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a mno 2 /bi 2 o 3 /mn x zn 1-x fe 2 o 4 Preparation method of composite magnetic photocatalyst

A photocatalyst and composite magnetic technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problem of low degradation rate, short cycle and low production cost and other problems, to achieve the effect of high photocatalytic activity, simple operation and less equipment

Inactive Publication Date: 2020-12-29
CHONGQING UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to Bi 2 o 3 Due to the difficulty of recovery and low degradation rate, it is proposed to use MnO 2 and Mn x Zn 1-x Fe 2 o 4 against Bi 2 o 3 modified to improve its catalytic activity, that is, a MnO 2 / Bi 2 o 3 / Mn x Zn 1-x Fe 2 o 4 A preparation method of a composite magnetic photocatalyst, the preparation method is simple, the production cost is low, the cycle is short, the catalytic activity is high, and it is convenient to separate and recover from the liquid phase suspension system by an external magnetic field, and the recovered catalyst still has a high catalytic activity Activity, which not only realizes resource reuse in a simple and efficient manner, but also avoids secondary pollution that may be caused by the catalyst

Method used

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  • a mno <sub>2</sub> /bi <sub>2</sub> o <sub>3</sub> /mn <sub>x</sub> zn <sub>1-x</sub> fe <sub>2</sub> o <sub>4</sub> Preparation method of composite magnetic photocatalyst
  • a mno <sub>2</sub> /bi <sub>2</sub> o <sub>3</sub> /mn <sub>x</sub> zn <sub>1-x</sub> fe <sub>2</sub> o <sub>4</sub> Preparation method of composite magnetic photocatalyst
  • a mno <sub>2</sub> /bi <sub>2</sub> o <sub>3</sub> /mn <sub>x</sub> zn <sub>1-x</sub> fe <sub>2</sub> o <sub>4</sub> Preparation method of composite magnetic photocatalyst

Examples

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Embodiment 1

[0023] A kind of MnO 2 / Bi 2 o 3 / Mn x Zn 1-x Fe 2 o 4 The preparation method of composite magnetic photocatalyst, concrete steps are as follows:

[0024] (1)Mn x Zn 1-x Fe 2 o 4 preparation of

[0025] Take by weighing 1.91g zinc sulfate, 2.77g manganese sulfate, 14.57g ferric chloride hexahydrate and dissolve with deionized water to obtain solution, then zinc sulfate solution and ferric chloride solution are added in manganese sulfate solution, fully stirred to obtain mixed solution, Weigh 16.40g of ammonium oxalate and dissolve it in deionized water to obtain an ammonium oxalate solution. Heat the mixed solution and the ammonium oxalate solution to 80°C in a water bath, then slowly add the mixed solution dropwise to the ammonium oxalate solution, and adjust the pH value with ammonia water To 7, the resulting oxalate precipitate was aged at room temperature for 12 h, filtered, the filter cake was washed with deionized water, then dried for 24 h, and finally placed...

Embodiment 2

[0031] A kind of MnO 2 / Bi 2 o 3 / Mn x Zn 1-x Fe 2 o 4 The preparation method of composite magnetic photocatalyst, concrete steps are as follows:

[0032] (1) With the step (1) of embodiment 1.

[0033] (2) With the step (2) of embodiment 1.

[0034] (3) MnO 2 / Bi 2 o 3 / Mn x Zn 1-x Fe 2 o 4 preparation of

[0035] Weigh 1.94g Bi(NO 3 ) 3 ·5H 2 O and 0.139g Mn x Zn 1-x Fe 2 o 4 Add to 10mL dilute HNO 3 , ultrasonically and mechanically stirred for 1 h to obtain suspension A; then weigh and theoretically generate Bi 2 o 3 MnO with a mass ratio of 10:100 2 Add to 40mL Na with a concentration of 0.6mol / L 2 CO 3 solution, ultrasonically and mechanically stirred for 1 h to obtain suspension B, and suspension A was added dropwise at a certain speed, mechanically stirred for 2 h, aged for 1 h, filtered, the filter cake was washed with deionized water, and then placed Dry in an oven at 60°C for 12h to obtain MnO 2 / Bi 2 o 3 / Mn x Zn 1-x Fe 2 o 4 Fina...

Embodiment 3

[0037] A kind of MnO 2 / Bi 2 o 3 / Mn x Zn 1-x Fe 2 o 4 The preparation method of composite magnetic photocatalyst, concrete steps are as follows:

[0038] (1) With the step (1) of embodiment 1.

[0039] (2) With the step (2) of embodiment 1.

[0040] (3) MnO 2 / Bi 2 o 3 / Mn x Zn 1-x Fe 2 o 4 preparation of

[0041] Weigh 1.94g Bi(NO 3 ) 3 ·5H2 O and 0.139g Mn x Zn 1-x Fe 2 o 4 Add to 10mL dilute HNO 3 , ultrasonically and mechanically stirred for 1 h to obtain suspension A; then weigh and theoretically generate Bi 2 o 3 MnO with a mass ratio of 15:100 2 Add to 40mL Na with a concentration of 0.6mol / L 2 CO 3 solution, ultrasonically and mechanically stirred for 1 h to obtain suspension B, and suspension A was added dropwise at a certain speed, mechanically stirred for 2 h, aged for 1 h, filtered, the filter cake was washed with deionized water, and then placed Dry in an oven at 60°C for 12h to obtain MnO 2 / Bi 2 o 3 / Mn x Zn 1-x Fe 2 o 4 Finall...

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Abstract

A kind of MnO 2 / Bi 2 O 3 / Mn x Zn 1‑x Fe 2 O 4 The preparation method of composite magnetic photocatalyst belongs to the field of inorganic catalytic materials. In the present invention, Mn is first prepared x Zn 1‑x Fe 2 O 4 and MnO 2 , and then prepare MnO 2 / Bi 2 O 3 / Mn x Zn 1‑x Fe 2 O 4 The precursor of the composite magnetic photocatalyst is finally filtered, washed, dried and roasted to obtain the product. The method of the invention has simple preparation process, less equipment, short preparation cycle and low production cost. MnO prepared by the present invention 2 / Bi 2 O 3 / Mn x Zn 1‑ x Fe 2 O 4 The composite magnetic photocatalyst has high activity. Under the irradiation of a xenon lamp that simulates sunlight, 0.1g of the composite magnetic photocatalyst prepared can degrade 100mL of rhodamine B solution with a concentration of 10mg / L. The degradation rate reaches 98% within 1.75h. The catalyst The recovery rate is as high as 87%. After five recycling times, the degradation rate of rhodamine B of the composite magnetic photocatalyst under the same conditions still reaches 96% within 1.75 hours. The products prepared by the invention can be widely used in the field of photocatalytic degradation of organic pollutants.

Description

technical field [0001] The present invention relates to a kind of MnO 2 / Bi 2 o 3 / Mn x Zn 1-x Fe 2 o 4 The invention discloses a preparation method of a composite magnetic photocatalyst, which belongs to the technical field of inorganic environment-friendly catalytic materials. Background technique [0002] With the development of science and technology, the application prospect of semiconductor photocatalysis technology is very broad in the degradation of organic pollutants in water, and it has gradually become one of the hot research topics. The development of semiconductor photocatalytic technology mainly focuses on two directions. One is the traditional photocatalytic material titanium dioxide (TiO 2 ) studies, but TiO 2 The bandgap width is relatively large (3.2eV), and there is basically no photoresponse in the visible light part, which has great restrictions on its application and development; the second is to develop other new photocatalysts, in which bismut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889C02F1/30
CPCC02F1/30B01J23/002B01J23/8892C02F2101/308C02F2305/10B01J2523/00B01J35/39B01J2523/27B01J2523/54B01J2523/72B01J2523/842
Inventor 徐龙君王卫芳刘成伦
Owner CHONGQING UNIV