Preparation method and application of magnetic graphene oxide/chitosan adsorbent

Abstract

The invention discloses a preparation method and application of a magnetic graphene oxide / chitosan adsorbent. The method comprises the steps that graphite powder is oxidized to graphite oxide, and the graphite oxide is subjected to ultrasonic exfoliation to obtain graphene oxide; 1-15 g of ferrous salts, 1-10 g of ferric salts, 0.1-5 g of graphene oxide and 50-500 ml of distilled water are added into a beaker, ultrasonic treatment is conducted in an ultrasonic device for 1 h to 6 h, NH3.H2O is added to regulate the pH to be 7 to 12, and ultrasonic treatment is conducted for 1 h to 6 h; the obtained product is washed to be neutral through a centrifugal separation method and dried in a vacuum drying oven under the condition of 30 DEG C-100 DEG C, and then a magnetic graphene oxide composite material can be obtained; 0.5-2 g of prepared magnetic graphene oxide is weighed and then dissolved in the distilled water, and ultrasonic treatment is conducted for 1 h to 3 h; 20-100 ml of a magnetic graphene oxide solution and 10-100 ml of a CS solution are taken, mixed and then subjected to ultrasonic treatment; 50% of glutaraldehyde is added into the solution, and ultrasonic treatment is conducted continuously; a NaOH solution is prepared, the pH of the solution is regulated to be 8 to 12, and stirring is conducted for 2 h to 3 h; the obtained product is subjected to centrifugal cleaning repeatedly to make the pH of the product to be about 7, and the cleaned product is put into the vacuum drying oven for vacuum drying; the obtained product is the magnetic graphene oxide / chitosan adsorbent. By adopting the material as the adsorbent, under the action of an exterior magnetic field, rapid separation of the adsorbent from adsorbate is achieved, and the effect of removing dye such as neutral red in waste water is good.

Description

[0001] The invention relates to a preparation method and application of a magnetic graphene oxide / chitosan adsorbent, and relates to the fields of magnetic materials and environmental science and technology. Background technique [0002] Dyes are widely used in industrial production such as textiles, papermaking, printing, plastics, and leather. And these dyes discharged into water bodies will cause great harm to organisms. At present, the methods for treating dye wastewater mainly include biological method, coagulation method, oxidation method, membrane separation method and adsorption method, etc., and these methods have certain advantages and disadvantages. The adsorption method has attracted extensive attention of scientists because of its advantages such as low cost, high removal efficiency and simple operation process. The key to the adsorption method is to prepare environmentally friendly, economical and efficient adsorbents. [0003] Graphene is a two-dimensional car...

AI Technical Summary

Problems solved by technology

And these dyes discharged into the water will cause great harm to organisms

Images