IMMERSION ENTHALPY OF ACTIVATED CARBON IN AQUEOUS SOLUTION OF 3-CHLOROPHENOL

摘要

Studies on the adsorption process of the activated carbons of phenol and the derivative compounds present in aqueous solutions have been carried out for some time and in fact still continue showing that the process presents some complexities and is dependent on the solution characteristics, such as pH, force ionic, the grade of dilution and others. In turn, these characteristics influence the adsorption mechanism of the phenolic compounds. The phenolic derivates are widely used as intermediates in the plastic synthesis, dyes, pesticides and insecticides, and their frequent presence in drinking waters and municipal and industrial waste sites represents a serious danger for the environment as well as -most alarmingly- for human health. In this work, the immersion enthalpies of the activated carbon are determined in 3-chloro phenol solutions in function of the concentration at pH of maximum adsorption, establishing a relationship between the quantities adsorbed and the enthalpic values of the solid-liquid interaction.