Method for preparing porous iron-doped titanic oxide photocatalyst

A technology of titanium dioxide and photocatalyst, which is applied in the preparation field of photocatalyst technology, can solve the problems of expensive surfactants, reduced catalytic activity, low photocatalytic activity, etc., and achieves less harsh reaction conditions, less solvent pollution, and simple and direct method Effect

Inactive Publication Date: 2010-06-02
SHANGHAI NAT ENG RES CENT FORNANOTECH
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Problems solved by technology

[0003] After searching the prior art, it was found that J.A.Byrne et al. proposed a method in Appl.Catal., B Environ. magazine (1998, No. 17, page 25-36) "fixing titanium dioxide powder for sewage treatment" , to immobilize titanium dioxide powder on a specific carrier to solve the problem that nano titanium dioxide is difficult to separate, but compared with powder samples, the catalytic activity of titanium dioxide powder fixed on the carrier is significantly reduced;
[0004] In addition, after searching, it was found that Xie et al. proposed a method to prepare a kind of mesoporous titanium dioxide microspheres in Inorg.Chem. magazine (2006, No. 45, page 3493-3495) "preparation of titanium dioxide hollow spheres in large quantities". The material is composed of rutile phase, so it has low photocatalytic activity
Although the mesoporous titania fiber prepared by Chen et al. has high catalytic activity, its preparation method uses expensive surfactants, and also uses a relatively demanding electrospinning technology

Method used

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  • Method for preparing porous iron-doped titanic oxide photocatalyst
  • Method for preparing porous iron-doped titanic oxide photocatalyst
  • Method for preparing porous iron-doped titanic oxide photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 0.006 g of solid iron trichloride hexahydrate FeCl successively to 50 ml of ethylene glycol solvent 3 ·6H 2 O and 5ml of butyl titanate Ti(OC4 h 9 ) 4 , after stirring for 30 minutes, the solution was transferred to a round-bottomed flask, refluxed at 180 ° C for 3 hours, and then naturally cooled to room temperature;

[0037] Use a centrifuge to separate the above solution, and then repeatedly wash with absolute ethanol 3 times to obtain a metal alkoxide solid, and the molar percentage of iron in the metal alkoxide solid is equal to 0.25%;

[0038] Dry the obtained metal alkoxide solid at 50°C for 6 hours to obtain the heteronuclear metal alkoxide Fe x Ti 1-x (OCH 2 CH 2 O) 2 Precursor solid powder, wherein x=0.25%;

[0039] In a muffle furnace, the synthesized heteronuclear metal alkoxide is heated at 400° C. for 2 hours to obtain a solid powder of porous iron-doped titanium dioxide photocatalyst with an iron doping amount equal to 0.25%.

[0040] Some st...

Embodiment 2

[0042] Add 0.012g of solid iron trichloride hexahydrate FeCl successively to 50ml of ethylene glycol solvent 3 ·6H 2 O and 5ml of butyl titanate Ti(OC 4 h 9 ) 4 , after stirring for 30 minutes, the solution was transferred to a round-bottomed flask, refluxed at 180°C for 5 hours, and then naturally cooled to room temperature;

[0043] Use a centrifuge to separate the above solution, and then repeatedly wash with absolute ethanol 3 times to obtain a metal alkoxide solid, and the molar percentage of iron in the metal alkoxide solid is 0.5%;

[0044] Dry the obtained metal alkoxide solid at 50°C for 6 hours to obtain the heteronuclear metal alkoxide Fe x Ti 1-x (OCH 2 CH 2 O) 2 Precursor solid powder, where x=0.5%;

[0045] In a muffle furnace, the synthesized heteronuclear metal alkoxide is heated at 400° C. for 2 hours to obtain a solid powder of a porous iron-doped titanium dioxide photocatalyst with an iron doping amount equal to 0.50%.

[0046] Such as Figure 6 T...

Embodiment 3

[0051] Add 0.006 g of solid iron trichloride hexahydrate FeCl successively to 50 ml of ethylene glycol solvent 3 ·6H 2 O and 5ml of butyl titanate Ti(OC 4 h 9 ) 4 , after stirring for 30 minutes, the solution was transferred to a round-bottomed flask, refluxed at 180 ° C for 3 hours, and then naturally cooled to room temperature;

[0052] Use a centrifuge to separate the above solution, and then repeatedly wash with absolute ethanol 3 times to obtain a metal alkoxide solid, and the molar percentage of iron in the metal alkoxide solid is 0.25%;

[0053] Dry the obtained metal alkoxide solid at 50°C for 6 hours to obtain the heteronuclear metal alkoxide Fe x Ti 1-x (OCH 2 CH 2 O) 2 Precursor solid powder, wherein x=0.25%;

[0054] Divide the synthesized heteronuclear metal alkoxide into five equal parts, and heat in a muffle furnace at 350°C for two hours, 400°C for two hours, 450°C for two hours, 500°C for two hours, and 550°C for 2 hours to obtain five A solid powder...

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Abstract

The invention relates to a preparation method of a porous iron-doped titanium dioxide photocatalyst, the preparation method belongs to the technical field of photocatalyst and comprises the followingsteps: solid hexahydrated ferric chloride FeCl3. 6H2O and tetrabutyl titanate Ti(OC4H9)4 are sequentially added in an ethylene glycol solvent for carrying out the stirring and the reflux, and solutionis further cooled to the room temperature; the solution after the cooling is arranged in a centrifuge for carrying out the separation, then the solution is arranged in anhydrous ethanol for carryingout a plurality of times of dispersion and washing, thereby obtaining metal alkoxide solids; the drying treatment and the heating treatment are further carried out to obtain solid powder of the porousiron-doped titanium dioxide photocatalyst. The porous iron-doped titanium dioxide photocatalyst which is prepared and obtained by the preparation method of the invention has high photocatalytic activity in the reaction of the degradation of molecules of organic pollutants, the activity thereof is higher than an industrial product of nano-titanium dioxide photocatalyst P25, the porous iron-doped titanium dioxide photocatalyst also has high stability and can be recycled; compared with the catalysts in the prior art, the activity is more durable.

Description

technical field [0001] The invention relates to a preparation method in the technical field of photocatalysts, in particular to a preparation method of a porous iron-doped titanium dioxide photocatalyst. Background technique [0002] Today, with the increasing prosperity of the global economy and the rapid development of industrialization, the problem of environmental pollution has become a focus that directly threatens the survival of human beings and needs to be solved urgently. Harmful chemicals in soil and water, but these methods require large investment and short timeliness, while semiconductor photocatalysts are used in environmental pollution control with high photochemical conversion efficiency, high stability and high tolerance for deep oxidation of various organic pollutants Sex has been widely concerned by scientists since the beginning. In the current research on environmental photocatalysis, titanium dioxide (TiO 2 ) is the most researched and considered as t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/745B01J21/06
Inventor 何丹农邹晓新李国栋
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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