Activated carbon (AC) is a kind of porous carbon material with developed pore structure and large specific surface area, which is prepared by using biological organic matter (such as wood, coke, petroleum coke, coal and various nut shells, etc.). It is a kind of high quality adsorbent.
With the development of industry, its application is more and more extensive.
At present, it has been widely used in the field of environmental protection, food industry and medicine.
Industry, agriculture and many other fields.
In recent years, one of the research hotspots of activated carbon is to use cheap agricultural and forestry wastes as raw materials and simple and clean process to prepare biomass activated carbon with high economic benefit and good adsorption performance.
If the agricultural and forestry wastes are effectively utilized and turned into treasures, it can not only create certain economic benefits, but also reduce its pollution to the environment, and achieve the purpose of treating waste with waste.
In this paper, using biomass (corn cob, rice husk and peanut shell) as raw material, the experimental research on the preparation of activated carbon from biomass was carried out on the self-built experimental platform, and the activation temperature, activation time, impregnation ratio and impregnation time and other activation and physicochemical characteristics were systematically studied.
Activated carbons with different specific surface area and pore structure were prepared by physical activation and chemical activation, changing carbonization and activation conditions.
The pore structure of activated carbon was analyzed by ASAP2020M aperture analyzer.coconut shell activated carbon manufacturers
The surface structure characteristics of activated carbon and the pyrolysis process of biomass under different conditions were studied. The adsorption performance and yield of activated carbon prepared by two methods were discussed and compared.
The results show that activation condition and impregnation condition are the most important factors.
The optimum specific surface area of activated carbon prepared by physical activation method is 924.48m'/g, and the yield is 26.18%.
The optimum specific surface area of activated carbon prepared by chemical activation method is 1200.04 m2g, and the yield is 34%.www.chinactivecarbon.com
Although the specific surface area and yield of the chemical activation method are the largest, it can be seen that the activated carbon prepared by the physical activation method has higher economic benefit and environmental protection value considering the economic benefit and environmental protection value of the preparation process comprehensively.
Finally, based on the preparation of activated carbon from biomass, the adsorption equilibrium and kinetics of the prepared activated carbon for methylene blue and the adsorption characteristics of mercury in flue gas were studied.
The theoretical basis for its application in printing and dyeing wastewater treatment and mercury removal from flue gas is given.
In the experiment of adsorption equilibrium and kinetics of methylene blue on activated carbon, the experimental results show that the Freundlich adsorption isotherm model is more accurate to describe the adsorption phase equilibrium of methylene blue on activated carbon.
The Freundlich adsorption isotherm of methylene blue adsorption by activated carbon was expressed as: logQE =log59.293+ 0.42logc.
The kinetic data are consistent with the quasi-second-order kinetic model, which can more accurately describe the adsorption process of methylene blue on activated carbon.
The prepared activated carbon can effectively adsorb and remove methylene blue solution in different concentration range in aqueous solution, and the removal effect is better, which is a kind of adsorbent with development potential.
In activated carbon adsorption characteristics of mercury in flue gas of experiments, the experimental results show that: the preparation of activated carbon and commercial activated carbon has the same ability to mercury, commercial activated carbon on mercury adsorption efficiency was 53.5%, the biggest physical activation, the preparation of activated carbon on mercury adsorption efficiency was 47.5%, the largest chemical activation of the activated carbon prepared by the biggest adsorption efficiency for the mercury is 57.64%.
According to the above experimental results, biomass is an ideal raw material for the preparation of activated carbon, and the prepared activated carbon is an adsorbent with development potential.
By comprehensive comparison between physical activation method and chemical activation method, the activated carbon prepared by physical activation method has better economic benefit and environmental protection value.