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Catalyst for ultraviolet photocatalytic degradation of organic pollutants and preparation method thereof

A technology for the catalytic degradation of organic pollutants, applied in the field of preparation of catalysts for the degradation of organic pollutants by ultraviolet light, can solve the problems of harsh reaction conditions, low catalytic efficiency, long reaction time, etc. easy effect

Inactive Publication Date: 2015-05-06
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The primary purpose of the present invention is to provide a catalyst for ultraviolet photocatalytic degradation of organic pollutants that overcomes the shortcomings of harsh reaction conditions, long reaction time, high cost, and low catalytic efficiency in the existing preparation methods for organic pollutant degradation catalysts. ; The preparation method

Method used

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  • Catalyst for ultraviolet photocatalytic degradation of organic pollutants and preparation method thereof
  • Catalyst for ultraviolet photocatalytic degradation of organic pollutants and preparation method thereof
  • Catalyst for ultraviolet photocatalytic degradation of organic pollutants and preparation method thereof

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preparation example Construction

[0035] A preparation method of a catalyst for photodegradation of organic pollutants, comprising the following steps:

[0036] A. Pour 8-15g tetrabutyl titanate (TBT), 5-10ml acetic acid, 100-140ml methanol and 5-7g polyvinylpyrrolidone (PVP) into a 250mL conical flask, stir at room temperature for 4-8h, Obtain PVP / TBT sol;

[0037] B. Electrospin the PVP / TBT sol to obtain a PVP / TBT nanofiber membrane;

[0038] C. The obtained PVP / TBT nanofiber membrane was calcined at 500 °C for 4 h to obtain TiO 2 Nanofibers;

[0039] D. 50mg TiO 2 Disperse evenly into a quartz bottle containing 5-50mL of 0.001mol / L silver nitrate solution, and stir for 2h in the dark to make the silver ions in the solution adsorb to TiO 2 nanofiber surface;

[0040] E. TiO adsorbed with silver ions 2 The nanofibers were irradiated with ultraviolet light for 30min-1h, filtered, washed and dried to obtain Ag / TiO 2 catalyst.

[0041] The silver loading is 1-9%.

[0042] described in TiO 2 Loading the...

Embodiment 1

[0044] A. Pour 10g of tetrabutyl titanate (TBT), 7mL of acetic acid, 120mL of methanol and 5.6g of polyvinylpyrrolidone (PVP) into a 250mL conical flask, and stir at room temperature for 4h to obtain a PVP / TBT sol;

[0045] B, will electrospin the PVP / TBT sol to obtain the PVP / TBT nanofiber membrane;

[0046] C. The obtained PVP / TBT nanofiber membrane was calcined at 500 °C for 4 h to obtain TiO 2 Nanofibers;

[0047] D. 50mg TiO 2 Disperse evenly into a quartz bottle containing 5.25mL of 0.001mol / L silver nitrate solution, and stir in the dark for 2 hours to make the silver ions in the solution adsorb to TiO 2 nanofiber surface;

[0048] E. TiO adsorbed with silver ions 2 The nanofibers were irradiated with ultraviolet light for 45 min, filtered, washed, and dried in vacuum at room temperature to obtain 1% Ag / TiO 2 catalyst.

Embodiment 2

[0050] A. Pour 8g tetrabutyl titanate (TBT), 5ml acetic acid, 100ml methanol and 5g polyvinylpyrrolidone (PVP) into a 250mL conical flask, and stir at room temperature for 7h to obtain PVP / TBT sol;

[0051] B, will electrospin the PVP / TBT sol to obtain the PVP / TBT nanofiber membrane;

[0052]C. The obtained PVP / TBT nanofiber membrane was calcined at 500 °C for 4 h to obtain TiO 2 Nanofibers;

[0053] D. 50mg TiO 2 Disperse evenly into a quartz bottle containing 15.75mL of 0.001mol / L silver nitrate solution, and stir in the dark for 2 hours to make the silver ions in the solution adsorb to TiO 2 nanofiber surface;

[0054] E. TiO adsorbed with silver ions 2 The nanofibers were irradiated with ultraviolet light for 30 min, filtered, washed, and dried to obtain 3% Ag / TiO 2 catalyst.

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Abstract

The invention relates to a catalyst for ultraviolet photocatalytic degradation of organic pollutants and a preparation method thereof. The preparation method comprises the following steps of pouring tetrabutyl titanate, acetic acid, methanol and polyvinylpyrrolidone into a conical flask, stirring to obtain a sol, carrying out electrospinning on the sol to obtain a nanometer fiber membrane and calcining to obtain TiO2 nanofibers; and placing the TiO2 nanofibers in a silver nitrate liquid, stirring and reducing and carrying out UV irradiation to obtain the Ag / TiO2 catalyst. By the preparation method, the problems that narrow energy gap, slow electron transfer speed and high electron-hole recombination velocity of the single TiO2 as a photocatalyst are overcome and the photocatalytic degradation efficiency of the organic pollutants is improved. By preparing the TiO2 nanofiber catalyst through the electrospinning, the light-generated electron-hole recombination velocity is reduced and the transfer rate and the catalytic degradation efficiency are increased. The synthesis method is simple and the reaction conditions are mild. By the catalyst, the ultraviolet photocatalytic degradation efficiency under the condition that methyl orange is used as an organic pollution substrate is high and the photocatalytic degradation effect on the organic pollutants is remarkable especially in the use of neutral conditions.

Description

technical field [0001] The invention relates to a method for degrading organic pollutants. Specifically, especially the preparation method of the catalyst for the degradation of organic pollutants by ultraviolet light. Background technique [0002] In recent years, the problem of environmental pollution has become increasingly serious, and a large number of color dyes are discharged into the environment, releasing toxic and even carcinogenic substances. People separate these harmful substances through various physical and chemical processes, such as precipitation, adsorption, reverse osmosis, ultrafiltration, etc. However, these technologies only transfer these pollutants from the water body to other locations such as sludge, and do not eradicate these pollutants, thus causing new pollution. Therefore, finding a new treatment method to convert harmful pollutants into non-polluting substances has become a research hotspot in recent years. [0003] It was first reported by ...

Claims

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Application Information

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IPC IPC(8): B01J23/50C02F1/32
Inventor 张力李俊锋冯超程志强张明月李佳宁姜海峰
Owner JILIN UNIV
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