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Preparation method of Zn-doped alpha-Fe2O3/graphene aerogel composite catalyst and oxidation system and application of Zn-doped alpha-Fe2O3/graphene aerogel composite catalyst

A graphene aerogel, composite catalyst technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. Ideal, long residual time and other problems, to achieve the effect of good visible light response capability, strong market application prospects, and avoid secondary effects

Pending Publication Date: 2021-04-23
HENAN NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, studies have shown that the extensive use of sulfa drugs will cause bacteria to develop drug resistance, and may also interact with other pollutants such as veterinary drugs and pesticides in vivo, resulting in unpredictable consequences
Such drugs degrade very slowly in the environment and remain for a long time. After long-term accumulation and transmission in the biological chain, they will reach high concentrations in animals, plants and humans, affecting the growth of animals and plants, endangering human health, and causing serious environmental pollution
Sulfa drug wastewater is also one of the typical refractory organic wastewater, and the removal effect of conventional biological treatment is not ideal

Method used

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  • Preparation method of Zn-doped alpha-Fe2O3/graphene aerogel composite catalyst and oxidation system and application of Zn-doped alpha-Fe2O3/graphene aerogel composite catalyst
  • Preparation method of Zn-doped alpha-Fe2O3/graphene aerogel composite catalyst and oxidation system and application of Zn-doped alpha-Fe2O3/graphene aerogel composite catalyst
  • Preparation method of Zn-doped alpha-Fe2O3/graphene aerogel composite catalyst and oxidation system and application of Zn-doped alpha-Fe2O3/graphene aerogel composite catalyst

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preparation example Construction

[0030] Specifically, the Zn-doped α-Fe provided by the present invention 2 o 3 The preparation method of / graphene airgel composite catalyst, method comprises the steps:

[0031] Step 1, graphene is pretreated to obtain graphene oxide.

[0032] Graphene oxide was prepared from natural graphite powder by the improved Hummers method. The graphene processing method is relatively mature at this stage, and will not be described in detail here.

[0033] In step 2, the graphene oxide is dispersed in a certain amount of deionized water to obtain a graphene oxide dispersion.

[0034] Specifically, graphene oxide was ultrasonically dispersed in 25-35 mL of deionized water to obtain a graphene oxide dispersion with a concentration of 2-10 mg / mL.

[0035] Step 3, adding a preset amount of FeSO to the graphene oxide dispersion 4 ·7H 2 O and Zn(Ac) 2 2H 2O to get the precursor solution.

[0036] Specifically, sequentially add 0.1~0.4mmol FeSO 4 ·7H 2 O, 0.05~0.4 mmol Zn(Ac) 2 2H ...

Embodiment 1

[0046] The first is to use the improved Hummers method to prepare graphene oxide from natural graphite powder. Graphene oxide was dispersed in 30 mL of aqueous solution to obtain a graphene oxide dispersion with a concentration of 2 mg / mL. Then add 0.1mmol FeSO 4 ·7H 2 O, 0.05mmol Zn(Ac) 2 2H 2 O, stirred until dissolved and uniformly dispersed, then transferred the solution to a hydrothermal kettle and kept at 180°C for 3h. Cool to room temperature to obtain a hydrogel, which is then freeze-dried after dialysis to obtain a macroscopic bulk Zn-doped α-Fe 2 o 3 / Graphene airgel composite catalyst. Under normal indoor conditions, 10g Zn doped α-Fe 2 o 3 The / graphene airgel composite catalyst was added to 1L of Oxone solution with a concentration of 30 mg / L to degrade 1L of sulfamethoxypyrimidine wastewater with a concentration of 15mg / L for 100min, and the degradation rate was 72.1%. During the photocatalytic degradation process, the catalyst will be slightly broken by...

Embodiment 2

[0048] The first is to use the improved Hummers method to prepare graphene oxide from natural graphite powder. Graphene oxide was dispersed in 30 mL of aqueous solution to obtain a graphene oxide dispersion with a concentration of 4 mg / mL. Then add 0.2mmol FeSO 4 ·7H 2 O, 0.15mmol Zn(Ac) 2 2H 2 O, stirred until dissolved and uniformly dispersed, then transferred the solution to a hydrothermal kettle and kept at 190°C for 2.5h. Cool to room temperature to obtain a hydrogel, which is then freeze-dried after dialysis to obtain a macroscopic bulk Zn-doped α-Fe 2 o 3 / Graphene airgel composite catalyst. Under normal indoor conditions, 10g Zn doped α-Fe 2 o 3 The / graphene airgel composite catalyst was added to 1L of Oxone solution with a concentration of 30 mg / L to degrade 1L of sulfa-methoxypyrimidine wastewater with a concentration of 15 mg / L for 100 minutes, and the degradation rate was 83.8%. The catalyst will not change under the impact of water flow during the photoc...

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Abstract

The invention provides a preparation method of a Zn-doped alpha-Fe2O3 / graphene aerogel composite catalyst as well as an oxidation system and application of the Zn-doped alpha-Fe2O3 / graphene aerogel composite catalyst. The preparation method comprises the following steps: pretreating graphene to obtain graphene oxide; dispersing the graphene oxide in a certain amount of deionized water to obtain a graphene oxide dispersion liquid; adding a preset amount of FeSO4.7H2O and Zn(Ac)2.2H2O into the graphene oxide dispersion liquid to obtain a precursor solution; putting the precursor solution into a hydrothermal kettle, and conducting reacting at a preset temperature for a preset time to obtain initial gel; and cooling, dialyzing and drying the initial gel to obtain the Zn-doped alpha-Fe2O3 / graphene aerogel composite catalyst. The Zn-doped alpha-Fe2O3 / graphene aerogel composite catalyst is good in catalytic performance and has relatively good visible light response capability.

Description

technical field [0001] The invention relates to the technical field of catalytic materials, in particular to a Zn-doped α-Fe 2 o 3 / Graphene airgel composite catalyst preparation method and its oxidation system and application. Background technique [0002] Antibiotics are secondary metabolites or synthetic analogues produced by bacteria, molds or other microorganisms that can affect other reproductive cell developmental functions. Antibiotic production wastewater, domestic sewage, medical wastewater, and the discharge of various types of antibiotics produced in the breeding process of veterinary and aquaculture industries are all sources of antibiotic problems in the environment. [0003] Sulfonamides are a class of synthetic antibacterial and anti-inflammatory drugs commonly used in modern medicine. It is widely used in animal husbandry and aquaculture because of its broad antibacterial spectrum, definite curative effect, stable properties, low price, and easy long-te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J37/10B01J37/03B01J37/32C02F1/30C02F101/34C02F101/38
CPCB01J23/80B01J23/002B01J37/10B01J37/036B01J37/32C02F1/30C02F2305/10C02F2101/34C02F2101/38C02F2101/40B01J35/23B01J35/39
Inventor 董淑英刘亚菲李文莉吴亚雯韩晓旭杨静怡罗午月田格格
Owner HENAN NORMAL UNIV
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