The Quantitative Theoretical Research On Phenol Adsorbed By Shell Activated Carbon In Solution

Adsorption is widely used in treating waste water at home and abroad, the obvious advantages of adsorption is that has simple equipment and technology, adaptive concentration range and will not cause secondary pollution. In the practice of treating waste water with adsorption, the accurate quantitative calculation of adsorbent and adsorbate is a long-standing problem that did not get settled. Four components adsorption model were established based on a series of solid/liquid ion adsorption system, which provided the quantitative relationships between adsorbed amount and the concentration of adsorbent and adsorbate, however it was only testified in ion adsorption system.This paper selected shell activated carbon as adsorbent, the initial concentration of phenol was 50-1000mg/L and the concentration of adsorbent was 5-25g/L, the equilibrium adsorption isotherm and dynamics process of this adsorption system was researched, the effectiveness and adaptive conditions of four components adsorption model in this system was also discussed. The main results are as follows:(1) Shell activated carbon produced from agricultural and sideline products is cheap and green, which could remove phenol from waste water by adsorption efficiently and quickly. So shell activated carbon is a kind of water-purifying material. Effect of temperature on phenol adsorption by shell activated carbon was not significant. The adsorption decreased with increasing temperature in 10-40℃. Effect of initial pH of solution on phenol adsorption was significant. It was good for improvementof removal ratio to make sure the pH of phenol waste water in acid and in neutral solution.(2) There was adsorbent effect in the adsorption system of shell activated carbon and phenol waste water. The parameters of classical Langmuir and Freundlich isotherm equation were not constant, but varied constantly with the changes of adsorbate concentration Co and adsorbent concentration Wo. Matching parameters obtained by given WO or Co would lead to wrong conclusions when they were used to compare adsorption performance of different adsorbent or thermodynamics estimate. (3) Patterns of phenol adsorption by shell activated carbon correspond with four components adsorption model. Equilibrium adsorption of phenol and removal rate were up to the relative level of adsorbate concentration Co and adsorbent concentration W0 Equilibrium adsorption represented a unique value that corresponded to a given ratio of Co and W0. Equilibrium adsorption predicting equation derived from four components adsorption model could forecast the phenol adsorption in the condition of given ratio of Co and Wo, indicating four components adsorption model putted forward by predecessors on the basis of series solid and liquid phase ion adsorption research was the same applies to molecule adsorption systems.(4) The Lagergren quasi secondary dynamic equation can well fitted kinetics ion adsorption process in aqueous solution for adsorption of phenol on shell activated carbon, but its parameters can't ascertain the function relation between them with Co and Wo changing. Dynamic equation obtained based on four adsorption components theory model has high identical degree with the experimental data and parameters Co and W0 remain nearly constant in the tested range, indicating that given Co and W0, the presented equation can be used to describe the kinetic molecular adsorption process for phenol adsorptions on shell activated carbon in solutions.The results proved that there were problem of adsorbent effect,parameters variation in the use of classical adsorption theory, and four components adsorption model could eliminate adsorbent effect effectively, which effectively solve the problem of accuracy in the quantitative calculation of solid and liquid phase ion adsorption, and provided basis for quantitative research of treatment of phenol wastewater by adsorbent.