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Preparation of novel titanium-based lead dioxide electrode and advanced oxidation system with novel titanium-based lead dioxide electrode for cooperating with ferrous ions to activate persulfate through electrocatalysis

A lead dioxide and titanium-based technology, applied in the fields of oxidized water/sewage treatment, chemical instruments and methods, water pollutants, etc., can solve the problems of short electrode life and poor conductivity, and achieve improved utilization efficiency, long life, internal low stress effect

Inactive Publication Date: 2018-12-21
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mainly aiming at the poor conductivity and short life of the traditional titanium-based lead dioxide electrode, a new type of titanium-based lead dioxide electrode is prepared, which uses titanium material as the carrier, and the surface of the titanium substrate is tin-antimony oxide from the inside to the outside. The middle layer and the surface layer of fluorine-containing lead dioxide, through the anodic oxidation of the electrode coupled with chemical activation of persulfate to degrade pollutants in water and improve the utilization rate of ferrous ions

Method used

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  • Preparation of novel titanium-based lead dioxide electrode and advanced oxidation system with novel titanium-based lead dioxide electrode for cooperating with ferrous ions to activate persulfate through electrocatalysis
  • Preparation of novel titanium-based lead dioxide electrode and advanced oxidation system with novel titanium-based lead dioxide electrode for cooperating with ferrous ions to activate persulfate through electrocatalysis
  • Preparation of novel titanium-based lead dioxide electrode and advanced oxidation system with novel titanium-based lead dioxide electrode for cooperating with ferrous ions to activate persulfate through electrocatalysis

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Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1: a kind of preparation method of modified titanium-based lead dioxide electrode specifically comprises the following steps:

[0027] According to the preparation steps described in the technical route, the preparation of the tin antimony oxide intermediate layer is repeated coating, drying and pyrolysis 5 times, and the last pyrolysis is extended to 1h; the electrodeposition condition of the lead dioxide surface layer is that the electroplating solution is 0.5mol / LPb(NO 3 ) 2 , 0.04mol / LNaF, 0.1mol / L concentrated nitric acid, electrodeposition anode current density is 15mA / cm 2 , the deposition temperature is 55° C., and the deposition time is 20 min.

[0028] Carry out XRD measurement to the electrode material of above-mentioned gained, the collection of illustrative plates of gained is as follows figure 2 shown, and then compared with the JCPDSCard diffraction peak corresponding to rutile lead dioxide (β-PbO 2 ), it can be seen from the figure that ...

Embodiment 2

[0032] Embodiment 2: Comparing the influence of different reaction systems on the decolorization effect of Rhodamine B.

[0033] Establish different rhodamine B degradation systems:

[0034] PS system: only add 3.7mmol / L potassium persulfate as oxidant;

[0035] EC system: using a modified titanium-based lead dioxide electrode as the anode, Ti as the cathode, the electrode spacing is 2cm, and the applied electric field current density is 20mA / cm 2 ;

[0036] PS+EC system: using a modified titanium-based lead dioxide electrode as the anode, Ti as the cathode, the electrode spacing is 2cm, and the applied electric field current density is 20mA / cm 2 , 3.7mmol / L of potassium persulfate as oxidizing agent;

[0037] PS+Fe(Ⅱ) system: 3.7mmol / L potassium persulfate as oxidant, adding appropriate amount of FeSO 4 ·7H 2 O as a catalyst, n(S 2 o 8 2- ):n(Fe 2+ )=1:1;

[0038] PS+Fe(Ⅱ)+EC system: Based on the PS+Fe(Ⅱ) system, the modified titanium-based lead dioxide electrode is...

Embodiment 3

[0041] Example 3: Effect of free radical quencher on PS+Fe(II)+EC system rhodamine B decolorization effect

[0042] In order to explore the degradation mechanism of the PS+Fe(II)+EC system, 0.2 mol / L methanol (MeOH) and 0.2 mol / L tert-butanol (t-BuOH) were added to the system as free radical quenchers to investigate the The influence of the reaction system. Tert-butanol is the capture agent of OH, and the reaction rate constant is 3.8-7.6×10 8 m -1 S -1 , methanol contains α-H, which can be used as SO 4 － · and · OH scavengers, for SO 4 － · The capture rate constant is 1.6-7.7×10 7 m -1 S -1 , the capture rate constant for OH is 1.2–2.8×10 9 m -1 S -1 .

[0043] The result is as Figure 4 Shown: When no free radical quencher is added, the degradation efficiency of rhodamine B reaches 100% within 25 minutes, and when methanol and tert-butanol are added to the system, the degradation efficiency drops to about 30% and 50% respectively , indicating that SO 4 － Bot...

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Abstract

The invention provides preparation of a novel titanium-based lead dioxide electrode and an advanced oxidation system with the novel titanium-based lead dioxide electrode for cooperating with ferrous ions to activate persulfate through electrocatalysis, and belongs to the technical field of preparation of environmental electrochemical materials and wastewater treatment with advanced oxidation technologies. A titanium-based lead dioxide electrode with an added tin-antimony oxide intermediate layer is prepared and is taken as a positive pole, Ti is taken as a negative pole, persulfate is taken asan oxidant, and ferrous sulfate is taken as a catalyst; the novel titanium-based lead dioxide electrode is used for cooperating with the ferrous ions to activate the persulfate through electrocatalysis so as to generate sulfate radical anions and degrade pollutants in water. The preparation of the novel titanium-based lead dioxide electrode and the advanced oxidation system for cooperating with the ferrous ions to activate the persulfate through electrocatalysis have the beneficial effects that the prepared novel titanium-based lead dioxide electrode has low production cost, and is high in catalysis activity, small in internal stress and long in service life; the novel titanium-based lead dioxide electrode can be used for cooperating with the ferrous ions to activate the persulfate through electrocatalysis so as to generate the sulfate radical anions and efficiently remove the pollutants; meanwhile, an externally-applied electric field is capable of reducing the oxidized ferrous ions,improving the recycling efficiency of the ferrous ions and reducing addition quantity of the ferrous ions.

Description

technical field [0001] The invention belongs to the technical field of environmental electrochemical material preparation and advanced oxidation technology for wastewater treatment, and relates to the preparation of a novel modified titanium-based lead dioxide anode, which is used in an advanced oxidation system that cooperates with ferrous ions to activate persulfate. Efficient removal of pollutants in water through the combined action of anodic oxidation and advanced oxidation of sulfate radicals. Background technique [0002] The research on advanced oxidation of sulfate radicals began in the middle of the 20th century. With the deepening of research, the application of the oxidation ability of sulfate radicals to degrade organic matter has become the focus of development in the field of advanced oxidation. Under acidic conditions, SO 4 － The oxidation-reduction potential of ·OH is similar to that of ·OH, but under neutral conditions, its oxidation-reduction potential i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/467C02F1/72C02F101/30
CPCC02F1/46109C02F1/4672C02F1/72C02F2001/46142C02F2101/308
Inventor 张国权徐子媛杨凤林
Owner DALIAN UNIV OF TECH