The pore structure, high adsorption capacity and high surface activity and become a unique multi-functional adsorbent, and its cheap and easy to obtain, part of the renewable activation, at the same time it can effectively remove most of the organic matter and some inorganic substances in the waste water, waste gas,
So it is widely used in the world sewage and waste gas treatment, air purification, recovery of rare metals and solvents and other environmental protection and resource recovery and other fields.Activated carbon is divided into granular activated carbon, powder activated carbon and activated carbon fiber, but because the powder activated carbon has secondary pollution and cannot be regenerated and activated, it is limited to use GAC-granular activated carbon (granular activated carbon)85%~90% of GAC is used for water treatment and gas adsorption treatment, and its particle size is 500~ 5000U m. The pore structure of GAC is generally a tridisperse pore distribution, which has been obtained according to the International Society of Pure and Applied Chemistry(IUPAC) Classification Aperture >Large pores at 50nm, intermediate pores at 2.0~50nm and lt;Among them, the adsorption method is widely used.Compared with other methods, the adsorption method has the advantages of high removal efficiency, thorough purification, low energy consumption, mature technology, recovery and solution, easy popularization and practical, and has good environmental and economic benefits.Activated carbon is the most commonly used adsorbent because of its huge specific surface area, large adsorption capacity, easy regeneration, abundant sources and low price.Although the application of charcoal as an adsorbent, human beings have had a long time, but the study of adsorption theory, but only in the end of the last century began to make progress.
https://www.chinactivecarbon.comIn 1916, Langmuir studied the adsorption of monolayer molecules and proposed the Langmuir adsorption isotherm equation.Freundlich and Zsigmondy proposed the capillary condensation theory for gas adsorption and obtained the semi-empirical Freundlich adsorption isotherm equation.Temkin also suggested a semi-empirical isothermal equation.
Based on Gibbs equation, Toth used dimensionless function V to derive another adsorption isotherm equation for heterogeneous surfaces.Fowler and Guggenhein derived a formula of the same form from the concept of statistical mechanics.Goldmann and Polanyi proposed the adsorption space theory, which believed that the continuous decrease in the molecular density of multiple layers on the surface of the adsorbent was caused by the weakening of the adsorption molecular force
yrd coconut activated charcoal
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