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Process for preparing iron blended TiO2/active carbon composite visible light catalyst

A technology of composite catalyst and activated carbon, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low solar energy utilization rate, limited light energy utilization rate, secondary pollution, etc., and achieve good Commercial application prospects, excellent photocatalytic performance, and the effect of improving use efficiency

Inactive Publication Date: 2007-01-24
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods are costly and contain a large amount of organic matter, which is likely to cause secondary pollution
And the above-mentioned TiO loaded activated carbon 2 In application, photocatalysis under ultraviolet light is required, and the proportion of ultraviolet light in the sun is less than 5%, which has the disadvantages of low utilization rate of solar energy.
Severely limited TiO 2 Utilization of light energy, especially solar energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 16g of 98% TiOSO 4 and 0.5g ferric chloride (FeCl 3 with TiOSO 4 The molar ratio is 0.03:1) was added into 500mL deionized water, stirred to dissolve completely. 7% aqueous ammonia (mass fraction) was added dropwise with stirring until the pH value of the solution was 7-8. At this time, titanyl sulfate is first hydrolyzed to form metatitanic acid, and then further reacted to form TiO 2 precipitation. Wash the resulting precipitate thoroughly with deionized water until there is no SO in the wash 4 2- until the ion is detected. Add 70mL of deionized water to the washed precipitate to disperse, then add 31mL of 1.6mol L -1 Nitric acid, stirred at 60°C for 15h to obtain iron-doped TiO 2 Sol. The resulting TiO 2 The concentration of the sol is about 1.0mol L -1 .

[0019] TiO 2 TiO by mass ratio with activated carbon 2 : After measuring the ratio of activated carbon=0.05:1, the obtained iron-doped TiO 2 Mix the sol with granular activated carbon evenly, ...

Embodiment 2

[0022] Weigh 16g of 98% TiOSO 4 and 0.8g ferric chloride (FeCl 3 with TiOSO 4 The molar ratio is 0.05:1) was added into 500mL deionized water, stirred to dissolve completely. 7% aqueous ammonia (mass fraction) was added dropwise with stirring until the pH value of the solution was 7-8. At this time, titanyl sulfate is first hydrolyzed to form metatitanic acid, and then further reacted to form TiO 2precipitation. Wash the resulting precipitate thoroughly with deionized water until there is no SO in the wash 4 2- until the ion is detected. Add 70mL of deionized water to the washed precipitate to disperse, and then add 31mL of 1.6mol L -1 Nitric acid, stirred at 70°C for 12h to obtain iron-doped TiO 2 Sol. The resulting TiO 2 The concentration of the sol is about 1.0mol L -1 .

[0023] TiO 2 TiO by mass ratio with activated carbon 2 : The ratio of activated carbon=0.10:1 will make the iron-doped TiO 2 Mix the sol with granular activated carbon evenly, impregnate fo...

Embodiment 3

[0026] Weigh 12g of 98% TiOSO 4 and 1.2g ferric chloride (FeCl 3 with TiOSO 4 The molar ratio is 0.10:1) dissolved in 375mL distilled water to form 0.2mol L -1 solution, then dropwise add 7% ammonia water (mass fraction) to the pH value of the solution to be 6~7, obtain TiO 2 Precipitation, after suction filtration and washing different times, the obtained pure TiO 2 Dissolve the precipitate in 250mL deionized water, then add 1.6mol·L -1 24mL of nitric acid solution, under constant temperature conditions of 70°C, stirred at the same rate for peptization, and stirred at 70°C for 12h to obtain iron-doped TiO 2 Sol. The resulting TiO 2 The concentration of the sol is about 0.3mol L -1 .

[0027] TiO 2 TiO by mass ratio with activated carbon 2 : The ratio of activated carbon=0.15:1 will make the iron-doped TiO 2 Mix the sol and granular activated carbon evenly, impregnate for 5 hours, and dry in an oven at 80 °C for 10 hours to obtain iron-doped TiO 2 / activated carbon...

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Abstract

The process of preparing Fe blended TiO2 / active carbon composite visible light catalyst includes the following steps: dissolving FeCl3 and TiOSO4 in the molar ratio of 0.03-0.20 to 1 in water to prepare titanyl sulfate solution of 0.1-0.3 mol / L Fe3+ concentration; dropping 7 % concentration ammonia water under stirring until reaching pH 6-8 and to obtain precipitate; washing the precipitate and adding nitric acid through stirring at 60-80 deg.c for 8-15 hr to obtain Fe blended TiO2 sol; mixing with active carbon in the TiO2 / active carbon weight ratio of 0.05-0.20 to 1, and soaking for 3-12 hr, drying at 50-90 deg.c in a stove for 8-15 hr to obtain the Fe blended TiO2 / active carbon composite visible light catalyst. The Fe blended TiO2 / active carbon composite visible light catalyst can raise the utilization rate of light energy, especially solar energy, greatly.

Description

technical field [0001] The invention relates to an iron-doped TiO with visible light photocatalytic properties 2 The preparation method of activated carbon composite catalyst. The invention belongs to the technical field of catalyst preparation technology utilizing solar energy. Background technique [0002] TiO 2 Due to its excellent chemical stability, wear resistance, and non-toxicity, it has become the most potential photocatalyst. Its application in the degradation of toxic and harmful organic pollutants has attracted widespread attention in the industry. There are many TiO 2 Thin films and TiO 2 Powders are reported as photocatalysts. However, the prepared TiO 2 The film has disadvantages such as low loading during use, while TiO 2 When the powder is used in photocatalysis, there are problems such as agglomeration and deactivation, and difficulties in separation and recovery, resulting in the use of TiO 2 It is difficult to commerciali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J23/745
Inventor 甘礼华刘明贤张霄英陈龙武
Owner TONGJI UNIV
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