Nano TiO2/PMMA composite photocatalyst synthesized by microwave heating method in ion liquid

A technology of ionic liquid and microwave synthesis, which is applied in the direction of organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, nanotechnology, etc. Capacitance and other issues, to achieve the effect of reducing energy consumption, lowering reaction temperature, and improving photocatalytic activity

Inactive Publication Date: 2009-08-19
YUNNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, inorganic modified TiO 2 cannot change its compatibility with organic media, while the polymer/TiO 2

Method used

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  • Nano TiO2/PMMA composite photocatalyst synthesized by microwave heating method in ion liquid
  • Nano TiO2/PMMA composite photocatalyst synthesized by microwave heating method in ion liquid
  • Nano TiO2/PMMA composite photocatalyst synthesized by microwave heating method in ion liquid

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0021] 1 Preparation of ionic liquids

[0022] The intermediate 1-butyl-3-methylimidazole bromide was prepared under microwave heating conditions by using 1-methylimidazole and bromo-n-butane (bromoallyl) in a ratio of 1:1. Salt [Bmim]Br or [Amim]Br (XH-100A microwave catalytic synthesis / extraction instrument); then use sodium tetrafluoroborate or potassium hexafluorophosphate to react with intermediates to prepare [Bmim]BF respectively 4 , [Bmim]PF 6 , [Amim]BF 4 Three ionic liquids.

[0023] 2TiO 2 Preparation of / PMMA composites

[0024] Using butyl titanate as a precursor, the ionic liquid prepared in the above step 1 as a reaction medium, and adding a certain amount of anhydrous ethanol. Measure a certain amount of butyl titanate and slowly drop it into the ionic liquid, stir magnetically evenly, add 0.01 g of sodium dodecyl sulfate, continue stirring for 10 min, add MMA monomer and stir for 3 min, and then put into microwave catalysis / synthesis In the extraction ap...

Example Embodiment

[0025] Example 1:

[0026] 1. Preparation of ionic liquids

[0027] The intermediate 1-butyl-3-methyl bromide was prepared under microwave heating conditions (500W, 80°C, 2h) by using 1-methylimidazole and n-butane bromide in a ratio of 1:1. Imidazolium salt ([Bmim]Br) (XH-100A microwave catalytic synthesis / extraction instrument); then use sodium tetrafluoroborate to react with intermediates to prepare [Bmim]BF 4 ionic liquid. a, b, c and d in Fig. 3 are pure PMMA and supported TiO 2 SEM image of the post-PMMA.

[0028] 2. TiO 2 Preparation of / PMMA composites

[0029] Using butyl titanate as a precursor, using [Bmim]BF 4 The ionic liquid was the reaction medium, and 17.5 ml of absolute ethanol was added. Measure 3.4ml of butyl titanate and slowly drop it into the ionic liquid, stir magnetically evenly, add 0.01g of sodium dodecyl sulfate, continue stirring for 10min, add methyl methacrylate (MMA) monomer and stir for 3min, Then put it into the microwave catalytic / synt...

Example Embodiment

[0031] Example 2:

[0032] 1. Preparation of ionic liquids

[0033]The intermediate 1-butyl-3-methyl bromide was prepared under microwave heating conditions (500W, 80°C, 2h) by using 1-methylimidazole and n-butane bromide in a ratio of 1:1. Imidazolium salt ([Bmim]Br) (XH-100A microwave catalytic synthesis / extraction instrument); then use potassium hexafluorophosphate to react with intermediates to prepare [Bmim]PF 6 ionic liquid.

[0034] 2. TiO 2 Preparation of / PMMA composites

[0035] Using butyl titanate as a precursor, using [Bmim]PF 6 The ionic liquid was the reaction medium, and 17.5 ml of absolute ethanol was added. Measure 3.4ml of butyl titanate and slowly drop it into the three ionic liquids, stir magnetically evenly, add 0.01g of sodium dodecyl sulfate, continue stirring for 10min, then add methyl methacrylate (MMA) monomer and stir again 3min, then put it into the microwave catalytic / synthetic extractor, set the microwave radiation power (700W), time (35min...

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Abstract

The invention discloses nano TiO2/PMMA composite materials prepared by synthesizing three ionic liquids, namely BmimBF4, BmimPF6 and AmimBF4 by a microwave heating method respectively, and taking the ionic liquids as a reaction medium under the condition of microwave radiation respectively. The composite materials are subjected to testing and characterization by XRD, IR, SEM, TG and BET, and subjected to photocatalytic degradation performance test by a methyl orange solution under a high-pressure mercury lamp; the results show that the composite materials have an optimum preparation condition as for different ionic liquids, and the photocatalytic activity of the TiO2/PMMA composite materials can be obviously improved by adoption of the ionic liquids as the reaction medium; the prepared TiO2/PMMA composite materials represent high photocatalytic activity without high-temperature calcination; and the photocatalytic activity of the composite materials is further improved after TiO2 is loaded with PMMA and is obviously superior to that of an unloaded nano TiO2 catalyst under the same condition.

Description

technical field [0001] The invention relates to the synthesis of 1-allyl-3-methylimidazolium tetrafluoroborate (ie [Amim] BF) by microwave heating 4 ), 1-butyl-3-methylimidazolium tetrafluoroborate (namely [Bmim] BF 4 ), 1-butyl-3-methylimidazolium hexafluorophosphate (namely [Bmim]PF 6 ) three kinds of ionic liquids, especially related to nano-titanium dioxide / polymethyl methacrylate (i.e. TiO 2 / PMMA) composites. Background technique [0002] Due to TiO 2 Photocatalyst has the advantages of high stability, corrosion resistance, harmless to human body, etc., so it has attracted more and more attention from academia and industry, and is expected to become a material with a wide range of applications. But TiO 2 The photogenerated electrons-holes are easy to recombine, and the powder is easy to agglomerate, these shortcomings limit the TiO 2 usage of. A large number of studies have shown that through metal doping, semiconductor recombination and noble metal deposition, ...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J31/06B82B3/00B01J19/08
Inventor 毕先钧杨艳琼张桂琴李丽王昭
Owner YUNNAN NORMAL UNIV
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