CN-122006655-A - BiOBr/NiFe-LDH composite material and preparation method and application thereof

Abstract

The invention belongs to the field of filtering and adsorbing of anionic dye methyl orange in a water system, and relates to a BiOBr/NiFe-LDH composite material, and a preparation method and application thereof. The preparation method comprises the steps of adding a nickel source, an iron source and a sustained-release alkali source into deionized water, mixing and stirring to obtain a uniform solution, carrying out hydrothermal reaction on the uniform solution, cooling to room temperature after the reaction is completed, sequentially washing, filtering, drying and grinding to obtain NiFe-LDH powder, adding the NiFe-LDH powder into a bromine source and a bismuth source, and carrying out ultrasonic treatment to obtain the BiOBr/NiFe-LDH composite material. Solves the problems of poor selectivity of the adsorption material to methyl orange, poor adsorption performance and the like.

Inventors

• FENG LIANGLIANG
• ZHOU XIAO
• SUN YUJIE
• HU XI
• Ding Congming
• HOU JINJIN
• HUANG JIANFENG
• CAO LIYUN

Assignees

• 陕西科技大学

Dates

Publication Date

20260512

Application Date

20260324

Claims (10)

1. 1. A method for preparing a BiOBr/NiFe-LDH composite material, which is characterized by comprising the following steps: Adding a nickel source, an iron source and a sustained-release alkali source into deionized water, and mixing and stirring to obtain a uniform solution; Carrying out hydrothermal reaction on the uniform solution, cooling to room temperature after the reaction is finished, and sequentially washing, suction filtering, drying and grinding to obtain NiFe-LDH powder; And thirdly, adding NiFe-LDH powder into a bromine source and a bismuth source, and performing ultrasonic treatment to obtain the BiOBr/NiFe-LDH composite material.
2. 2. A method of preparing a BiOBr/NiFe-LDH composite material according to claim 1, wherein in step one, said nickel source is nickel nitrate hexahydrate.
3. 3. A method of preparing a BiOBr/NiFe-LDH composite material according to claim 1, wherein in step one, said iron source is ferric nitrate nonahydrate.
4. 4. The method of claim 1, wherein in the first step, the slow-release alkali source is urea or dicyandiamide.
5. 5. The preparation method of the BiOBr/NiFe-LDH composite material according to claim 1, wherein in the first step, the molar ratio of the nickel source to the iron source to the sustained-release alkali source is (1.8-2.2): (0.9-1.1): (63-77).
6. 6. The method for preparing a BiOBr/NiFe-LDH composite material according to claim 1, wherein in the second step, the hydrothermal reaction temperature is 100-140 ℃, and the reaction time is 10-12 hours.
7. 7. The method for preparing a BiOBr/NiFe-LDH composite material according to claim 1, wherein in the third step, the molar ratio of the NiFe-LDH powder to the bromine source to the bismuth source is 0.095-0.136:1:1.
8. 8. The method for preparing the BiOBr/NiFe-LDH composite material according to claim 1, wherein the ultrasonic treatment is carried out at an ultrasonic temperature of 25-70 ℃ for 1-2 hours.
9. 9. A bilbr/NiFe-LDH composite material prepared by the method of any of claims 1 to 8, wherein said bilcr/NiFe-LDH composite material exhibits agglomerates formed by stacking of nanoplatelets.
10. 10. Use of the BiOBr/NiFe-LDH composite material of claim 9 as an adsorbent for treating methyl orange dye in wastewater.

Description

BiOBr/NiFe-LDH composite material and preparation method and application thereof Technical Field The invention belongs to the field of filtration and adsorption of anion dye methyl orange in a water system, and particularly relates to a BiOBr/NiFe-LDH composite material, and a preparation method and application thereof. Background With the rapid development of textile, printing and dyeing, paper-making and other industries, a large amount of industrial wastewater containing azo organic dyes is discharged into the natural environment, which forms a serious threat to the ecological system of water and human health. The methyl orange is used as a typical anionic azo dye, has the characteristics of strong chemical stability, difficult degradation, high toxicity and the like, is widely applied to the dyeing process of textile printing and dyeing, is easy to cause the decrease of the light transmittance of a water body after the wastewater is discharged, damages the living environment of aquatic organisms, and can cause adverse effects such as cancerogenesis, teratogenesis and the like on human bodies through food chain accumulation, so that the efficient removal of the methyl orange in the water body has become one of research hot spots in the field of environmental management. At present, the method for treating the wastewater containing methyl orange mainly comprises an adsorption method and the like. Among them, the adsorption method is considered as one of the most potential technologies for treating methyl orange-containing wastewater because of the outstanding advantages of simple operation, high treatment efficiency, controllable cost, no secondary pollution and the like. The composite material integrates the advantages of the components by carrying out composite modification on different components, and adopts strategies of regulating and controlling the specific surface area, pore structure, surface charge property and the like of the material, thereby improving the adsorption performance on target pollutants. Although the traditional adsorption materials (such as active carbon, zeolite, bentonite and the like) have certain adsorption capacity, the traditional adsorption materials have the defects of limited adsorption capacity, poor selectivity to methyl orange, poor regeneration performance and the like, and the advanced treatment of low-concentration methyl orange wastewater is difficult to realize. Therefore, the composite material which is simple in preparation process, low in cost, high in adsorption capacity, high in adsorption rate, good in stability and excellent in regeneration performance is developed, is used for efficiently adsorbing methyl orange in a water system, overcomes a plurality of defects of the adsorption material in the prior art, meets the actual requirements of industrial methyl orange-containing wastewater treatment, and has important practical significance and application value. Disclosure of Invention The invention solves the technical problems of poor selectivity of an adsorption material to methyl orange, poor adsorption performance and the like by providing a BiOBr/NiFe-LDH composite material and a preparation method and application thereof. The invention is realized by the following technical scheme: The invention discloses a preparation method of a BiOBr/NiFe-LDH composite material, which comprises the following steps: Adding a nickel source, an iron source and a sustained-release alkali source into deionized water, and mixing and stirring to obtain a uniform solution; Carrying out hydrothermal reaction on the uniform solution, cooling to room temperature after the reaction is finished, and sequentially washing, suction filtering, drying and grinding to obtain NiFe-LDH powder; And thirdly, adding NiFe-LDH powder into a bromine source and a bismuth source, and performing ultrasonic treatment to obtain the BiOBr/NiFe-LDH composite material. Further, in the first step, the nickel source is nickel nitrate hexahydrate. Further, in the first step, the iron source is ferric nitrate nonahydrate. In the first step, the slow-release alkali source is urea or dicyandiamide. In the first step, the molar ratio of the nickel source to the iron source to the sustained-release alkali source is (1.8-2.2): 0.9-1.1): 63-77. In the second step, the hydrothermal reaction temperature is 100-140 ℃ and the reaction time is 10-12 h. In the third step, the molar ratio of the NiFe-LDH powder to the bromine source to the bismuth source is 0.095-0.136:1:1. Further, the ultrasonic treatment condition is that the ultrasonic temperature is 25-70 ℃ and the ultrasonic treatment time is 1-2 hours. The invention also discloses a BiOBr/NiFe-LDH composite material prepared by the preparation method, and the BiOBr/NiFe-LDH composite material presents an aggregate formed by stacking nano sheets. The invention also discloses application of the BiOBr/NiFe-LDH composite material as an adsorbent in treating methy