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A kind of nb(oh)5 nanowire/reduced graphene oxide composite photocatalyst and preparation method and application thereof

A graphene composite, photocatalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve toxicity, skin respiratory and digestive system hazards, human body Nervous system and ecological environment hazards and other problems, to achieve the effect of promoting separation, simple and time-saving preparation process, and improving photocatalytic activity

Active Publication Date: 2018-09-28
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Phenolic compounds in wastewater are a type of protoplasmic poisons, which can coagulate proteins and have great potential harm to the human nervous system and the ecological environment. At the same time, phenolic wastewater is often accompanied by the presence of heavy metal ions such as chromium, mercury, and lead. Among them, water-soluble Cr(VI) has strong toxicity and strong oxidizing property, which will cause serious harm to human skin, respiratory and digestive systems, etc.

Method used

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  • A kind of nb(oh)5 nanowire/reduced graphene oxide composite photocatalyst and preparation method and application thereof
  • A kind of nb(oh)5 nanowire/reduced graphene oxide composite photocatalyst and preparation method and application thereof
  • A kind of nb(oh)5 nanowire/reduced graphene oxide composite photocatalyst and preparation method and application thereof

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Embodiment 1

[0034] A Nb(OH) 5 Preparation method of nanowire / reduced graphene oxide composite photocatalyst:

[0035] In terms of mass fraction, the mass content of reduced graphene oxide is 1.0%, Nb(OH) 5 It is an amorphous nanowire with a length of 3 μm and a diameter of 100 nm. The preparation method of this composite photocatalyst is as follows:

[0036] 1g Nb 2 o 5 The powder was placed in 70 mL of 10 mol / L KOH solution, stirred at room temperature for 1 h, and then 10 mL of 1.0 mg / mL graphene oxide aqueous solution was added thereto, and the mixed suspension was obtained by ultrasonication at room temperature for 0.5 h; the resulting mixed suspension was transferred to a polymer In a tetrafluoroethylene microwave reaction tank, after sealing, place it in a microwave reactor and react for 1.5h at a power of 300W; after cooling, vacuum filter the suspension in the reaction tank, and use 150mL of 0.02mol / L Washed with dilute hydrochloric acid for 3 times, and then washed with deio...

Embodiment 2

[0043] A Nb(OH) 5 Preparation method of nanowire / reduced graphene oxide composite photocatalyst:

[0044] In terms of mass fraction, the mass content of reduced graphene oxide is 2.5%, Nb(OH) 5 It is an amorphous nanowire with a length of 3.5 μm and a diameter of 80 nm. The preparation method of this composite photocatalyst is as follows:

[0045] 2g Nb 2 o 5 The colloid was placed in 70mL of 16mol / L NaOH solution, stirred at room temperature for 0.5h, and then 10mL of 5.0 mg / mL graphene oxide aqueous solution was added thereto, and the mixed suspension was obtained by ultrasonication at room temperature for 2h; the resulting mixed suspension was transferred to polytetrafluoroethylene In an ethylene microwave reaction tank, seal it and place it in a microwave reactor for 1 hour at a power of 500W; after cooling, vacuum filter the suspension in the reaction tank, and wash the solids with 150mL of 1mol / L dilute hydrochloric acid respectively 3 times, and then washed with de...

Embodiment 3

[0049] A Nb(OH) 5 Preparation method of nanowire / reduced graphene oxide composite photocatalyst:

[0050] In terms of mass fraction, the mass content of reduced graphene oxide is 5.0%, Nb(OH) 5 It is an amorphous nanowire with a length of 1.5 μm and a diameter of 120 nm. The preparation method of this composite photocatalyst is as follows:

[0051] 0.5g Nb 2 o 5The powder was placed in 70mL of 8mol / L KOH solution, stirred at room temperature for 1.5h, then 10mL of 2.5 mg / mL GO aqueous solution was added to it, and the mixed suspension was obtained by ultrasonication at room temperature for 1.5h; the resulting mixed suspension was transferred to polytetrafluoroethylene In a microwave reaction tank, after sealing, place it in a microwave reactor and react for 2 hours at a power of 200W; after cooling, vacuum filter the suspension in the reaction tank, and wash the solids with 150mL of 0.1mol / L dilute hydrochloric acid respectively 3 times, and then washed with deionized wat...

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Abstract

The invention relates to a Nb(OH)5 nanowire / reduced graphene oxide composite photocatalyst, and a preparation method and application thereof. The active compositions of the catalyst comprise Nb(OH)5 and reduced graphene oxide, and Nb(OH)5 nanowires are uniformly distributed on laminar reduced graphene oxide. According to the preparation method, Nb2O5 is taken as a niobium source, GO is taken as a carrier and a template agent, and a microwave synthesis process is employed for preparing an in-situ compound of the niobate nanowires and reduced graphene oxide, metal ions in the niobate layers are displaced by hydrogen ion through acid exchange, an obtained niobate nanowire and reduced graphene oxide compound is calcined, so that the Nb(OH)5 nanowire / reduced graphene oxide composite photocatalyst is obtained. The preparation method is simple and time-saving, the material morphology is uniform, the synthesis condition is easy to control, and the preparation method is suitable for industrialized batch production. When applied to remove phenol pollutants in waste water under irradiation of visible light at normal temperature, the Nb(OH)5 nanowire / reduced graphene oxide composite photocatalyst is capable of reducing high-toxicity hexavalent chromium into trivalent chromium and achieves the purpose of highly purifying composite polluted waste water.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, in particular to a Nb(OH) 5 Nanowire / reduced graphene oxide composite photocatalyst and its preparation method and application. Background technique [0002] Composite materials with controllable morphology and composition have great potential application value in the fields of heterogeneous catalysis, solar energy conversion and photoelectrochemistry (H.Liu, et al.3D Bi 2 MoO 6 Nanosheet / TiO 2 Nanobelt Heterostructure: Enhanced Photocatalytic Activities and Photoelectrochemical Performance, ACSCatal. 2015, 5, 4530-4536; X.S. Zhao, et al. Nitrogen-Doped Titanate-Anatase Core-Shell Nanobelts with Exposed{101}Anatase Facets and Enhanced Photo Visible, J .Am.Chem.Soc.2012, 134, 5754-5757; Han Cheng et al., Progress in the Preparation of Solar Fuels by Nano-heterojunction Photocatalytic Materials, Journal of Inorganic Chemistry. 2015, 30, 1121-1130; Li Shichao et al., Three-dimensional cl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/20C02F1/30C02F1/70C02F101/34C02F101/22
CPCY02W10/37
Inventor 杨娟戴俊卞琳艳沈晓晓
Owner HENAN POLYTECHNIC UNIV
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