Process for degrading wastewater through N-doped coated TiO2 photocatalyst

Abstract

The invention discloses a process for degrading wastewater through an N-doped coated TiO2 photocatalyst. The adopted visible-light-induced photocatalyst is an N-doped disordered nano coated TiO2 photocatalyst. According to the catalyst, disordered nano coated TiO2 with a thin multi-layer core-shell structure is prepared first, N is doped in situ in crystal lattices, and due to the structural specificity and doping of the element N, photocatalytic degradation activity of TiO2 on organic dyes is improved. According to the process disclosed by the invention, the problem in the prior art that dyestuff wastewater is low in degradation efficiency is solved, and the process is applicable to organic dyes in contaminated water.

Description

technical field

[0001] The invention relates to a treatment process for photocatalytic degradation of dye wastewater, which uses N-doped disordered nano-encapsulated TiO 2 Photocatalyst, the special structure of the photocatalyst and the N element in TiO 2 Interlattice doping significantly enhances the TiO 2 The visible light catalytic activity of the photocatalyst has the advantages of simple operation, low cost and high degradation efficiency. Background technique

[0002] In the process of textile printing and dyeing, a large number of auxiliaries that pollute the environment and are harmful to the human body are used. Most of these auxiliaries are discharged in the form of liquid, which inevitably enters the water environment and causes water pollution. For example, Rhodamine B dyes are carcinogenic and mutagenic. Wastewater containing Rhodamine B has deep chroma, high content of organic pollutants, and poor biodegradability. It is difficult to treat with conventional ...

Examples

Embodiment 1

[0031] 1. Disordered nano-encapsulated TiO 2 Preparation of:

[0032] a. TiO2 and NaBH 4 Mix and grind for 0.5h to obtain a mixture, the TiO 2 with NaBH 4 The mass ratio is 1:0.65;

[0033] b. Transfer the mixture obtained in step a into an alumina crucible, then place it in a tube furnace, raise the temperature from room temperature to 350°C at a rate of 10°C / min under a nitrogen atmosphere, and maintain it under this condition for 0.5h, and then Furnace is cooled to room temperature, obtains the powder after reaction;

[0034] c. Transfer the powder obtained in step b into an alumina crucible, then place it in a tube furnace, raise the temperature from room temperature to 400°C at a rate of 10°C / min under an argon atmosphere, and maintain it under this condition for 0.5h, then Cool to room temperature with the furnace, and wash with ethanol and water several times and dry to obtain the powder A after reaction;

[0035] d, the powder A obtained in step c is mixed with N...

technical field

[0001] The invention relates to a treatment process for photocatalytic degradation of dye wastewater, which uses N-doped disordered nano-encapsulated TiO 2 Photocatalyst, the special structure of the photocatalyst and the N element in TiO 2 Interlattice doping significantly enhances the TiO 2 The visible light catalytic activity of the photocatalyst has the advantages of simple operation, low cost and high degradation efficiency. Background technique

[0002] In the process of textile printing and dyeing, a large number of auxiliaries that pollute the environment and are harmful to the human body are used. Most of these auxiliaries are discharged in the form of liquid, which inevitably enters the water environment and causes water pollution. For example, Rhodamine B dyes are carcinogenic and mutagenic. Wastewater containing Rhodamine B has deep chroma, high content of organic pollutants, and poor biodegradability. It is difficult to treat with conventional ...

Examples

Embodiment 1

[0031] 1. Disordered nano-encapsulated TiO 2 Preparation of:

[0032] a. TiO2 and NaBH 4 Mix and grind for 0.5h to obtain a mixture, the TiO 2 with NaBH 4 The mass ratio is 1:0.65;

[0033] b. Transfer the mixture obtained in step a into an alumina crucible, then place it in a tube furnace, raise the temperature from room temperature to 350°C at a rate of 10°C / min under a nitrogen atmosphere, and maintain it under this condition for 0.5h, and then Furnace is cooled to room temperature, obtains the powder after reaction;

[0034] c. Transfer the powder obtained in step b into an alumina crucible, then place it in a tube furnace, raise the temperature from room temperature to 400°C at a rate of 10°C / min under an argon atmosphere, and maintain it under this condition for 0.5h, then Cool to room temperature with the furnace, and wash with ethanol and water several times and dry to obtain the powder A after reaction;

[0035] d, the powder A obtained in step c is mixed with N...

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