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Preparation method of a one-dimensional single crystal rigid molecularly imprinted ZNO electrode

A technology of rigid molecules and electrodes, applied in the field of material chemistry, can solve problems such as the influence of imprinted expression repeatability, and achieve the effects of excellent imprinted expression effect, fast recognition ability, and excellent physical and chemical properties

Inactive Publication Date: 2015-07-29
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] We further consider that the usual inorganic photocatalyst disordered nanofilms (such as TiO 2 film) surface is often uneven, especially TiO 2 Photocatalysts often grow in the mixed crystal form of anatase and rutile, polycrystalline structure, and the recognition site of the target substance directly prepared on its surface may have a certain impact on the repeatability of imprinted expression

Method used

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  • Preparation method of a one-dimensional single crystal rigid molecularly imprinted ZNO electrode
  • Preparation method of a one-dimensional single crystal rigid molecularly imprinted ZNO electrode
  • Preparation method of a one-dimensional single crystal rigid molecularly imprinted ZNO electrode

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Embodiment 1

[0030] A method for preparing a one-dimensional single crystal rigid ZnO electrode, specifically comprising the following steps:

[0031] The surface of the pure metal titanium sheet is polished and polished with metallographic sandpaper, and the NH 4 F, 1.6-2.0wt% Na 2 SO 4 And in the solution of 10~50wt% polyethylene glycol (400), use titanium sheet as working electrode, platinum sheet as counter electrode, carry out electrochemical anodic oxidation treatment, the electrode that is prepared adopts temperature programming to carry out heat treatment in tube furnace , that is, heat treatment at 450-550°C for 3-5 hours at a heating rate of 1-5°C / min; 1-5mM Zn(CH 3 COO) 2 The ethanol solution was spin-coated on the Ti plate obtained by anodic oxidation pretreatment, the substrate was placed in a muffle furnace, and it was pyrolyzed at 300°C to 350°C for 0.5h to 1h in an air atmosphere to obtain dense and uniformly distributed ZnO seed layer. Equimolar Zn(NO 3 ) 2 and (CH ...

Embodiment 2

[0033] A method for preparing a one-dimensional single-crystal rigid molecularly imprinted ZnO electrode with highly selective photocatalytic oxidation performance, specifically comprising the following steps:

[0034] The preparation method is similar to that described in Example 1, except that 1.00-2.00 mmol / L of template substances need to be added to the configuration of the hydrothermal reaction solution. The substances studied in this patent are phenol, p-hydroxybenzoic acid, and bisphenol A, 2,4-dihydroxybenzoic acid, omethoate, malathion. Finally, the prepared electrode was extracted with ethanol solution, and then washed with deionized water. This process is repeated three to five times. Electrodes are thus obtained: Phenolimp-ZnO, PHBA imp-ZnO, BPA imp-ZnO, 2,4-DHBA imp-ZnO, Ome imp-ZnO and Mal imp-ZnO, which are the products.

[0035] Electrode surface morphology was characterized by field emission scanning electron microscopy (SEM), see figure 1 , it can be seen...

Embodiment 3

[0040] The prepared Phenol imp-ZnO, PHBA imp-ZnO electrode and non-imprinted ZnO electrode were used to compare the photocatalytic degradation of phenol and p-hydroxybenzoic acid. The photocatalytic degradation experiment was carried out in a 100mL single-cell circular quartz electrolytic cell, plus a cup set with a circulating water system. The electrolytic cell is cooled with circulating water to keep the temperature of the reaction system at 25°C. Phenol imp-ZnO, PHBAimp-ZnO and ZnO electrodes are used as photocatalytic anodes, and platinum sheets are used as cathodes. The cathode and anode are placed in parallel in the reactor, and the distance between the electrodes is 1.0 cm. The geometric area of ​​cathode and anode is 3.5cm 2 . The applied cell voltage was +0.6V. The light source is an ultraviolet lamp with a power of 200W. The concentration of target pollutant phenol and p-hydroxybenzoic acid solution is 50mg L -1 , the supporting electrolyte is 0.1mol L -1 Na ...

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Abstract

The invention relates to a preparation method of one-dimensional single-crystal rigid molecularly-imprinted ZnO electrode. By means of the seed-induced low-temperature hydrothermal method, a ZnO nanoelectrode with molecularly-imprinted recognition sites of target substances grows on an anodization-pretreated titanium plate controllably, and the nanoelectrode is applied to selective photocatalytic oxidation of corresponding target and non-target substance systems. Compared with the prior art, the method provided by the invention directly constructs recognition sites of target substances on the surface of inorganic ZnO materials; which avoids the problems that imprinting membranes constructed by traditional polymers block light and are degraded by themselves in practical applications, and ensures certain rigidity and mechanical strength of the materials; so that binding sites of target substances are highly approachable and imprints are expressed well. The preparation technology of the electrode is low in cost and simple, and has wide applications and economic and social benefits.

Description

technical field [0001] The invention belongs to the field of material chemistry, and in particular relates to a preparation method of a one-dimensional single crystal rigid molecular imprinted ZnO electrode with high selective photocatalytic oxidation performance. Background technique [0002] Photocatalytic oxidation technology has a very broad application prospect in the field of environmental pollutant treatment. It is a hydroxyl radical reaction with strong oxidation ability. Once the pollutant is adsorbed on the surface of the catalyst, it will be oxidized and degraded. The treatment effect is fast and Efficient, but it is precisely because of this characteristic of photocatalytic reaction that it is not selective for the degradation of pollutants in the reaction system. In view of the fact that the current environmental pollutant system is increasingly characterized by a variety of types and varying degrees of toxicity, the selective photocatalytic oxidation of a speci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/06B01J37/10C02F1/32C02F1/58
Inventor 赵国华农馥俏张亚男柴守宁
Owner TONGJI UNIV