Method of preparing C-doped porous nanometer TiO2 photocatalyst with egg shell membrane as template

A nano-photocatalyst and eggshell membrane technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems that hinder the application of TiO2, and have not yet discovered the public report of research results, so as to facilitate separation , abundant sources and cheap raw materials

Inactive Publication Date: 2007-06-06
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] So far, the research results reported in the literature have focused on solving the above-mentioned hindered TiO 2 One of the two problems applied, no research results that solve both problems have been found to be publicly reported

Method used

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  • Method of preparing C-doped porous nanometer TiO2 photocatalyst with egg shell membrane as template
  • Method of preparing C-doped porous nanometer TiO2 photocatalyst with egg shell membrane as template
  • Method of preparing C-doped porous nanometer TiO2 photocatalyst with egg shell membrane as template

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Experimental program
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Embodiment 1

[0024] After washing 50 g of fresh egg shells with tap water, soak them in 100 mL 2M HCl. After the calcium carbonate in the egg shells is decomposed, the egg shell membrane (EM) can be obtained after separation. Then, first clean the EM with deionized water, and then soak and dehydrate it with isopropanol, change the solvent at regular intervals to remove the water, and finally soak the obtained EM in isopropanol for later use. The dehydrated EM was soaked in a prepared 50 mL 10 wt% isopropyl alcohol solution of tetrabutyl titanate, taken out after 3 hours, and placed in the air to dry for 48 hours. Then, it was placed in a temperature-controlled muffle furnace, heated to 500°C at a rate of 5°C / min, and calcined for 3 hours to obtain carbon-doped TiO 2 Porous Nano Photocatalyst (C-TiO 2 ).

[0025] SEM analysis showed that the carbon-doped TiO prepared by the present invention 2 The porous nano photocatalyst is made of cross-linked TiO 2 Compared with the eggshell membrane templa...

Embodiment 2

[0027] Doping the carbon obtained in Example 1 with TiO 2 Porous nano photocatalyst put 0.02M AgNO 3 Soak in the solution for 24h, immediately after taking it out, soak in 0.02M glucose solution for reduction reaction, take it out after 24h, and dry at room temperature to obtain carbon-doped TiO deposited by silver nanocrystals 2 Porous Nano Photocatalyst (Ag / C-TiO 2 -1).

[0028] SEM analysis showed that the porous TiO deposited with silver nanocrystals prepared by the present invention 2 Nano photocatalyst, keeping TiO 2 A network structure of empty pipes. XRD analysis showed that the TiO 2 It is anatase crystal type with a particle size of 30-40nm, and silver exists as a simple substance. The DRS spectrum shows that the catalyst can absorb 55-65% of visible light in the 400-700nm range.

Embodiment 3

[0030] The preparation process is the same as in Example 1, except that the egg shell membrane is first in 0.02M AgNO 3 Soak in the solution for 24h, and then dehydrated at 20-30℃. Finally, silver nanocrystals and carbon doped TiO are obtained 2 Porous composite photocatalyst (Ag / C-TiO 2 -2)

[0031] SEM analysis showed that the silver nanocrystals prepared by the present invention and carbon doped TiO 2The porous composite photocatalyst is made of TiO 2 Compared with the original EM template, the diameter of the fibers and the diameter of the macropores are slightly shrunk. TEM analysis shows that TiO 2 The fiber is a hollow tube structure, and the tube wall is composed of nanoparticles with a diameter of about 10-40 nm. XRD analysis further showed that the TiO 2 Nanoparticles are in the anatase crystal form, while silver exists as a simple substance, with a particle size of 70-80nm. The DRS spectrum shows that the photocatalyst can absorb 60-65% of visible light with a wavelengt...

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Abstract

The present invention discloses process of preparing C-doped porous nanometer TiO2 photocatalyst with egg shell membrane as the template. One process includes the steps of soaking egg shell in hydrochloric acid, separating egg shell membrane, washing, dewatering, soaking in isopropanol solution of tetrabutyl titanate, taking out, drying at room temperature and final high temperature calcining to obtain C-doped porous nanometer TiO2 photocatalyst. One other process includes the steps of soaking clean egg shell membrane first in AgNO3 solution and then in clucose solution for 24 hr each, taking out, dewatering, soaking in isopropanol solution of tetrabutyl titanate, taking out, drying at room temperature and final high temperature calcining to obtain nanometer Ag crystal and C-doped porous nanometer TiO2 photocatalyst. The said process has rich material source and mild condition, and the prepared photocatalyst has high organic pollutant decomposition catalyzing capacity.

Description

Technical field [0001] The invention relates to a preparation of carbon-doped TiO with eggshell membrane as a template 2 The method of porous nano photocatalyst belongs to the preparation technology of nano photocatalyst. Background technique [0002] In recent years, as environmental pollution has become more and more serious, the use of semiconductor materials as photocatalysts to catalytically degrade organic pollutants in industrial wastewater has become a research and development hotspot. TiO 2 It has the advantages of high photocatalytic activity, good stability, harmless to human body and high light quantum efficiency. It is an environmentally friendly photocatalyst with the most promising application prospects. However, there are currently two more serious problems that hinder TiO 2 Large-scale commercial applications: (1) TiO 2 Band gap is larger (E g =3.0-3.2eV), it can only be excited by ultraviolet light with a wavelength of less than 387nm in sunlight, and the light ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J21/18
Inventor 姜忠义杨冬汪群陈代梅
Owner TIANJIN UNIV
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