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Preparation method of composite photocatalyst, composite photocatalyst and degradation method of dye wastewater

A dye wastewater and catalyst technology, applied in the field of water pollution control, can solve the problems of long degradation time, difficulty in solution storage, and low utilization rate, and achieve the effects of avoiding secondary pollution, improving photocatalytic reaction rate, and high utilization rate

Inactive Publication Date: 2021-06-04
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Fe 2+ The preservation of the solution is difficult and it is easily oxidized by dissolved oxygen and becomes invalid, resulting in low utilization rate
In addition, PP@Au-TiO under visible light as reported in 2 Degrade 20mg / L of alizarin red, the degradation efficiency is only 80% after 3h; Ce 3+ / C 4+ / Bi 2 o 3 / Vis degrades 20mg / L alizarin red, and the degradation efficiency is only 78% after 2 hours; the above reports are all at lower alizarin red concentrations, the degradation time is longer and the degradation efficiency is low

Method used

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  • Preparation method of composite photocatalyst, composite photocatalyst and degradation method of dye wastewater
  • Preparation method of composite photocatalyst, composite photocatalyst and degradation method of dye wastewater
  • Preparation method of composite photocatalyst, composite photocatalyst and degradation method of dye wastewater

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Effect test

Embodiment 1

[0036] This embodiment provides a composite photocatalyst graphite-TiO 2 @Fe 3 o 4 , its preparation method is as follows:

[0037] (1) Pipette 6ml of butyl titanate and 0.6ml of 2mol / L hydrochloric acid into 40ml of absolute ethanol, and stir magnetically for 2 minutes. Take 0.012g of graphite, place it in 4ml of ethanol and sonicate for 1 minute, pour it into the above solution, and sonicate for 3-5 minutes. Finally, 3 ml of deionized water was added and stirred at a constant speed on a magnetic stirrer until it turned into a sol, and then turned into a gel by ultrasonication. After drying at room temperature and grinding, the ground powder was finally placed in a muffle furnace and calcined at 450 °C for 3 hours to obtain graphite-TiO 2 Spherical nanoparticles (G-TiO 2 ).

[0038] (2) in N 2 Under the protection of 7.125g FeSO 4 ·7H 2 O and 3.525g Fe 2 (SO 4 ) 3 respectively dissolved in 75ml deionized water, heated in a water bath at 60°C under magnetic stirrin...

Embodiment 2

[0043] This embodiment provides a composite photocatalyst graphite-TiO 2 @Fe 3 o 4 , its preparation method is as follows:

[0044] (1) Pipette 12ml of butyl titanate and 1.2ml of 2mol / L hydrochloric acid into 80ml of absolute ethanol, and stir magnetically for 2 minutes. Take 0.024g of graphite and place it in 4ml of ethanol for 1 minute, pour it into the above solution, and sonicate for 3-5 minutes. Finally, 6 ml of deionized water was added and stirred at a constant speed on a magnetic stirrer until it turned into a sol, and then turned into a gel by ultrasonication. After drying at room temperature and grinding, the ground powder was finally placed in a muffle furnace and calcined at 450 °C for 3 hours to obtain graphite-TiO 2 Spherical nanoparticles (i.e. G-TiO 2 ).

[0045] (2) in N 2 Under the protection of 9.5g FeSO 4 ·7H 2 O and 4.75g Fe 2 (SO 4 ) 3 respectively dissolved in 100ml deionized water, and heated in a water bath at 60°C under magnetic stirring,...

Embodiment 3

[0047] This embodiment provides a composite photocatalyst graphite-TiO 2 @Fe 3 o 4 , its preparation method is as follows:

[0048] (1) Pipette 12ml of butyl titanate and 1.2ml of 2mol / L hydrochloric acid into 80ml of absolute ethanol, and stir magnetically for 2 minutes. Take 0.024g of graphite and place it in 4ml of ethanol for 1 minute, pour it into the above solution, and sonicate for 3 minutes. Finally, 6 ml of deionized water was added and stirred at a constant speed on a magnetic stirrer until it turned into a sol, and then turned into a gel by ultrasonication. After drying at room temperature and grinding, the ground powder was finally placed in a muffle furnace and calcined at 500 °C for 2 hours to obtain graphite-TiO 2 Spherical nanoparticles (i.e. G-TiO 2 ).

[0049] (2) in N 2 Under the protection of 9.5g FeSO 4 ·7H 2 O and 4.75gFe 2 (SO 4 ) 3 respectively dissolved in 100ml deionized water, and heated in a water bath at 65°C under magnetic stirring, th...

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Abstract

The invention provides a preparation method of a composite photocatalyst, the composite photocatalyst and a degradation method of dye wastewater, and belongs to the field of water pollution treatment. The preparation method of the composite photocatalyst comprises the following steps: mixing butyl titanate, hydrochloric acid and graphite in an ethanol solution, carrying out ultrasonic treatment to obtain gel, drying the gel, grinding into powder, and calcining to obtain graphite-TiO2; and then dispersing the graphite-TiO2 nanoparticles in a mixed solution containing Fe3O4, adding NaOH and polyethylene glycol, and carrying out a reaction to obtain the composite photocatalyst graphite-TiO2@Fe3O4. The composite photocatalyst is high in catalytic activity and high in recovery rate. The composite photocatalyst graphite-TiO2@Fe3O4 and persulfate are synergistically applied to degradation of dye wastewater, and by means of the method, the degradation rate of azo dyes such as alizarin red which are difficult to degrade can reach 90% or above.

Description

technical field [0001] The invention relates to the field of water pollution control, in particular to a preparation method of a composite photocatalyst, a composite photocatalyst and a degradation method of dye wastewater. Background technique [0002] Azo dyes are widely used in paper printing, textile and leather manufacturing processes, posing significant risks to the ecological environment due to their high toxicity, carcinogenicity and mutagenicity. Most azo dyes are difficult to degrade due to their complex structures. For example, alizarin red is an anthraquinone dye, which is in powder form in solid form, easily soluble in water, highly toxic, but difficult to degrade. Therefore, photocatalytic oxidation technology has become one of the hot spots in the treatment of azo dye wastewater. [0003] TiO 2 Photocatalysts are widely used in photocatalytic technology due to their advantages of stability, high oxidation capacity and eco-friendliness. Due to TiO 2 TiO wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J35/08C02F1/72C02F1/30C02F101/30C02F101/38
CPCB01J23/745B01J23/002C02F1/725C02F1/722C02F1/30C02F2101/308C02F2305/10C02F2305/023C02F2101/40B01J35/33B01J35/51B01J35/39
Inventor 饶砚迪李傲奇张雨昕张天虎周艳萍黄海明
Owner YANSHAN UNIV
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