Preparation method and application of high-efficiency titanium-based ferrous molybdate electrode

An electrode and substrate technology, which is applied to the preparation of high-efficiency titanium-based ferrous molybdate electrodes and the removal of organic pollutants in water, can solve the problems of short electrode service life, easy diffusion of oxygen atoms, complicated preparation process, etc., and achieve electrode performance. The effect of stability, firm bonding and simple preparation process

Active Publication Date: 2022-05-10
DONGGUAN UNIV OF TECH
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  • Claims
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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

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  • Preparation method and application of high-efficiency titanium-based ferrous molybdate electrode
  • Preparation method and application of high-efficiency 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 into 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, wash...

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 present invention relates to a kind of Ti / FeMoO 4 The preparation method of the electrode includes: S1, pretreating the porous titanium substrate; S2, the preparation of Ti / Fe(OH)F: ferric salt, soluble fluoride, small molecule template agent, and hydrazine in a ratio of 1: 2.0~3.5:4~8:5~10 molar ratio dissolve in water, stir evenly; transfer the mixed solution to the reaction kettle, and S1 pretreated porous titanium, stir with a mechanical stirrer for 20min, then transfer to a certain temperature T1 In an oven, react for 3-7 hours; after cooling, take out the titanium sheet, wash it with water, and dry it in vacuum for 2 hours; S3, Ti / FeMoO 4 Preparation: Weigh a certain amount of Na 2 MoO 4 2H 2 O dissolved in water, the Ti / Fe(OH)F prepared by S2 was mixed with Na 2 MoO 4 Transfer the solution to the reaction kettle together, stir it with a mechanical stirrer for 10 minutes, seal it and put it in a drying oven, and react it at a certain temperature T2 for a certain period of time; after cooling down to room temperature, take out the porous titanium and vacuum dry it for 2 hours to obtain Ti / FeMoO 4 electrode. The electrode prepared by the invention has a multi-level structure, its preparation method is green and simple, and it is used as a cathode to treat organic wastewater with good decontamination effect.

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 Patents(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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