Removal of some organic dyes from aqueous solution by peanut husk.

Adsorption is one of the most promising decolorization techniques in dyeing waste water treatment. Adsorption is a useful and simple technique, which allows kinetic and equilibrium measurements without any highly sophisticated instruments. The main advantage of adsorption recently became the use of low-cost materials, which reduces the procedure cost. Peanut husk (PH) was developed for the removal of acid violet 19 (AV19) and basic red 2 (BR2) in single and binary systems from aqueous solutions. The variation of pH, dose of adsorbent, initial concentration of dyes and temperature were investigated where the removal percent of dyes increase with increasing dose and temperature and decrease with increasing concentration. SEM and IR were used to analyze the morphology and chemical groups of the (PH) and (TPH) before and after dye sorption and also the point of zero charge of adsorbent was investigated. Langmuir and Freundlich isotherm models were used to investigate the adsorption process. It was found that the Langmuir model best described the experimental data. Also the kinetic obtained data were analyzed using pseudo first order, pseudo second order, intraparticle where the experimental results fit well with the pseudo- second- order model. And thermodynamics properties of the process were investigated where adsorption of dyes onto peanut husk (PH) was found to be spontaneous and endothermic in nature.