N-doped graphene-cerium oxide composite catalyst and application of N-doped graphene-cerium oxide composite catalyst to treatment of degradation-resistant acid wastewater

A composite catalyst and cerium oxide technology, which is applied in the direction of oxidized water/sewage treatment, physical/chemical process catalyst, water/sewage treatment, etc., can solve the problem of low treatment efficiency, achieve high degradation and mineralization efficiency, and low synthesis cost , to avoid the effect of secondary pollution

Active Publication Date: 2018-07-06
HANGZHOU CHENGJIE ENVIRONMENTAL PROTECTION
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the low efficiency of the existing ozone advanced oxidation technology in treating organic pollutants under acidic conditions, the purpose of the present invention is to provide an N-doped graphene-cerium oxide composite catalyst, which can be effective in acidic or even strongly acidic conditions Catalytic Ozone Oxidation Degradation of Organic Pollutants

Method used

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  • N-doped graphene-cerium oxide composite catalyst and application of N-doped graphene-cerium oxide composite catalyst to treatment of degradation-resistant acid wastewater
  • N-doped graphene-cerium oxide composite catalyst and application of N-doped graphene-cerium oxide composite catalyst to treatment of degradation-resistant acid wastewater
  • N-doped graphene-cerium oxide composite catalyst and application of N-doped graphene-cerium oxide composite catalyst to treatment of degradation-resistant acid wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1 N-doped graphene-cerium oxide composite catalyst (NG-CeO 2 ) preparation

[0048] (1) Weigh 0.4g of cerous nitrate hexahydrate and 0.2g of glucose and dissolve in 20ml of water, add 2.0g of melamine and transfer to a ceramic crucible, and stir thoroughly. Put it in a forced air drying oven and dry it at 80°C for 12 hours to obtain a light yellow solid.

[0049] (2) Fully grind the light yellow solid in step (1), transfer the solid to a tube furnace, and burn it at 450°C for 1 hour under the protection of nitrogen, then raise the temperature to 800°C at a heating rate of 5°C / min After roasting for 1.5h, after cooling to room temperature, a black powder was obtained. The nitrogen flow rate is 0.01L / min.

[0050] The black powder obtained in step (2) is ground to obtain the N-doped graphene-cerium oxide composite catalyst (NG-CeO 2 ).

[0051] NG-CeO 2 The SEM characterization diagram, XRD characterization diagram and Raman characterization diagram are r...

Embodiment 2

[0056] Adopt the NG-CeO that embodiment 1 prepares 2 Catalytic H 2 o 2 / O 3 The system degrades acetic acid simulated wastewater. The acetic acid concentration in the acetic acid simulated wastewater is 100 mg / L, and the volume of the acetic acid simulated wastewater is 250 ml. Based on the volume of acetic acid simulated wastewater, the dosage of catalyst is 0.04g / L, the concentration of hydrogen peroxide is 100mg / L, and then the pH value of acetic acid simulated wastewater is adjusted to 1.0 with sulfuric acid.

[0057] The experiment adopts the semi-batch method, O 2 / O 3 The mixed gas flow rate is 0.1L / min, and the ozone concentration in the mixed gas is 99mg / L.

Embodiment 3～6

[0069] Adopt the NG-CeO that embodiment 1 prepares 2 Catalytic H 2 o 2 / O 3The system degrades acetic acid simulated wastewater. The acetic acid concentration in the acetic acid simulated wastewater is 100 mg / L, and the volume of the acetic acid simulated wastewater is 250 ml. Based on the volume of acetic acid simulated wastewater, the dosage of catalyst is 0.04g / L, the dosage of hydrogen peroxide is 100mg / L, and then the pH value of acetic acid simulated wastewater is adjusted to 5, 0.5, 0.25 with sulfuric acid and 0.

[0070] The experiment adopts the semi-batch method, O 2 / O 3 The mixed gas flow rate is 0.1L / min, and the ozone concentration in the mixed gas is 99mg / L.

[0071] After 60 minutes of reaction, samples were taken for detection, and the degradation of acetic acid simulated wastewater is shown in Table 1.

[0072] Table 1

[0073] Example

[0074] It can be seen from the data in Table 1 that NG-CeO 2 / H 2 o 2 / O 3 The catalytic system can ...

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Abstract

The invention discloses an N-doped graphene-cerium oxide composite catalyst. A preparation method of the N-doped graphene-cerium oxide composite catalyst comprises the following steps: (1) adding a CeO2 precursor, a carbon source and a nitrogen source into water, stirring evenly, and drying; (2) grinding a dried solid, roasting under the protection of nitrogen gas, cooling to obtain the N-doped graphene-cerium oxide composite catalyst. The invention further discloses the application of the N-doped graphene-cerium oxide composite catalyst to the treatment of degradation-resistant acid wastewater. The N-doped graphene-cerium oxide composite catalyst can effectively catalyze the oxidation of ozone under the acid or strong acid condition to degrade an organic pollutant.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to an N-doped graphene-cerium oxide composite catalyst and its application in the treatment of acidic refractory wastewater. Background technique [0002] With the rapid development of human industrial technology, global environmental pollution is becoming more and more serious. High-concentration, multi-component, refractory organic industrial wastewater is one of the most extensive and harmful pollution sources in environmental pollution. Therefore, organic wastewater has become a research object that has attracted much attention in environmental science and material engineering. In industrial production, processes such as nitration, sulfonation, esterification, alkylation, catalysis and drying of organic matter produce a large amount of high-concentration organic waste acid. It is difficult to directly utilize waste acid, and physical and biological methods in traditional tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/08C02F1/78C02F101/34
CPCB01J27/24B01J37/08C02F1/725C02F1/78C02F2101/34
Inventor 童少平丁亚磊朱显跃洪夏萍
Owner HANGZHOU CHENGJIE ENVIRONMENTAL PROTECTION
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