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Rare earth doped Ti-based manganese dioxide electrode and preparation method thereof

A manganese dioxide electrode and rare earth element technology, applied in the field of materials, can solve the problems of unsatisfactory electrode conductivity, stability and catalytic activity, unsatisfactory electrode stability, easy to be polluted, etc., and achieve electrical conductivity and electrocatalysis. High activity, low cost, and the effect of improving catalytic activity

Inactive Publication Date: 2011-10-26
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The currently used DSA (titanium-based metal oxide electrode) electrodes mainly include ruthenium, iridium, tin, lead, manganese, etc. Ti / RuO 2 Electrodes and Ti / irO 2 The electrode belongs to the noble metal electrode, Ti / SnO 2 Electrode stability is not ideal, Ti / PbO 2 The lead in the electrode may dissolve and cause secondary pollution, BDD (boron-doped diamond electrode) is too expensive and easy to be polluted, etc.; Ti / MnO 2 The electrode has a strong oxidation ability for dyes, phenolic substances, endocrine disruptors, etc., and can also be used to treat wastewater containing heavy metal ions, so it has a strong application prospect in the environmental field
But Ti / MnO 2 The conductivity, stability and catalytic activity of the electrode are not ideal enough. The addition of the intermediate layer and the effect of the rare earth element doped manganese dioxide coating are aimed at this problem.

Method used

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  • Rare earth doped Ti-based manganese dioxide electrode and preparation method thereof
  • Rare earth doped Ti-based manganese dioxide electrode and preparation method thereof
  • Rare earth doped Ti-based manganese dioxide electrode and preparation method thereof

Examples

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Embodiment 1

[0044] The preparation of 5% cerium-doped titanium-based manganese dioxide electrode comprises the following steps:

[0045] (1), pretreatment of titanium substrate

[0046] 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;

[0047] (2) Preparation of tin antimony oxide intermediate layer

[0048] Take SnCl 4 ·5H 2 O0.85g, SbCl 3 Mix 0.15g, HCl (36%) 1mL, and n-butanol 4ml as a coating solution, brush the coating solution evenly on the surface of the titanium substrate with a brush, sinter at 500°C for 1...

Embodiment 2

[0052] The preparation of 10% cerium-doped titanium-based manganese dioxide electrode comprises the following steps:

[0053](1), pretreatment of titanium substrate (same as Example 1);

[0054] (2), preparation of tin antimony oxide intermediate layer (same as embodiment 1);

[0055] (3) Preparation of rare earth element doped manganese dioxide surface coating

[0056] 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 10% cerium-doped titanium-based manganese dioxide electrode of the present invention, the surface coating thickness of which is ab...

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Abstract

The invention discloses a rare earth cerium doped Ti-based manganese dioxide electrocatalytic electrode and a preparation method thereof. The electrode consists of an internal layer of Ti substrate, an interlayer of tin-antimony oxide and a surface coating of cerium doped manganese dioxide, wherein, the internal layer of Ti substrate is a pure titanium plate, the interlayer of tin-antimony oxide is a mixture consisting of SnO2 and Sb2O5, the molar ratio of tin to antimony is 3.7:1, and in the surface coating, the molar ratio of cerium to manganese dioxide is 1:25-50. The preparation method comprises the following steps: polishing, alkali washing, pickling and acid embossing the pure titanium plate, then repeatedly painting a coating solution, carrying out a thermal decomposition process on the Ti substrate to prepare the interlayer of tin-antimony oxide and the surface coating of cerium doped manganese dioxide in order. The cerium doped Ti-based manganese dioxide electrode disclosed in the invention has low potential of chlorine evolution and high electrocatalysis capability, and can be used for treating the dyeing and finishing effluents.

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 rare earth element cerium-doped titanium-based manganese dioxide electrocatalytic electrode and a preparation method thereof. Background technique [0002] Electrochemical technology has a good application prospect in the field of water treatment because of its unique electrocatalytic function, good treatment effect and good compatibility. In many aspects of electrochemical technology, the development of electrodes is a key. How to develop water treatment electrodes with low cost, low toxicity, environmental friendliness and high electrocatalytic activity is the focus of scientific and technological researchers. [0003] The currently used DSA (titanium-based metal oxide electrode) electrodes mainly include ruthenium, iridium, tin, lead, manganese, etc. Ti / RuO 2 Electrodes and Ti / irO 2 The electrode belongs to the noble meta...

Claims

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Application Information

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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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