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Cubic nano CeO2 and application thereof in degrading o-aminophenol

A technology of o-aminophenol and cubic nanometers, which is applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of difficult and effective treatment of aminophenol wastewater, lack of further research in application, and limited application prospects , to achieve the effects of high-efficiency oxidase catalytic activity, good promotion and application value, and good application prospects

Inactive Publication Date: 2016-07-06
ZHENGZHOU UNIVERSITY OF AERONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Later, people discovered a variety of nanomaterials such as gold nanoparticles, Co 3 o 4 , carbon quantum dots, FeS, V 2 o 5 have also been found to have peroxidase-like activity, but these simulated enzymes almost always use hydrogen peroxide as the oxidant to catalyze the reaction, which greatly limits the potential application prospects of these materials
In 2009, the Perez team discovered CeO 2 Nanoparticles do not require the presence of hydrogen peroxide to oxidize substrates and have the activity of mimicking oxidases, but about CeO 2 There is still a lack of further research on the application of
Because the production wastewater containing o-aminophenol has high concentration, deep color, refractory degradation, poor biodegradability, high toxicity, and troublesome treatment, it is difficult to effectively treat aminophenol wastewater by general methods for treating classified wastewater
The emergence of a new type of nano-mimetic oxidase provides a new solution for the treatment of phenol-containing wastewater, but there is no report on the combination of the two.

Method used

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  • Cubic nano CeO2 and application thereof in degrading o-aminophenol

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Embodiment 1

[0046] Before introducing specific examples, at first prepare CeO among the present invention 2 The technical principle is briefly introduced as follows.

[0047] The present invention uses Ce(NO 3 ) 3 ·6H 2 O as a cerium source, urea as a precipitant, and CTAB as a surfactant, CeO was first prepared by a hydrothermal method 2 precursor, and then calcine this precursor to prepare living CeO 2 . The specific reaction mechanism is as follows:

[0048] First, in the reaction mixture solution, urea decomposes to produce ammonium ions and cyanate ions:

[0049] h 2 N-CO-NH 2 →NH 4 + +OCN - ;

[0050] When under acidic conditions, the cyanate ion reacts rapidly as follows:

[0051] OCN - +2H + +H 2 O→CO 2 +NH 4 + ;

[0052] When under neutral or alkaline conditions, the following reactions will occur:

[0053] OCN - +OH - +H 2 O→NH 3 +CO 3 2- ;

[0054] Due to Ce 3+ Being weakly alkaline and highly charged, strong hydration will occur, specifically:

[...

Embodiment 2

[0087] Since the determination of the concentration of o-aminophenol in the solution is mainly determined based on the relationship between concentration and absorbance in the present invention, the present invention first needs to draw a standard curve corresponding to the concentration of o-aminophenol and the absorbance, and the specific process is as follows:

[0088]Prepare 0mg / L, 10mg / L, 20mg / L, 30mg / L, 40mg / L, 50mg / L, 60mg / L, 70mg / L o-aminophenol solutions respectively, use distilled water as a blank control, and adjust the detection wavelength to 280nm , respectively measure the absorbance with a UV-Vis spectrophotometer, and draw a standard curve.

[0089] The result is as Figure 5 shown. exist Figure 5 Among them, the ordinate Y represents the absorbance (Abs), and the abscissa X represents the mass concentration c (mg / L) of o-aminophenol in the solution. In addition, it can be seen from the figure that the linear regression equation of o-aminophenol is Y=0.0346X...

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Abstract

The invention belongs to the technical field of water treatment, and particularly relates to a cubic nano cerium oxide (CeO2) and application thereof as a mimic oxidase in degrading o-aminophenol. In the CeO2 preparation process, Ce(NO3)3.6H2O is used as a cerium source, urea is used as a precipitant, and CTAB (cetyltrimethylammonium bromide) is used as a surfactant. A precursor is firstly prepared, and the precursor is calcined to obtain the CeO2. Compared with the natural oxidase, the cerium oxide provided by the invention has the advantages of high stability, low denaturation tendency, wide application range and high reutilization ratio, is easy for storage and transportation, also has high-efficiency oxidase catalytic activity, and thus, can well substitute the existing natural oxidase. When the cerium oxide provided by the invention is used in degrading o-aminophenol, the maximum degradation rate can reach 70% or above.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a cubic nanometer ceria (CeO 2 ) and its application as a mimetic oxidase in the degradation of o-aminophenol. Background technique [0002] Enzymes are efficient biocatalysts that participate in almost all reactions in living organisms. Enzymes have the characteristics of high efficiency, specificity, diversity and mildness. Natural enzymes have significant practical applications in medicine, chemical industry, food processing, environmental protection and agriculture. However, natural enzymes have disadvantages such as variability and inactivation, high price, difficult purification, high storage and use costs, which limit their wide application. Therefore, the study of mimic enzymes that mimic the molecular recognition of natural enzymes to substrates and highly efficient catalysis has become a top priority. [0003] Since Yan Xiyun's research group first discovere...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00B82Y30/00B01J23/10C02F1/00
CPCB01J23/10B82Y30/00C01F17/206C01P2002/72C01P2004/03C01P2004/62C02F1/00C02F2101/345
Inventor 李春光彭伟功陈淑敏罗旭梁丽珍周浩崔节虎张珂
Owner ZHENGZHOU UNIVERSITY OF AERONAUTICS
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