A kind of preparation method of cobalt-doped porous ZnO for pollutant adsorption

A technology of pollutants and porous zinc oxide, which is applied in the direction of water pollutants, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of increasing production costs, and achieve the goals of improving absorption capacity, low cost, and increasing adsorption speed Effect

Active Publication Date: 2022-08-05
QILU INST OF TECH
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The synthesis methods of porous zinc oxide include hydrothermal method, direct precipitation method, vapor phase precipitation method, sol-gel method, etc. In order to improve the adsorption performance, organic solvents or surfactants are introduced, but the synthesis process of these methods involves the generation of waste water , which increases the production cost

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method of cobalt-doped porous ZnO for pollutant adsorption
  • A kind of preparation method of cobalt-doped porous ZnO for pollutant adsorption
  • A kind of preparation method of cobalt-doped porous ZnO for pollutant adsorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for synthesizing transition metal cobalt-doped porous zinc oxide for the adsorption of pollutants in water, comprising the following steps:

[0032] (1) Weigh 0.439g (2mmol) of zinc acetate and 0.0697g (0.28mmol) of cobalt acetate (Co:Zn=0.14:1) and dissolve them in 30mL of distilled water, stir magnetically for 30min; weigh 0.3953g (0.005moL) of ammonium bicarbonate Dissolve in 30 mL of distilled water and stir magnetically for 30 min; under magnetic stirring, add ammonium bicarbonate solution dropwise to the mixed solution of zinc acetate and cobalt acetate, and continue stirring for 30 min after the dropwise addition is complete. The solution after the dropwise addition was left to stand for 12 hours, filtered, and dried at 80° C. for 6 hours to obtain a basic zinc-cobalt carbonate complex.

[0033] (2) calcining the basic zinc cobalt carbonate obtained in step (1) at 400° C. at a constant temperature for 2 hours in a muffle furnace to obtain a cobalt-doped ...

Embodiment 2

[0040] As described in Example 1, the difference is that in step 1, cobalt acetate 0.0597 g (0.24 mmol) (Co:Zn=0.12:1) was replaced by cobalt acetate 0.0697 g (0.28 mmol) (Co:Zn=0.14:1).

[0041] Image 6 The nitrogen adsorption / desorption isotherm and pore size distribution diagram of the cobalt-doped zinc oxide prepared in this example, according to IUPAC regulations, the isotherm conforms to Type IV, H3 hysteresis loop, and a specific surface area of ​​52.95m 2 / g, with an average pore size of 18.6 nm and a pore volume of 0.304 cm 3 / g.

Embodiment 3

[0043] As described in Example 1, the difference is that in step 1, cobalt acetate 0.0796 g (0.32 mmol) (Co:Zn=0.16:1) was replaced by cobalt acetate 0.0697 g (0.28 mmol) (Co:Zn=0.14:1).

[0044] Figure 7The nitrogen adsorption / desorption isotherm and pore size distribution diagram of the cobalt-doped zinc oxide prepared in this example, according to IUPAC regulations, the isotherm conforms to Type IV, H3 hysteresis loop, and a specific surface area of ​​53.36 m 2 / g, with an average pore size of 24.5 nm and a pore volume of 0.299 cm 3 / g.

[0045] Through the above examples, the specific surface area of ​​the prepared cobalt-doped zinc oxide can reach 50m 2 Above / g, the average pore size is controllable between 15-25nm, and the pore size includes macropores, mesopores and micropores, which belong to a hierarchical pore structure. Various pores cooperate with each other, which improves the adsorption speed and expands the range of adsorbed molecules. , the adsorption perf...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
pore sizeaaaaaaaaaa
specific surface areaaaaaaaaaaa
Login to View More

Abstract

A preparation method of cobalt-doped porous ZnO for pollutant adsorption, comprising the following steps: (1) mixing zinc acetate, cobalt acetate and ammonium bicarbonate to obtain a basic zinc-cobalt carbonate compound, and drying; (2) mixing zinc acetate, cobalt acetate and ammonium bicarbonate The mixture obtained in step (1) is calcined to obtain a cobalt-doped porous zinc oxide composite material. This method utilizes the direct precipitation method to dope the transition metal cobalt in the ZnO lattice to prepare cobalt-doped ZnO composite porous nanosheets, which improves the adsorption performance of pure ZnO and expands the light absorption of ZnO scope. The material can be used for the purification, adsorption and photocatalytic degradation of dye sewage, and the material synthesis method is green, simple, and low in cost, and is a process that can be manufactured and applied on a large scale.

Description

technical field [0001] The invention relates to a method for synthesizing transition metal cobalt-doped porous ZnO for the adsorption of pollutants in water, and belongs to the field of inorganic micro-nano material preparation. Background technique [0002] With the development of industrial technology, water pollution has become a global environmental problem. Among them, dyes have strong toxicity, mutagenicity and carcinogenicity, and are currently recognized as the first pollutants in wastewater. Therefore, it is particularly important to treat dye wastewater quickly and efficiently before it is discharged. Various techniques such as biodegradation, photocatalysis, membranes, chemical oxidation, and adsorption can be used for the removal of dyes from aqueous solutions, but adsorption is considered to be the most convenient and promising method due to its simplicity, high efficiency, and low cost. [0003] Porous materials such as activated carbon, cellulose-based mater...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityPatents(China)
IPC IPC(8): B01J20/06B01J20/30B01J23/80C02F1/28C02F1/30C02F101/30
CPCB01J20/06B01J23/80C02F1/281C02F1/30B01J2220/42B01J2220/4812B01J2220/4806C02F2305/10C02F2101/308B01J35/39
Inventor包文亚宗建平程海蒂王欣欣韩佳佳赵业聪胡凯琦
OwnerQILU INST OF TECH