Preparation method and use method of high-performance Cr (VI)-removing coal-based functional material

Abstract

The invention discloses a preparation method and a use method of a high-performance Cr (VI)-removing coal-based functional material. The material is suitable for Cr (VI)-containing sewage treatment. The preparation method comprises the following steps: firstly, mixing raw materials and persulfate, then adding pure water into the mixture of the raw materials and the persulfate, fully stirring and mixing, then carrying out hydrothermal carbonization reaction on the mixed material, naturally cooling to room temperature after the reaction is finished, carrying out suction filtration on the cooled material, removing sulfate ions in the material by using ultrapure water, and finally, drying and grinding the material without the sulfate ions to obtain the high-performance Cr (VI)-removing coal-based functional material. When in use, the high-performance Cr (VI)-removing coal-based functional material is put into Cr (VI)-containing sewage to be stirred. The method has the advantages of cheap and easily available raw materials, simple reaction conditions, wide application range and high reaction speed.

Description

technical field [0001] The present invention relates to a preparation method and use method of a Cr(VI)-removing coal-based functional material, especially a preparation method and use of a high-performance Cr(VI)-removing coal-based functional material suitable for Cr(VI)-containing sewage treatment method. Background technique [0002] In recent years, with the rapid development of industry, the problem of heavy metal pollution caused by industrial wastewater has become increasingly serious. Electroplating, metal processing, textile processing, leather processing, etc., lead to the emergence of a large amount of Cr(VI)-containing wastewater. Cr(VI) has a relatively high refractory, high toxicity and high carcinogenicity in water bodies, and accumulates in water bodies To a certain limit, it will cause long-term and irreversible damage to aquatic animals and plants, and can enter the human body through the food chain to affect human health. Therefore, the removal of Cr(VI)...

AI Technical Summary

Problems solved by technology

However, due to the structural characteristics of lignite itself, its adsorption capacity for Cr(VI) is limited. In order to improve its adsorption performance for Cr(VI), a large amount of nitric acid or concentrated sulfuric acid is added to modify lignite through nitration or sulfonation. And lignite and humic acid to remove Cr (VI) reaction conditions are relatively harsh, there must be enough H in the solution + , which requires a strong acid environment, which greatly limits the scope of application of the reaction

[0004] As a by-product of the coking process of low-value-added coking enterprises, coke powder has a very low utilization rate, and a large amount of open-air accumulation produces serious pollution, which seriously affects the quality of life of surrounding residents.