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Multiple modified composite photocatalyst and preparation method thereof

A catalyst, composite light technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve uneven distribution of groups, damage to carbon nanotube structure and Conductivity and other properties, particles are not easy to adhere to, etc.

Inactive Publication Date: 2013-11-27
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, carbon nanotubes usually need to be treated with strong acid to make the tube wall with grafted groups, which is convenient to combine with TiO 2 However, the strong acid treatment will destroy the structure and electrical conductivity of the carbon nanotubes themselves, and at the same time, the uneven distribution of groups after the surface modification of CNTs will lead to the formation of nano-TiO 2 Particles are not easy to attach to the tube wall of CNTs and agglomerate themselves

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 17.0g SnCl 4 ·5H 2 O and 68.0g tetrabutyl titanate solution, add 377ml dehydrated alcohol and 26.75g nitric acid, stir to obtain solution A, mix 0.25g Co(NO 3 ) 2 ·6H 2 O was dissolved in 215 ml deionized water to obtain solution B. Add solution B dropwise to solution A, stir for 2 hours; let stand for 10-48 hours, dry in an oven at 60-120°C, raise the temperature to 400°C at a heating rate of 3°C / min, and roast for 2-6 hours. Take it out for later use, cool and grind to obtain transition metal element cobalt-doped modified SnO 2 -TiO 2 catalyst.

[0020] SnO modified by doping the above transition metal element cobalt 2 -TiO 2 The catalyst is placed in a fluidized bed reactor, the loading amount of the catalyst is 10 g, and the particle size is 100-200 mesh. In the flow rate of 0.25 ~ 0.4m 3 / h high purity N 2 Under air flow, the temperature of the reactor was programmed. When the temperature inside the reactor is 600°C, the C 2 h 4 , at N 2 and C ...

Embodiment 2

[0022] SnO was first prepared by sol-gel method 2 -TiO 2 Catalyst (Sn:Ti=0.5, molar ratio), then take SnO 2 -TiO 220 grams of catalyst powder are dispersed in 500 milliliters of ammonium molybdate and cupric chloride mixed solution (the molar concentration of ammonium molybdate is 1.0mol / L, and the molar concentration of cupric chloride is 2.2mol / L), stirs 2~4 hours, Immerse for 10-48 hours, and then dry at 40-120°C to obtain transition metal copper and molybdenum co-doped modified SnO 2 -TiO 2 catalyst

[0023] SnO modified by co-doping the above transition metals copper and molybdenum 2 -TiO 2 The catalyst is packed into a fixed bed reactor. In high purity N 2 Under air flow, the temperature of the reactor was programmed. When the temperature in the reactor is 550°C, the C 2 h 4 , at N 2 and C 2 h 4 The flow ratio was 15:1, and CNTs were grown for 15 minutes. After the reaction was completed, it was naturally cooled to room temperature, and the product was take...

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Abstract

The invention discloses a multiple modified composite photocatalyst and a preparation method thereof. A matrix of the composite photocatalyst is a compound semiconductor SnO2-TiO2 of SnO2 and TiO2, wherein the atomic ratio of Sn to Ti is (0.1-10.0):1. The preparation method comprises the following steps of: preparing a SnO2-TiO2 catalyst containing transition metals, namely Co, Mo, Cu, Pt, Au, Pd and Ag, or synthesizing the compound semiconductor matrix SnO2-TiO2 of the photocatalyst and impregnating in a solution containing transition metal elements, drying, grinding, and finally growing carbon nano-tubes (CNTs) on the surface of the transition metal doped and modified SnO2-TiO2 catalyst in situ by a vapor deposition method. The preparation method for the composite photocatalyst is suitable for large-scale production.

Description

【Technical field】 [0001] The invention relates to the technical fields of fine chemical industry and environmental protection technology, in particular to a multi-modified composite photocatalyst and a preparation method thereof. 【Background technique】 [0002] Nano-TiO 2 Photocatalysts have been extensively studied by scientists from various countries. Under the irradiation of ultraviolet light, electrons from TiO 2 The valence band of is excited to the conduction band, generating positively charged holes in the valence band. However, the recombination rate of electrons and holes generated by photoexcitation is very fast, and the recombination time is about 10 -9 sec, while TiO 2 The time required for chemical interaction with organic pollutants adsorbed on its surface is 10 -8 -10 -3 second. The gap between the two leads to TiO 2 low photocatalytic efficiency. On the other hand, titanium dioxide is a semiconductor with a wide bandgap, which only absorbs ultraviole...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/14
Inventor 陆金东张哲马磊何洪波曾炽涛陈爱平
Owner EAST CHINA UNIV OF SCI & TECH