稳定性和实用性,将贵金属于其它材料复合,能有效促进光生载流子的分离,抑制光生电子空穴对的复合,提髙光催化活性。同时可以提高铂的利用率,减少贵金属的用量,降低使用成本。氟氧钛酸铵是一种半导体材料,其表面存在很多孔洞,使其孔隙率很大,有利于光催化作用。将Pt与氟氧钛酸铵复合,可以有效地控制半导体能级和物理性质,由于金属铂高效的分散在氟氧钛酸铵的表面,因此需要很少量的铂即可捕获光生电子,抑制光生电子空穴对的复合,提高了铂的利用率和光催化活性。
中国发明专利CN201410015903.7和CN201410252180.2分别公开了一种三氟氧钛酸铵的制备方法。通过显露{001}晶面的三氟氧钛酸铵的拓扑转化反应可以得到TiO2,并使{001}晶面很好的保留下来,其{001}晶面的显露呈现更高的光催化活性。目前,尚未提供一步法制备 Pt/NH4TiOF3多孔沙琪玛结构光催化剂及其制备方法。
发明内容
本发明所要解决的技术问题是针对现有技术中存在的问题,提供一种Pt/NH4TiOF3多孔沙琪玛结构光催化剂及其制备方法。该方法工艺简单,反应条件较温和,所制备出的Pt/NH4TiOF3多孔沙琪玛结构比表面积大、多孔孔径和Pt的分散性容易控制,本发明采用以下技术方案予以实现:
一种Pt/NH4TiOF3多孔沙琪玛结构光催化剂及其制备方法。其特征在于,所述一种Pt/NH4TiOF3多孔沙琪玛结构光催化剂由一步溶剂热反应制备,所述方法包括下述步骤:
(1)取1-2ml一缩二丙二醇溶于水,依次加入25-30ml醋酸,0.2-0.5g氟化铵,0.12-36 g硫酸钛,2-20mg氯铂酸得到混合溶液;
(2)将步骤(1)所得混合液转移到内衬为聚四氟乙烯的高压反应釜中,在120-180℃恒温反应3-12h;
(3)将步骤(2)所得反应液自然冷却到室温,离心,分别用去离子水和乙醇重复洗涤二遍,获得到Pt/NH4TiOF3沉淀物;
(4)将步骤(3)中获得的沉淀物放入60-80℃干燥箱中干燥,得到Pt/NH4TiOF3多孔沙琪玛结构光催化剂。
本发明的优点在于:采用一步反应完成,工艺简单,制备成本低;该方法所制备的Pt/NH4TiOF3多孔沙琪玛结构比表面积高、多孔孔径和Pt的分散性容易控制。
附图说明
图1为实施例一所制备的Pt/NH4TiOF3多孔沙琪玛结构样品的XRD谱图。
图2为实施例一所制备的Pt/NH4TiOF3多孔沙琪玛结构样品的SEM照片。
图3为实施例一所制备的Pt/NH4TiOF3多孔沙琪玛结构样品和对比例所制备的NH4TiOF3样品光解水制氢速率图。
具体实施方式
下面通过实施例对本发明作进一步详细说明:
实施例一:
(1)取1ml一缩二丙二醇,依次加入30ml醋酸,0.4g氟化铵,0.24g硫酸钛,4mg氯铂酸得到混合溶液;
(2)将步骤(1)所得混合液转移到内衬为聚四氟乙烯的高压反应釜中,在180℃恒温反应 8h;
(3)将步骤(2)所得反应液自然冷却到室温,离心,分别用去离子水和乙醇重复洗涤二遍,获得到Pt/NH4TiOF3沉淀物;
(4)将步骤(3)中获得的沉淀物放入70℃干燥箱中干燥,得到Pt/NH4TiOF3多孔沙琪玛结构光催化剂。
实施例二:
(1)取1ml一缩二丙二醇,依次加入30ml醋酸,0.4g氟化铵,0.24g硫酸钛,2mg 氯铂酸得到混合溶液;
(2)将步骤(1)所得混合液转移到内衬为聚四氟乙烯的高压反应釜中,在180℃恒温反应8h;
(3)将步骤(2)所得反应液自然冷却到室温,离心,分别用去离子水和乙醇重复洗涤二遍,获得到Pt/NH4TiOF3沉淀物;
(4)将步骤(3)中获得的沉淀物放入70℃干燥箱中干燥,得到Pt/NH4TiOF3多孔沙琪玛结构光催化剂。
实施例三:
(1)取1ml一缩二丙二醇,依次加入30ml醋酸,0.4g氟化铵,0.24g硫酸钛,8mg 氯铂酸得到混合溶液;
(2)将步骤(1)所得混合液转移到内衬为聚四氟乙烯的高压反应釜中,在180℃恒温反应8h;
(3)将步骤(2)所得反应液自然冷却到室温,离心,分别用去离子水和乙醇重复洗涤二遍,获得到Pt/NH4TiOF3沉淀物;
(4)将步骤(3)中获得的沉淀物放入70℃干燥箱中干燥,得到Pt/NH4TiOF3多孔沙琪玛结构光催化剂。
实施例四:
1)取2ml一缩二丙二醇,依次加入30ml醋酸,0.2g氟化铵,0.24g硫酸钛,4mg 氯铂酸得到混合溶液;
(2)将步骤(1)所得混合液转移到内衬为聚四氟乙烯的高压反应釜中,在150℃恒温反应6h;
(3)将步骤(2)所得反应液自然冷却到室温,离心,分别用去离子水和乙醇重复洗涤二遍,获得到Pt/NH4TiOF3沉淀物;
(4)将步骤(3)中获得的沉淀物放入60℃干燥箱中干燥,得到Pt/NH4TiOF3多孔沙琪玛结构光催化剂。
实施例五:
(1)取2ml一缩二丙二醇,依次加入30ml醋酸,0.4g氟化铵,0.24g硫酸钛,8mg 氯铂酸得到混合溶液;
(2)将步骤(1)所得混合液转移到内衬为聚四氟乙烯的高压反应釜中,在120℃恒温反应12h;
(3)将步骤(2)所得反应液自然冷却到室温,离心,分别用去离子水和乙醇重复洗涤二遍,获得到Pt/NH4TiOF3沉淀物;
(4)将步骤(3)中获得的沉淀物放入60℃干燥箱中干燥,得到Pt/NH4TiOF3多孔沙琪玛结构光催化剂。
对比例:
(1)取1ml一缩二丙二醇,依次加入30ml醋酸,0.4g氟化铵,0.24g硫酸钛溶解得到混合溶液;
(2)将步骤(1)所得混合液转移到内衬为聚四氟乙烯的高压反应釜中,在180℃恒温反应8h;
(3)将步骤(2)所得反应液自然冷却到室温,离心,分别用去离子水和乙醇重复洗涤二遍,获得到NH4TiOF3沉淀物;
(4)将步骤(3)中获得的沉淀物放入70℃干燥箱中干燥,得到NH4TiOF3多孔沙琪玛结构光催化剂。
图1为利用本发明实施例一所述方法制备的Pt/NH4TiOF3多孔沙琪玛结构样品的XRD谱图。由图可以看出,根据卡片54-239的标准衍射,其衍射峰可以指标化为NH4TiOF3的衍射峰。
样品的形貌和微结构分析在JSM-6700F场发射扫描电子显微镜(SEM)上进行。图2为利用本发明实施例一所述方法制备样品的SEM照片。从图中的照片可以看出,所制备的Pt/NH4TiOF3样品呈现多孔沙琪玛结构,样品颗粒呈单分散状态。
图3为利用本发明实施例一所述方法制备的Pt/NH4TiOF3多孔沙琪玛结构样品和对比例所述方法制备NH4TiOF3样品的光催化产氢速率对比图。由图可以看出,所得到的Pt/NH4TiOF3多孔沙琪玛结构光催化剂的产氢率远远地高于对比例所述方法制备NH4TiOF3纳米结构,高达420μmol·h-1·g-1。表明多孔沙琪玛结构的Pt/NH4TiOF3可以作为光解水制氢的高效光催化剂。
实验结果表明,通过一步溶剂热反应,可以得到Pt/NH4TiOF3多孔沙琪玛结构,该沙琪玛结构的孔径大小和贵金属Pt的分散性易于控制。也可以用于废水中有机染料的光催化降解去除,实验结果表明,本发明制备的多孔沙琪玛结构Pt/NH4TiOF3光催化剂对废水中有机染料即具有很好的吸附作用,又具有很好的光催化降解性能。
上述实施例是本发明较佳的实施方式,但本发明的实施方式并不受上述实施例的限制,未背离本发明的原理与工艺过程下所作的其它任何改变、替代、简化等,均为等效的置换,都应包含在本发明的保护范围之内。
Claims (1)
1.一种Pt/NH4TiOF3多孔沙琪玛结构光催化剂及其制备方法。其特征在于,所述Pt/NH4TiOF3光催化剂具有多孔沙琪玛结构,由一步溶剂热反应制备,所述制备方法包括下述步骤:
(1)取1-2ml一缩二丙二醇溶于水,依次加入25-30ml醋酸,0.2-0.5g氟化铵,0.12-36g硫酸钛,2-20mg氯铂酸得到混合溶液;
(2)将步骤(1)所得混合液转移到内衬为聚四氟乙烯的高压反应釜中,在120-180℃恒温反应3-12h;
(3)将步骤(2)所得反应液自然冷却到室温,离心,分别用去离子水和乙醇重复洗涤二遍,获得到Pt/NH4TiOF3沉淀物;
(4)将步骤(3)中获得的沉淀物放入60-80℃干燥箱中干燥,得到Pt/NH4TiOF3多孔多孔沙琪玛结构光催化剂。
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