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TiO2 xerogel for reversible adsorption of azo dye under light control and preparation method and application of TiO2 xerogel

A technology of azo dyes and xerogels, applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc., can solve the problems of secondary pollution and high energy consumption, and achieve simple steps, easy-to-obtain raw materials, Overcoming the effect of low capacity

Inactive Publication Date: 2013-03-20
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of high energy consumption and secondary pollution existing in the desorption of existing adsorption materials, the present invention provides a TiO with light-controlled reversible adsorption of azo dyes 2 Xerogel and its preparation method and application, rationally adjusting the ratio of different raw materials and the conditions of gel formation to prepare TiO 2 Xerogel, which can achieve reversible adsorption and desorption of azo dyes with ultraviolet light as the only energy source

Method used

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  • TiO2 xerogel for reversible adsorption of azo dye under light control and preparation method and application of TiO2 xerogel
  • TiO2 xerogel for reversible adsorption of azo dye under light control and preparation method and application of TiO2 xerogel
  • TiO2 xerogel for reversible adsorption of azo dye under light control and preparation method and application of TiO2 xerogel

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Effect test

Embodiment 1

[0026] This embodiment TiO 2 Xerogel preparation proceeds as follows:

[0027] (1) Drop 10 mL of butyl titanate into a mixture of ethanol (10 mL) and acetylacetone (0.75 mL), stir at room temperature for 10 minutes, and obtain liquid A;

[0028] (2) Take 0.6 mL of nitric acid with a mass percentage of 65%-68%, dilute it 3 times with deionized water and mix it thoroughly with 20 mL of ethanol to form B solution;

[0029] (3) Slowly drop liquid B into liquid A, and keep stirring to obtain a stable sol;

[0030] (4) The sol was aged at room temperature for 7 days, and then vacuum-dried at 80°C to constant weight, that is, xerogel.

[0031] Take 0.05 g of xerogel in 100 mL of acid orange 7 (AO7) solution with a concentration of 70 mg / L, under a low-power ultraviolet lamp (power 20 W, light intensity 0.3 mW / cm 2 , wavelength 254 nm) under light for 3 hours, the AO7 solution was completely decolorized; after 12 hours after removing the light, the color of the solution partially r...

Embodiment 2

[0033] This embodiment TiO 2 Xerogel preparation proceeds as follows:

[0034] (1) Drop 0.75 mL of acetylacetone into 10 mL of butyl titanate, stir at room temperature for 10 minutes, and obtain liquid A;

[0035] (2) Add 20 mL of ethanol to liquid A and continue stirring to obtain liquid B;

[0036] (3) Measure 3 mL of deionized water, 0.5 mL of nitric acid with a mass fraction of 35%, and 10 mL of ethanol, mix well, slowly drop into liquid B, and stir at room temperature for 30 minutes to obtain a homogeneous sol;

[0037] (4) The sol was aged under natural conditions, gelled within 4 hours, and dried naturally at room temperature to constant weight.

[0038] Take 0.01 g xerogel in 25 mL of AO7 solution with a concentration of 40 mg / L, and put it in a low-power ultraviolet lamp (power 36 W, light intensity 0.03 mW / cm 2 , wavelength 254 nm) under light for 2 hours, the solution was colorless, and the dye decolorization rate reached 100%. After being placed in a dark envir...

Embodiment 3

[0040] This embodiment TiO 2 Xerogel preparation proceeds as follows:

[0041] (1) Drop 0.75 mL of acetylacetone into 10 mL of butyl titanate, and stir at room temperature for 10 minutes to form A solution;

[0042] (2) Add 10 mL of ethanol to liquid A and continue stirring to obtain liquid B;

[0043] (3) Measure 3 mL of deionized water, 0.75 mL of acetic acid, and 10 mL of ethanol, mix well, slowly drop into liquid B, and stir at room temperature for 30 minutes to obtain a homogeneous sol;

[0044] (4) The sol was aged to gel under natural conditions, and dried naturally at room temperature to constant weight.

[0045] Take 0.01g of xerogel in 25 mL of AO7 solution with a concentration of 40 mg / L, in a low-power ultraviolet lamp (power 36 W, light intensity 0.03 mW / cm 2 , wavelength 254 nm) under light for 2 hours, the solution was colorless, and the desorption amount of the dye reached 37 mg / g after 24 hours.

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Abstract

The invention discloses a TiO2 xerogel for reversible adsorption of azo dye and a preparation method and application of the TiO2 xerogel, belonging to the field of absorption materials. The TiO2 xerogel for reversible adsorption of azo dye is prepared from tetrabutyl titanate, acetylacetone, alcohol, nitric acid and water as raw materials by adopting a sol-gel method through regulating the proportion of different raw materials and the formation condition of the gel. The preparation method has the advantages of simple steps, easy availability of the raw materials, and environmental friendliness of a preparation process. Proved by experiments, the prepared TiO2 xerogel can realize circulation of absorption-desorption, when the TiO2 xeroge is applied to a sensor, signal transformation can be realized by using the light-sensitive characteristic of the TiO2 xeroge, and when the TiO2 xeroge is applied to the field of water treatment, decoloring of printing and dyeing wastewater and recycling of dyes can be realized.

Description

technical field [0001] The present invention relates to a preparation method and application of a light-controlled adsorption material, and more specifically relates to a kind of TiO with light-controlled reversible adsorption and desorption of azo dyes. 2 Xerogel and its preparation method and application. Background technique [0002] Adsorption is an important interfacial process that can be used for gas separation, water purification, and resource recycling. Adsorption is also a necessary and primary step in photocatalytic reactions. TiO 2 Due to the advantages of good stability and high catalytic efficiency, the preparation and application of photocatalysts have become a research hotspot in the field of catalysis. TiO is currently limited 2 The main bottleneck of photocatalytic application is the low utilization rate of solar energy. Dye molecules adsorbed on TiO 2 The surface can enhance energy utilization through photosensitization of dye molecules. In dye-sens...

Claims

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Application Information

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IPC IPC(8): C01G23/053B01J20/06B01J20/28B01J20/30C02F1/28C02F1/32C02F101/38
CPCY02W10/37
Inventor 张淑娟彭岩刘犀通潘丙才
Owner NANJING UNIV
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