Iron/polydopamine/carbon composite catalyst with double properties of reduction and oxidation as well as preparation method and application of iron/polydopamine/carbon composite catalyst

A composite catalyst, polydopamine technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low catalytic performance, zero-valent iron and its composite materials. Poor stability, easy oxidation and other problems, to achieve the effect of improving catalytic performance, improving transfer efficiency, and high reducibility

Pending Publication Date: 2022-03-08
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems of poor stability, low catalytic performance and easy oxidation of zero-valent iron and its composite materials in the prior art, the present invention provides an iron / polydopamine / carbon composite catalyst with dual properties of reduction and oxidation and its preparation Methods and applications; through the design of iron / polydopamine / carbon composite catalyst with core-shell structure, the electron transfer efficiency is improved, and the presence of polydopamine further improves the reduction performance of the material, and at the same time improves the stability of ZVI, thereby effectively solving the problem of zero-valent iron and Its composite material has poor stability, low catalytic performance and easy oxidation

Method used

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  • Iron/polydopamine/carbon composite catalyst with double properties of reduction and oxidation as well as preparation method and application of iron/polydopamine/carbon composite catalyst
  • Iron/polydopamine/carbon composite catalyst with double properties of reduction and oxidation as well as preparation method and application of iron/polydopamine/carbon composite catalyst
  • Iron/polydopamine/carbon composite catalyst with double properties of reduction and oxidation as well as preparation method and application of iron/polydopamine/carbon composite catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] This embodiment provides an iron / polydopamine / carbon composite catalyst with both reduction and oxidation properties, and its specific preparation steps are as follows:

[0053] (1) Preparation of Fe / PDA composite structure: Take 1.5g of micron-sized zero-valent iron and ultrasonically disperse it in a Tris-HCl buffer solution with a pH of 8.5 and a concentration of 8mM. Under the participation of oxygen, self-polymerization was carried out for 24 hours, and after separation and washing, it was freeze-dried at -80°C for 12 hours in a vacuum environment to obtain a Fe / PDA composite structure with a core-shell structure. The mass ratio of dopamine and Fe inner core is 0.25 in the present embodiment, i.e. n=(1.59M 3 +M 2 ):M 1 = 0.25.

[0054] (2) Preparation of Fe / PDA 0.25 / C composite catalyst: take the Fe / PDA composite structure prepared in step (1) and place it under nitrogen, calcinate at 300°C for 3 hours, and obtain Fe / PDA after carbonization of the PDA surface ...

Embodiment 2

[0066] This example provides an iron / polydopamine / carbon composite catalyst with dual properties of reduction and oxidation. The specific preparation steps are basically the same as those in Example 1. The main differences between the two are:

[0067] 1) n=0.1 of the present embodiment, the prepared catalyst is Fe / PDA 0.1 / C composite catalyst.

Embodiment 3

[0069] This example provides an iron / polydopamine / carbon composite catalyst with dual properties of reduction and oxidation. The specific preparation steps are basically the same as those in Example 1. The main differences between the two are:

[0070] 1) n=0.5 of the present embodiment, the prepared catalyst is Fe / PDA 0.5 / C composite catalyst.

[0071] Embodiment 1~3 is compared, as Figure 5 , 7 As shown in and 9, when n=0.25, the degradation performance of the composite catalyst is optimal, combining Figure 9 Analysis of its electron transfer efficiency found that Fe / PDA 0.25 The / C composite catalyst is about 5 times higher than that of pure iron, which greatly accelerates the degradation rate. When the proportion of polydopamine continues to increase, the electron transfer efficiency of the catalyst is almost saturated.

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Abstract

The invention discloses an iron/polydopamine/carbon composite catalyst with double properties of reduction and oxidation as well as a preparation method and application of the iron/polydopamine/carbon composite catalyst, and belongs to the technical field of environmental functional materials and catalysis. The composite material comprises a Fe inner core, a polydopamine layer and a carbon layer, the Fe inner core is coated with the polydopamine layer, and the polydopamine layer is coated with the carbon layer; the mass of the carbon layer is M3, the mass of the polydopamine layer is M2, the mass of the Fe core is M1, and the ratio of (1.59 M < 3 > + M2): M1 is 0.05-1; and the Fe core comprises zero-valent micron or nano iron. The Fe < 3 + > on the iron surface can be reduced, the high reducibility of the iron-based material is kept, and meanwhile, the transfer efficiency of electrons transferred from the material to target pollutants can be improved, so that the reduction and catalytic performance of the material is improved.

Description

technical field [0001] The invention belongs to the technical field of environmental functional materials and catalysis, and more specifically relates to an iron / polydopamine / carbon composite catalyst with both reduction and oxidation properties and its preparation method and application. Background technique [0002] Zero valent iron (ZVI) is recognized as an effective reduction catalyst for the remediation of organic chlorides in water and soil, and ZVI can also be used as a persulfate (PS) activator to generate SO4 ·- and ·OH (oxidation-reduction potentials are 2.5V-3.1V and 1.9V-2.7V, respectively) are used for oxidative degradation. Therefore, bifunctional ZVI is endowed as a repair material for reduction-oxidation coupled catalytic removal of chlorinated aromatics. [0003] ZVI has been used as an electron donor in various restoration applications due to its effective and economical practicability, however, some technical hurdles still need to be resolved to achieve e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745C02F1/70C02F1/72C09K17/02C09K17/04C02F101/30C02F101/36
CPCB01J23/745B01J35/0073C02F1/70C02F1/705C02F1/722C02F1/725C09K17/04C09K17/02C02F2101/30C02F2101/36
Inventor 高士祥胡建华董仕鹏
Owner NANJING UNIV
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