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ti/sno 2 Electrode and preparation method and application

A technology of electrodes and coated electrodes, which is applied in the field of Ti/SnO2 electrodes and its preparation, can solve the problems of high cost, short electrode life, complex electrode preparation process, etc., and achieve long service life, long electrode life, and stable electrode performance Effect

Inactive Publication Date: 2017-01-18
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of above-mentioned deficiencies in the prior art, the object of the present invention is to provide a kind of Ti / SnO 2 Electrode and its preparation method and application, Ti / SnO 2 Electrode can be used for electrooxidation to remove perfluorinated organic pollutants in wastewater, Ti / SnO 2 The preparation method of the electrode is simple, and the preparation method is to prepare a sol-gel by using only tin fluoride as a precursor, coat a high-temperature sintering on a titanium substrate, and prepare Ti / SnO 2 The electrode already has the performance of electrooxidative degradation of PFOA, and the non-conductive SnO can be made without following the conventional Sb-doped process. 2 Possess electro-oxidation properties, thereby solving the existing Ti / SnO that degrades perfluorinated organic pollutants by electro-oxidation 2 - The preparation process of Sb-type electrodes is complex, the electrode life is not long, and multiple doping is required, resulting in high costs and other issues

Method used

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  • ti/sno <sub>2</sub> Electrode and preparation method and application
  • ti/sno <sub>2</sub> Electrode and preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1: SnF 4 Precursor preparation of Ti / SnO 2 -F Electrode Oxidation Degradation of PFOA in Wastewater

[0052] A titanium plate with a cutting size of 50×60×3mm was polished with coarse and fine sandpaper, then heated in a concentrated alkali solution to remove oil, then replaced with water for ultrasonic cleaning, and then placed in a hot oxalic acid solution to remove the surface oxide film. When preparing the coating solution, heat, mix and dissolve ethylene glycol and citric acid, and add SnF 4 into the solution, heated and stirred to obtain a sol-gel solution. Subsequently, the pretreated Ti plates were soaked in the sol-gel solution. After taking it out, it is dried and then sintered at high temperature. The coating and heat treatment steps are repeated 20 times. After the muffle furnace sintering was completed for the 20th time, the titanium plate was sintered at 500°C for 2 hours.

[0053] Ti / SnO 2 - After the preparation of the F electrode is comple...

Embodiment 2

[0054] Example 2: SnCl 4 Precursor preparation of Ti / SnO 2 Oxidation Degradation of PFOA in Wastewater by -Cl Electrode

[0055] with SnCl 4 Preparation of Ti / SnO as precursor 2 -Cl electrode, other conditions are the same as embodiment 1, and the difference is that ethylene glycol in molar ratio: citric acid: tin chloride=140:30:9, add SnCl 4 ·5H 2 O into the solution to prepare a sol-gel solution. The result of oxidation of PFOA after it is prepared into an electrode is as follows figure 1 As shown, the degradation efficiency of PFOA is slightly lower than that of Ti / SnO 2 -F electrode, but also significantly higher than conventional Ti / SnO 2 -Sb electrodes, alternatively, Ti / SnO 2 -Cl electrode life over 180h (see figure 2 ).

Embodiment 3

[0056] Example 3: SnBr 4Precursor preparation of Ti / SnO 2 Oxidative degradation of PFOA in wastewater by -Br electrode

[0057] SnBr 4 Preparation of Ti / SnO as precursor 2 -Br electrode, other conditions are the same as embodiment 1, and difference is ethylene glycol in molar ratio: citric acid: tin bromide=140:30:9, add SnBr 4 into the solution to prepare a sol-gel solution. Ti / SnO prepared in this embodiment 2 -Br electrode used for electrooxidative degradation of PFOA results such as figure 1 As shown, the degradation efficiency of PFOA is lower than that of Ti / SnO 2 -F electrode, but also significantly higher than conventional Ti / SnO 2 -Sb electrodes, alternatively, Ti / SnO 2 -The life of the Br electrode is short, only 17h (see figure 2 ).

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Abstract

The invention discloses a Ti / SnO2 electrode as well as a preparation method and an application. The preparation method comprises the following steps: preparing sol-gel liquid: heating citric acid and alcohol and uniformly mixing to obtain an acid-alcohol solution; and putting halogenated tin solid powder into the acid-alcohol solution, heating and stirring to obtain the sol-gel solution; preparing a coated electrode: immersing a titanium substrate in the sol-gel solution, carrying out dip coating, taking out, drying, sintering at high temperature and repeatedly carrying out dip coating, drying and sintering at high temperature on the titanium substrate for many times. The preparation method of the Ti / SnO2 electrode disclosed by the invention is simple and feasible, efficient and stable, the re-doping of other metal ions such as antimony, cerium and manganese in SnO2 is not needed according to the current report and the Ti / SnO2 electrode has significantly longer electrode service life than that of the Ti / SnO2-Sb electrode and the like.

Description

technical field [0001] The invention relates to the technical field of organic wastewater treatment, in particular to a Ti / SnO 2 Electrode and its preparation method and application, Ti / SnO 2 The electrode can be used for electrooxidative degradation of perfluorinated organic pollutants in wastewater. Background technique [0002] Perfluorooctanoic acid (PFOA) is the main type of perfluorinated compounds synthesized and used at present. Because of its extremely stable chemical properties and hydrophobic and oleophobic properties, it is widely used as surfactants, foaming agents, lubricants, protective coatings, Insecticides and synthetic drugs, fluorine rubber, resin intermediates, etc. However, with its widespread use, its existence has been detected in the global ecological environment and in human animals in recent years, and its harm to the ecological environment and human health has gradually been recognized. This type of organic matter has become the focus of environ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461C02F101/30
CPCC02F1/46109C02F1/4672C02F2001/46138C02F2001/46152C02F2101/36
Inventor 杨波蒋超金余刚邓述波刘剑洪
Owner SHENZHEN UNIV
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