Activated carbon-molecular sieve prepared from cow dung and coal fly ash, and preparation method and application thereof

Abstract

The invention discloses an activated carbon-molecular sieve prepared from cow dung and coal fly ash and a preparation method and application of the activated carbon-molecular sieve. The activated carbon-molecular sieve prepared from the cow dung and the coal fly ash comprises two components, i.e., activated carbon and a molecular sieve; and the activated carbon-molecular sieve is microporous powder and has a particle size of 100-180 microns and a specific surface area of 400-600 m<2> / g. The activated carbon-molecular sieve prepared from the cow dung and the coal fly ash can be used for adsorbing heavy metal ions in wastewater. The cow dung and the coal fly ash are jointly used as raw materials for preparing the activated carbon-molecular sieve, so high-value resource utilization of the cowdung and the coal fly ash is achieved, and the specific surface area of the activated carbon-molecular sieve can reach 600 m<2> / g or above, which is 2.6-5.0 times the specific surface area of an activated carbon-molecular sieve directly prepared from the coal fly ash. When the activated carbon-molecular sieve prepared from the cow dung and the coal fly ash is used for adsorbing heavy metal ions in wastewater, adsorption capacity can reach 4.5 mmol / g or above, which is 2.2-3.2 times the adsorption capacity of an activated carbon-molecular sieve prepared without the cow dung.

Description

technical field [0001] The invention relates to a method for comprehensively utilizing cow dung waste and coal fly ash. Background technique [0002] Coal fly ash is a low-value waste produced during the industrial utilization of coal, especially during the coal gasification process. Coal chemical companies produce a large amount of unusable low-value coal fly ash every year, and these coal fly ash are often buried treatment, resulting in a serious waste of resources and environmental pollution. Therefore, how to use coal fly ash is of great significance for solving the resource utilization of solid waste in coal chemical enterprises, reducing its treatment cost and environmental pollution. It is an effective method to directly prepare molecular sieve-activated carbon composites from coal fly ash. This process does not require the separation of silicon-alumina and residual carbon, and can make full use of the advantages of both, that is, the high specific surface of activat...

AI Technical Summary

Problems solved by technology

However, due to the low carbon content and extremely low volatile content of coal fly ash, the specific surface area of ​​the prepared composites is often low, which limits its further utilization and development.

Usually, the process of preparing activated carbon-molecular sieve composite materials from coal fly ash is to first mix the coal fly ash with NaOH and carry out high-temperature melting to activate the carbon and melt the silicon-alumina in the ash. After the mixture is pulverized, silicon source is added. Or the aluminum source controls the ratio of silicon to aluminum, and then aging in distilled water. The aged mixture is subjected to hydrothermal treatment, filtered and washed to neutral to obtain activated carbon-molecular sieve composite materials. Due to the low residual carbon content and volatile matter of coal fly ash , resulting in the prepared composite materials often have a lower specific surface area, which reduces the utilization value of composite materials

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