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, achieve improved absorption capacity, good repeatability, and optimize adsorption performance Effect

Active Publication Date: 2019-12-13
QILU INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Preparation method of cobalt-doped porous ZnO for pollutant adsorption
  • Preparation method of cobalt-doped porous ZnO for pollutant adsorption
  • Preparation method of cobalt-doped porous ZnO for pollutant adsorption

Examples

Experimental program
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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) Dissolve 0.439g (2mmoL) of zinc acetate and 0.0697g (0.28mmol) of cobalt acetate (Co:Zn=0.14:1) in 30mL of distilled water, and stir magnetically for 30min; weigh 0.3953g (0.005moL) of ammonium bicarbonate Dissolve in 30mL distilled water, and stir magnetically for 30min; under magnetic stirring, add the ammonium bicarbonate solution dropwise to the mixed solution of zinc acetate and cobalt acetate, and continue stirring for 30min after the addition is complete. After the dropwise addition, the solution was left to age 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) in a muffle furnace at a constant temperature of 400° C. for 2 hours to obtain a cobalt-doped zinc oxide composite m...

Embodiment 2

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

[0041] Figure 6 The nitrogen adsorption / desorption isotherm and pore size distribution diagram of the cobalt-doped zinc oxide prepared for this example, according to IUPAC regulations, the isotherm conforms to type IV, H3 hysteresis ring, and the specific surface area is 52.95m 2 / g, the average pore diameter is 18.6nm, and the pore volume is 0.304cm 3 / g.

Embodiment 3

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

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

[0045] Through the above examples, the prepared cobalt-doped zinc oxide specific surface area can reach 50m 2 More than / g, the average pore size is controllable between 15-25nm, the pore size includes macropores, mesopores and micropores, which belong to the multi-level pore structure, and various pores cooperate with each other to increase the adsorption speed and expand the range of adsorbed molecules , optimized t...

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Abstract

The invention relates to a preparation method of cobalt-doped porous ZnO for pollutant adsorption, and the method comprises the following steps:(1)mixing zinc acetate, cobalt acetate and ammonium bicarbonate to obtain a basic zinc carbonate cobalt compound, and drying; and(2)calcining the mixture obtained in the step(1)to obtain a cobalt-doped porous zinc oxide composite material. According to themethod, transition metal cobalt is doped in zinc oxide crystal lattices through a direct precipitation method, the cobalt-doped zinc oxide compound porous nanosheet is prepared, the adsorption performance of pure zinc oxide is improved, and the light absorption range of zinc oxide is expanded. The material can be used for purification, adsorption and photocatalytic degradation of dye sewage, thematerial synthesis method is green, simple and convenient, the cost is low, and the material is a process capable of being manufactured and applied on a large scale.

Description

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

Claims

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Application Information

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Patent Type & AuthorityApplications(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