Adsorption at adsorption equilibrium was achieved after 3h, the adsorption capacityremained at 300 mg/kg above, grapefruit peel activated carbon adsorption of phosphate follows thequasi-second order kinetic model; Freundlich R'correlation coefficients were significant, therefore,grapefruit peel activated carbon adsorption of phosphorus found Freundlich isotherm model;initialconcentration, dosyrdcarbon
age, pH and adsorption temperature on adsorption of phosphorus are affected, pH onthe adsorption of non- large.wholesale powdered activated carbon
(4) Adsorption at adsorption equilibrium was achieved after 14h, the adsorption capacityremained at 21.5 mg / g above. Grapefruit peei activated carbon Cr () in the adsorption processfollowed pseudo second order kinetic model; by the Langmuir equation and Freundlich equation of thecorrelation coefficient R' known,consistent with Langmuir isotherm model and the Freundlichisotherm model.Using Langmuir isotherm model to analyze the experimental data obtained in thesolution pH 4, the maximum adsorption capacity was 26.25mg / g;Freundlich isotherm model usingIn painting, printing, shoe making, plastic, rubber, bonding and other industrial processes, there are a large number of organic waste gas emissions.These waste gas, often contain benzene, toluene, xylene, ethyl acetate, methanol and other organic matter, itself toxic, long-term damage can lead to human death.The emission of this kind of waste gas, countries have clear provisions, strict control of its emission concentrationThe treatment of organic waste gas has been studied for a long time, and some effective control technologies have been developed.The widely used and studied control techniques include adsorption method, thermal destruction method, condensation method, absorption method, etc.
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.
In 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