a magnetic tio 2 (r) Composite photocatalyst and preparation method thereof

A magnetic and composite material technology, applied in the field of magnetic TiO2 composite photocatalyst and its preparation, can solve the problems of difficult to obtain magnetic composite photocatalyst, poor degradation effect of pollutants in water, poor thermal stability of magnetic matrix, etc., and achieve simple separation and recovery Reuse, improve photocatalytic performance, and have the effect of magnetic response

Active Publication Date: 2021-06-01
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nano-TiO 2 Although the photocatalytic activity is good, but considering its poor separation and sedimentation performance, the researchers proposed to make TiO 2 Composite method with magnetic material to prepare magnetic TiO 2 Composite photocatalysts for simple separation and recycling of photocatalysts
Currently, the commonly reported magnetic TiO 2 The composite photocatalyst is mainly through the anatase phase TiO 2 (TiO 2 (A)) dispersed in Fe 3 o 4 or gamma -Fe 2 o 3 and other magnetic particles, but in this type of magnetic TiO 2 There are three major problems in the preparation and application of composite photocatalysts: one is that the magnetic particles are mixed with TiO 2 Agglomeration is easy to occur during the recombination process, and it is difficult to obtain a magnetic composite photocatalyst with uniform particle size; second, the thermal stability of the magnetic matrix is ​​poor, and it is difficult to maintain magnetism during heat treatment; "Dissolution" phenomenon, which makes the degradation effect of pollutants in water poor

Method used

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  • a magnetic tio <sub>2</sub> (r) Composite photocatalyst and preparation method thereof
  • a magnetic tio <sub>2</sub> (r) Composite photocatalyst and preparation method thereof
  • a magnetic tio <sub>2</sub> (r) Composite photocatalyst and preparation method thereof

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Embodiment 1

[0027] A kind of magnetic TiO provided by this embodiment 2 (R) the preparation method of composite photocatalyst, comprises the following steps:

[0028] (1) Preparation of MIL-88A

[0029] Weigh 1.2626 g FeCl 3 ·6H 2 O in a 100 mL beaker, add 40 mL of distilled water, stir until dissolved; then weigh 0.9296 g of fumaric acid and add to FeCl 3 In the aqueous solution, stirred for 1 h, transferred to a 100 mL reactor, and reacted at 65 °C for 12 h; after the temperature dropped to room temperature, the obtained crystals were filtered out, washed alternately with ethanol and distilled water for 3 to 5 times and dried to obtain MIL-88A.

[0030] (2) Magnetic TiO 2 (R) Preparation of Composite Photocatalyst

[0031] Weigh 0.4 g of MIL-88A into a 500 mL beaker, add 60 mL of distilled water, sonicate for 1 h, add 960 μL of polyacrylic acid (PAA) aqueous solution with a concentration of 0.1 g / mL and 1440 μL of NH 3 ·H 2 O (2mol / L), continue to stir for 30 min, add 160 mL of ...

Embodiment 2

[0033] A kind of magnetic TiO provided by this embodiment 2 (R) the preparation method of composite photocatalyst, the difference with embodiment 1 is:

[0034] The concentration of PAA described in step (2) was 0.2 g / mL.

Embodiment 3

[0036] A kind of magnetic TiO provided by this embodiment 2 (R) the preparation method of composite photocatalyst, the difference with embodiment 1 is:

[0037] The precursor calcination time in step (2) is 3 h.

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Abstract

The invention discloses a magnetic TiO 2 (R) Composite materials and their preparation methods and applications. The magnetic composite photocatalyst consists of rutile phase TiO 2 (TiO 2 (R)) cladding gamma ‑Fe 2 o 3 / FeTiO 3 Surface, and a small amount of carbon (C) dispersed in the material. The preparation method includes firstly preparing MIL-88A by hydrothermal method, then coating polyacrylic acid (PAA) on its surface and compounding it with a titanium dioxide precursor, and finally calcining at high temperature under an inert atmosphere to obtain a magnetic composite photocatalyst. The magnetic composite photocatalyst of the present invention can be applied to the photocatalytic degradation of rhodamine B (RhB) wastewater, and has the advantages of unique morphology, uniform particle size, excellent magnetic recovery performance, stable photocatalytic performance and high degradation efficiency for RhB.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental photocatalytic materials, in particular to a magnetic TiO 2 (R) Composite photocatalyst and its preparation method and application. Background technique [0002] TiO 2 It is the most widely studied and typical photocatalytic material, which has excellent photocatalytic degradation of organic matter under the condition of ultraviolet light irradiation, and has been widely used. Nano-TiO 2 Although the photocatalytic activity is good, but considering its poor separation and sedimentation performance, the researchers proposed to make TiO 2 Composite method with magnetic material to prepare magnetic TiO 2 Composite photocatalysts to realize simple separation and recycling of photocatalysts. Currently, the commonly reported magnetic TiO 2 The composite photocatalyst is mainly through the anatase phase TiO 2 (TiO 2 (A)) dispersed in Fe 3 o 4 or gamma -Fe 2 o 3 and other...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/745C02F1/32C02F101/30
CPCB01J23/002B01J23/745B01J35/0033B01J35/004C02F1/32C02F2101/308C02F2305/10
Inventor 李小娟刘政霖廖凤珍叶兰妹刘明华王永净王永好
Owner FUZHOU UNIV
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