Magnetic visible-light-driven photocatalyst for treating hexavalent chromium wastewater and preparation method of magnetic visible-light-driven photocatalyst

A visible light and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of fast photogenerated charge recombination rate, high temperature, and large particle size problems, achieve high visible light catalytic activity, easy magnetic separation and recovery, and simple and easy methods

Active Publication Date: 2019-06-21
YANGZHOU UNIV
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Problems solved by technology

However, the high-temperature solid-state reaction method not only uses high temperature (>1000°C) and consumes a lot of energy, but also produces products with large particle size, small specific surface area, and low photocatalytic activity.
In addition, MnFe alone 2 o 4 When used as a photocatalyst, there are also problems of fast recombination rate of photogenerated charges and low separation efficiency.

Method used

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  • Magnetic visible-light-driven photocatalyst for treating hexavalent chromium wastewater and preparation method of magnetic visible-light-driven photocatalyst
  • Magnetic visible-light-driven photocatalyst for treating hexavalent chromium wastewater and preparation method of magnetic visible-light-driven photocatalyst
  • Magnetic visible-light-driven photocatalyst for treating hexavalent chromium wastewater and preparation method of magnetic visible-light-driven photocatalyst

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Embodiment 1

[0036] 1. MnFe 2 o 4 / Synthesis of CPVC composites:

[0037] 1) MnFe 2 o 4 Synthesis of nanoparticles: Measure 70ml of benzyl alcohol in a 150ml beaker, weigh 2mmol of manganese acetate and add it, ultrasonically dissolve it completely for 1h, then add 4mmol of iron acetylacetonate, stir magnetically for 1h, and then transfer to a 100ml volume polystyrene In a stainless steel autoclave lined with vinyl fluoride, seal it, heat it at 200°C for 24h, cool it down to room temperature naturally, wash and dry the obtained precipitate.

[0038] 2) MnFe 2 o 4 / Synthesis of CPVC nanocomposite material: Weigh 20mg of PVC powder and dissolve it in 25ml THF, then add 1000mg of the above solvothermally synthesized MnFe 2 o 4 powder, and then ultrasonically for 2 hours to make it evenly dispersed, put it in an oven and heat it at 65°C for 5 hours to evaporate the tetrahydrofuran solvent to dryness, take out the solid and grind it to obtain MnFe 2 o 4 / PVC nanocomposite. The complex...

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Abstract

The invention discloses a magnetic visible-light-driven photocatalyst for treating hexavalent chromium wastewater and a preparation method of the magnetic visible-light-driven photocatalyst. The preparation method comprises the following steps: preparing MnFe2O4 nanoparticles by using a solvothermal method at first; and then uniformly dispersing the MnFe2O4 nanoparticles in a tetrahydrofuran solution containing polyvinyl chloride (PVC) with different masses, and then carrying out processes of evaporating the tetrahydrofuran solvent to dryness, pyrolyzing PVC in the tetrahydrofuran solvent to convert PVC into a conjugated derivative CPVC and the like to obtain a series of MnFe2O4 / CPVC nanocomposites. The method is simple and feasible, raw materials are easy to obtain, the cost is low, the obtained nano composite material not only has high visible light catalytic activity for reducing hexavalent chromium in water, but also has strong magnetism, is easy to magnetically separate and recycle, and can be used as a new magnetic visible-light-driven photocatalyst for treating the hexavalent chromium wastewater.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst materials, in particular to a magnetic visible light catalyst (MnFe 2 o 4 / CPVC nanocomposite material) and its preparation method. Background technique [0002] Chromium salt is an important class of inorganic chemical products and an important raw material for the development of my country's national economy. According to statistics, chromium salt is related to more than 10% of commodity varieties in my country. At present, the production and usage of chromium salts in my country rank first in the world. With the development of my country's economy in the future, the corresponding demand for chromium salts will also grow steadily. However, a large amount of hexavalent chromium (Cr(VI)) wastewater will be produced in the production and use of chromium salts. Cr(VI) has the characteristics of high toxicity, high water solubility and strong mobility, which seriously endangers the environ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889C02F1/30C02F101/22
Inventor 张永才彭天晓张芬
Owner YANGZHOU UNIV
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