Preparation method for photocatalyst for treating nitrophenol wastewater and treatment method for nitrophenol wastewater

A technology of nitrophenol and photocatalyst, which is applied in the field of wastewater treatment, can solve the problems of hindering the diffusion of macromolecular products and the difficulty of catalytic degradation of macromolecules, and achieve the effects of improving photocatalytic treatment efficiency, increasing specific surface area, and reducing treatment costs

Inactive Publication Date: 2015-03-11
ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the typical microporous structure (less than 2nm) of ZSM-5 zeolite hinders the diffusion of macrom...

Method used

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  • Preparation method for photocatalyst for treating nitrophenol wastewater and treatment method for nitrophenol wastewater
  • Preparation method for photocatalyst for treating nitrophenol wastewater and treatment method for nitrophenol wastewater
  • Preparation method for photocatalyst for treating nitrophenol wastewater and treatment method for nitrophenol wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A method for preparing a photocatalyst for treating nitrophenol wastewater, comprising the following steps:

[0050] a. Modified ZSM-5 zeolite;

[0051] Get 1g of commercial ZSM-5 zeolite (silicon to aluminum ratio (SiO 2 / Al 2 o 3 )=18~30; Relative crystallinity: Na type>85%; Pore diameter: 5A°), placed in 70mL 0.35mol / L NaOH solution, stirred at room temperature for 30min; Treat at ℃ for 3.5h, filter and wash. Put the washed product in a beaker, add 40 mL of 0.5 mol / L sulfuric acid solution, stir at room temperature for 40 min, transfer to a water bath at 80 °C for 3 h, filter, wash, and dry in an oven at 110 °C for 12 h. Solid is ZSM-5 m ;

[0052] b. Preparation of nano-TiO 2 / Mesoporous ZSM-5 m composite photocatalyst.

[0053] Slowly add 10mL of tetrabutyl titanate dropwise to 24mL of absolute ethanol stirred on a magnetic heating stirrer to obtain a yellow transparent solution, which is component A; 20mL of absolute ethanol, 2ml of distilled water and 1....

Embodiment 2

[0057] A preparation method of a photocatalyst for treating nitrophenol wastewater is the same as in Example 1.

[0058] A treatment method for nitrophenol wastewater, comprising the following steps:

[0059] Nano TiO 2 / ZSM-5 m Synergistic degradation of nitrophenol wastewater by photocatalysis and sulfate radicals. 250mL, 50mg / L nitrophenol wastewater was placed in the reactor, and 0.3g nano-TiO 2 / Mesoporous ZSM-5 m Put the composite photocatalyst into the waste water, add 1.26mmol Na 2 S 2 o 8 and 0.54mmol ferrous sulfate, the reaction was initially stirred in a dark state for 30min to reach adsorption equilibrium, and then the nitrophenol wastewater was degraded under the irradiation of a 170W ultraviolet high-pressure mercury lamp for 40min, and the change in the absorbance of nitrophenol was measured to obtain nitrophenol The degradation rate of phenol was 89.7%.

Embodiment 3

[0061] A method for preparing a photocatalyst for treating nitrophenol wastewater, comprising the following steps:

[0062] a. Modified ZSM-5 zeolite;

[0063] Get 1g of commercial ZSM-5 zeolite (silicon to aluminum ratio (SiO 2 / Al 2 o 3 )=18~30; relative crystallinity: Na type>85%; pore size: 5A°), placed in 70mL 0.5mol / L NaOH solution, stirred at room temperature for 30min; ℃ for 4h, filtered and washed. Put the washed product in a beaker, add 50mL of 0.5mol / L sulfuric acid solution, stir at room temperature for 40min, transfer to a 90°C water bath for 4h, filter, wash, and then dry in a 110°C oven for 12h, the obtained Solid is ZSM-5 m ;

[0064] b. Preparation of nano-TiO 2 / Mesoporous ZSM-5 m composite photocatalyst.

[0065] Slowly add 10mL of tetrabutyl titanate dropwise to 24mL of absolute ethanol stirred on a magnetic heating stirrer to obtain a yellow transparent solution, which is component A; mix and stir 20mL of absolute ethanol, 2ml of distilled water a...

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Abstract

The invention provides a preparation method for a photocatalyst for treating nitrophenol wastewater and a treatment method for the nitrophenol wastewater. Compared with the prior art, the preparation method and the treatment method have the advantages that by modification of ZSM-5, the hole diameter of a molecular sieve is enlarged, more mesoporouses are provided, and the specific surface area and the hole capacity are enlarged; a secondary mesoporous molecular sieve (ZSM5) is prepared; nano TiO2 is synthesized by a sol-gel method and is loaded on the ZSM5 to prepare a composite catalyst with high performance; meanwhile, peroxysulphate is added in order to solve the problem that independent UV/TiO2 is low in oxidization capacity, so that a sulfate radical anion is generated by peroxysulphate under UV excitation and can develop higher oxidization capacity under cooperation with -OH. According to the preparation method and the treatment method, the photocatalysis action of nano TiO2/mesoporous ZSM-5 and the advanced oxidation action of the sulfate radical anion are combined, so that the photocatalysis treatment efficiency is improved, the treatment cost is reduced, and the characteristics of repeated use and green high efficiency are achieved.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a photocatalyst for treating nitrophenol wastewater and a treatment method for nitrophenol wastewater. Background technique [0002] Phenolic compounds are a class of refractory organic compounds, which mainly come from the chemical industry. Phenolic wastewater has a wide range of pollution and is increasingly polluting the environment, which has attracted great attention from the industry and the government. p-Nitrophenol (PNP) is one of the more common phenolic organic pollutants. It is usually detected in the industrial wastewater of industrial enterprises such as dyes, explosives, pesticides and plasticizers. Its nitro group is an electron-withdrawing group. The electron cloud density on the benzene ring is greatly reduced, and the electrophilic attack of oxidation is greatly hindered. Therefore, it has good chemical and biological stability, stays in the envi...

Claims

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Application Information

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IPC IPC(8): B01J29/40B01J35/10C02F1/32C02F1/58C02F1/72C02F101/38C02F101/34
Inventor 唐海沙俊鹏
Owner ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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