Kinetics,thermodynamics and isotherm studies on the removal of chromium by typha latifolia bioremediator stem carbon

The removal of hexavalent chromium is a well-known poisonous metal and considered a priority pollutant from industrial wastewater include leather industry,electroplating,anodizing baths etc. to remove toxic chromium from waste water a low-cost abundant adsorbents was investigated. typha latifolia,a variety of broad leaf cattail type bioremediator,stem and leaves are used to prepare the activated carbon which was used as a novel adsorbent. the influence of ph,adsorbent dose and contact time,metal concentration,adsorbent nature and concentration on the selectivity and sensitivity of the removal process was investigated. the kinetics of adsorption process was studied by lagergren's pseudo-first order and pseudo-second order kinetics and the adsorption process depends on both time and concentration. the feasibility of the sorption was studied using freundlich and langmuir isotherms including linear regression methods. the mechanism of the adsorption process was evaluated with intra particle diffusion model. various thermodynamic parameters such as the standard gibbs free energy (δg°),standard entropy (δs°),and standard enthalpy (δh°) were calculated. the typha latifolia activated carbon (tlac) adsorbent material was characterized by using fourier transform infrared spectroscopy (ftir). in this study,langmuir isotherm was the most favorable method for the adsorption of chromium. the kinetic result shows that the adsorption process follows pseudo-second order kinetics,which implies that the adsorption process depends on both time and concentration. this readily available low-cost adsorbent is efficient in the uptake of cr (vi) ion in aqueous solution,thus,it could be an excellent alternative for the removal of heavy metals and organic matter from water and wastewater.