Poly-ionic-liquid-modified cerium-doped nano zinc oxide photocatalyst and preparation method and application thereof

Abstract

The invention relates to a poly-ionic-liquid-modified cerium-doped nano zinc oxide photocatalyst and a preparation method and application thereof. The preparation method comprises the steps of adopting zinc nitrate hexahydrate, hexamethylamine, sodium citrate dihydrate and cerium nitrate hexahydrate as raw materials; adopting 1-butyl sulfonate-3-vinyl imidazole bisulfate as poly-ionic liquid, using the poly-ionic liquid for preparing a mixture water solution, stirring the mixture at a constant temperature for a reaction, and then making the mixture subjected to centrifugation, washing, drying,roasting and grinding to obtain poly-ionic-liquid-modified cerium-doped nano zinc oxide powder. The poly-ionic-liquid-modified cerium-doped nano zinc oxide powder has more excellent photocatalytic activity during degrading of an organic dye under illumination of visible light in comparison with pure zinc oxide, and has the advantages of small particle size, high dispersity and stability and the like. A preparation technology is simple, raw materials are easily obtained, the preparation process is clean and free of pollution, and a prepared product has a broad application prospect in the aspect of organic dye wastewater disposal.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis and nanometer material preparation, and in particular relates to a polyionic liquid modified cerium-doped nano-zinc oxide photocatalyst and a preparation method and application thereof. Background technique [0002] Photocatalytic degradation of organic pollutants is an environmentally promising technology that utilizes renewable, non-polluting sunlight to degrade toxic and hazardous substances. Photocatalytic technology uses light to excite semiconductors to generate electron-hole pairs with redox activity, thereby inducing a series of decomposition reactions of organic pollutants and finally generating non-toxic H 2 O and CO 2 . Compared with traditional organic pollutant treatment methods, photocatalytic technology has no secondary pollution, low reaction energy consumption, and can also realize the recycling of heavy metals, transforming heavy metals in sewage into low-toxic or non-to...

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Problems solved by technology

The precipitation method is easy to operate and low in cost, but the prepared particles are easy to agglomerate; the sol-gel method needs to add a gelling agent, this method is simple to operate, the required reaction temperature is low, and the product purity is high, but the cost is high and the reaction time is long ; The hydrothermal method can regulate the shape of the crystal grains by changing the reaction conditions, but it needs to be carried out under high pressure, which requires high requirements for experimental equipment; the microemulsion method needs to add surfactants and additives, and the prepared samples are uniform in size and dispersed. Good performance, but there are many influencing factors in the reaction process, the reaction cost is high, and the obtained particles are easy to agglomerate

Pure nano-zinc oxide is limited in practical applications due to its wide band gap, narrow photoresponse range, and easy recombination of photogenerated carriers.

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