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Preparation method and application of efficient titanium-based ferrous molybdate electrode

An electrode and base material technology, which is applied in the field of preparation of high-efficiency titanium-based ferrous molybdate electrodes and the removal of organic pollutants in water, can solve the problems of short service life of electrodes, complicated preparation process, easy diffusion of oxygen atoms, etc., and achieve electrode performance Stability, simple preparation process, and firm combination

Active Publication Date: 2019-11-26
DONGGUAN UNIV OF TECH
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  • Description
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AI Technical Summary

Problems solved by technology

[0004] Among the preparation methods of titanium-based stable electrodes, gel-sol-high-temperature sintering is the most commonly used method for loading metal oxides on Ti substrates. This process requires repeated coating-drying-calcining, and the preparation process is complicated. Oxygen atoms easily diffuse to the titanium substrate during use, resulting in the formation of a non-conductive film between the metal oxide and the Ti substrate, and cracking and falling off of the oxide, resulting in a short service life of this type of electrode

Method used

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  • Preparation method and application of efficient titanium-based ferrous molybdate electrode
  • Preparation method and application of efficient titanium-based ferrous molybdate electrode

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preparation example Construction

[0036] S2 is the preparation step of Ti / Fe(OH)F: dissolving ferrous salt, soluble fluoride, small molecule template agent and hydrazine in the molar ratio of 1:2.0~3.5:4~8:5~10 In oxygen water, stir evenly; transfer the mixed solution to the reaction kettle in a glove box filled with nitrogen, and add S1 pretreated porous titanium, stir with a mechanical stirrer for 20 minutes, and then transfer it to an oven at a certain temperature T1, and react 3 ~7h; after cooling, take out the titanium sheet, wash it with water, and dry it in vacuum for 2h.

[0037] The ferrous salt is one of soluble ferrous salts such as ferrous sulfate, ferrous chloride and ferrous nitrate.

[0038] The soluble fluoride is NaF, KF, NH 4 One of the water-soluble fluorides such as F, whose main function is to form F-generation iron hydroxide and promote its combination with the titanium substrate. Preferably, in S2, the disoluble fluoride is NH 4 F.

[0039]The small molecule template agent is one of ...

Embodiment 1

[0047] Embodiment 1 prepares Ti / FeMoO with the method provided by the present invention 4 electrode

[0048] S1. Pretreatment of the porous titanium substrate: use sandpaper to polish the surface of the porous titanium substrate (5cm × 5mm × 1mm, with a pore size of 10 μm), put it in acetone and ultrasonically soak it to remove oil; then put it into 10% oxalic acid solution Heat and soak for 10 minutes to remove the oxide film on the surface; ultrasonically clean with ultrapure water and ethanol and dry for later use.

[0049] Preparation of S2, Ti / Fe(OH)F: Fe(NO 3 ) 2 ·6H 2 O, NH 4 F, glucose, hydrazine are dissolved in anaerobic water with the molar ratio of 1: 2.5: 5: 5, stir well; The mixed solution is transferred in the reactor in the glove box that is full of nitrogen, and the porous titanium of S1 pretreatment, with Stir with a mechanical stirrer for 20 minutes, then transfer to an oven at 170°C, and react for 5 hours; after cooling, take out the titanium sheet, wa...

Embodiment 2

[0052] With Ti / FeMoO provided by the present invention 4 Electrode degradation of printing and dyeing wastewater containing rhodamine B.

[0053] Ti / FeMoO prepared under the conditions of Example 1 of the present invention 4 The electrode is the cathode, the Pt sheet is the anode, and 0.1MNa is added 2 SO 4 As a supporting electrolyte, the constant current mode is used, and the current density is 10mA / cm 2 , the distance between the plates is 10mm, and the simulation of degrading rhodamine B containing 10mg / L can remove 98.7% of rhodamine B in 40min, and the effect is shown in Table 2.

[0054] time / min 0 10 20 30 Removal rate 0 68.3 92.5 99.9％

[0055] Compared with prior art, the beneficial effect of this method is:

[0056] 1. Compared with the traditional single metal oxide, the combination of Ti substrate and binary metal oxide greatly improves the conductivity and electrochemical activity. FeMoO 4 It is a hollow cubic structure, so the el...

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Abstract

The invention relates to a preparation method of a Ti / FeMoO4 electrode. The preparation method comprises the following steps: S1, preprocessing a porous titanium substrate; S2, preparing Ti / Fe(OH)F: dissolving a ferrous salt, a soluble fluoride, a micromolecular template and hydrazine in water according to a molar ratio of 1:(2.0-3.5):(4-8):(5-10), performing uniform stirring, transferring the obtained mixed solution into a reaction kettle, adding the pretreated porous titanium obtained in step S1, performing stirring for 20 min by using a mechanical stirrer, transferring the obtained mixtureinto an oven having a certain temperature of T1, performing a reaction for 3-7 h, taking out the obtained titanium sheet after cooling, washing the titanium sheet with water, and carrying out vacuum drying for 2 h; and S3, preparing Ti / FeMoO4: weighing a certain amount of Na2MoO4.2H2O, dissolving the Na2MoO4.2H2O in water, transferring the Ti / Fe (OH) F prepared in step S2 and the obtained Na2MoO4solution into the reaction kettle, performing stirring for 10 min by using the mechanical stirrer, sealing the reaction kettle, placing the reaction kettle in a drying box, performing a reaction at acertain temperature of T2 for a certain time, cooling the obtained reaction product to room temperature, taking out the obtained porous titanium, and carrying out vacuum drying for 2 h to obtain the Ti / FeMoO4 electrode. The electrode prepared in the invention has a multistage structure, the preparation method is green and simple, and the electrode has a good decontamination effect when used as a cathode for treating organic wastewater.

Description

technical field [0001] The invention belongs to the field of electrochemical water pollution control, and relates to a method for preparing a high-efficiency titanium-based ferrous molybdate electrode and removing organic pollutants in water. Background technique [0002] At present, electrochemical methods have been widely used in the treatment of organic wastewater. The reaction conditions are mild, easy to control, and low energy consumption. It is a research hotspot in the field of environmental technology. The performance of electrode materials is a key factor affecting the efficiency of electrochemical water treatment. Commonly used electrodes include platinum electrodes, boron-doped diamond electrodes (BDD), titanium-based oxide electrodes (Ti / Sn-SbO 2 、Ti / PbO 2 , Ti / MnO 2 )Wait. Although platinum electrodes and diamond electrodes have good oxidation performance and long service life, their production costs are high. Therefore, low-cost titanium-based oxide shape-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F101/38
CPCC02F1/46109C02F2001/46133C02F2101/308C02F2101/38
Inventor 张云飞牛军峰
Owner DONGGUAN UNIV OF TECH
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