Preparation method of coffee ground activated carbon

Abstract

The invention discloses a preparation method of coffee ground activated carbon. The preparation method comprises the steps of pretreatment, degreasing, dipping, activization, washing and the like. Firstly, vacuum pyrolysis degreasing is performed on coffee grounds to remove grease in the coffee grounds and carbonization is performed to obtain a precursor of the coffee grounds; then phosphoric acid is taken as an activating agent for dipping and ultrasound at different dipping ratios (the mass ratio of the phosphoric acid with the precursor of the coffee grounds); activating under different vacuum conditions after drying; the effect of the activation conditions of activation final temperature, vacuum degree, heating rate, activation time, the dipping ratio and the like on the performance of the coffee ground activated carbon is overall considered, the prepared coffee ground activated carbon is high in yield, and the iodine adsorption value and methylene blue adsorption value are both above the state first level activated carbon standard (the iodine adsorption value is 1000mg / g and the methylene blue adsorption value is 135mg / g); the coffee ground activated carbon can be used for adsorbing hazardous gas such as formaldehyde in a room after decoration, and is an air purification material with a very good adsorptive property; the whole carbon preparation process has the advantages that the blockage of coffee ground activated carbon pores caused by the coffee ground grease is avoided, the working state parameters are stable, green and environmental protection and non-pollution are realized, and is simple and feasible.

Description

technical field [0001] The invention relates to the technical field of recycling waste materials, in particular to a method for preparing activated carbon from coffee grounds. Background technique [0002] As the first of the three major beverages in the world, coffee is the second largest trade product after oil, and plays a pivotal role in daily life and commercial trade. According to the statistics of relevant departments, at the end of the "Eleventh Five-Year Plan", the total area of ​​coffee planting in my country will grow to more than 600,000 mu. From a global perspective, by 2014, the output of coffee was 7.3159 million tons per year. However, every 1 kg of instant coffee produced will produce 0.9 kg of coffee grounds. How to recycle coffee grounds has become a new topic in recent years. [0003] With the development of human society and the increasing awareness of environmental protection, activated carbon is widely used in industrial purification, environmental po...

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Problems solved by technology

[0003] With the development of human society and the increasing awareness of environmental protection, activated carbon is widely used in industrial purification, environmental pollution prevention and other fields. However, the lack of resources makes people choose activated carbon from factors such as activation difficulty, raw material grade, price, and supply. The raw materials have changed from the previous woody raw materials to coal, petroleum, etc., and then to relatively cheap plant straw, coconut shell, date shell, bagasse, pulp waste liquid, etc., but there is little research on the preparation of activated carbon from coffee grounds.

[0004] Activated carbon from coffee grounds can be used as an air purification material to absorb odors in the air. At present, the drug activation method has the advantages of simultaneous carbonization and activation and is widely used, but this method is not effective for coffee grounds because coffee grounds contain a lot of Grease, these greases will block the pores of the coffee grounds activated carbon and reduce the activation effect of the drug. Therefore, how to remove the grease from the coffee grounds and prepare high-performance activated carbon is the key to the current technology

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