Method for treating printing and dyeing wastewater with rare earth cerium doped titanium-based manganese dioxide electrode

A technology of manganese dioxide electrode and printing and dyeing wastewater, which is applied in the field of materials, can solve the problems of long treatment cycle and low treatment efficiency, and achieve the effects of less secondary pollution, high removal efficiency and fast speed

Inactive Publication Date: 2013-04-10
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

[0004] In order to solve the problems of long treatment period and low treatment efficiency in the above-mentioned printing and dyeing wastewater treatment, the present invention provides a titanium-based dioxide doped with rare earth cerium A method for treating printing and dyeing wastewater with manganese electrodes, which has the characteristics of short treatment cycle and high treatment efficiency

Method used

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  • Method for treating printing and dyeing wastewater with rare earth cerium doped titanium-based manganese dioxide electrode
  • Method for treating printing and dyeing wastewater with rare earth cerium doped titanium-based manganese dioxide electrode
  • Method for treating printing and dyeing wastewater with rare earth cerium doped titanium-based manganese dioxide electrode

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Experimental program
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Effect test

Embodiment 1

[0040] The preparation of titanium-based manganese dioxide electrode (abbreviated as TSM-5 electrode) doped with 5% cerium concentration includes the following steps:

[0041] (1), pretreatment of titanium substrate

[0042] That is, use 200#, 600#, 1200#, 1500# metallographic sandpaper to polish the surface of the titanium substrate in sequence until it is smooth and smooth, then use saturated sodium hydroxide solution to boil for 30 minutes for degreasing treatment, and then use 1:1 nitric acid + Soak in sulfuric acid for 2 hours, then acid-etch in 10% oxalic acid solution for about 25 minutes, wait until the reddish-brown substance appears to form a pitted titanium matrix, and finally wash with deionized water and soak in absolute ethanol;

[0043] (2) Preparation of tin antimony oxide intermediate layer

[0044] Take SnCl 4 ·5H 2 O0.85g, SbCl 3 0.15g, HCl (36%) 1mL, n-butanol 4ml to prepare the middle layer coating solution, brush the coating solution evenly on the su...

Embodiment 2

[0048] The preparation of titanium-based manganese dioxide electrode (abbreviated as TSM-10 electrode) doped with 10% cerium concentration includes the following steps:

[0049] (1), pretreatment of titanium substrate (same as Example 1);

[0050] (2), preparation of tin antimony oxide intermediate layer (same as embodiment 1);

[0051] (3) Preparation of rare earth element doped manganese dioxide surface coating

[0052] Using 50wt% Mn (NO 3 ) 2 Solution, according to the molar ratio of manganese and cerium of 25:1, add cerium nitrate, dilute with distilled water to prepare 1mol dm -3 Use a brush to evenly coat the surface layer coating solution on the electrode surface with the prepared intermediate layer, dry it at 90°C for 10 minutes, and then thermally decompose it at 200°C for 5 minutes. This process is repeated 30 times , and finally sintered at 350° C. for 20 minutes to finally obtain the TSM-10 electrode of the present invention, the surface coating thickness of whi...

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Abstract

The invention discloses a method for treating printing and dyeing wastewater by using a rare earth cerium-doped titanium-based manganese dioxide electrode. Wherein the electrode is composed of an inner titanium substrate, an intermediate layer of tin antimony oxide and a surface coating of rare earth cerium doped manganese dioxide; the treatment method is to use a rare earth cerium doped titanium-based manganese dioxide electrode as an anode, titanium The plate is the cathode, the distance between the electrode plates is 2.5-7cm, the concentration of sodium chloride in the electrolyte is 0.1mol / L, the pH is 8-10, the current density is 30mA / cm2, and the electrolysis time is 1-1.5h. When the heterotitanium-based manganese dioxide electrode is used to treat the simulated printing and dyeing wastewater, the chromaticity removal rate of the wastewater reaches more than 96%, and the COD removal rate reaches 84%-91%.

Description

technical field [0001] The invention belongs to the field of materials and the technical field of wastewater treatment, and in particular relates to a method for treating printing and dyeing wastewater by using a rare earth cerium-doped titanium-based manganese dioxide electrocatalytic electrode. Background technique [0002] The printing and dyeing industry is a major player in wastewater discharge, and its annual wastewater discharge accounts for more than 1 / 10 of the total industrial wastewater. It is one of the main sources of water pollution. The treatment of printing and dyeing wastewater has always been a difficult point in industrial wastewater. It has the characteristics of large chroma, high content of organic pollutants, large changes in water quality, complex components and biodegradable substances. [0003] In recent years, due to the development and use of many new raw materials, new dyes, and new auxiliaries in the printing and dyeing industry, the treatment ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461
Inventor 周笑绿谭小文张艳艳李环商菲
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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