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Carbon nitride/polydopamine/silver phosphate superlattice nano-catalyst as well as preparation method and application thereof

A nano-catalyst, polydopamine technology, applied in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the difficulties and inappropriate biomedical applications of catalyst materials , dispersibility, poor stability and other problems, to achieve the effect of enhancing the utilization of visible light, improving the utilization of visible light, and accelerating the separation rate of electrons and holes

Active Publication Date: 2021-12-07
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing form Ag 3 PO 4 / g-C3N4 composite catalysts are not suitable for biomedical applications
This is because (1) the current Ag 3 PO 4 / g-C3N4 semiconductor catalyst has poor dispersion and stability in aqueous phase and poor biocompatibility
(2) The catalytic activity is still limited, which makes it necessary to have a high dose in the biomedical field to ensure that an effective amount of ROS and oxygen can be generated at the lesion tissue site
[0004] In conclusion, the existing g-C3N4 / Ag 3 PO 4 Catalyst materials are difficult to apply in biomedicine

Method used

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  • Carbon nitride/polydopamine/silver phosphate superlattice nano-catalyst as well as preparation method and application thereof
  • Carbon nitride/polydopamine/silver phosphate superlattice nano-catalyst as well as preparation method and application thereof
  • Carbon nitride/polydopamine/silver phosphate superlattice nano-catalyst as well as preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0040] Refer to the process figure 2 , this embodiment includes the following steps:

[0041] Step 1. Dissolve 200g of urea in double-distilled water and set the volume to 625mL, sonicate at 30kHz for 8 minutes to make it into a uniform urea stock solution; dissolve 0.1g KOH in 75mL of double-distilled water, and sonicate at 30kHz for 2min to form a homogeneous potassium hydroxide stock solution; take 21mL Add 2mL of KOH stock solution to the urea stock solution, put it into a 50mL polytetrafluoroethylene-lined autoclave, and react at 120°C for 6h; take out the polytetrafluoroethylene liner and pre-freeze at -20°C for 12h, and transfer to- Pre-freeze at 80°C for 24 hours, and then freeze-dry in a freeze dryer to obtain a spongy urea freeze-dried powder;

[0042] Step 2: Take 3g of the spongy urea freeze-dried powder described in step 1, place it in a ceramic crucible, cover it and wrap it with double-layer tin foil; preheat the muffle furnace to 550°C, and then put it into t...

Embodiment 2

[0052] This embodiment includes the following steps:

[0053] Step 1. Dissolve 200g of urea in double distilled water and set the volume to 625mL, and ultrasonicate at 30kHz for 8 minutes to make it a uniform urea stock solution; dissolve 0.05g KOH in 75mL of double distilled water, and ultrasonically at 30kHz for 2min to form a uniform potassium hydroxide stock solution; take 21mL Add 0.5mL KOH stock solution to the urea stock solution, put it into a 50mL polytetrafluoroethylene-lined autoclave, and react at 120°C for 6h; take out the polytetrafluoroethylene liner and pre-freeze at -20°C for 12h, transfer to Pre-freeze at -80°C for 24 hours, and then freeze-dry in a freeze dryer to obtain a spongy urea freeze-dried powder;

[0054] Step 2: Take 3g of the spongy urea freeze-dried powder described in step 1, place it in a ceramic crucible, cover it and wrap it with double-layer tin foil; preheat the muffle furnace to 550°C, and then put it into the preheated muffle furnace Put...

Embodiment 3

[0058] This embodiment includes the following steps:

[0059] Step 1. Dissolve 100g of urea in double-distilled water and set the volume to 625mL, sonicate at 30kHz for 8 minutes to make it into a homogeneous urea stock solution; dissolve 0.05g KOH in 75mL of double-distilled water, and sonicate at 30kHz for 2min to form a homogeneous potassium hydroxide stock solution; take 21mL Add 1mL of KOH stock solution to urea stock solution, put it into a 50mL polytetrafluoroethylene-lined autoclave, and react at 100°C for 4h; take out the polytetrafluoroethylene liner and pre-freeze at -20°C for 12h, transfer to- Pre-freeze at 80°C for 24 hours, and then freeze-dry in a freeze dryer to obtain a spongy urea freeze-dried powder;

[0060] Step 2: Take 2 g of the spongy urea freeze-dried powder described in Step 1, place it in a ceramic crucible, cover it and wrap it with double-layer tin foil; preheat the muffle furnace to 500 ° C, and then put it into the preheated muffle furnace Put i...

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Abstract

The invention discloses a preparation method of a carbon nitride / polydopamine / silver phosphate superlattice nano-catalyst. The method comprises the following steps: preparing urea and potassium hydroxide pre-reaction liquid, thermally decomposing part of the urea and potassium hydroxide pre-reaction liquid, and performing freeze-drying to obtain a spongy freeze-dried powder; thermally polymerizing the freeze-dried powder to obtain carbon nitride nano gauze, and performing washing and collecting; pre-reacting the carbon nitride nano gauze and dopamine hydrochloride under the conditions of room temperature and darkness, and then performing reaction under the conditions of illumination, oxygen and higher temperature; and finally, depositing silver phosphate in situ through electrostatic adsorption and ion exchange. The g-C3N4 nano gauze with high catalytic activity is prepared by combining a freezing-gas pore forming method with a controllable potassium ion doping method, and the carbon nitride / polydopamine / silver phosphate hybrid nano catalyst with a superlattice structure is prepared through controllable supramolecular assembly. The prepared nano-catalyst has excellent biocompatibility, and has a wide application prospect in the aspects of in-situ ROS generation and in-situ oxygen supply in a living body.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic nanomaterial preparation, and in particular relates to a carbon nitride / polydopamine / silver phosphate superlattice nanocatalyst, a preparation method and an application. Background technique [0002] Graphitic carbon nitride (Graphitic carbon nitride, g-C3N4) is a highly biocompatible, non-toxic (oral half-lethal dose: 5000mg / kg) visible light active polymer semiconductor. g-C3N4, with a bandwidth of about 2.7ev, can theoretically absorb sunlight with a wavelength of less than 460nm to reduce and oxidize water, thereby generating reactive oxygen species (ROS) and oxygen. However, the ROS generation activity and oxygen evolution reaction (OER) activity of pristine g-C3N4 are limited due to the small specific surface area, poor electron transfer capability, and serious photogenerated carrier recombination of bulk g-C3N4. [0003] Studies have shown that: it is related to another Ag 3 PO 4 ...

Claims

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Application Information

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IPC IPC(8): B01J31/06C01B3/04B01J35/10A61K31/785A61K33/42A61K33/44A61P17/02
CPCB01J31/06C01B3/042A61K31/785A61K33/42A61K33/44A61P17/02B01J35/61B01J35/39A61K2300/00Y02E60/36
Inventor 范代娣申世红马晓轩
Owner NORTHWEST UNIV