Preparation method for ferric oxide-modified titanium dioxide high-efficiency visible photocatalyst

A technology for ferric oxide and titanium dioxide, which is applied in the field of environmental sewage treatment, can solve problems such as restricting large-scale industrialized production, and achieve the effects of simple method, low visible light catalysis efficiency and low cost.

Active Publication Date: 2016-04-13
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing preparations of Fe 2 o 3 / TiO 2 The method needs to go through multiple steps to complete, which seriously limits its large-scale industrial production

Method used

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  • Preparation method for ferric oxide-modified titanium dioxide high-efficiency visible photocatalyst
  • Preparation method for ferric oxide-modified titanium dioxide high-efficiency visible photocatalyst
  • Preparation method for ferric oxide-modified titanium dioxide high-efficiency visible photocatalyst

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Experimental program
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Effect test

Embodiment 1

[0038] Ferric iron tetroxide (Fe 3 o 4 ) powder evenly spread in the dry pot, placed in the muffle furnace through a step-by-step heating program (heating from 25°C to 250°C takes 250 minutes and keeps for 60 minutes; heats up from 250°C to 300°C takes 100 minutes and keeps for 30 minutes; heats up at 300°C To 350°C, take 200min, keep 120min; 350°C to 400°C, take 200min, keep 60min; 400°C to 450°C, take 200min, keep 120min) calcining, so that Fe 3 o 4The powder is directly transformed into ferric oxide (Fe 2 o 3 ). Subsequently, take ferric oxide (Fe 2 o 3 , solid content, 1.0g / L) powder was added to 50ml of methylene blue solution (MB, concentration: 1.0x10 -5 g / L), after fully stirring in the dark room for 30 minutes, put it into a xenon light catalytic instrument (XD350W-1, filter out ≤450nm) visible light instrument for degradation, take out 5ml from the system at regular intervals, centrifuge and separate , and then measure its residual MB value under ultraviolet ...

Embodiment 2

[0040] From the production of P25 produced by Sigma-aldrich company and Aladdin company, the ferric iron tetroxide (Fe 3 o 4 ) powder by mass ratio is P25: Fe 3 o 4 =1:0.2 Mix well, and then evenly spread in the dry pot, put in the muffle furnace and calcined by staged temperature rise program, so that Fe 3 o 4 The powder is directly transformed into ferric oxide (Fe 2 o 3 ) at the same time, it can fully integrate with P25. Finally, P25-20% Fe was prepared 2 o 3 catalyst of light. Subsequently, take P25-20% Fe 2 o 3 (solid content, 1.0g / L) powder was added to 50ml of methylene blue solution (MB, concentration: 1.0x10 -5 g / L), after fully stirring in the dark room for 30 minutes, put it into a xenon light catalytic instrument (XD350W-1, filter out ≤450nm) visible light instrument for degradation, take out 5ml from the system at regular intervals, centrifuge and separate , and then measure its residual MB value under ultraviolet light (663nm), with real-time concent...

Embodiment 3

[0042] From the production of P25 produced by Sigma-Aldrich Company and Aladdin Company, ferric iron tetroxide (Fe 3 o 4 ) powder by mass ratio is P25: Fe 3 o 4 =1:0.4 Mix well, then evenly spread in the dry pot, put in the muffle furnace and calcined by staged temperature rise program, so that Fe 3 o 4 The powder is directly transformed into ferric oxide (Fe 2 o 3 ) at the same time, it can fully integrate with P25. Finally, the P25-40% Fe 2 o 3 catalyst of light. Subsequently, take P25-40% Fe 2 o 3 (solid content, 1.0g / L) powder was added to 50ml of methylene blue solution (MB, concentration: 1.0x10 -5 g / L), after fully stirring in the dark room for 30 minutes, put it into a xenon light catalytic instrument (XD350W-1, filter out ≤450nm) visible light instrument for degradation, take out 5ml from the system at regular intervals, centrifuge and separate , and then measure its residual MB value under ultraviolet light (663nm), with real-time concentration / original c...

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Abstract

The invention discloses a preparation method for a practical ferric oxide-modified titanium dioxide high-efficiency visible photocatalyst, which belongs to the field of treatment of environmental wastewater. The objective of the invention is mainly to overcome the disadvantages of low visible light absorption properties of titanium dioxide, a great number of steps for preparation of ferric oxide-modified titanium dioxide (Fe2O3 / TiO2) and the like. The preparation method provided by the invention only employs commercial P25 and ferriferrous oxide (Fe3O4) nanoparticles as raw materials and carries out calcination by using a gradient heating program so as to allow Fe3O4 powder to be directly converted into ferric oxide (Fe2O3) and to be fully fused with P25, and thus, the high-efficiency Fe2O3 / TiO2 visible photocatalyst is prepared. The method provided by the invention is extension and further expansion of preparation technology for metal oxide doped titanium dioxide and is provided to overcome the disadvantages of poor solar energy utilization capability, difficulty in mass production and the like of photocatalysts. The prepared Fe2O3 / TiO2 visible photocatalyst can be extensively applied to the fields of purification of atmospheric pollution and waste water, etc.

Description

technical field [0001] The invention belongs to the treatment of environmental sewage, and relates to a simple preparation technology of a high-efficiency titanium dioxide visible light catalyst, in particular to a practical preparation method of ferric oxide-modified titanium dioxide and its application in environmental sewage treatment. Background technique [0002] A large number of industrial, agricultural and domestic pollutants are discharged into the environment, resulting in serious water pollution. The existence of these pollutants seriously threatens the health of animals, plants, microorganisms and human beings (L.Jing, W.Zhou, G.Tian, H. Fu. Surface tuning for oxide-based nanomaterials safe photocatalysts. Chem. Soc. Rev., 2013, 42, 9509-9549). Therefore, how to develop efficient methods to remove these pollutants, especially those organic pollutants that are difficult to degrade automatically, toxic heavy metal ions, and pathogenic microorganisms, has become one...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745C02F1/30C02F101/38
CPCY02W10/37B01J23/745B01J21/063C02F1/30C02F2101/38C02F2305/10
Inventor 陈娟荣程黎曹顺生邱守飞常俊
Owner JIANGSU UNIV
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