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Magnetic alpha-Fe2O<3-[delta]>C<[delta]>/FeVO<4-x+[delta]>C<x-[delta]> heterojunction photocatalyst, preparation method and applications thereof

A photocatalyst, fevo4-x technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of no patents and literature reports, etc., achieve easy control of doping amount, improve electronic -Effects that are easily achieved by the hole separation rate and experimental conditions

Active Publication Date: 2015-10-14
SHAANXI UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

[0004] So far, the preparation of magnetic α-Fe by hydrothermal method 2 o 3-δ C δ / FeVO 4-x+δ C x-δ The work of heterojunction photocatalysts has not been reported yet, and there are no patents and literature reports on the use of C to simultaneously treat α-Fe 2 o 3 and FeVO 4 Preparation of magnetic α-Fe by lattice substitution 2 o 3-δ C δ / FeVO 4-x+δ C x-δ heterojunction photocatalyst

Method used

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  • Magnetic alpha-Fe2O&lt;3-[delta]&gt;C&lt;[delta]&gt;/FeVO&lt;4-x+[delta]&gt;C&lt;x-[delta]&gt; heterojunction photocatalyst, preparation method and applications thereof
  • Magnetic alpha-Fe2O&lt;3-[delta]&gt;C&lt;[delta]&gt;/FeVO&lt;4-x+[delta]&gt;C&lt;x-[delta]&gt; heterojunction photocatalyst, preparation method and applications thereof
  • Magnetic alpha-Fe2O&lt;3-[delta]&gt;C&lt;[delta]&gt;/FeVO&lt;4-x+[delta]&gt;C&lt;x-[delta]&gt; heterojunction photocatalyst, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1: FeCl 3 ·6H 2 O was dissolved in deionized water and stirred for 30 min to obtain FeCl 3 ·6H 2 O solution, the solution concentration is 0.2mol / L; NH 4 VO 3 Dissolve in deionized water, stir for 30min to obtain NH 4 VO 3 Solution, the solution concentration is 0.2mol / L;

[0035] Step 2, the NH 4 VO 3 The solution is slowly added dropwise to FeCl according to the molar ratio of Fe:V=1:1 3 ·6H 2 In the O solution, stir evenly to obtain a mixed solution; use a NaOH solution with a concentration of 5mol / L to adjust the pH=8 of the above mixed solution;

[0036] Step 3, adding glucose to the above mixed solution, stirring for 30 minutes to obtain a precursor solution, the molar ratio of C:Fe:V in the precursor solution is 0.1:1:1, and the doping amount recorded as C is 10%;

[0037] Step 4, put the precursor liquid into the hydrothermal reaction kettle according to the filling ratio of 52%, and conduct a hydrothermal reaction at 220°C for 16 hours. After th...

Embodiment 2

[0040] Step 1: FeCl 3 ·6H 2 O was dissolved in deionized water and stirred for 30 min to obtain FeCl 3 ·6H 2 O solution, the solution concentration is 0.2mol / L; NH 4 VO 3 Dissolve in deionized water, stir for 30min to obtain NH 4 VO 3 Solution, the solution concentration is 0.2mol / L;

[0041] Step 2, the NH 4 VO 3 The solution is slowly added dropwise to FeCl according to the molar ratio of Fe:V=1:1 3 ·6H 2In the O solution, stir evenly to obtain a mixed solution; use a NaOH solution with a concentration of 5mol / L to adjust the pH=8 of the above mixed solution;

[0042] Step 3, adding glucose to the above mixed solution, stirring for 30 minutes to obtain a precursor solution, the molar ratio of C:Fe:V in the precursor solution is 0.05:1:1, and the doping amount recorded as C is 5%;

[0043] Step 4, put the precursor liquid into the hydrothermal reaction kettle according to the filling ratio of 51%, and conduct a hydrothermal reaction at 220°C for 16 hours. After the...

Embodiment 3

[0046] Step 1: FeCl 3 ·6H 2 O was dissolved in deionized water and stirred for 30 min to obtain FeCl 3 ·6H 2 O solution, the solution concentration is 0.2mol / L; NH 4 VO 3 Dissolve in deionized water, stir for 30min to obtain NH 4 VO 3 Solution, the solution concentration is 0.2mol / L;

[0047] Step 2, the NH 4 VO 3 The solution is slowly added dropwise to FeCl according to the molar ratio of Fe:V=1:1 3 ·6H 2 In the O solution, stir evenly to obtain a mixed solution; use a NaOH solution with a concentration of 5mol / L to adjust the pH=8 of the above mixed solution;

[0048] Step 3, adding glucose to the above mixed solution, stirring for 30 minutes to obtain a precursor solution, the molar ratio of C:Fe:V in the precursor solution is 0.15:1:1, and the doping amount recorded as C is 15%;

[0049] Step 4, put the precursor liquid into the hydrothermal reaction kettle according to the filling ratio of 53%, and conduct a hydrothermal reaction at 220°C for 16 hours. After t...

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Abstract

The invention discloses a magnetic alpha-Fe2O<3-[delta]>C<[delta]> / FeVO<4-x+[delta]>C<x-[delta]> heterojunction photocatalyst, a preparation method and applications thereof. The preparation method comprises the following steps: taking FeCl3.6H2O as the iron source and NH4VO3 as the vanadium source, evenly stirring, adjusting the pH to 7.5-8.5, adding glucose to obtain a precursor solution; subjecting the precursor solution to a hydrothermal reaction, and burning the reaction product so as to obtain the magnetic alpha-Fe2O<3-[delta]>C<[delta]> / FeVO<4-x+[delta]>C<x-[delta]> heterojunction photocatalyst. In the provided preparation method, the C element in glucose is doped into the crystal lattices of FeVO4 and Fe2O3, thus the controllable change of relative contents of C element in the two phases can be achieved; the electron-cavity separation rate, photocatalytic efficiency, and application stability of the photocatalyst are effectively improved; at the same time, the magnetic performance of the heterojunction photocatalyst is improved in a certain degree, and thus the magnetic recovery of the photocatalyst becomes more easier.

Description

technical field [0001] The invention belongs to the field of functional materials and relates to a magnetic α-Fe 2 o 3-δ C δ / FeVO 4-x+δ C x-δ Heterojunction photocatalyst and its preparation method and application. Background technique [0002] FeVO 4 It is a narrow-bandgap semiconductor photocatalyst (Eg=2.06eV) composed of abundant surface elements. There are four crystal structures: monoclinic, orthorhombic I, orthorhombic II and triclinic. Among them, the triclinic FeVO 4 It is a three-dimensional network structure, through Fe-O polyhedron and VO 4 Tetrahedrons are combined to produce. In such a layered structure, there is a gap space, which is the activation area of ​​the photoreaction. At the same time, the interlayer in the structure can also become the acceptor for the combination of photogenerated electrons, so the triclinic FeVO 4 most photocatalytic potential. At present, many researchers have reported the synthesis of iron vanadate nanoparticles and cha...

Claims

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Application Information

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IPC IPC(8): B01J27/20C02F1/32
Inventor 谈国强赵程程杨薇任慧君夏傲王通
Owner SHAANXI UNIV OF SCI & TECH
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