一维纳米三氧化钼的制备及其光催化性能研究

发布时间：2018-02-02 07:57

  本文关键词： 微波辅助超声合成法 纳米三氧化钼 制备 复合 光催化　出处：《广西大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着全球工业化进程的发展,废水排放量居高不下,如何合理高效的处理废水已引起社会的广泛关注。利用光催化降解处理废水是目前最有效的解决办法之一。三氧化钼(MoO_3)因具有比表面积大以及电子沿轴传输等特点现已成为光催化领域的新兴研究对象,但由于MoO_3的禁带宽度较大,致使其光催化降解能力有限。氧化石墨烯(GO)具有比表面能高、亲水性好以及能够有效改善材料的光催化性能等特点。为了提高MoO_3的光催化降解性能,本论文采用传统沉淀法以及微波辅助超声合成法制备一维纳米MoO_3,并通过添加GO来改善MoO_3的光催化降解性能。在用两种不同方法制备MoO_3的过程中分别考察了硝酸添加量、反应温度、反应时间等工艺参数。通过XRD、TEM、DRS等表征手段比较了不同制备方法所得MoO_3在形貌,结构以及光催化性能等方面的差异。结果如下:(1)采用沉淀法制备MoO_3,在VHNO_3:VH_2O=4:1,反应温度70℃,反应时间1.5 h时,可以制备出光催化性能较好的h-MoO_3,其对罗丹明B的降解率可达到94.2%。(2)采用微波辅助超声合成法制备MoO_3,在超声功率400 W,微波功率75W,VHNO_3:VH_2O=1:1,反应温度90℃,反应时间1.5h时,可制备出光催化性能较好的的α-MoO_3,其对罗丹明B的降解率可达96%。通过对上述两种方法的比较,选用微波辅助超声合成法原位合成GO@MoO_3,工艺条件与该法合成制备α-MoO_3 一致,在石墨烯添加量为5%,复合时间为3.5 h的条件下,可制备出光催化性能良好的GO@MoO_3复合产物。通过XRD、TEM、DRS等表征GO@MoO_3的形貌,结构,其对罗丹明B的降解率可达100%。
[Abstract]:With the development of the global industrialization process, the discharge of wastewater remains high. How to treat wastewater reasonably and efficiently has aroused widespread concern in society. Photocatalytic degradation of wastewater is one of the most effective solutions at present. Because of its large specific surface area and electron transmission along the axis, it has become a new research object in the field of photocatalysis. However, the photocatalytic degradation ability of MoO_3 is limited because of its wide band gap. The graphene oxide (GOO) has high surface energy. In order to improve the photocatalytic degradation of MoO_3, the hydrophilic properties and photocatalytic properties of the materials can be improved effectively. In this thesis, one-dimensional nano-scale MoO_3 was prepared by traditional precipitation method and microwave-assisted ultrasonic synthesis method. The photocatalytic degradation of MoO_3 was improved by adding go. The amount of nitric acid and the reaction temperature were investigated during the preparation of MoO_3 by two different methods. The morphologies of MoO_3 obtained by different preparation methods were compared by means of XRDX Tem DRS and other process parameters such as reaction time. The differences in structure and photocatalytic properties are as follows: 1) Moo _ s _ 3 was prepared by precipitation method, and the reaction temperature was 70 鈩，

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