Polyimidazole ionic liquid modified cellulose-based adsorbent as well as preparation method and application of cellulose-based adsorbent

Abstract

The invention provides a polyimidazole ionic liquid modified cellulose-based adsorbent as well as a preparation method and an application of the cellulose-based adsorbent. The method comprises the steps as follows: step 1, preparing dialdehyde cellulose and a polyimidazole ion liquid respectively; step 2, immersing dialdehyde cellulose in water, dissolving the polyimidazole ion liquid in an HCl solution, mixing a dialdehyde cellulose water solution and the HCl solution of the polyimidazole ion liquid, controlling the pH in the range of 2.5-3.5, and performing stirring at 20-45 DEG C for 4-8 hto obtain a polyimidazole ion liquid modified cellulose crude product; step 3, washing the polyimidazole ion liquid modified cellulose crude product with ethanol and water, and drying the product to obtain the polyimidazole ionic liquid modified cellulose-based adsorbent. The adsorbent can effectively solve the problems of low adsorption capacity of cellulose in a water phase and single grafted imidazolium ionic liquid functional groups have few adsorption sites and weak adsorption functions in the prior modification art and can be used for treating dye wastewater.

Description

technical field

[0001] The invention belongs to the technical field of preparation and development of high-efficiency adsorbents, and relates to a cellulose-based adsorbent modified by polyimidazole ionic liquid and its preparation method and application. Background technique

[0002] In recent years, due to the rapid development of printing and dyeing, textile, and papermaking industries, environmental pollution has become increasingly serious, especially the discharge of wastewater containing dyes and heavy metals has increased year by year. Due to the high toxicity of printing and dyeing wastewater, which is easy to cause cancer and teratogenicity, its treatment has become an urgent problem to be solved. There are currently many methods used to treat printing and dyeing wastewater, such as electrolysis, ultrafiltration, chemical flocculation, chemical oxidation, adsorption, dialysis, and anaerobic-aerobic. Based on the advantages of high efficiency, low cost and easy ope...

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