A kind of composite nanometer magnetic photocatalyst and preparation method and application thereof

A photocatalyst and nano-magnetic technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of catalyst pollution, easy agglomeration, and non-recyclability , to achieve the effect of no secondary pollution

Inactive Publication Date: 2016-05-25
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, a visible light catalyst and its preparation method (CN102327770A) The visible light catalyst prepared is chromium-doped zinc oxide, which can broaden the photocatalytic response wavelength range of zinc oxide, but the catalyst contains the polluting element chromium, which cannot be recycled, and is easy to cause pollution to the environment
The magnetic photocatalyst prepared in the preparation method of magnetic doped nano titanium dioxide (CN102794164A) is a composite of Fe doped titanium dioxide. The photocatalyst can only use ultraviolet light, and the utilization rate of visible light is low, and it is easy to agglomerate in the magnetic field
However, in a preparation method of magnetically controlled separation of zinc oxide-based photocatalysts (CN102728369A), zinc oxide and magnetic materials are simply combined together, rather than zinc oxide coating magnetic materials, so it has a certain impact on the specific surface area of ​​zinc oxide , thereby reducing its photocatalytic activity
In addition, in a magnetically controllable zinc oxide composite nanocrystalline photocatalyst and its preparation method (CN103285881A), the magnetic base is a compound of gold and nickel, which has ferromagnetism, which is not conducive to uniform dispersion in sewage and reduces the sewage treatment effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Preparation of Composite Nanomagnetic Photocatalyst:

[0017] (1) Preparation of nickel-zinc ferrite: by Ni 0.5 Zn 0.5 Fe 2 o 4 Component ratio Dissolve zinc nitrate, nickel sulfate, and iron nitrate in deionized water in turn, mix well, then slowly add NaOH solution dropwise to form a reddish-brown precipitate and keep stirring until pH=10. Filter and wash with deionized water several times. Add 6 g of polyethylene glycol 6000 to 300 mL of deionized water to form a polyethylene glycol 6000 aqueous solution, add the precipitate to the polyethylene glycol 6000 aqueous solution and stir until a gel is formed, and dry at 120°C for 3 hours to form a xerogel. The gel was calcined in a muffle furnace at 700°C for 4 hours to obtain a brownish-red powder.

[0018] (2) Ni 0.5 Zn 0.5 Fe 2 o 4 Preparation of ZnO: Take 1g of the above composite particles, 14.378g of zinc sulfate and 6.006g of urea and mix them in 380mL of deionized water, radiate in ultrasonic wave for 1h,...

Embodiment 2

[0022] Preparation of Composite Nanomagnetic Photocatalyst:

[0023] (1) Preparation of nickel-zinc ferrite: by Ni 0.5 Zn 0.5 Fe 2 o 4 Component ratio Dissolve zinc nitrate, nickel sulfate, and iron nitrate in deionized water in turn, mix well, then slowly add NaOH solution dropwise to form a reddish-brown precipitate and keep stirring until pH=10. Filter and wash with deionized water several times. Add 6 g of polyethylene glycol 6000 to 300 mL of deionized water to form a polyethylene glycol 6000 aqueous solution, add the precipitate to the polyethylene glycol 6000 aqueous solution and stir until a gel is formed, and dry at 120°C for 3 hours to form a xerogel. The gel was calcined in a muffle furnace at 700°C for 4 hours to obtain a brownish-red powder.

[0024] (2) Ni 0.5 Zn 0.5 Fe 2 o 4 Preparation of ZnO: Take 1g of the above composite particles, 14.378g of zinc sulfate and 6.006g of urea and mix them in 380mL of deionized water, radiate in ultrasonic waves for 1h...

Embodiment 3

[0028] Preparation of Composite Nanomagnetic Photocatalyst:

[0029] (1) Preparation of nickel-zinc ferrite: by Ni 0.5 Zn 0.5 Fe 2 o 4 Component ratio Dissolve zinc nitrate, nickel sulfate, and iron nitrate in deionized water in turn, mix well, then slowly add NaOH solution dropwise to form a reddish-brown precipitate and keep stirring until pH=10. Filter and wash with deionized water several times. Add 6 g of polyethylene glycol 6000 to 300 mL of deionized water to form a polyethylene glycol 6000 aqueous solution, add the precipitate to the polyethylene glycol 6000 aqueous solution and stir until a gel is formed, and dry at 120°C for 3 hours to form a xerogel. The gel was calcined in a muffle furnace at 700°C for 4 hours to obtain a brownish-red powder.

[0030] (2) Ni 0.5 Zn 0.5 Fe 2 o 4 Preparation of ZnO: Take 1g of the above composite particles, 14.378g of zinc sulfate and 6.006g of urea and mix them in 380mL of deionized water, radiate in ultrasonic waves for 1h...

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Abstract

The invention discloses a composite nano-magnetic photocatalyst and a preparation method. The magnetic photocatalyst of the invention adopts a co-precipitation method to prepare nickel-zinc ferrite as a magnetic core, and prepares ZnO as an outer cladding layer through a homogeneous precipitation method. The magnetic nano-photocatalyst has ferromagnetism and partial superparamagnetism, can be evenly distributed along the magnetic field under a magnetic field and is not easy to magnetic aggregation, and has high photocatalytic activity, and can be recovered and recycled through magnetic separation. The preparation method of the invention has the advantages of simple production process, low cost and the like. The prepared composite nano-magnetic photocatalyst is suitable for the treatment of metal particles, oily wastewater, printing and dyeing wastewater, and domestic sewage. It has been proved by the catalytic degradation of sewage that compared with the existing technology, it has the advantages of good treatment effect, fast degradation speed, low consumption, easy recovery, recyclable use, and no pollution to the environment.

Description

technical field [0001] The invention belongs to the field of magnetic photocatalysts, in particular to a composite nanometer magnetic photocatalyst, a preparation method and an application in visible light degradation of high-concentration refractory organic matter. Background technique [0002] In recent years, with the development of science and technology, it has become a new water treatment technology to degrade pollutants in water (especially high-concentration pollutants) through photocatalytic oxidation technology. However, what kind of photocatalyst should be used to achieve high efficiency of sewage treatment is an important issue in the current water treatment process. In addition, the recovery of catalysts in sewage is also a major problem, otherwise it will increase the cost of sewage treatment and easily cause secondary pollution. Therefore, for different wastewaters, determining an efficient magnetic photocatalyst that can utilize visible light is a basic way ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/80B01J35/02C02F1/30
Inventor 郑坤吴春笃解清杰
Owner JIANGSU UNIV
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