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Preparation method of Fe and Co doped ZnO photocatalyst

A photocatalyst and nano-zinc oxide technology, applied in the field of photocatalysis, can solve the problem of ZnO band gap energy, limited influence of impurity level and lattice defects, limited photon quantum efficiency and redox ability of catalyst, and improved photocatalytic activity Limited range and other problems, to achieve the effect of improving photocatalytic activity, easy large-scale application, and simple and easy method.

Inactive Publication Date: 2018-03-06
YANTAI ZHIBEN INTPROP OPERATIONS MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the distribution of doping elements in the products produced by the publicly reported ZnO doping method is not uniform, and the bonding with oxygen atoms in the ZnO lattice is not firm. Therefore, doping has an impact on the band gap energy, The impact of impurity energy levels and lattice defects is very limited, so the light quantum efficiency and redox ability of the catalyst are limited, and the improvement of photocatalytic activity is limited

Method used

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  • Preparation method of Fe and Co doped ZnO photocatalyst
  • Preparation method of Fe and Co doped ZnO photocatalyst
  • Preparation method of Fe and Co doped ZnO photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of preparation method of Fe and Co doped ZnO photocatalyst, comprises the steps:

[0026] 1) Add 100g of nano-zinc oxide powder with a particle size of 10-30nm to 1000ml of prepared 0.25mol / L ferric chloride and [Co(NH 3 ) 6 ] Cl 3 In the mixed solution, the mass ratio of the mixed solute composed of nano-zinc oxide powder to ferric chloride and trivalent cobalt complex is controlled to be 2:1, Fe 3+ with Co 3+ The molar ratio is 1:1, stirring and mixing under ultrasonic conditions;

[0027] 2) Add dropwise 1000ml of ammonia solution with a concentration of 2wt% to the mixture obtained in step 1) while stirring, to precipitate metal ions, control the pH of the system to be 9 to 10, and place the system in a water bath shaker at 50°C after the addition is completed Mesocrystallization reaction for 24 hours, that is, a hydrotalcite-like structure grows in situ on the surface of nano-zinc oxide;

[0028] 3) The product obtained in step 2) was centrifuged, washe...

Embodiment 2

[0031] A kind of preparation method of Fe and Co doped ZnO photocatalyst, comprises the steps:

[0032] 1) Add 180g of nano-zinc oxide powder with a particle size of 10-30nm to 1000ml of prepared 0.1mol / L ferric nitrate and [Co(NH 3 ) 6 ] Cl 3 In the mixed solution, the mass ratio of the mixed solute composed of nano-zinc oxide powder to ferric nitrate and trivalent cobalt complex is controlled to be 5:1, and Fe 3+ with Co 3+ The molar ratio is 3:1, stir and mix evenly under ultrasonic conditions;

[0033] 2) Add dropwise 2000ml of sodium hydroxide solution with a concentration of 1% by weight to the mixture obtained in step 1) while stirring, to precipitate metal ions, and control the pH of the system to be 9 to 10. After the dropwise addition, place the system in a water bath at 60°C Crystallization reaction in the oscillator for 24 hours, that is, a hydrotalcite-like structure grows in situ on the surface of nano-zinc oxide;

[0034] 3) The product obtained in step 2) ...

Embodiment 3

[0037] A kind of preparation method of Fe and Co doped ZnO photocatalyst, comprises the steps:

[0038] 1) Add 350g of nano-zinc oxide powder with a particle size of 30-50nm to 1000ml of prepared 0.5mol / L ferric sulfate and [Co(NH 3 ) 6 ] Cl 3 In the mixed solution, the mass ratio of the mixed solute composed of nano-zinc oxide powder to ferric sulfate and trivalent cobalt complex is controlled to be 2:1, and Fe 3+ with Co 3+ The molar ratio of the mixture is 2:1, stirred and mixed evenly under ultrasonic conditions;

[0039] 2) Add dropwise 2000ml of potassium hydroxide solution with a concentration of 5wt% to the mixture obtained in step 1) while stirring to precipitate metal ions, control the pH of the system to be 9 to 10, and place the system in a water bath at 60°C after the addition is completed Crystallization reaction in the oscillator for 12 hours, that is, a hydrotalcite-like structure is grown in situ on the surface of nano-zinc oxide;

[0040] 3) The product ob...

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Abstract

The invention relates to a preparation method of a Fe and Co doped ZnO photocatalyst. The preparation method comprises the following steps of 1), adding nano zinc oxide powder into a well prepared mixed solution of a soluble iron salt and a trivalent cobalt coordination compound; 2), dropwise adding an inorganic base solution into a mixture, which is obtained in the step 1), while agitating, putting a system into a water-bath oscillator after finishing dropwise adding, and carrying out a crystallization reaction; 3), centrifugally separating a product, water-scrubbing, then putting into a baking oven, and drying, so as to obtain a catalyst precursor; 4), roasting the catalyst precursor to obtain the Fe and Co doped ZnO photocatalyst. According to the preparation method, by utilizing the lattice characteristic and the structural property of hydrotalcite, a hydrotalcite-like precursor which is of the structure of ZnFeCo / LDHs is synthesized on the surface of the zinc oxide in a crystallization manner; the light quantum efficiency of the doped ZnO photocatalyst obtained through roasting is improved; a visible light source of 400nm to 760nm can be absorbed as energy and the photocatalytic activity is promoted.

Description

technical field [0001] The invention relates to a method for preparing a ZnO photocatalyst, in particular to a method for preparing a ZnO photocatalyst doped with Fe and Co, and belongs to the technical field of photocatalysis. Background technique [0002] The rapid development of social economy has brought serious environmental degradation problems, especially the massive increase of industrial wastewater has made the problem of water pollution very serious. At present, the governments of various countries have fully realized the seriousness of the water pollution problem, so the research and technology development in this field have attracted much attention. As a representative of green energy, solar energy has the characteristics of extensiveness, sufficiency, permanence, cleanliness and safety, which are difficult for other conventional energy sources. Converting solar energy into chemical energy that can be used for catalysis has become a research hotspot that people ...

Claims

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Application Information

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IPC IPC(8): B01J23/80C02F1/30
CPCC02F1/30B01J23/002B01J23/80B01J2523/00C02F2305/10B01J35/39B01J2523/27B01J2523/842B01J2523/845
Inventor 赵世芬
Owner YANTAI ZHIBEN INTPROP OPERATIONS MANAGEMENT CO LTD