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Graphene composite magnetic photocatalyst Mn1-xZnxFe2O4/BiVO4/RGO preparation method

A graphene composite and photocatalyst technology, which is applied in the direction of chemical instruments and methods, physical/chemical process catalysts, heterogeneous catalyst chemical elements, etc., can solve the problems of low photocatalyst efficiency and low recovery rate, and achieve production costs Low, less equipment, inhibit the effect of compounding

Inactive Publication Date: 2016-05-04
CHONGQING UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to target the existing BiVO 4 The efficiency of the photocatalyst is not high and the recovery rate is low, and a graphene composite magnetic photocatalyst Mn 1-x Zn x Fe 2 o 4 / BiVO 4 / RGO, the method is simple, the cost is low, the prepared composite magnetic photocatalyst has strong visible light response, the recovery rate is large, and the recovered catalyst still has high photocatalytic performance, indicating that it has good stability

Method used

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  • Graphene composite magnetic photocatalyst Mn1-xZnxFe2O4/BiVO4/RGO preparation method
  • Graphene composite magnetic photocatalyst Mn1-xZnxFe2O4/BiVO4/RGO preparation method
  • Graphene composite magnetic photocatalyst Mn1-xZnxFe2O4/BiVO4/RGO preparation method

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Effect test

Embodiment 1

[0028] A graphene composite magnetic photocatalyst Mn 1-x Zn x Fe 2 o 4 / BiVO 4 The preparation method of / RGO, concrete steps are as follows:

[0029] (1) BiVO 4 Preparation of precursor solution

[0030] Weigh 10mmol of analytically pure Bi(NO 3 ) 3 ·5H 2 O dissolved in 50 mL of HNO with a concentration of 2 mol / L 3 , ultrasonic oscillation, to obtain solution A; molar ratio Bi(NO 3 ) 3 ·5H 2 O:C 4 h 6 o 6 =10:3, weigh 3mmol of analytically pure C 4 h 6 o 6 (Tartaric acid) was dissolved in 50mL80°C hot water to obtain solution B; by molar ratio Bi(NO 3 ) 3 ·5H 2 O: NH 4 VO 3 =1:1, weigh 10mmol analytically pure NH 4 VO 3 Dissolve in 50mL of hot water at 80°C to obtain solution C; slowly add solution B to solution C, then add solution A to the mixed solution of B and C, cool to room temperature, adjust pH=7.5 with ammonia water, and obtain vanadic acid Bismuth (BiVO 4 ) precursor solution.

[0031] (2) Mn 1-x Zn x Fe 2 o 4 / BiVO 4 Preparation o...

Embodiment 2

[0036] A graphene composite magnetic photocatalyst Mn 1-x Zn x Fe 2 o 4 / BiVO 4 The preparation method of / RGO, concrete steps are as follows:

[0037] (1) with the step (1) of embodiment 1, wherein by molar ratio Bi(NO 3 ) 3 ·5H 2 O:C 4 h 6 o 6 =10:2, weigh 2mmolC 4 h 6 o 6 .

[0038] (2) With the step (2) of embodiment 1.

[0039] (3) with the step (3) of embodiment 1, wherein after making graphene oxide (GO) with potassium permanganate oxide graphite powder, by mass ratio Mn 1-x Zn x Fe 2 o 4 / BiVO 4 : GO=100:1, take the prepared 12mgGO and ultrasonically disperse it in 50ml deionized water to obtain a GO solution, add the above-prepared 1.2gMn 1-x Zn x Fe 2 o 4 / BiVO 4 ;Press NH 3 ·H 2 The volume (ml) of O: the mass (mg) of GO is 1:24, NH 3 ·H 2 O and N 2 h 4 ·H 2 The volume ratio of O is 1:1, add 0.5ml NH 3 ·H 2 O and 0.5mlN 2 h 4 ·H 2 O; react in a water bath at 80°C to reduce GO to graphene (RGO), filter, wash, and dry for 12 hours to ...

Embodiment 3

[0041] A graphene composite magnetic photocatalyst Mn 1-x Zn x Fe 2 o 4 / BiVO 4 The preparation method of / RGO, concrete steps are as follows:

[0042] (1) with the step (1) of embodiment 1, wherein by molar ratio Bi(NO 3 ) 3 ·5H 2 O:C 4 h 6 o 6 =10:4, weigh 4mmolC 4 h 6 o 6 .

[0043] (2) With the step (2) of embodiment 1.

[0044] (3) with the step (3) of embodiment 1, wherein after making graphene oxide (GO) with potassium permanganate oxide graphite powder, by mass ratio Mn 1-x Zn x Fe 2 o 4 / BiVO 4 : GO=100:5, take prepared 60mgGO and ultrasonically disperse in 50ml deionized water to obtain GO solution, add 1.2gMn 1-x Zn x Fe 2 o 4 / BiVO 4 ;Press NH 3 ·H 2 The volume (ml) of O: the mass (mg) of GO is 1:30, NH 3 ·H 2 O and N 2 h 4 ·H 2 The volume ratio of O is 1:3, add 2ml NH 3 ·H 2 O and 6mlN 2 h 4 ·H 2 O; react in a water bath at 80°C to reduce GO to graphene (RGO), filter, wash, and dry for 12 hours to prepare a graphene heterojunctio...

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Abstract

The present invention relates to a graphene composite magnetic photocatalyst Mn1-xZnxFe2O4 / BiVO4 / RGO preparation method belonging to the field of inorganic photocatalytic materials. A heterojunction composite photocatalyst formed by loading sheet layer graphene (RGO) and magnetic Mn1-xZnxFe2O4 particles onto monoclinic BiVO4 has strong conductivity, impedance value (103 Omega.cm<2>) of the heterojunction composite photocatalyst is significantly less than impedance value (351 Omega.cm<2>) of BiVO4 or impedance value (206 Omega.cm<2>) of Mn1-xZnxFe2O4 / BiVO4; the composite catalyst can be used for visible light photocatalytic degradation of rhodamine B, 1.5 hour degradation rate is up to 96%, specific saturation magnetization is 8.21emu . g<-1>, due to strong magnetism, the composite photocatalyst is easy to recover by use of an applied magnetic field, the recovery rate is not less than 89%, degradation rate on RhB of the recovered catalyst is still 85%; the graphene composite magnetic material prepared by the method has high visible light catalytic activity, strong stability and large recovery rate, can significantly improve the removal efficiency and speed when being used in optical degradation of organic pollutants, and has good use prospects.

Description

technical field [0001] The invention relates to a graphene composite magnetic photocatalyst Mn 1-x Zn x Fe 2 o 4 / BiVO 4 The preparation method of / RGO belongs to the technical field of inorganic environment-friendly photocatalytic materials. technical background [0002] Semiconductor photocatalysis technology can directly use visible light to degrade organic pollutants. It has good application prospects in environmental pollution control and new energy development, and has become a hot spot of concern. Monoclinic BiVO 4 It is an n-type semiconductor with a bandgap width of 2.4eV. It can respond to sunlight and has high stability. It has attracted much attention in the field of photocatalytic materials. But BiVO 4 The ability to absorb visible light is weak, and the effective migration speed of photogenerated electrons and holes is small due to the high recombination speed, which severely limits the BiVO 4 Practical applications of photocatalysts. In addition, the ...

Claims

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Application Information

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IPC IPC(8): B01J23/889C02F1/30C02F101/32
CPCC02F1/30B01J23/002B01J23/8892C02F2101/308C02F2101/32C02F2305/10B01J2523/00B01J35/39B01J2523/27B01J2523/54B01J2523/55B01J2523/72B01J2523/842
Inventor 刘成伦李辉徐龙君
Owner CHONGQING UNIV
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