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Application of iron-base Fe2O3 nanotube to visible light catalytic dye wastewater degradation

A dye wastewater, catalytic degradation technology, applied in the fields of material chemistry, environmental chemistry and photocatalysis, can solve the problems of low yield, poor conductivity, general photocatalytic performance, etc., and achieve the effects of low cost and simple preparation process

Inactive Publication Date: 2013-06-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Titanium dioxide, as a common photocatalyst, was well known as early as the 1950s. Since Japanese scientist Fujishima Akira reported on Nature in 1972 that titanium dioxide was used as an electrode to carry out the photolysis effect of water, the photocatalyst of titanium dioxide has caused In the 1980s, around the 1980s, the photocatalytic oxidation of organic compounds by titanium dioxide was focused on the decomposition of organic matter, but these studies were not able to achieve a wide range of applications. The main reason is that the band gap of titanium dioxide is 3.2ev , can only be excited by near-ultraviolet rays below 380nm. Although the holes and hydroxyl radicals generated by ultraviolet light excitation of titanium dioxide have strong oxidative properties, they can oxidize and decompose most organic pollutants into inorganic products such as carbon dioxide and water. However, the distribution The light energy in the living space itself is very thin, and only using the ultraviolet band in natural light has little effect; if artificial light sources are used, there will be energy consumption problems due to the use of light sources
[0005] Among various solid metal oxides, Fe 2 o 3 The bandgap width of Fe is only 2.1ev, it can absorb 600nm visible light, and the cost is low; but Fe 2 o 3 The disadvantage is poor conductivity, high recombination rate of electrons and holes, and general photocatalytic performance, which limits its application

Method used

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  • Application of iron-base Fe2O3 nanotube to visible light catalytic dye wastewater degradation
  • Application of iron-base Fe2O3 nanotube to visible light catalytic dye wastewater degradation
  • Application of iron-base Fe2O3 nanotube to visible light catalytic dye wastewater degradation

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Experimental program
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Effect test

Embodiment 1

[0017] Use 0.25mm iron sheet (99.9%) in sequence with 120 # , 320 # and 500 # Grinding with sandpaper, further polishing with metallographic sandpaper to make the surface of the substrate smooth, then ultrasonically cleaning in distilled water and acetone for 20 min, and cleaning with twice distilled water. The composition of anodizing electrolyte is 0.3wt% NaF, 0.5wt% HF, 3%vol H 2 O, in the mixed solution with ethylene glycol as the solvent, the iron sheet is used as the working electrode, the platinum sheet is used as the counter electrode, the voltage at both ends is controlled to be constant at 50V, and the reaction temperature is constant at 60°C to perform electrochemical anodic oxidation treatment for 10 minutes. That is, to obtain ordered Fe on the iron-based surface 2 o 3 The nanotube array electrode was immediately ultrasonically cleaned in isopropanol to remove residues on the surface of the electrode, and the prepared electrode was heat-treated in a tube furna...

Embodiment 2

[0021] Using the prepared iron-based Fe 2 o 3 Nanotube Photocatalytic Oxidative Degradation of the Dye Methyl Orange.

[0022] The photocatalytic degradation was carried out in a circular optical transparent chemical reaction cell, the temperature of the reaction system was room temperature, and the reaction volume was 100ml. Use the prepared electrode as a photocatalyst to immerse in methyl orange wastewater, with an immersion area of ​​6 cm 2 , using a visible light source with a wavelength greater than 420nm, with an optical energy density of 200mW / cm 2 ,; In addition, a biased photocatalytic reaction was performed to prepare the obtained iron-based Fe 2 o 3 The nanotube electrode is the working electrode, and the platinum electrode is the counter electrode. The degraded methyl orange wastewater contains 0.05mol L -1 Na 2 SO 4 . Samples were taken at different times during the degradation reaction for analysis. The concentration at different times along with the ...

Embodiment 3

[0024] Using the prepared iron-based Fe 2 o 3 Nanotube photocatalytic oxidative degradation of the dye methylene blue.

[0025] The photocatalytic degradation was carried out in a circular optical transparent chemical reaction cell, the temperature of the reaction system was room temperature, and the reaction volume was 100ml. Use the prepared electrode as a photocatalyst to immerse in methylene blue wastewater, and the immersion area is 6cm 2 , using a visible light source with a wavelength greater than 420nm, with an optical energy density of 200mW / cm 2 ,; In addition, a biased photocatalytic reaction was performed to prepare the obtained iron-based Fe 2 o 3 The nanotube electrode is the working electrode, and the platinum electrode is the counter electrode. The degraded methyl orange wastewater contains 0.05mol L -1 Na 2 SO 4 . Samples were taken at different times during the degradation reaction for analysis. The concentration at different times along with the r...

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Abstract

The invention relates to an application of an iron-base Fe2O3 nanotube to visible light catalytic dye wastewater degradation, which concretely comprises the following steps of: using the iron-base Fe2O3 nanotube as an electrode; placing the iron-base Fe2O3 nanotube in a light-transmission chemical reaction container containing the dye wastewater; using the iron-base Fe2O3 nanotube electrode as a work electrode; using a platinum sheet as a counter electrode; applying a 0.4V to 0.6V positive bias to the work electrode; and using a visible light source for carrying out photocatalytic degradationreaction. Compared with the existing photocatalytic technology, the application has the characteristic that the visible light source can be directly utilized for carrying out efficient photocatalysis, and the application has the advantages that the material preparation process is simple, the cost is low, the photocatalysis effect is good, and the like.

Description

technical field [0001] The invention belongs to the technical fields of material chemistry, environmental chemistry and photocatalysis, and relates to an iron-based Fe catalyst used to catalyze pollutants with visible light. 2 o 3 The nanotube vertical array and its preparation method also relate to a technical method for its application in visible light catalytic oxidation degradation of organic pollutants in wastewater. Background technique [0002] The photocatalytic environmental pollutant treatment technology that has emerged in recent years is a new type of pollutant control technology. This technology combines photocatalysts and pollutants, uses light energy as a driving force, and achieves the degradation and removal of pollutants. Its biggest feature is The process and operation are simple and the process is controllable. The key element of the photocatalytic reaction is the photocatalyst. Titanium dioxide, as a common photocatalyst, was well known as early as th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/745C02F1/30C02F1/48C02F103/30
CPCY02W10/37
Inventor 赵国华张重宁雷燕竹
Owner TONGJI UNIV