Flower-like structured CuS material as well as preparation method and application thereof

Abstract

The invention relates to a flower-like structured CuS material as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a cupric compound and a solvent, and sufficiently stirring the components at certain temperature so as to obtain a homogeneous solution; under acute stirring, slowly adding a sulfur-containing compound into the homogeneous solution, and performing temperature-keeping treatment; transferring the solution into a hydrothermal reaction kettle, and performing a sealed heating reaction at certain temperature, performing cooling till the room temperature, performing filtration and collection, washing the product, performing filtration again, performing vacuum drying, and grinding the product, thereby obtaining a black product, that is, the flower-like structured CuS material. The flower-like structured CuS material can be applied to photocatalytic degradation dye wastewater. Compared with the prior art, the flower-like structured CuS material is wide in visible light response range of CuS, and high in visible light utilization rate.

Description

technical field [0001] The invention relates to the scientific field of nanometer materials, in particular to a CuS material with a flower-like structure and its preparation method and application. Background technique [0002] Dye wastewater has the characteristics of deep color, many types of organic matter, high COD and BOD values, high biological toxicity and refractory degradation. Therefore, dye wastewater has become a difficult problem in the textile printing and dyeing industry today. If printing and dyeing wastewater is not treated or discharged directly after primary treatment, it will seriously harm the organisms, soil and water bodies in the polluted area, and cause great damage to the ecological environment. Studies have shown that when the concentration of certain dyes in the water body reaches only 1 μg / L, the dissolved oxygen and transparency of the water body will be reduced, which will directly lead to the death of aquatic animals and plants. In addition, ...

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Problems solved by technology

However, due to the relatively long preparation time and difficult operation of the biological method, it is usually not used alone in the actual wastewater treatment, and it needs to be combined with other technologies to effectively avoid the shortcomings of the biological method in wastewater treatment.

Physical methods include adsorption method, coagulation method, membrane separation method, etc. This method is more effective, but there are problems such as high treatment cost and a large amount of difficult-to-handle sludge. For example, activated carbon is a commonly used physical adsorbent at present, but activated carbon adsorbent There are obvious deficiencies: (1) low selectivity and small scope of application; (2) high production cost due to tight supply chain; (3) less activated carbon regeneration equipment and difficult regeneration

Nano TiO 2 Due to its environmental friendliness, good chemical stability and high photocatalytic activity, it has become one of the most widely studied photocatalysts, but because of its forbidden bandwidth, it can only respond to ultraviolet light with a wavelength less than 387nm. Less than 5%, which greatly limits its application range

However, the CCN-CuS photocatalytic material prepared by this patent has a band gap of only 2.45eV, and a BET specific surface area of ​​only 6.8m 2 / g

On the one hand, the bandgap width of 2.45eV limits the photoresponse range and reduces the utilization of sunlight; on the other hand, the specific surface area of ​​6.8m 2 / g reduces the adsorption of materials to dyes, etc.

This leads to the low degradation efficiency of CCN-CuS photocatalysts for dyes and other organic substances under visible light, which limits its application range in the field of visible light photocatalytic degradation of organic substances such as dyes.

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