Fe2O3/TiO2 composite photocatalytic film layer with three-dimensional nano sheet structure and preparation method and application thereof

A technology of composite photocatalysis and sheet structure, which is applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve good industrial application prospects, wide range of photoresponse, The effect of high specific surface area

Active Publication Date: 2020-02-11

SOUTH CHINA UNIV OF TECH

9 Cites 1 Cited by

AI-Extracted Technical Summary

Problems solved by technology

And it solves the problem of photocatalytic recycling, which pr...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Abstract

The invention discloses a Fe2O3/TiO2 composite photocatalytic film layer with a three-dimensional nano sheet structure and a preparation method and application thereof. The preparation method comprises the following steps: (1) gradually polishing a titanium substrate to be smooth by using abrasive paper, and then carrying out ultrasonic cleaning; (2) preparing a reaction solution A by using sodiumphosphate, sodium tungstate, potassium ferrocyanide and deionized water; connecting the substrate treated in the step (1) to an anode of a direct-current power supply, taking a stainless steel sheetas a cathode, and carrying out plasma electrolytic oxidation treatment in the reaction solution A to prepare a porous Fe2O3/TiO2 composite film layer; and (3) preparing a reaction solution B by usingsodium hydroxide and deionized water; placing the composite film layer prepared in the step (2) in the reaction solution B for hydrothermal reaction to prepare the composite photocatalytic film layer.As a photocatalyst, the film layer is large in specific surface area and wide in light response range, thus has excellent photocatalytic effect.

Application Domain

Water/sewage treatment by irradiationWater treatment compounds +2

Technology Topic

Potassium ferrocyanidePhoto catalysis +15

Image

Examples

Experimental program(6)

Example Embodiment

[0025] Example 1

[0026] (1) Titanium substrate pretreatment: the titanium substrate is sequentially water-milled with 220#, 400#, 1000#, 2000#, 5000# sandpaper to a smooth surface, and then ultrasonically cleaned with absolute ethanol and distilled water;

[0027] (2) Preparation of plasma electrolytic oxidation carrier film: prepare electrolyte solution A containing 14 g/L sodium phosphate, 2 g/L sodium tungstate, 8 g/L potassium ferrocyanide and solvent distilled water; ) The pretreated substrate is connected to the anode of the DC power supply, and the stainless steel sheet is used as the cathode. Plasma electrolytic oxidation is performed in the reaction solution A. The reaction voltage is 360V and the reaction time is 15 minutes to obtain porous Fe 2 O 3 /TiO 2 Composite photocatalytic film;

[0028] (3) Hydrothermal treatment: prepare reaction solution B containing 0.5 M sodium hydroxide and deionized water; combine the porous Fe obtained in step (2) 2 O 3 /TiO 2 The film layer and the reaction solution B are put into the reactor together, and then reacted at 120℃ for 2h to obtain three-dimensional nano-sheet Fe 2 O 3 /TiO 2 Composite photocatalytic film, marked as Fe 2 O 3 /TiO 2 -1, the surface of the film grows a relatively small nano-sheet structure (see figure 1 In a), it has absorbance in the visible light wavelength range (wavelength greater than 400nm) and has visible light activity (see figure 2 ).

[0029] (4) Photocatalysis test: the three-dimensional nano flake Fe 2 O 3 /TiO 2 The composite photocatalytic film and 50ml of methylene blue solution with a concentration of 30mg/L were put into a photocatalytic glass jacketed reactor, and magnetically stirred for 30min in the dark to reach adsorption-desorption equilibrium, and then a xenon lamp with an electric power of 300W As a light source, it is irradiated from top to bottom for catalytic photolysis. Samples are taken every 30 minutes and reacted for 3 hours. The degradation rate of methylene blue reaches 67.10% (see image 3 ).

Example Embodiment

[0030] Example 2

[0031] (1) Titanium substrate pretreatment: the titanium substrate is sequentially water-milled with 220#, 400#, 1000#, 2000#, 5000# sandpaper to a smooth surface, and then ultrasonically cleaned with absolute ethanol and distilled water;

[0032] (2) Preparation of plasma electrolytic oxidation carrier film: prepare electrolyte solution A containing 14 g/L sodium phosphate, 2 g/L sodium tungstate, 8 g/L potassium ferrocyanide and solvent distilled water; ) The pretreated substrate is connected to the anode of the DC power supply, and the stainless steel sheet is used as the cathode. Plasma electrolytic oxidation is performed in the reaction solution A, the reaction voltage is 360V, and the reaction time is 15 minutes to obtain porous Fe 2 O 3 /TiO 2 Composite photocatalytic film;

[0033] (3) Hydrothermal treatment: prepare reaction solution B containing 0.5 M sodium hydroxide and deionized water; combine the porous Fe obtained in step (2) 2 O 3 /TiO 2 The film layer and reaction solution B are put into the reactor together, and then reacted at 140℃ for 2h to obtain three-dimensional nano-sheet Fe 2 O 3 /TiO 2 Composite photocatalytic film, marked as Fe 2 O 3 /TiO 2 -2, the nano flakes grown on the surface of the film gradually become larger, covering the entire film (see figure 1 In b), it has absorbance in the visible light wavelength range (wavelength greater than 400nm) and has visible light activity (see figure 2 ).

[0034] (4) Photocatalysis test: the three-dimensional nano flake Fe 2 O 3 /TiO 2 The composite photocatalytic film and 50ml of methylene blue solution with a concentration of 30mg/L were put into the photocatalytic reactor together, and magnetically stirred for 30min in the dark to reach the adsorption-desorption equilibrium, and then a xenon lamp with an electric power of 300W was used as the light source. While under irradiation for catalytic photolysis, samples were taken every 30 minutes and reacted for 3 hours. The degradation rate of methylene blue reached 75.90% (see image 3 ).

Example Embodiment

[0035] Example 3

[0036] (1) Titanium substrate pretreatment: the titanium substrate is sequentially water-milled with 220#, 400#, 1000#, 2000#, 5000# sandpaper to a smooth surface, and then ultrasonically cleaned with absolute ethanol and distilled water;

[0037] (2) Preparation of plasma electrolytic oxidation carrier film: prepare electrolyte solution A containing 14 g/L sodium phosphate, 2 g/L sodium tungstate, 8 g/L potassium ferrocyanide and solvent distilled water; ) The pretreated substrate is connected to the anode of the DC power supply, and the stainless steel sheet is used as the cathode. Plasma electrolytic oxidation is performed in the reaction solution A, the reaction voltage is 360V, and the reaction time is 15 minutes to obtain porous Fe 2 O 3 /TiO 2 Composite photocatalytic film;

[0038] (3) Hydrothermal treatment: prepare reaction solution B containing 0.5 M sodium hydroxide and deionized water; combine the porous Fe obtained in step (2) 2 O 3 /TiO 2 The film layer and reaction solution B are put into the reactor together, and then reacted at 160℃ for 2h to obtain three-dimensional nano-sheet Fe 2 O 3 /TiO 2 Composite photocatalytic film, marked as Fe 2 O 3 /TiO 2 -3, the nanosheets grown under this condition are larger and tend to cover the pores of the film (see figure 1 In c), it has absorbance in the visible light wavelength range (wavelength greater than 400nm) and has visible light activity (see figure 2 ).

[0039] (4) Photocatalysis test: the three-dimensional nano flake Fe 2 O 3 /TiO 2 The composite photocatalytic film and 50ml of methylene blue solution with a concentration of 30mg/L were put into the photocatalytic reactor together, and magnetically stirred for 30min in the dark to reach the adsorption-desorption equilibrium, and then a xenon lamp with an electric power of 300W was used as the light source. While under irradiation for catalytic photolysis, samples were taken every 30 minutes and reacted for 3 hours. The degradation rate of methylene blue reached 81.30% (see image 3 ).

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Login to view more

PUM

Property	Measurement	Unit
Concentration	30.0	mg/l
Concentration	30.0	m
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Login to view more

Classification and recommendation of technical efficacy words

High specific surface area
Wide photoresponse range

People also interested in

Practical Low comprehensive cost No environmental pollution Good prospects for industrial application Sodium phosphates Electrolysis Emery paper Sheet structure Thermal reaction Hydrothermal reaction Water contaminants Metal/metal-oxides/metal-hydroxide catalysts

Fe2O3/TiO2 composite photocatalytic film layer with three-dimensional nano sheet structure and preparation method and application thereof

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

Similar technology patents

Lightweight slow-release nitrogen and phosphorus removal material and preparation method and application thereof

Preparation method for dandelion-shaped core-shell structure Au@ZnO heterojunction catalyst

Fixed enzyme membrane reactor, preparation thereof and method for producing biological diesel oil by the same

Preparation method of three-dimensional-structure graphene/carbon nanotube hybrid carbon material

Preparation method of graphene hydrogel and application of the graphene hydrogel

Classification and recommendation of technical efficacy words

Sorbent comprising activated carbon, process for making same and use thereof

Preparation method of titanium-based titanium dioxide nanotube stannic oxide electrode

Metal organic skeleton structure material load platinum catalyst, as well as preparation method and application thereof

Method for synthesizing phosphorus-silicate-aluminum molecular sieve with metal-amine-complex as template

Process and equipment for removing CO2 in flue gas by utilizing amine solid adsorbent

Nitrile substituted quinacridone compounds and application thereof in organic solar cell

Diatomite-surface cobalt doped nano pyrite composite material and preparation and application thereof

Photosensitive response hydrogel and application thereof in preparation of photochromic soft material

Ternary composite antibacterial material with photodynamic-photothermal synergistic antibacterial activity as well as preparation method and application thereof

People also interested in