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Sulfhydryl-functionalized titanium dioxide molecularly imprinted composite and aqueous-phase preparation method and application thereof

A technology of titanium dioxide and molecular imprinting, applied in chemical instruments and methods, oxidized water/sewage treatment, physical/chemical process catalysts, etc., can solve the problem of inability to effectively ensure the polymerization of imprinted materials, affect the formation of precursors, and the strength of crosslinking agents is not large enough and other issues to achieve the effect of improving affinity and selectivity, improving catalytic performance, and improving recognition ability

Active Publication Date: 2018-02-02
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the following difficulties are faced in the material preparation process: (1) During the formation of molecularly imprinted precursors, the hydrogen bonds between template molecules and functional monomers may be affected by water molecules, affecting the formation of precursors; ( 2) The strength of conventional water-soluble cross-linking agents is not strong enough to effectively ensure the polymerization of imprinted materials
In addition, there are few reports on the synthesis methods of titanium dioxide and molecular imprinting technology. Therefore, it is of great significance to develop and deepen research on semiconductor photocatalysis and molecular imprinting technology.

Method used

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  • Sulfhydryl-functionalized titanium dioxide molecularly imprinted composite and aqueous-phase preparation method and application thereof
  • Sulfhydryl-functionalized titanium dioxide molecularly imprinted composite and aqueous-phase preparation method and application thereof
  • Sulfhydryl-functionalized titanium dioxide molecularly imprinted composite and aqueous-phase preparation method and application thereof

Examples

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preparation example Construction

[0043] A method for preparing an aqueous phase of a thiol-functionalized titanium dioxide molecularly imprinted composite material, comprising the following steps:

[0044] (1) Preparation of titanium dioxide-mercaptan: Add 200-220 mL of toluene to a beaker, then add 10 mL-13.20 mL of 3-mercaptopropyl-trimethoxysilane MPTMS to toluene to obtain a mixed solution, MPTMS: toluene = 4% to 7% (v / v). Immediately thereafter, 10-15 g of dried titanium dioxide nanoparticles were added to the above mixed solution, and then subjected to ultrasonic treatment for 30-50 min (ie, one ultrasonic treatment), and then the resulting mixture was stirred for 12-24 h under an argon atmosphere. After the reaction, elute with toluene, sonicate (that is, twice sonicate), remove unreacted 3-mercaptopropyl-trimethoxysilane, then stir and precipitate with toluene, repeat toluene stirring-precipitation 3~ 5 times, centrifuge, and dry the sample in a vacuum drying oven at a drying temperature of 40-60° C....

Embodiment 1

[0047] A thiol-functionalized titanium dioxide molecularly imprinted composite material of the present invention, the composite material uses activated titanium dioxide-thiol as an imprinted carrier, 2,4-dinitrophenol as a template molecule, o-phenylenediamine as a functional monomer and The cross-linking monomer is polymerized under the initiation of ammonium persulfate to form a molecularly imprinted polymer, and then sodium carbonate solution is used to elute the template molecules in the molecularly imprinted polymer to obtain a thiol-functionalized titanium dioxide molecularly imprinted composite material.

[0048] An aqueous phase preparation method of the mercapto-functionalized titanium dioxide molecularly imprinted composite material of the above-mentioned embodiment, comprising the following steps:

[0049] (1) Preparation of titanium dioxide-thiol: add 200mL of toluene to a beaker, then add 10mL of 3-mercaptopropyl-trimethoxysilane (MPTMS) to toluene to obtain a mixe...

Embodiment 2

[0075] An application of the mercapto-functionalized titanium dioxide molecularly imprinted composite material of the present invention in the removal of 2,4-dinitrophenol in water comprises the following steps:

[0076] Under dark conditions, the CMIP-coated TiO prepared in Example 1 of an equal amount of 100mg 2 and CNIP-coated TiO in comparative examples 2 Add to 100mL of 15mg / L 2,4-DNP solution respectively, stir for 4h, after reaching adsorption equilibrium, take some samples, detect the concentration of 2,4-DNP as the initial concentration C o . Under the irradiation of ultraviolet light (2h), while stirring, take some samples at the same time interval (20min), centrifuge and then filter with a 0.22μm filter head, and finally measure the characteristic peaks of the filtered solution under high performance liquid chromatography The peak area, calculated the corresponding concentration of 2,4-DNP (C t ), plotting the catalytic time (t) versus the 2,4-DNP concentration f...

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Abstract

The invention discloses a sulfhydryl-functionalized titanium dioxide molecularly imprinted composite and an aqueous-phase preparation method and application thereof. The molecularly imprinted composite is prepared by mainly using activated titanium dioxide-mercaptan as an imprinting carrier, 2,4-dinitrophenol as a template molecule, and o-phenylenediamine as a functional monomer and a cross-linking monomer for polymerization in an aqueous phase under the initiating effect of ammonium persulfate to form a molecularly imprinted polymer, and eluting the template molecule in the molecularly imprinted polymer. The molecularly imprinted composite can be used to remove the 2,4 dinitrophenol in water. The molecularly imprinted composite has strong affinity to pollutants, good selectivity, high processing efficiency, wide application range and no toxic effect on the environment.

Description

technical field [0001] The invention belongs to the technical field of physical and chemical treatment of 2,4-dinitrophenol in polluted environments, and relates to a mercapto-functionalized titanium dioxide molecularly imprinted composite material and its preparation method and application, in particular to a mercapto-functionalized titanium dioxide molecule The imprinted composite material and its aqueous phase preparation method and the application of the material to remove 2,4-dinitrophenol in the water body environment. Background technique [0002] 2,4-Dinitrophenol is a typical organic pollutant. It is highly toxic and carcinogenic. It is widely used in organic synthesis, dyes, explosives, etc. It can be enriched in the environment, and then enters the human body through the skin, respiratory tract and digestive tract, directly acts on the metabolic process of the human body, strengthens the cell oxidation process, and inhibits the phosphorylation process. In acute po...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30B01J21/06C02F1/28C02F1/30C02F1/32C02F1/72C02F101/38
Inventor 赖萃周响响黄丹莲曾光明秦蕾张辰程敏刘希贵易欢许飘周成赟
Owner HUNAN UNIV
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