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Transition-metal doped lead dioxide electrode for wastewater treatment as well as preparation method and application thereof

A transition metal, lead dioxide technology, applied in water/sewage treatment, natural water treatment, chemical instruments and methods, etc., can solve the problems of limited rare earth reserves, low catalytic oxidation efficiency, short electrode life, etc., and achieve the removal effect. Good, low price, the effect of improving catalytic activity

Inactive Publication Date: 2016-06-01
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In contrast, RuO 2 , IrO 2 The catalytic oxidation efficiency of this kind of metal oxide electrode for organic pollutants is not high; TiO 2 Oxide materials are research hotspots in recent years, but they are more suitable for photocatalytic oxidation materials or photocatalytic oxidation electrode materials; tin dioxide electrodes have an obvious defect: the electrode life is too short
At present, rare earth doped electrodes can have various effects, but the current global rare earth reserves are limited, and the research and development of rare earth replacement products is imminent

Method used

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  • Transition-metal doped lead dioxide electrode for wastewater treatment as well as preparation method and application thereof
  • Transition-metal doped lead dioxide electrode for wastewater treatment as well as preparation method and application thereof
  • Transition-metal doped lead dioxide electrode for wastewater treatment as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A preparation method of a transition metal nickel-doped lead dioxide electrode. The nickel-doped lead dioxide electrode uses a titanium sheet as a substrate. The treated titanium substrate was prepared by brushing and pyrolysis to prepare the bottom layer of tin antimony oxide, and then in the prepared electroplating solution, α-PbO was sequentially plated by electrodeposition method. 2 Intermediate layer and fluorine-containing β-PbO doped with a certain amount of nickel 2 active layer.

[0042] The concrete steps of described method are as follows:

[0043] (1) Titanium substrate pretreatment: the thickness is 0.1mm, the size is 14cm 2 (2cm×7cm) of pure titanium sheet with 120 # 、600 # and 1200 # Grind with sandpaper to make the surface appear silver-white metallic luster, then rinse with deionized water; soak in 40% NaOH solution for 30min, take it out and rinse with deionized water; then rinse with 20% H 2 SO 4 Soak the solution at 60°C for 20min, take it out...

Embodiment 2

[0055] The preparation method of the electrode is the same as in Example 1, except that in step (4), the acidic electroplating solution is 500mL mixed with 0.003molL -1 Zn(NO 3 ) 2 ·6H 2 O, 0.3molL -1 Pb(NO 3 ) 2 , 0.01molL -1 KF·2H 2 O, 2mL mass fraction is 60% fluororesin emulsion (PTFE), the pH value is adjusted to 1.8 with nitric acid (65wt%), and solvent is water. A zinc-doped lead dioxide electrode was prepared.

[0056] Using the prepared zinc-doped lead dioxide electrode as the anode, process 500mgL -1 Aspirin solution, method is as embodiment 1, after reaction carries out 2.5h, the removal rate of the aspirin of zinc-doped lead dioxide electrode reaches 78.23%, is 1.22 times of undoped lead dioxide electrode; The removal rate of COD is 50.23% , 1.15 times that of the undoped lead dioxide electrode.

Embodiment 3

[0058] The preparation method of the electrode is the same as in Example 1, except that in step (4), the acidic electroplating solution is 500mL mixed with 0.012molL -1 Mn(NO 3 ) 2 , 0.3molL -1 Pb(NO 3 ) 2 , 0.01molL -1 KF·2H 2 O, 2mL mass fraction is 60% fluororesin emulsion (PTFE), the pH value is adjusted to 1.8 with nitric acid (65wt%), and solvent is water. A manganese-doped lead dioxide electrode was prepared.

[0059] The prepared manganese-doped lead dioxide electrode or undoped lead dioxide electrode is used as the anode, and the titanium sheet is used as the cathode, and the electrode area is 14cm 2 , electrochemical degradation using constant current electrolysis. The constant current density is 30mAcm -2 , the electrode spacing is 4cm, to contain 0.1molL -1 Electrolyte Na 2 SO 4 1000mgL -1 Diclofenac sodium is a simulated wastewater with a reaction volume of 250mL. Under the action of magnetic stirring, the wastewater is treated, and the degradation re...

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Abstract

The invention discloses a transition-metal doped lead dioxide electrode for wastewater treatment and a preparation method thereof. The transition-metal doped lead dioxide electrode is prepared through the steps of performing thermal decomposition on a titanium material which serves as a substrate so as to prepare a tin-antimony oxide underlayer, then electroplating an alpha-PbO2 interlayer by use of an alkaline solution and finally preparing a transition-metal doped fluorine-containing beta-PbO2 surface active layer by use of acidic composite electroplating bath. The transition-metal doped lead dioxide electrode prepared by the method has the characteristics of low price, high oxygen evolution potential, high catalytic activity, long service life and the like; the electrode can be used for realizing effective removal of organic pollutants in wastewater through an electrochemical oxidation method, is simple to operate and convenient to manage and has wide social and economic benefits.

Description

(1) Technical field [0001] The invention relates to a transition metal-doped lead dioxide electrode for wastewater treatment and a preparation method thereof, belonging to the technical fields of material chemistry, environmental electrochemistry and wastewater treatment. (2) Background technology [0002] Electrocatalytic oxidation is a process in which hydroxyl radicals generated at the anode are used as the main oxidant to gradually degrade refractory organic pollutants into small organic molecular intermediates and finally mineralized into carbon dioxide and water by using its strong oxidizing properties. Electrocatalytic oxidation technology has the advantages of no or little consumption of chemical reagents, no secondary pollution, simple operation, strong oxidation ability, mild reaction conditions, and small footprint. Called environment-friendly technology. The key and core of the electrocatalytic oxidation technology lies in the performance of the electrode materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C23C28/00C23C18/12C25D9/08
CPCC02F1/46109C02F2001/46142C02F2103/343C23C18/1216C23C18/1241C23C18/1254C23C28/324C23C28/345C25D9/08
Inventor 戴启洲陈建孟夏伊静
Owner ZHEJIANG UNIV OF TECH
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