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Preparation method for in-situ carbon doped hollow titanium dioxide visible light photocatalyst

A titanium dioxide and catalyst technology, applied in the field of titanium dioxide photocatalyst, can solve the problems of poor ability to utilize solar energy, low utilization rate of visible light part, low quantization yield, etc., and achieves low cost, high-efficiency visible light catalytic activity, and strong photocorrosion resistance. effect of ability

Active Publication Date: 2015-07-08
JIANGSU UNIV
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Problems solved by technology

[0003] Titanium dioxide has the advantages of non-toxicity, low cost, high-efficiency ultraviolet photocatalytic ability and high stability, making it widely used in the fields of treating air pollution and polluted wastewater In 1972, A. Fujishima and K. Honda (A. Fujishima, K. Honda, Electrochmeical photolysis of water at a semiconductor electrode. Nature , 1972, 238, 37) Since the first research on titanium dioxide photo-splitting water, explosive growth has been achieved in the preparation of various high-efficiency titanium dioxide photocatalytic devices, and it has become the fastest-growing research topic in environmental protection fields such as air pollution and wastewater purification. Unfortunately, the use of titanium dioxide as a photocatalyst still has the following shortcomings: slow reaction rate, low quantization yield, poor ability to utilize solar energy, and low utilization rate of visible light in sunlight. For this reason, how to Improving the visible light catalysis of titanium dioxide has become a difficult research point for new environmentally friendly catalytic materials (A. Ayati, A. Ahmadpour, F. Bamoharram, B. Tanhaei, M. Manttari, M. Sillanpaa. A review on catalytic applications of Au / TiO2 nanoparticles in the removal of water pollutant. Chemosphere, 2014, 107, 163)
[0005]Carbon doping has a series of advantages such as metal-like conductivity, large electron storage capacity, improved photoelectron-hole separation, and wide visible light absorption. , which has attracted great attention from scientific and technological workers (S. Lee, Y. Lee, D. H. Kim, J. Moon. Carbon-deposited TiO2 3D inverse opal photocatalysts: visible-light photocatalytic activity and enhanced activity in a viscous solution. ACSAppl. Mater. Interfaces, 2013, 5, 12526), ​​however, the current method of preparing carbon-doped titanium dioxide is still It has great disadvantages, such as the need to add additional carbon precursors and the easy aggregation of doped carbon components (L. Quan, Y. Jang, K. Stoerzinger, K. May, Y. Jang, S. Kochuveedu, Y. S. Horn , D. H. Kim. Soft-template-carbonization route to highly textured mesoporous carbon–TiO2 inverse opals for efficient photocatalytic and photoelectrochemical applications. Phys. Chem. Chem. Phys., 2014,16, 9023), therefore, the development of a simple and low-cost method for preparing carbon-doped titanium dioxide visible light catalyst not only has important conceptual significance, but also has great application value; the starting point of the present invention lies in this

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  • Preparation method for in-situ carbon doped hollow titanium dioxide visible light photocatalyst
  • Preparation method for in-situ carbon doped hollow titanium dioxide visible light photocatalyst
  • Preparation method for in-situ carbon doped hollow titanium dioxide visible light photocatalyst

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Embodiment 1

[0047] Put 72g of deionized water, 8g of styrene and 0.16g of potassium persulfate into a 150ml four-necked bottle, and remove the air with nitrogen at a stirring speed of 350rpm. After about 20 minutes, use the pre-adjusted approx. Warm water at 70°C was quickly poured into a constant temperature water bath, and kept at 70°C; after 1.5 hours of reaction, under the protection of nitrogen, a mixture of 1.2 g of VTC and deionized water (mixed with deionized water Volume ratio 1:1) into the reaction bottle, the first three injections every half an hour (10 μl per injection), and then two injections, one injection every hour, each injection is (50 μl); then the remaining solution was injected every 3 Inject one injection per minute, each injection is (10μl), until all the remaining VTC is injected, and after the injection is completed, extend the polymerization for about 12 hours to make it fully polymerized. After the polymerization is completed, use a water-based microporous m...

Embodiment 2

[0049] Preparation of carbon-doped hollow titanium dioxide microspheres with a shell thickness of about 20 nm: Add 4 g of PS template and 40 mL of ethanol in a 100 mL three-necked flask, stir evenly with magnetic force, and control the temperature of the reaction system at 0 ℃, slowly add 20 mL of prepared 0.1 g / mL n-tetrabutyl titanate ethanol solution to the reaction system dropwise, after settling for 24 hours, slowly add 3 mL of deionized water and 6 mL of ethanol dropwise (the amount of water should not be too much High, otherwise the TBT hydrolysis rate is too fast) After the liquid is combined, the hydrolysis reaction is carried out for 20 hours; after the reaction is completed, the sample is centrifuged, washed with deionized water and ethanol alternately several times, and dried in an oven at 60 °C for 15 hours to obtain polystyrene-titanium dioxide Core-shell structure; carbon-doped hollow titanium dioxide microspheres are prepared by performing a specific segmented t...

Embodiment 3

[0051] Preparation of carbon-doped hollow titanium dioxide microspheres with a shell thickness of about 29 nm: Add 4 g of PS template and 40 mL of ethanol in a 100 mL three-necked flask, stir evenly with magnetic force, and control the temperature of the reaction system at 0 ℃, slowly drop the prepared 20 mL, 0.15 g / mL n-tetrabutyl titanate ethanol solution into the reaction system, after settling for 24 hours, slowly add a mixture of 3 mL deionized water and 6 mL ethanol for hydrolysis reaction After the reaction was completed, the sample was centrifuged, washed several times with deionized water and ethanol alternately, and dried in an oven at 60 °C for 15 h to obtain a polystyrene-titanium dioxide core-shell structure; The carbon-doped hollow titanium dioxide microspheres are prepared by segmental temperature programming and calcination.

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Abstract

The invention relates to titanium dioxide photocatalysts, especially to a preparation method of an in-situ carbon doped hollow titanium dioxide photocatalyst and application of the photocatalyst in sewage treatment. In order to solve the disadvantage of needing to add a carbon precursor in existing preparation methods for carbon doped titanium dioxide, the invention provides a technology for in-situ preparation of the carbon doped hollow titanium dioxide visible light photocatalyst through carbonization of a cation template. The efficient carbon doped visible light photocatalyst is mainly obtained by control of monodispersion of the cation template, self-assembly of tetrabutyl titanate (TBT) on the template surface, catalytic hydrolysis of TBT and segmented programmed calcination to remove the template. Therefore, the method provided by the invention is continuation and further expansion of the titanium dioxide preparation technology, and is also invented directed at the disadvantages of slow reaction rate, low quantization yield, poor solar energy utilization ability and the like. And the research result can be widely applied to atmospheric pollution, wastewater treatment, solar cell development and other fields.

Description

technical field [0001] The invention relates to a titanium dioxide photocatalyst, in particular to a preparation method of an in-situ carbon-doped hollow titanium dioxide photocatalyst and its application in 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 human health (L. Jing, W. Zhou, G. Tian, ​​H. Fu. Surface tuning for oxide-based nanomaterials as efficient photocatalysts. Chems . soc . Rev. ., 2013, 42 , 9509), therefore, how to effectively remove these pollutants has become one of the research hotspots in environmental science today; compared with physical adsorption and bioremediation, photocatalytic degradation, as a green technology, can completely degrade all pollutants, And will not produce any toxic pollutants or intermediates, is considered to be one of the most i...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J35/08C02F1/30
CPCY02A20/212Y02W10/37
Inventor 曹顺生张颖赵志远陈娟荣龚爱华傅行礼常俊程黎
Owner JIANGSU UNIV
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