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Method for regulating selective generation of oxidation active matter of iron-based Fenton catalyst

An oxidation activity and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem that active species cannot be selectively controlled, and achieve metal dissolution. Low content, stable structure, and the effect of avoiding damage

Active Publication Date: 2021-07-02
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Based on the problem that the active species in the heterogeneous Fenton system cannot be selectively regulated in the prior art, the present invention provides a method for regulating the selective generation of the oxidation active species of the iron-based Fenton catalyst; by reasonably setting the type and ratio of the metal salt , the iron-based Fenton catalyst was prepared by co-precipitation-gradient pyrolysis, which can effectively solve the problem that the active species cannot be selectively regulated in the heterogeneous Fenton system

Method used

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  • Method for regulating selective generation of oxidation active matter of iron-based Fenton catalyst
  • Method for regulating selective generation of oxidation active matter of iron-based Fenton catalyst
  • Method for regulating selective generation of oxidation active matter of iron-based Fenton catalyst

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Embodiment 1

[0049] This embodiment provides a method for regulating the selective generation of oxidation active substances of iron-based Fenton catalysts, wherein the preparation process of iron-based Fenton catalysts is as follows:

[0050] 1) 0.1M Ti(SO 4 ) 2 and 1.0M Fe(ClO 4 ) 3 Dissolved in 10% methanol solution to obtain solution X;

[0051] 2) Add 1.0M NH 4 The OH solution was added dropwise to the solution X, and the mechanical stirring at 300rpm was continuously mixed during the dropping process to obtain a suspension Y with a pH of 7;

[0052] 3) Place the suspension Y in a water bath at 60°C for 300rpm and mechanically stir for 1h, then let stand for 1h;

[0053] 4) Place the suspension Y in a tube furnace with an initial temperature of 60°C and a heating rate of 15°C / min to 300°C for 3 hours;

[0054] 5) The obtained material was washed with deionized water, centrifuged, and vacuum-dried at 50° C. for 12 hours to obtain an iron-based Fenton catalyst.

[0055] In the ir...

Embodiment 2

[0059] This embodiment provides a method for controlling the selective generation of oxidation active substances of iron-based Fenton catalysts, wherein the preparation process of iron-based Fenton catalysts is basically the same as that of Example 1, the difference being: 1) 0.1M Ti(SO 4 ) 2 and 0.5MFe(ClO 4 ) 3 Dissolved into 10% methanol solution to obtain solution X.

[0060] Therefore, in the iron-based Fenton catalyst of this example, A1 / B1=5:1, and the degradation rate data of bisphenol A are shown in Table 1. image 3 HO in this example · and the contribution rate of Fe(IV) / Fe(V) to the degradation of bisphenol A. The contribution rate of Fe(IV) / Fe(V) in the system reaches 80% at pH=7, indicating that the oxidation active species generated by the catalyst at pH=7 is dominated by Fe(IV) / Fe(V) Contribution, that is, the generated oxidation active species is mainly Fe(IV) / Fe(V), which can be used as a catalyst to catalyze the generation of oxidation active species as...

Embodiment 3

[0062] This embodiment provides a method for controlling the selective generation of oxidation active substances of iron-based Fenton catalysts, wherein the preparation process of iron-based Fenton catalysts is basically the same as that of Example 1, the difference being: 1) 0.1M Ti(SO 4 )2 and 0.1MFe(ClO 4 ) 3 Dissolved into 10% methanol solution to obtain solution X.

[0063] Therefore, in the iron-based Fenton catalyst of this example, A1 / B1=1:1, and the degradation rate data of bisphenol A are shown in Table 1. Figure 4 HO in this example · and the contribution rate of Fe(IV) / Fe(V) to the degradation of bisphenol A. The contribution rate of Fe(IV) / Fe(V) in the system reaches 89% at pH=7, indicating that the oxidation active species generated by this catalyst at pH=7 is mainly played by Fe(IV) / Fe(V) Contribution, that is, the generated oxidation active species is mainly Fe(IV) / Fe(V), which can be used as a catalyst to catalyze the generation of oxidation active specie...

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Abstract

The invention discloses a method for regulating selective generation of oxidation active matters of an iron-based Fenton catalyst, which belongs to the technical field of advanced oxidation catalysis. The catalyst is obtained by carrying out gradient pyrolysis treatment on a product obtained by carrying out a co-precipitation reaction on salt A and salt B. The salt A comprises ferric salt; positive ions in the salt B comprise other metal ions except iron; the heating rate of the gradient pyrolysis treatment is 5 DEG C / min-15 DEG C / min, and the temperature difference between the temperature after the pyrolysis treatment and the temperature before the treatment is 60 DEG C-480 DEG C; the molar weight of an iron element in the salt A is A1, and the molar weight of other metal ions except iron in the salt B is B1; and the generation types of catalytic oxidation active matters of the catalyst are controlled by adjusting A1 / B1. According to the method, the contribution rate of hydroxyl free radicals or high-valence iron in a Fenton reaction system can be controlled to be 80% or above, so that the purpose of selectively controlling the types of oxidation active matters is achieved.

Description

technical field [0001] The invention belongs to the technical field of advanced oxidation catalysis, and in particular relates to a method for regulating and controlling the selective generation of oxidation active substances of iron-based Fenton catalysts. Background technique [0002] In the heterogeneous Fenton process, free hydroxyl groups (HO ), singlet oxygen ( 1 o 2 ) and high-valent iron (Fe(IV) / Fe(V)) and other oxidation active species. The pathways for the generation of these active species vary, and their mechanisms of action vary widely. HO · The strong oxidizing and electrophilic addition properties make it widely used in the process of environmental pollution control; 1 o 2 Strong selectivity to unsaturated bonds and good antibacterial effect can play a key role in chemical synthesis and medical treatment; for the interfacial oxidation process that occurs at the interface of heterogeneous catalysts Fe(IV) / Fe(V) , due to the influence of its surface charge...

Claims

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Application Information

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IPC IPC(8): B01J23/745C02F1/72C02F101/34
CPCB01J23/745C02F1/722C02F1/725C02F2305/026C02F2101/345
Inventor 张炜铭尹越任逸吕路花铭潘丙才
Owner NANJING UNIV
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