Preparation method titanium-based polyaniline-doped lead dioxide composite electrode material

A composite electrode and lead dioxide technology, applied in chemical instruments and methods, water treatment parameter control, water pollutants, etc., can solve the problem of large doping amount of PTFE resistivity, current efficiency and energy consumption of composite electrode conductive organic wastewater Adverse effects and other issues can be achieved to reduce process complexity, avoid uncertainty, and increase feasibility

Inactive Publication Date: 2016-10-26
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
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Problems solved by technology

However, the existing PTFE-doped modified PbO 2 There are also certain problems in electrode material technology, because PTFE has a high resistivity and a large amount of doping (4.0~6.0g L -1 ), it is bound to PbO 2 The conductivity of the composite electrode, the current efficiency and energy consumption of electro-oxidative degradation of organic wastewater have adverse effects

Method used

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  • Preparation method titanium-based polyaniline-doped lead dioxide composite electrode material
  • Preparation method titanium-based polyaniline-doped lead dioxide composite electrode material
  • Preparation method titanium-based polyaniline-doped lead dioxide composite electrode material

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Embodiment 1

[0026] The present embodiment adopts the Ti / PbO prepared by the method of the present invention 2 / PANi-PbO 2 The composite electrode material is the anode, the stainless steel plate with the same area is the cathode, and the distance between the plates is 3cm, and the electrochemical oxidation and degradation treatment of the simulated phenol wastewater is carried out. The volume of the simulated wastewater is 150ml, the initial concentration of phenol is 100mg / L, at 10mA / cm 2 After 180 minutes under the action of electric current, the removal rate of phenol reaches 95.24%, and the removal rate of COD is 55%, which is higher than that of general PbO without polyaniline 2 Electrodes improved by 10%.

Embodiment 2

[0028] In this embodiment, the electrochemical polarization curve test is carried out on the electrode material prepared by the method of the present invention. The test uses a platinum sheet as the counter electrode, and a saturated calomel electrode as the reference electrode, at a current density of 1A / cm 2 , the electrolyte is 1M H 2 SO 4 solution, at a temperature of 30 °C, and with general PbO of undoped PANI 2 Electrodes were compared and the results were as follows Figure 5 shown. It can be seen that the oxygen evolution potential of the electrode prepared by the method of the present invention is positively shifted, and the oxygen evolution current is reduced, indicating that polyaniline doping can effectively improve the concentration of PbO. 2 The oxygen evolution overpotential of the electrode can inhibit the occurrence of oxygen evolution side reactions.

Embodiment 3

[0030] In this embodiment, the electrode material prepared by the method of the present invention is the anode, the stainless steel plate is the cathode, and the distance between the plates is 4cm, placed in a plexiglass electrolytic cell, containing 300ml of H at a concentration of 1mol / L in the cell 2 SO 4 solution, connected to a DC power supply, at a current density of 10mA / cm 2 , after polarizing for 12 hours at 30°C, samples were taken, and the concentration of lead dissolved in the solution during the anodic polarization was detected by a graphite furnace atomic absorption spectrometer. Based on this, the dissolution stability of the electrode was evaluated, and compared with the general PbO 2 Electrodes and doping 6.0g L -1 PTFE-PbO 2 electrodes for comparison. The experimental results show that the average dissolution rate of lead under the anodic polarization of the electrode prepared by the method of the present invention is 1.417×10 -3 mg·h -1 cm -2 , while ...

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Abstract

The invention relates to a preparation method of a titanium-based polyaniline-doped lead dioxide composite electrode material. The preparation method includes: pretreating a titanium substrate, preparing a PbO2 interlayer and preparing a polyaniline-doped PbO2 surface active layer, to be more specific, dispersing conductive polyaniline particles into an electrodeposition solution, using a composite electrodeposition method to evenly co-deposit polyaniline and PbO2 onto Ti/PbO2, and controlling conditions such as polyaniline use amount, deposition current density and deposition temperature and time to obtain the Ti/PbO2/PANi-PbO2 composite electrode material with a compact and even surface and evidently refined grains. The preparation method has the advantages that the adverse effect of non-conductive polymer doping on PbO2 conductivity is overcome, the use of polyaniline monomer is avoided, many uncertainties of the doping using the monomer electropolymerization reaction are avoided, and the performance stability of the polyaniline-doped PbO2 electrode material is guaranteed; the obtained electrode material is high in activity and stability, the dissolving stability of the obtained electrode material is evidently better than an undoped PbO2 electrode, and application safety of the PbO2 electrode in the electrooxidation treatment of non-biodegradable organic wastewater.

Description

technical field [0001] The invention belongs to the technical field of preparation of novel electrode materials, and in particular relates to a preparation method of a composite electrode material doped with titanium-based polyaniline and lead dioxide. Background technique [0002] The key to the removal of toxic and refractory organics from industrial wastewater during the electrochemical oxidation process is the electrode material with electrocatalytic activity. High stability, high activity, and low cost are the properties that people expect electrode materials to possess. PbO 2 Due to its good electrical conductivity and corrosion resistance, high oxygen evolution overpotential, low cost and strong oxidation ability, the electrode is one of the electrode materials with the longest research and application history and the most extensive oxidation removal of organic matter. with broadly application foreground. PbO 2 The electrode is generally supported by an inactive T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F101/30
CPCC02F1/46109C02F1/4672C02F2001/46142C02F2001/46138C02F2101/30C02F2101/345C02F2209/08
Inventor 于丽花薛娟琴代继哲毕强唐长斌
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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