RESUMEN
The synthesis of a novel composite adsorbent prepared from coir pith activated carbon (CPAC), chitosan and sodium dodecyl sulphate (SDS, an anionic surfactant) is reported. The characterisation of the composite was done using SEM, XRD, UV-visible and IR spectroscopy studies. The effectiveness of the composite was made for the removal of a toxic cationic dye, malachite green (MG) from waste water based on adsorption studies. The reaction conditions for the adsorption studies were optimized based on initial dye concentration, dose rate, reaction time, pH and temperature. Langmuir and Freundlich isotherm models were adopted to study the mechanism of adsorption. The adsorption process was found to follow pseudo second order kinetics. The results of the present study indicate that the CPAC based composite could be an effective low cost adsorbent for the removal of MG from waste water.
Asunto(s)
Quitosano/química , Colorantes de Rosanilina/química , Colorantes de Rosanilina/aislamiento & purificación , Contaminantes Químicos del Agua/química , Contaminantes Químicos del Agua/aislamiento & purificación , Purificación del Agua/métodos , Agua/química , Adsorción , Concentración de Iones de Hidrógeno , Cinética , Dodecil Sulfato de Sodio/química , Soluciones , Propiedades de Superficie , Termodinámica , Factores de Tiempo , Aguas Residuales/químicaRESUMEN
A composite of Typha latifolia activated carbon (TLAC) (a novel, low cost absorbent) and chitosan (TLAC/Chitosan composite) was prepared. The composite was characterised using IR spectra, XRD, FESEM and Pore size studies. Its effectivity was tested for the removal of crystal violet dye from aqueous solutions. The effect of pH, dose rate and initial dye concentration was evaluated. The adsorption isotherm, kinetics and thermodynamic parameters were studied. Langmuir and Freundlich isotherm models were found fit effectively for the dye adsorption data in the present study. The adsorption followed pseudo-second order kinetics. The evaluated thermodynamic parameters show a spontaneous and exothermic reaction. Overall, this study indicates TLAC/Chitosan composite as an effective adsorbent for the removal of crystal violet dye from aqueous solutions.