Nano zno/c composite photocatalyst and preparation method thereof

A technology of composite light and catalyst, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the limited application, reduced catalytic activity of ZnO, poor visible light responsiveness, etc. To achieve the effect of enhancing adsorption, improving specific surface area and crystallinity, and improving photocatalytic efficiency

Active Publication Date: 2017-08-11
陕西乾微明光科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, since ZnO is an amphoteric substance, it is easily soluble in strong acid and strong alkali; and after being excited by light, the generated electron-hole pairs are easy to recombine, and the response to visible light is poor, which reduces the catalytic activity of ZnO, which limits its practical application. application in

Method used

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  • Nano zno/c composite photocatalyst and preparation method thereof
  • Nano zno/c composite photocatalyst and preparation method thereof
  • Nano zno/c composite photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1: Preparation of fireworks-like nano-ZnO:

[0038] Put zinc acetate dihydrate in a ceramic crucible, the ratio of the volume of zinc acetate dihydrate to the total volume of the crucible is 2:60, cover the crucible lid, and then place it in the cavity of a box-type resistance furnace, and heat it from room temperature to 300°C Afterwards, calcining for 3 hours, gradually lowering to room temperature, that is, generating fireworks-like nano-ZnO on the crucible wall;

[0039] Step 2: surface amination of nano-ZnO:

[0040] Weigh 0.1g of fireworks-like nano-ZnO in step 1, add it to 35mL of absolute ethanol, add dropwise 2.5g of silane coupling agent, ultrasonically disperse, then transfer to a 100mL three-neck flask, reflux at 80°C for 8h, centrifuge, and use Repeated washing with ethanol to obtain aminated nano-ZnO;

[0041] Step 3: Preparation of ZnO / C composite photocatalyst:

[0042] Weigh 0.05 g of aminated nano-ZnO and 0.05 g of glucose, dissolve them in eth...

Embodiment 2

[0045] Step 1: Preparation of fireworks-like nano-ZnO:

[0046] Put zinc acetate dihydrate in a ceramic crucible, the ratio of the volume of zinc acetate dihydrate to the total volume of the crucible is 2.5:60, cover the crucible lid, and then place it in the cavity of a box-type resistance furnace, and heat it from room temperature to 300°C Afterwards, calcining for 2 hours, gradually lowering to room temperature, that is, generating fireworks-like nano-ZnO on the crucible wall;

[0047] Step 2: surface amination of nano-ZnO:

[0048]Weigh 0.2g of fireworks-like nano-ZnO in step 1, add it to 30mL of absolute ethanol, add dropwise 2.7g of silane coupling agent, ultrasonically disperse, then transfer to a 100mL three-neck flask, reflux at 80°C for 7.5h, and centrifuge. And repeatedly washed with ethanol to obtain aminated nano-ZnO;

[0049] Step 3: Preparation of ZnO / C composite photocatalyst:

[0050] Weigh 0.05 g of aminated nano-ZnO and 0.1 g of glucose, dissolve them in ...

Embodiment 3

[0053] Step 1: Preparation of fireworks-like nano-ZnO:

[0054] Put zinc acetate dihydrate in a ceramic crucible, the ratio of the volume of zinc acetate dihydrate to the total volume of the crucible is 3:60, cover the crucible lid, and then place it in the cavity of a box-type resistance furnace, and heat it from room temperature to 300 °C Afterwards, calcining for 1 h, gradually lowering to room temperature, that is, generating fireworks-like nano-ZnO on the crucible wall;

[0055] Step 2: surface amination of nano-ZnO:

[0056] Weigh 0.3g of fireworks-like nano-ZnO in step 1, add it to 25mL of absolute ethanol, add 3g of silane coupling agent dropwise, ultrasonically disperse, then transfer to a 100mL three-necked flask, condense and reflux at 80°C for 7h, centrifuge, and wash with ethanol Repeated washing to obtain aminated nano-ZnO;

[0057] Step 3: Preparation of ZnO / C composite photocatalyst:

[0058] Weigh 0.05 g of aminated nano-ZnO and 0.2 g of glucose, dissolve t...

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Abstract

The invention relates to a nano-ZnO / C composite photocatalyst and a preparation method thereof. ZnO is easily soluble in strong acid and strong base, and its catalytic activity decreases after being excited by light, which limits its practical application. The invention utilizes zinc acetate dihydrate to generate firework-like nano-ZnO in a crucible, adds it to absolute ethanol, drips a silane coupling agent for ultrasonic dispersion, condenses and refluxes for centrifugal separation, washes to obtain aminated nano-ZnO, and dissolves glucose and ethanol in ethanol. , after ultrasonic dispersion, water bath reaction, transfer to polytetrafluoroethylene hydrothermal reaction kettle, microwave-assisted hydrothermal reaction, centrifugal collection and washing, to obtain nano-ZnO / C composite photocatalyst. The method of the invention has the characteristics of easy availability of raw materials, simple process, environmental protection and no pollution, etc. The prepared nano-ZnO / C composite photocatalyst has good dispersibility and large specific surface area, and the thickness of the carbon layer is controlled by adjusting the reaction conditions, Thereby, the photocatalytic efficiency of the composite photocatalyst can be effectively improved.

Description

technical field [0001] The invention relates to a photocatalyst, in particular to a nano ZnO / C composite photocatalyst and a preparation method thereof. Background technique [0002] In recent years, with the development of economy and industry and the continuous growth of population, energy crisis and environmental pollution have become the two major themes in the field of science and technology today, especially environmental pollution is becoming more and more serious, especially water pollution, which has aroused people's high Pay attention to. Photocatalytic technology is widely used in the treatment of biodegradable organic wastewater and comprehensive wastewater due to its advantages of high catalytic activity, low energy consumption, strong oxidation ability and no secondary pollution. Among many semiconductor photocatalysts, ZnO has a large band gap (Eg=3.37eV) and high electron excitation binding energy (60meV), and the preparation method of ZnO is usually simple,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/06B01J35/10
Inventor 刘俊莉赵燕茹马建中苏宇宁
Owner 陕西乾微明光科技有限公司
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