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a fe 3 o 4 @c@tio 2 A Simple Preparation Method of Magnetic Separation Photocatalyst

A photocatalyst and magnetic separation technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve bad heterojunction, electron-hole recombination photodissolution The probability of increasing and other issues, to achieve the effect of low equipment requirements, good visible light photocatalytic activity, fast magnetic response speed

Inactive Publication Date: 2019-08-23
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But due to TiO 2 Direct contact with the magnetic carrier material usually creates an undesirable heterojunction, leading to an increased chance of electron-hole recombination and photodissolution

Method used

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  • a fe <sub>3</sub> o <sub>4</sub> @c@tio <sub>2</sub> A Simple Preparation Method of Magnetic Separation Photocatalyst
  • a fe <sub>3</sub> o <sub>4</sub> @c@tio <sub>2</sub> A Simple Preparation Method of Magnetic Separation Photocatalyst
  • a fe <sub>3</sub> o <sub>4</sub> @c@tio <sub>2</sub> A Simple Preparation Method of Magnetic Separation Photocatalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Magnetically separable Fe 3 o 4 @C@TiO 2 The preparation process of photocatalyst is as follows: 0.1g CTAB and 0.108g FeCl 3 ·6H 2 O (0.4 mmol) was dissolved in 4 mL of water. After fully dissolved, centrifuge for 3 minutes and discard the sediment. The clarified solution was slowly magnetically stirred at 85°C for 12h. centrifuged (1000rpm 3min), washed 3-5 times with water to obtain β-FeOOH nanorods. Subsequently, 0.03 g of β-FeOOH nanorods were ultrasonically dispersed in 20 mL of water to form a dispersion. Add 1mL of 0.1M PAA solution to the above 20mL dispersion liquid, stir and disperse at a medium speed for 12h, centrifuge at 1000rpm to recover the solid and redisperse it in 28mL water, add resorcinol (R) solution (0.05g resorcinol dissolved in 1ml water) and 70 μL of formaldehyde (F) solution, stirred for 5 min, added dropwise 1 mL of 28% ammonia water at a constant speed, and reacted for 12 h at room temperature under magnetic stirring. The obtained pr...

Embodiment 2

[0042] In order to examine the effect of different calcination temperatures on Fe 3 o 4 @C@TiO 2 The influence of magnetic separation photocatalyst preparation and photocatalytic performance, in addition to calcination temperature, other reaction conditions such as the concentration of FeOOH template dispersion (1.5mg / mL) and calcination gas environment use N 2 Equally identical with embodiment 1, result is as image 3 , 4 c, e and Figure 9 As shown in A and C, at 400°C and 550°C, N 2 The sample Fe obtained by calcination in the atmosphere 3 o 4 @C@TiO 2 Both have significant Fe 3 o 4 、TiO 2 The characteristic diffraction peaks, and their UV-Vis diffuse reflectance spectra have strong absorption peaks in the range of 200-800nm. After the photocatalytic degradation of Figure 9A at a calcination temperature of 400 °C, the peak value in the entire ultraviolet-visible light range decreased slightly, indicating that a small amount of methyl orange was degraded. Figure...

Embodiment 3

[0045] In order to examine the effect of the calcination gas environment on Fe 3 o 4 @C@TiO 2 The influence of magnetic separation photocatalyst preparation and performance, except the gas environment of calcination, other reaction conditions such as the concentration (1.5mg / mL) of FeOOH template dispersion liquid and calcination temperature etc. are all identical with embodiment 1, the result is as follows image 3 , 4 Shown in b. Fe was not observed when the calcination was carried out in a non-inert gas 3 o 4 The characteristic diffraction peaks of 2 Can't get Fe 3 o 4 @C@TiO 2 , and FeOOH can be successfully reduced to Fe under nitrogen atmosphere 3 o 4 , and b is similar to a, with a strong absorption peak in the range of 200-400nm, but a weak absorption peak in the range of 400-800nm, indicating that b also only responds to ultraviolet light and has no response to visible light.

[0046] Calcination gas environment on Fe 3 o 4 @C@TiO 2 Magnetic separation T...

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Abstract

The invention relates to a simple preparation method for a Fe3O4@C@TiO2 magnetic separation photocatalyst. The method includes steps: 1) taking beta-FeOOH nanorods, and dispersing into water to form dispersion liquid; 2) adopting resorcinol and formaldehyde for synthesizing FeOOH@RF core-shell nanorods, and dispersing into ethyl alcohol to form dispersion liquid; 3) adding ethyl alcohol, CH3CN and ammonium hydroxide, and well stirring and mixing to form liquid A; taking ethyl alcohol and CH3CN again, well mixing, and adding TBOT to form liquid B; mixing for room-temperature reaction for a certain time to obtain the nanorods; 4) performing high-temperature calcinations to obtain the Fe3O4@C@TiO2 magnetic separation photocatalyst. The method has advantages that the magnetic-response recyclable Fe3O4@C@TiO2 visible-light nanometer photocatalyst is prepared according to the simple and mild method; the method is simple in operation and low in equipment requirement, and the prepared Fe3O4@C@TiO2 core-shell nanorods are high in dispersity and uniform in nanoparticle size.

Description

technical field [0001] The present invention relates to a kind of Fe 3 o 4 @C@TiO 2 A facile preparation method for magnetically separated photocatalysts. [0002] technical background [0003] Photocatalytic technology has the functions of purifying air, degrading wastewater and antibacterial, which has attracted the attention of scholars at home and abroad. However, powder photocatalysts have disadvantages such as difficult separation, easy agglomeration and non-recyclability. If the photocatalyst is immobilized, that is, the preparation of supported TiO 2 , can not only solve the problem of difficult separation and recovery, but also overcome the shortcoming of photocatalytic instability in suspended powder state. However, the TiO 2 It is made into a thin film and loaded on carriers such as glass, sand, and silicon wafers. Although it can be recycled, TiO 2 The catalytic activity will be affected accordingly. Therefore, it is necessary to keep the powder TiO 2 The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/745B01J35/00B82Y30/00B82Y40/00C02F1/30H01F1/00C02F101/38C02F101/34
CPCH01F1/0054B82Y30/00B82Y40/00C02F1/30B01J23/002B01J23/745C02F2305/10C02F2101/40C02F2101/38C02F2101/34B01J35/39B01J35/33B01J35/397B01J35/61
Inventor 王雪飞廖丹田都赵文杰曹雪竹余火根
Owner WUHAN UNIV OF TECH
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