ізотерма Ленгмюра

This paper describes the adsorption of Cu²⁺ and Fe²⁺ ions, common heavy metals found in industrial wastewater, by a fly ash-based geopolymer in batch adsorption experiments. Kinetics studies showed that the adsorption of each ion followed a pseudo-second order reaction. Moreover, adsorption isotherm of Cu²⁺ and Fe²⁺ ions followed the Langmuir model. Monolayer adsorption capacities were approximately 53.76 mg/g for Cu²⁺ ion and 52.63 mg/g for Fe²⁺ ion, respectively.

In this paper activated carbon is prepared from coconut leaves by chemical activation during slow pyrolysis at 673 K in an inert atmosphere. Activated carbon is prepared in the stiochiometric ratio of 1:1 (CL₁), 2:1 (CL₂) and 3:1 (CL₃). Optimized 3:1 ratio is preferable for further study. BET surface area of CL₃ activated carbon was found 1060.57 m²/g. It is greater than those of CL₁ and CL₂.