阅读说明：本技术 一种对亚甲基蓝光降解的新型光催化剂材料及其制备方法 (Novel photocatalyst material for degrading methylene blue light and preparation method thereof ) 是由 燕红 郭改娟 于 2019-09-11 设计创作，主要内容包括：一种对亚甲基蓝光降解的新型光催化剂材料及其制备方法,涉及新型光催化剂材料的制备及其对亚甲基蓝的光降解。本发明公开了一种新型光催化剂材料制备方法,在搅拌条件下将去离子水与乙二醇按一定体积比混合形成均匀混合溶剂,然后将一定量的硝酸铋、硝酸锌和尿素先后溶于此混合溶剂中,之后将该体系转移到反应釜中,放于烘箱中,于一定温度下反应一段时间,自然冷却到室温,将所得沉淀分别用去离子水与无水乙醇洗涤离心分离,置于烘箱内干燥,即可得到新型Zn掺杂Bi<Sub>2</Sub>O<Sub>2</Sub>CO<Sub>3</Sub>光催化剂材料。该制备过程简单有效、成本低、产率高,且能有效解决Bi<Sub>2</Sub>O<Sub>2</Sub>CO<Sub>3</Sub>对亚甲基蓝光降解效率低的问题。本发明应用于光降解染料领域,实验表明新型光催化剂的光降解效率可达86.25%。(A novel photocatalyst material for degrading methylene blue light and a preparation method thereof relate to the preparation of the novel photocatalyst material and the photodegradation of methylene blue light. The invention discloses a preparation method of a novel photocatalyst material, which comprises the steps of mixing deionized water and ethylene glycol according to a certain volume ratio under the condition of stirring to form a uniform mixed solvent, then dissolving a certain amount of bismuth nitrate, zinc nitrate and urea in the mixed solvent in sequence, transferring the system to a reaction kettle, placing the system in an oven, reacting for a period of time at a certain temperature, naturally cooling to room temperature, washing and centrifugally separating obtained precipitates with the deionized water and absolute ethyl alcohol respectively, and placing the precipitates in the oven for drying to obtain a novel Zn-doped Bi 2 O 2 CO 3 A photocatalyst material. The preparation process is simple and effective, has low cost and high yield, and can effectively solve Bi 2 O 2 CO 3 The degradation efficiency to methylene blue light is low. The invention is applied to the field of photodegradation dyes, and experiments show that the light of the novel photocatalyst is degradedThe solution efficiency can reach 86.25%.)

1. Zn-doped Bi₂O₂CO₃The preparation of the photocatalyst material is characterized in that the method comprises the following steps:

(1) Mixing deionized water and ethylene glycol according to a certain volume ratio under the condition of stirring to form a uniform mixed solvent;

(2) Sequentially dissolving a certain amount of bismuth nitrate, zinc nitrate and urea in the mixed solvent obtained in the step (1) under the condition of stirring to form a clear solution;

(3) And (3) transferring the reaction system obtained in the step (2) into a reaction kettle, placing the reaction system into an oven, reacting for a period of time at a certain temperature, naturally cooling to room temperature, washing with deionized water and absolute ethyl alcohol for three times respectively, centrifugally separating, and drying to obtain the product.

2. the Zn-doped Bi according to claim 1₂O₂CO₃The preparation method of the photocatalyst material is characterized by comprising the following steps: in the step (1), deionized water and ethylene glycol are used as a mixed solvent, and the volume ratio of the deionized water to the ethylene glycol is 1: 4.

3. the Zn-doped Bi according to claim 1₂O₂CO₃The preparation method of the photocatalyst material is characterized by comprising the following steps: the molar ratio of the zinc nitrate to the bismuth nitrate in the step (2) is 0:1 and 0.5: 1.

4. the Zn-doped Bi according to claim 1₂O₂CO₃the preparation method of the photocatalyst material is characterized by comprising the following steps: the adding amount of the urea in the step (2) is 0.6 g.

5. The Zn-doped Bi according to claim 1₂O₂CO₃the preparation method of the photocatalyst material is characterized by comprising the following steps: the reaction conditions in the step (3) are as follows: the reaction is carried out for 12h at 120 ℃.

6. The Zn-doped Bi according to claim 1₂O₂CO₃The preparation method of the photocatalyst material is characterized by comprising the following steps: the drying conditions in the step (3) are as follows: drying at 80 deg.C for 2 h.

7. The Zn-doped Bi according to claim 1₂O₂CO₃The preparation method of the photocatalyst material is used for preparing the photocatalyst and degrading methylene blue through photocatalysis.

Technical Field

The invention relates to a novel photocatalyst material for degrading methylene blue light and a preparation method thereof.

background

In the long-term development of human society, environmental pollution not only threatens public health, but also is a main problem facing water quality safety in China. In the production activities of people, such as leather making, spinning, printing and dyeing, plastic processing and other industries, a large amount of industrial wastewater with organic dyes (such as methylene blue) can be generated, so that water pollution is caused, and animal and plant genes in water are mutated; in human beings, even at very low concentrations, the health and safety of human beings are greatly threatened, such as human body distortion, gene mutation, cancer and the like. Therefore, many techniques for removing contaminants from water have been discovered to treat environmental pollution problems, such as chemical precipitation, ion exchange, biological treatment, adsorption, and photocatalytic degradation. Among them, for photocatalytic degradation, a high-efficiency photocatalyst is effective for removing organic pollutants in water, and has been widely noticed due to its low cost and high efficiency. Therefore, the development of efficient visible light-driven photocatalytic degradation catalyst is a unique driving force in the field of photocatalytic degradation.

Since the discovery of the use of TiO₂TiO from the photocatalytic decomposition of water by single crystal electrodes to produce hydrogen and oxygen₂Is the most widely studied photocatalyst and is therefore made of TiO₂Various studies of the underlying photocatalysts have been reported. But developed to have high efficiency and not TiO₂The visible light photocatalytic performance of the catalyst is another method for solving the problem of environmental pollution. Therefore, the bismuth-based nano material has attracted extensive attention in the field of photochemistry due to the advantages of small narrow band gap, no toxicity, low cost, high activity and the like. Sillen-like bismuth oxycarbonate (Bi) composite oxide having layered structure₂O₂CO₃) The organic light-emitting diode has a unique electronic structure, strong visible light absorption capacity and high degradation capacity on organic matters, so that the organic light-emitting diode is widely concerned by researchers. However, Bi₂O₂CO₃The relatively wide band gap (-3.1-3.5 eV) results in low utilization of visible light. There are therefore many ways to improve Bi₂O₂CO₃Visible light response of the photocatalyst, such as heterojunction coupling, doping, and surface modification, etc. Wherein, in the element doping method, the N-doped Bi₂O₂CO₃i doped Bi₂O₂CO₃Bi doped with Fe₂O₂CO₃And by surface loading and La³⁺Bulk doped Bi₂O₂CO₃all have good visible light photocatalytic activity. However, one dopes Bi to the metal₂O₂CO₃The knowledge in the field of photocatalysts is not yet extensive, and therefore, the design and research of metal-doped Bi₂O₂CO₃The photocatalyst has important significance. Therefore, the invention designs and researchesNovel Zn-doped Bi with efficient photocatalytic activity on methylene blue₂O₂CO₃The photodegradation of the photocatalyst on methylene blue reaches 86.25 percent, and the photocatalyst is prepared from the single Bi₂O₂CO₃Compared with the prior art, the improvement is improved by 3 times.

disclosure of Invention

The purpose of the present invention is to effectively increase Bi₂O₂CO₃The problem of low photodegradation efficiency of methylene blue is solved, and a Zn-doped Bi is provided₂O₂CO₃The novel photocatalyst material and the preparation method thereof. The method has simple and effective preparation process, low reagent consumption and high yield.

The invention provides a novel Zn-doped Bi₂O₂CO₃The preparation method of the photocatalyst material is carried out according to the following steps:

(1) Mixing deionized water and ethylene glycol according to a certain volume ratio under the condition of stirring to form a uniform mixed solvent;

The volume ratio of the deionized water to the ethylene glycol in the step (1) is 1: 4.

(2) Sequentially dissolving a certain amount of zinc nitrate, bismuth nitrate and urea in the mixed solvent obtained in the step (1) under the condition of stirring to form a clear solution;

The molar ratio of the zinc nitrate to the bismuth nitrate in the step (2) is 0:1 and 0.5: 1;

The amount of urea added in step (2) was 0.6 g.

(3) Transferring the reaction system obtained in the step (2) into a reaction kettle, placing the reaction system in an oven, reacting for a period of time at a certain temperature, naturally cooling to room temperature, washing with deionized water and absolute ethyl alcohol respectively for three times, centrifugally separating, and drying to obtain a product;

The mixed heat reaction conditions in the step (3) are as follows: reacting for 12 hours at 120 ℃;

The drying conditions in the step (3) are as follows: drying at 80 ℃ for 2 h.

The invention has the beneficial effects that:

The invention adopts a mixed solvent thermal method to prepare zinc nitrate and nitric acidBismuth and urea are used as raw materials to successfully synthesize Zn-doped Bi₂O₂CO₃the method has the advantages of simple and effective preparation process, low reagent consumption and high yield.

Drawings

FIG. 1 is a Fourier infrared spectrum of the prepared material.

FIG. 2 is an X-ray powder diffraction pattern of the prepared material.

FIG. 3 is a photo-degradation graph of the prepared material for methylene blue.

Detailed Description

The invention is further illustrated by the following examples, which are merely illustrative of the process of the invention and are not intended to limit the scope of the invention in any way.