Preparation method and application of corn stalk core regenerated cellulose immobilized nano-CuS/TiO2 composite aerogel

Abstract

The invention discloses a preparation method of corn stalk core regenerated cellulose immobilized nano-CuS / TiO2 composite aerogel. The preparation method comprises the following steps: shearing air-dried corn stalks for later use, carrying out cellulose extraction on a medullary core by using a malonic acid / hydrogen peroxide method, and dissolving the freeze-dried cellulose in a DMAc / LiCl system;dropwise adding an aqueous CuCl2 and Na2S solution into a TiO2 suspension, reacting, centrifuging, cleaning and drying to obtain CuS / TiO2 particle powder; and dispersing the CuS / TiO2 particle powder into DMAc, then adding the obtained dispersion into a glycerin-containing cellulose dissolved solution, uniformly mixing, dropwise adding blended cellulose into a template, regenerating in water, washing and freeze-drying to obtain the CuS / TiO2 loaded regenerated cellulose composite aerogel. The composite aerogel prepared by the method has the advantages of light weight, rich pore channels, reproducibility, wide photocatalytic response interval, high efficiency of catalytically degrading dye organic matters and the like, and has a good application prospect in the aspect of industrial dye wastewater degradation.

Description

technical field [0001] The invention relates to a method of using agricultural solid waste --- corn stalks to prepare loaded CuS / TiO 2 The invention relates to regenerated cellulose airgel of nanoparticles, which is a process technology for catalytically degrading organic dyes, and belongs to the technical field of natural polymer modified materials. Background technique [0002] At present, the problem of industrial dye wastewater is very serious. With the rapid development of China's economy, the discharge of organic wastewater from various industries is increasing year by year. Most of the wastewater is highly toxic. If it is discharged directly without treatment, it will affect the surface and groundwater to varying degrees, resulting in The death of animals and plants even threatens human health. At present, the main organic wastewater treatment methods include biochemical methods, physical adsorption methods and chemical catalytic methods. Because most of the dye mol...

AI Technical Summary

Problems solved by technology

It is a pity that titanium dioxide still has the following defects: ① the band gap is wide (3.2eV), the corresponding absorption spectrum is 387mm, it can only absorb ultraviolet light, there is no response in the visible light range, and the utilization rate of sunlight is low (about 4% ); ②The recombination rate of photogenerated carriers is high, resulting in low photocatalytic efficiency, which restricts the wide application of this technology

Corn stalks are one of the three major straw resources in my country. Due to the constraints of their own characteristics and transformation technology, they have not been used with high added value. Now they are mainly used as livestock feed or even incinerated, and there are very few industrial applications.