阅读说明：本技术 一种碘氧化铋/纳米金刚石复合光催化剂及其制备方法 (Bismuth oxyiodide/nano-diamond composite photocatalyst and preparation method thereof ) 是由 苏丽霞 郝好山 陈铃 薛丽沙 王文闯 商继芳 于 2020-08-25 设计创作，主要内容包括：本发明公开了一种碘氧化铋/纳米金刚石复合光催化剂及其制备方法。首先对纳米金刚石进行提纯以及分散,然后与碘氧化铋的前驱体(陆续加入乙二醇,Bi(NO<Sub>3</Sub>)<Sub>3</Sub>·5H<Sub>2</Sub>O,KI,去离子水)充分混合,通过一步水热法合成碘氧化铋/纳米金刚石复合光催化剂。本发明合成的复合光催化剂具有光稳定性好、光生载流子利用率高。复合光催化剂增强了碘氧化铋的光催化活性,解决了碘氧化铋光生载流子易复合的问题,该合成方法简单易行,成本低廉,有利于大规模生产。(The invention discloses a bismuth oxyiodide/nano-diamond composite photocatalyst and a preparation method thereof. Firstly, the nano-diamond is purified and dispersed, and then the nano-diamond is mixed with a precursor of bismuth oxyiodide (ethylene glycol, Bi (NO) are added in sequence) 3 ) 3 ·5H 2 O, KI and deionized water) and synthesizing the bismuth oxyiodide/nano-diamond composite photocatalyst by a one-step hydrothermal method. The composite photocatalyst synthesized by the invention has good photostability and high utilization rate of photon-generated carriers. The composite photocatalyst enhances the photocatalytic activity of bismuth oxyiodide, solves the problem that bismuth oxyiodide photon-generated carriers are easy to compound, has simple and easy synthesis method and low cost, and is beneficial to large-scale production.)

1. A preparation method of a bismuth oxyiodide/nano-diamond composite photocatalyst is characterized by comprisingThe method comprises the following steps: purifying and dispersing the nano-diamond, adding the nano-diamond into a beaker, and then adding ethylene glycol and Bi (NO)₃)₃•5H₂O, KI and deionized water, transferring the obtained mixed solution into a high-pressure reaction kettle, heating, cooling, centrifuging, purifying and drying to obtain the bismuth oxyiodide/nano-diamond composite photocatalyst.

2. The method for preparing the bismuth oxyiodide/nano-diamond composite photocatalyst according to claim 1, wherein the method comprises the following steps: the Bi (NO)₃)₃•5H₂And reacting O with KI to generate bismuth oxyiodide.

3. The method for preparing the bismuth oxyiodide/nanodiamond composite photocatalyst according to claim 2, wherein the method comprises the following steps: the mass percentage of the nano diamond and the bismuth oxyiodide is 8-32%.

4. The method for preparing the bismuth oxyiodide/nano-diamond composite photocatalyst according to claim 1, wherein the method comprises the following steps: the Bi (NO)₃)₃•5H₂The molar ratio of O to KI is 1: 1.

5. The method for preparing the bismuth oxyiodide/nano-diamond composite photocatalyst according to claim 1, wherein the method comprises the following steps: the volume ratio of the ethylene glycol to the deionized water is 1: 1.

6. The method for preparing the bismuth oxyiodide/nano-diamond composite photocatalyst according to claim 1, wherein the method comprises the following steps: the heating temperature is 160-200 ℃, and the heat preservation is carried out for 10-16 h.

7. The method for preparing the bismuth oxyiodide/nano-diamond composite photocatalyst according to claim 1, wherein the method comprises the following steps: the drying is carried out in a drying oven at the temperature of 60-80 ℃ for 12 hours.

8. The bismuth oxyiodide/nanodiamond composite photocatalyst prepared by the preparation method according to any one of claims 1 to 7.

Technical Field

The invention belongs to the technical field of composite material photocatalysis, and particularly relates to a bismuth oxyiodide/nano-diamond composite photocatalyst and a preparation method thereof.

Background

Energy crisis and environmental pollution are two important problems facing the sustainable development path of the society today. The method for solving the two problems with low cost and high efficiency has profound practical significance. The photocatalysis technology is a technology which takes continuous solar energy as a power source by means of semiconductor materials, can convert the solar energy into clean energy such as hydrogen energy and the like on one hand, and can decompose organic pollutants into water, carbon dioxide and other small molecules without secondary pollution on the other hand. Therefore, photocatalytic technology is favored by many researchers.

Bismuth oxyiodide is a p-type semiconductor with a layered structure, has a relatively small band gap of about 1.65eV, has good absorption on visible light and good response capability on sunlight, and therefore, the bismuth oxyiodide-based photocatalyst has a good application prospect in pollution control. As a novel carbon nanomaterial, nanodiamond has attracted more and more attention in the field of photocatalysis due to its characteristics of large specific surface area, low cost, mass production, environmental friendliness, and the like.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a bismuth oxyiodide/nano-diamond composite photocatalyst and a preparation method thereof. The composite photocatalyst enhances the photocatalytic activity of bismuth oxyiodide, solves the problem that bismuth oxyiodide photon-generated carriers are easy to compound, has simple and easy synthesis method and low cost, and is beneficial to large-scale production.

In order to solve the technical problems, the invention adopts the following technical scheme:

a preparation method of a bismuth oxyiodide/nano-diamond composite photocatalyst comprises the following steps: purifying and dispersing the nano-diamond, adding the nano-diamond into a beaker, and then adding ethylene glycol and Bi (NO)₃)₃•5H₂O, KI and dissociationAnd transferring the obtained mixed solution into a high-pressure reaction kettle, heating, cooling, centrifuging, purifying and drying to obtain the bismuth oxyiodide/nano-diamond composite photocatalyst.

Further, said Bi (NO)₃)₃•5H₂And reacting O with KI to generate bismuth oxyiodide.

Further, the mass percentage of the nano-diamond and the bismuth oxyiodide is 8-32%, and the preferable mass percentage is 16%.

Further, said Bi (NO)₃)₃•5H₂The molar ratio of O to KI is 1: 1.

Further, the volume ratio of the ethylene glycol to the deionized water is 1: 1.

Further, the heating temperature is 160-.

Further, the drying is carried out in a drying oven at 60-80 ℃, preferably at 60 ℃ for 12 hours.

The bismuth oxyiodide/nano-diamond composite photocatalyst prepared by the preparation method is provided.

The invention has the beneficial effects that: nanodiamond is a wide bandgap (optical bandgap <3.5eV, tunable by surface defects) n-type semiconductor with weak response to visible light. After the nano diamond is combined with bismuth oxyiodide, the separation of photon-generated carriers can be promoted, the photon utilization rate is improved, and the photocatalytic activity of the nano diamond is obviously improved. The two different types of semiconductors are combined to construct a p-n type heterojunction composite photocatalyst, a built-in electric field formed at an interface can promote the separation of photon-generated carriers, meanwhile, rich defects on the surface of the nano diamond can provide active sites for photocatalytic reaction, and the catalytic activity of bismuth oxyiodide is further improved.

Drawings

FIG. 1 is an electron scanning electron micrograph and elemental analysis of a sample: (a) bismuth oxyiodide, (b) bismuth oxyiodide/nanodiamond; (c) is the corresponding element analysis energy spectrogram marked by the (b) '+' word.

Fig. 2 is an ultraviolet-visible light absorption spectrum of the sample.

Fig. 3 is a photocatalytic activity test chart.

FIG. 4 is a cycle experimental curve of photo-degradation of rhodamine B by bismuth oxyiodide/nano-diamond.

Detailed Description

The present invention will be further described with reference to the following examples. It is to be understood that the following examples are illustrative only and are not intended to limit the scope of the invention, which is to be given numerous insubstantial modifications and adaptations by those skilled in the art based on the teachings set forth above.