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A method for preparing photocatalytic materials by layer-by-layer self-assembly

A photocatalytic material and layer-by-layer self-assembly technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve problems such as difficult loading and difficult recycling, Achieve the effects of short time period, low cost and mild reaction conditions

Active Publication Date: 2020-04-17
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the problem that existing photocatalytic materials are difficult to recycle and load, and are difficult to be applied, the present invention provides a method for preparing photocatalytic materials by layer-by-layer self-assembly. The method uses polyallylamine hydrochloride Salt and two-dimensional titania nanosheets were used as the basic building units, and polyelectrolyte-titanium oxide nanosheet composite multilayer films were prepared by layer-by-layer self-assembly and photochemical cross-linking methods, and the surface was in situ reduced with chloroauric acid to obtain the size Controllable and uniformly loaded composite material, the preparation process of the present invention is simple, the time period is short, the composite multilayer film grows uniformly, and batch preparation can be realized; most of the photocatalytic materials are powders at present, which are difficult to recycle, and the present invention prepares The photocatalytic material is a thin film material, which is more convenient to recycle, greatly reduces the pollution to the environment, is green and environmentally friendly, and meets the requirements of sustainable development

Method used

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  • A method for preparing photocatalytic materials by layer-by-layer self-assembly
  • A method for preparing photocatalytic materials by layer-by-layer self-assembly
  • A method for preparing photocatalytic materials by layer-by-layer self-assembly

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Experimental program
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Effect test

Embodiment 1

[0026] a. Soak the quartz slice in 100mL mixed solution of 30% hydrogen peroxide and 98% concentrated sulfuric acid with a volume ratio of 3:7 for 30min, then rinse with deionized water, and dry the quartz slice with nitrogen;

[0027] b prepare 20 mL of polyallylamine hydrochloride solution with pH 10 of 1 mg / mL and 20 mL of two-dimensional titanium oxide nanosheet solution with pH of 9 at 0.8 mg / mL;

[0028] c. Soak the quartz substrate obtained after the treatment in step a in the polyallylamine hydrochloride solution and the two-dimensional titanium oxide nanosheet solution in turn, and soak in the two solutions for 15 minutes respectively. After each soaking, use Rinse with deionized water 3 times and blow dry with nitrogen gas, and each cycle of this cycle is to grow a double layer;

[0029] d Repeat step c to grow and obtain 5.5 layers of polyelectrolyte-titanium oxide nanosheets;

[0030] e Immerse the multilayer film obtained in step d in 20 mL of 4,4'-diazidodistyry...

Embodiment 2

[0035] a Soak the quartz slice in 100mL mixed solution of 30% hydrogen peroxide and 98% concentrated sulfuric acid with a volume ratio of 3:7 for 1min, then rinse with deionized water, and dry the quartz slice with nitrogen;

[0036] b prepare 20 mL of polyallylamine hydrochloride solution with pH 10 of 0.5 mg / mL and 20 mL of two-dimensional titanium oxide nanosheet solution with pH 9 of 0.5 mg / mL;

[0037] c. Soak the quartz substrate obtained after the treatment in step a in the polyallylamine hydrochloride solution and the two-dimensional titanium oxide nanosheet solution in turn, and soak in the two solutions for 15 minutes respectively. After each soaking, use Rinse with deionized water 3 times and blow dry with nitrogen gas, and each cycle of this cycle is to grow a double layer;

[0038] d Repeat step c to grow and obtain 6 layers of polyelectrolyte-titanium oxide nanosheets;

[0039] e Immerse the multilayer film obtained in step d in 20 mL of 4 mg / mL pH 3.8 sodium 4,...

Embodiment 3

[0044] a Soak the quartz slice in 100mL mixed solution of 30% hydrogen peroxide and 98% concentrated sulfuric acid with a volume ratio of 3:7 for 1min, then rinse with deionized water, and dry the quartz slice with nitrogen;

[0045] b prepare 20 mL of polyallylamine hydrochloride solution 2 mg / mL pH 10 and 2 mg / mL pH 9 two-dimensional titanium oxide nanosheet solution 20 mL;

[0046] c. Soak the quartz substrate obtained after the treatment in step a in the polyallylamine hydrochloride solution and the two-dimensional titanium oxide nanosheet solution in turn, and soak in the two solutions for 15 minutes respectively. After each soaking, use Rinse with deionized water 3 times and blow dry with nitrogen gas, and each cycle of this cycle is to grow a double layer;

[0047] d Repeat step c to grow and obtain 4 layers of polyelectrolyte-titanium oxide nanosheets;

[0048] e Immerse the multilayer film obtained in step d in 20 mL of 4,4'-diazidedistyryl-2,2'-sodium disulfonate so...

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Abstract

The invention discloses a method for preparing a photocatalytic material by utilizing layer-by-layer self-assembling. The method comprises the following steps: (1) establishing a multi-layer film of a polyelectrolyte / two-dimensional titanium oxide nanosheet by a layer-by-layer self-assembling technology and by taking poly allyamine hydrochloride as a polyelectrolyte constructing element and a two-dimensional titanium oxide nanosheet as an another constructing element; and (2) performing in-situ reduction on gold nanoparticles by a permeating photochemical crosslinking method to prepare the photocatalytic material. The method is simple in preparation process, short in time cycle and environment-friendly, the composite multi-layer film grows uniformly, and batched preparation can be realized.

Description

technical field [0001] The invention belongs to the technical field of material chemical layer-by-layer self-assembly preparation and the technical field of photocatalytic materials, and specifically relates to a method for preparing photocatalytic materials by layer-by-layer self-assembly, and more specifically relates to a method for preparing polyelectrolyte-titanium oxide by layer-by-layer self-assembly The nanosheet-gold nanoparticle approach. Background technique [0002] Layer-by-layer self-assembly is a technology that utilizes substrates to alternately adsorb from two or more polymer solutions and complement other multivalent substances. Because it can generate functional films on solid surfaces, it can be used in biosensing, The application of drugs, gene delivery, regenerative medicine, tissue engineering and bionic medicine has been recognized. Layer-by-layer self-assembly technology has been developed in the past few decades because of its controllable compositi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/38
CPCB01J31/06B01J31/38B01J35/004
Inventor 张以河安琪张茜孟子霖
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)