阅读说明：本技术 一种磁性含铋的氧化铁光催化剂的低温制备方法 (Low-temperature preparation method of magnetic bismuth-containing iron oxide photocatalyst ) 是由 李晓约 金鑫鑫 于 2019-10-25 设计创作，主要内容包括：一种磁性含铋的氧化铁光催化剂的低温制备方法,属于磁性光催化剂材料制备技术领域。本发明为了解决现有有含铋光催化剂的回收利用问题。本发明直接利用溶剂热法使用Bi(NO<Sub>3</Sub>)<Sub>3</Sub>溶液、Fe(NO<Sub>3</Sub>)<Sub>3</Sub>溶液和NaBH<Sub>4</Sub>溶液以及NaOH水溶液制备磁性含铋的氧化铁光催化剂。本发明的制备方法将具有光催化作用的铋与氧化铁复合具有磁性,使得该光催化剂可以在外加电场的作用下进行回收,可循环使用,在对环境友好的同时降低了成本。并且本发明的制备方法具有制备时间短,制备温度相对较低的优点,节约了制备成本。并且本发明制得的光催化剂微观结构均匀,具有良好的光催化稳定性和较高的磁导率。(A low-temperature preparation method of a magnetic bismuth-containing iron oxide photocatalyst belongs to the technical field of preparation of magnetic photocatalyst materials. The invention aims to solve the problem of recycling of the existing bismuth-containing photocatalyst. The invention directly uses Bi (NO) by a solvothermal method 3 ) 3 Solution, Fe (NO) 3 ) 3 Solution and NaBH 4 The solution and NaOH aqueous solution are used for preparing the magnetic bismuth-containing iron oxide photocatalyst. The preparation method compounds bismuth and ferric oxide with photocatalysis effect to have magnetism, so that the photocatalyst can be recycled under the action of an external electric field, can be recycled, is environment-friendly and reduces the cost. The preparation method has the advantages of short preparation time and relatively low preparation temperature, and saves the preparation cost. And is prepared by the present inventionThe photocatalyst has uniform microstructure, good photocatalytic stability and high magnetic permeability.)

1. A low-temperature preparation method of a magnetic bismuth-containing iron oxide photocatalyst is characterized by comprising the following steps: the method comprises the following steps:

step 1, dissolving Bi (NO) by using ethylene glycol₃)₃·5H₂O to obtain Bi (NO) with the mass fraction of 4.3%₃)₃Solution of Fe (NO) dissolved in deionized water₃)₃·5H₂O obtains 5 to 30 mass percent of Fe (NO)₃)₃A solution; then Bi (NO)₃)₃Solution and Fe (NO)₃)₃Mixing the solutions to prepare a reaction solution A;

step 2, dissolving NaBH by using deionized water₄Obtaining NaBH with the mass fraction of 9 to 18.5 percent₄Solution, then to NaBH₄Adding 10% NaOH aqueous solution in mass fraction into the solution to obtain reaction solution B;

step 3, dropwise adding the reaction solution B into the reaction solution A while stirring, wherein the dropwise adding stirring time is 2-3 h, and obtaining a reaction solution C;

and 4, placing the reaction solution C in a reaction kettle, cooling to room temperature after the heating reaction is finished, centrifuging, removing supernate, drying and grinding to obtain the magnetic bismuth-containing iron oxide photocatalyst.

2. According to the rightThe low-temperature preparation method of the magnetic bismuth-containing iron oxide photocatalyst according to claim 1, characterized by comprising the following steps: bi (NO) in said step 1₃)₃Solution with Fe (NO)₃)₃The volume ratio of the solution was 5: 1.

3. The method of claim 1, wherein the method comprises the steps of: the process of dropwise adding the reaction solution B into the reaction solution A to obtain the reaction solution C in the step 3 is carried out under the condition of ice-water bath.

4. The method of claim 1, wherein the method comprises the steps of: NaBH in the step 2₄The volume ratio of the solution to the aqueous NaOH solution was 5: 1.

5. The method of claim 1, wherein the method comprises the steps of: the specific operation process of the step 4 is as follows: and (3) placing the reaction solution C into a reaction kettle, placing the reaction kettle into a box-type resistance heating furnace, preserving the temperature at 180 ℃ for 12-24 h to complete heating reaction, naturally cooling to room temperature, performing solid-liquid separation by using a centrifugal machine, removing supernatant, drying and grinding to obtain the bismuth iron oxide composite magnetic material.

6. The method of claim 5, wherein the method comprises the steps of: the drying is carried out by using a forced air drying oven or a vacuum drying oven.

Technical Field

The invention relates to a low-temperature preparation method of a magnetic bismuth-containing iron oxide photocatalyst, belonging to the technical field of preparation of magnetic photocatalyst materials.

Background

The magnetic material is a substance capable of directly or indirectly generating magnetism from transition elements such as iron, cobalt, nickel, and alloys thereof. Ferromagnetic substances and ferrimagnetic substances are ferromagnetic substances, and magnetic materials are generally called ferromagnetic substances and are functional materials with wide ancient and dual purposes. Modern magnetic materials have been widely used and play an important role in the traditional and emerging fields of electronics, computers, information communication, medical treatment, aerospace, automobiles, wind power and the like.

The photocatalysis technology is regarded as a high-efficiency and green technical method due to the advantages of few intermediate products, energy conservation, simple use process, no secondary pollution and the like. The metal bismuth is a photocatalyst applied to the photocatalysis technology, and can be recycled as a catalyst, so that the provision of a recyclable magnetic bismuth-containing photocatalyst is necessary.

Disclosure of Invention

The invention provides a low-temperature preparation method of a magnetic bismuth-containing iron oxide photocatalyst, aiming at solving the problem of recycling of the existing bismuth-containing photocatalyst.

The technical scheme of the invention is as follows:

a low-temperature preparation method of a magnetic bismuth-containing iron oxide photocatalyst comprises the following operation steps:

step 1, dissolving Bi (NO) by using ethylene glycol₃)₃·5H₂O to obtain Bi (NO) with the mass fraction of 4.3%₃)₃Solution of Fe (NO) dissolved in deionized water₃)₃·5H₂O obtains 5 to 30 mass percent of Fe (NO)₃)₃A solution; then Bi (NO)₃)₃Solution and Fe (NO)₃)₃Mixing the solutions to prepare a reaction solution A;

step 2, dissolving NaBH by using deionized water₄Obtaining NaBH with the mass fraction of 9 to 18.5 percent₄Solution, then to NaBH₄Adding 10% NaOH aqueous solution in mass fraction into the solution to obtain reaction solution B;

step 3, dropwise adding the reaction solution B into the reaction solution A while stirring, wherein the dropwise adding stirring time is 2-3 h, and obtaining a reaction solution C;

and 4, placing the reaction solution C in a reaction kettle, cooling to room temperature after the heating reaction is finished, centrifuging, removing supernate, drying and grinding to obtain the bismuth-containing iron oxide composite magnetic material.

Preferably: bi (NO) in said step 1₃)₃Solution with Fe (NO)₃)₃The volume ratio of the solution was 5: 1.

Preferably: and in the step 3, dropwise adding the reaction solution B into the reaction solution A under the ice-water bath condition.

Preferably: NaBH in the step 2₄The volume ratio of the solution to the aqueous NaOH solution was 5: 1.

Preferably: the specific operation process of the step 4 is as follows: and (3) placing the reaction solution C into a reaction kettle, placing the reaction kettle into a box-type resistance heating furnace, preserving the temperature at 180 ℃ for 12-24 h to complete heating reaction, naturally cooling to room temperature, performing solid-liquid separation by using a centrifugal machine, removing supernatant, drying and grinding to obtain the bismuth iron oxide composite magnetic material.

Most preferably: the drying is carried out by using a forced air drying oven or a vacuum drying oven.

The invention has the following beneficial effects: the invention utilizes the solvothermal method to prepare the magnetic bismuth-containing iron oxide photocatalyst, has the advantages of short preparation time and relatively low preparation temperature, and saves the preparation cost. The photocatalyst prepared by the method has magnetism by compounding bismuth and ferric oxide with photocatalysis, can be recycled under the action of an external electric field, can be recycled, and reduces the cost while being environment-friendly. The photocatalyst prepared by the invention has uniform microstructure, good photocatalytic stability and high magnetic permeability.

Drawings

FIG. 1 is an SEM photograph of embodiment 1;

FIG. 2 is a hysteresis loop of a magnetic bismuth-containing iron oxide photocatalyst made in accordance with the present application;

FIG. 3 is a graph of the photocatalytic efficiency of magnetic bismuth-containing iron oxide photocatalysts made according to the present application;

fig. 4 is an SEM photograph of elemental bismuth.

Detailed Description

The experimental procedures used in the following examples are conventional unless otherwise specified.