Heterogeneous metal-free fenton catalyst and preparation method and purpose thereof

A metal-free, catalyst-free technology, applied in catalyst activation/preparation, non-metallic elements, chemical instruments and methods, etc., can solve problems such as low reaction cost

Active Publication Date: 2017-06-09
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Literature (Molecular mechanism for metal-independent production of hydroxyl radicals by hydrogen peroxide and halogenated quinones.PNAS 104(2007):17575-17578) found that H 2 o 2 Chloranil, a metabolite of chlorophenol, can generate hydroxyl radicals through a pathway independent of metal ions, and chloroquinone can be dehalogenated and detoxified at the same time. The reaction cost is low and pollutants can be degraded at the same time. It is an ideal A new free radical generation method, but if the residual chloranil is in the aqueous solution, it will be dangerous

Method used

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  • Heterogeneous metal-free fenton catalyst and preparation method and purpose thereof
  • Heterogeneous metal-free fenton catalyst and preparation method and purpose thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] A method for producing hydroxyl radicals, comprising the steps of:

[0063] (1) Ultrasonicate 1.5 mg / mL graphite oxide solution in water for 1 h with a power of 50 W to form a uniform graphite oxide dispersion;

[0064] (2) Chloroquinone solution is added dropwise in the graphite oxide dispersion liquid of step (1) gained, the concentration ratio of chloranil and graphene is 3:1, ultrasonic grafting 1h, ultrasonic power is 50W, obtains surface Graphite oxide dispersion liquid grafted with chlorobenzoquinone;

[0065] (3) H 2 o 2 Solution adds step (2) gained surface to be grafted in the graphite oxide dispersion liquid that has chloranil to start reaction, H 2 o 2 The concentration ratio of the concentration of the halogenated quinone to the concentration of the halogenated quinone is 5:1, and the pH of the system is adjusted to 7, and the system is stirred in a water bath at 30°C, and the stirring rate is 100r / min;

[0066] (4) When the reaction time was 2h, 4h, 6...

Embodiment 2

[0070] A method for producing hydroxyl radicals, comprising the steps of:

[0071] (1) Take 2 mg / mL of graphite oxide solution and ultrasonically put it in water for 1.5h with a power of 50W to form a uniform graphite oxide dispersion;

[0072](2) Add tetrafluorobenzoquinone solution dropwise to the graphite oxide dispersion obtained in step (1), the concentration ratio of tetrafluorobenzoquinone and graphene is 2:1, ultrasonic grafting 1h, ultrasonic power is 80W, obtain surface Graphene oxide dispersion liquid grafted with tetrafluorobenzoquinone;

[0073] (3) H 2 o 2 Solution adds step (2) gained surface and has in the graphene oxide dispersion liquid that tetrafluorobenzoquinone is grafted and starts reaction, wherein H 2 o 2 The concentration ratio to tetrafluorobenzoquinone is 2.5:1, adjust the pH of the system to 7.4, stir the system in a water bath at 25°C for 2 hours, and the stirring rate is 100r / min;

[0074] (4) After 0.5h, 1h and 2h of reaction, the reaction ...

Embodiment 3

[0077] A method for producing hydroxyl radicals, comprising the steps of:

[0078] (1) Take a 3 mg / mL activated carbon solution and ultrasonicate it in water for 2 hours with a power of 80W to form a uniform activated carbon dispersion;

[0079] (2) 2,5-dichlorobenzoquinone solution is added dropwise to the activated carbon dispersion obtained in step (1), the concentration ratio of 2,5-dichlorobenzoquinone and graphene is 3:1, ultrasonic grafting 1h, The ultrasonic power is 60W, and the activated carbon dispersion with 2,5-dichlorobenzoquinone grafted on the surface is obtained;

[0080] (3) H 2 o 2 The solution adds step (2) gained surface and has 2,5-dichlorobenzoquinone in the active carbon dispersion liquid that starts reaction, wherein, H 2 o 2 The concentration ratio to 2,5-dichlorobenzoquinone is 2:1, adjust the pH of the solution to 6.8, stir the system in a water bath at 25°C, and the stirring rate is 100r / min;

[0081] (4) When reacting for 1 hour, 3 hours and ...

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Abstract

The invention provides a heterogeneous metal-free fenton catalyst and a preparation method and a purpose thereof. The catalyst is a carbon base material bonded with halogenated quinine on the surface; the carbon base material and the halogenated quinine have a synergistic effect; the catalyst is prepared through grafting the halogenated quinine on carbon base materials or introducing chlorine gas for oxidization in the carbon base material carbonization process. The catalyst has the advantages that the cost of generating hydroxyl radicals is low; the process is safe, simple and convenient; the conditions for generating hydroxyl radicals is mild; no secondary pollution exists; the free radical yield is high; the yield is continuous and stable; the hydroxyl radicals can be effectively generated under the condition of not using chemical products with harmful effects on the human body; no byproduct exists; in addition, the additional addition of difficult-to-separate substances is not needed; important application values are realized in the fields of organic contaminant degradation and the like.

Description

technical field [0001] The invention belongs to the technical field of catalytic nanomaterials, and relates to a heterogeneous metal-free Fenton catalytic material and its preparation method and application, in particular to a method for generating hydroxyl radicals by a heterogeneous metal-free Fenton catalyst. Background technique [0002] Hydroxyl radical is an active oxygen group with high reactivity. It has strong oxidizing ability and can react with proteins, DNA, lipids, etc. It has a high reaction rate to organic matter, is non-selective and does not produce secondary pollution. Therefore, hydroxyl radicals The generation of free radicals is an important research field in the degradation of toxic and harmful pollutants in the environmental field. The currently developed methods for generating hydroxyl radicals (·OH) mainly include Fenton reaction, Haber-Weiss reaction (Haber-Weiss), ozone and ultraviolet irradiation, corona discharge or plasma discharge and so on. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02C02F1/72
CPCB01J31/006B01J31/0232C02F1/722C02F1/725C02F2101/308C02F2101/345C02F2101/36C02F2101/38C02F2305/023C02F2305/026B01J21/18B01J21/185B01J31/0208B01J37/0072B01J37/12B01J37/343B01J2231/70C01B13/14C01B32/168C01B32/194C01B32/198B01J37/0219B01J37/04B01J37/24
Inventor 赵赫曹宏斌张笛
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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