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A kind of preparation method of high-efficiency catalytic p-nitrophenol hydrogenation reduction catalyst

A technology of p-nitrophenol and a catalyst is applied in the field of cobalt selenide nanocomposite materials, which can solve the problems of being unsuitable for industrial production and use, limiting the wide application of composite materials, and being unsuitable for industrial production, etc., and achieves good potential application value and good repeatability. Usable, easy-to-control effects

Inactive Publication Date: 2017-03-15
ANHUI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Such as the above example, many of the reported composite materials that can catalyze the reduction of p-nitrophenol have the participation of noble metals. This is because of the unique chemical properties of noble metals, and the materials obtained by compounding them often have better results, but noble metals The use of its composite materials limits its wide application, so it is not suitable for industrial production
Non-integer ratio cobalt selenide (Co 0.85 Se), as a stable hexagonal material, was first reported by us in the Netherlands "Applied Catalysis, Series B" (Applied Catalysis B: Environmental, 2012, Volume 119-120, Page 139-145), through The one-step hydrothermally synthesized material has a graphene-like structure with a thickness of no more than 10 nanometers; graphene, as a material with excellent physical and chemical properties, is widely used in the preparation of composite materials, but the current method for preparing graphene It is still relatively complicated, still in the stage of laboratory synthesis, and not suitable for industrial production

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  • A kind of preparation method of high-efficiency catalytic p-nitrophenol hydrogenation reduction catalyst
  • A kind of preparation method of high-efficiency catalytic p-nitrophenol hydrogenation reduction catalyst
  • A kind of preparation method of high-efficiency catalytic p-nitrophenol hydrogenation reduction catalyst

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Embodiment 1

[0035] Embodiment 1: the preparation of the cobalt selenide nanocomposite material of loading titania:

[0036] ① Prepare Co 0.85 Se, the specific steps are: weigh 0.5 mmol Co(NO 3 ) 2 ·6H 2 O and 0.5 mmol Na 2 SeO 3 , add 18 milliliters of distilled water, then slowly add 2 milliliters of hydrazine hydrate aqueous solution with a mass percentage of 85% under the condition of magnetic stirring. It was taken out after standing under the ground for 24 hours, and after naturally cooling to room temperature, the resulting product was alternately washed three times with ethanol and distilled water, and dried in an oven at 60 degrees Celsius for 6 hours to obtain cobalt selenide nanosheets.

[0037] ②Use a pipette gun to draw 25 microliters of tetrabutyl titanate (TBOT), inject 20 milliliters of anhydrous ethylene glycol, and stir magnetically for 30 minutes to obtain a uniform solution; then weigh 0.5 mmol of the non-integer ratio obtained in ① Cobalt selenide was dispersed i...

Embodiment 2

[0044] Embodiment 2: catalytic reduction p-nitrophenol:

[0045] Mix 2 ml of distilled water, 0.1 ml of 5.0×10 -3 The p-nitrophenol aqueous solution of M is added in the quartz cuvette successively, and there is an absorption peak at 317 nanometers place to measure with ultraviolet-visible spectrophotometer; Then add the sodium borohydride aqueous solution of 0.03M that the concentration of 1 milliliter is newly prepared, use There is an absorption peak at 400 nanometers when measured by a UV-visible spectrophotometer, and the concentration corresponding to this absorption peak is defined as the initial concentration; finally, 1 mg of cobalt selenide nanocomposite material loaded with titanium dioxide is added, and it is measured by UV-visible light every 1 minute. Measure with a spectrophotometer until the peak around 400 nm no longer changes significantly.

[0046] The properties of catalytic p-nitrophenol of the samples were tested by Shimadzu UV-3600 ultraviolet spectroph...

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Abstract

The invention discloses a preparation method for a catalyst efficiently catalyzing hydrogenation reduction of 4-nitrophenol, and belongs to the technical field of nanometer material preparation and application. Employed graphene-shaped non-integer-ratio cobaltous selenide (Co[0.85]Se) has the thickness not larger than 10 nanometer, and titanium dioxide supported by the cobaltous selenide (Co[0.85]Se) has the particle size of about 10 nanometer. The catalyst is large in specific surface area, has high catalytic efficiency on hydrogenation reduction of 4-nitrophenol, does not employ noble metals and is low in cost. The preparation method is simple, easy to operate, free of organic templates and surfactants, and suitable for industrial production. The prepared titanium dioxide / cobaltous selenide (Co[0.85]Se) is pure in phase, large in specific surface area, good in catalytic reduction effect on 4-nitrophenol and high in repeated utilization value, and has potential utilization value on the aspect of sewage processing.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of preparation and application of nanometer materials, and specifically relates to the preparation of a cobalt selenide nanocomposite material loaded with titanium dioxide by a hydrothermal method, and the material has the property of efficiently catalytically reducing p-nitrophenol. [0003] Background technique: [0004] Titanium dioxide (TiO 2 ) as one of the most common catalysts, has been used in air purification, disinfection and sewage treatment and so on. However, due to the shortcomings of titanium dioxide itself such as wide band gap and easy recombination of electron-hole pairs, the catalytic activity of a single titanium dioxide is often limited, and nanoscale composites formed by loading titanium dioxide on other materials have excellent properties. Due to the existence of different electronic energy levels in the composite material, the driving force for charge separation can be provide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/057B82Y30/00B82Y40/00C07C213/02C07C215/76C02F1/70C02F1/58
CPCY02W10/37
Inventor 宋吉明左永张胜义牛和林毛昌杰沈玉华
Owner ANHUI UNIVERSITY