title: Adsorption studies on Parthenium hysterophorous weed: removal and recovery of Cd(II) from wastewater.
abstract: The efficiency of parthenium weed as an adsorbent for removing Cd(II) from water has been studied. Parthenium is found to exhibit substantial adsorption capacity over a wide range of initial Cd(II) ions concentration. Effect of time, temperature, pH and concentration on the adsorption of Cd(II) was investigated by batch process. Pseudo-first-order and Pseudo-second-order models were evaluated. The kinetics data for the adsorption process obeyed second-order rate equation. The equilibrium data could be described well by the Langmuir and Freundlich isotherms. Thermodynamic parameters such as DeltaH degrees , DeltaS degrees and DeltaG degrees were calculated. The adsorption process was found to be endothermic and spontaneous. The maximum adsorption of Cd(II) ions (99.7%) in the pH range 3-4 indicated that material could be effectively utilized for the removal of Cd(II) ions from wastewater. The desorption studies showed 82% recovery of Cd(II) when 0.1 M HCl solution was used as effluent.
authors.affiliation: Environmental Research Laboratory, Department of Applied Chemistry, Faculty of Engineering and Technology, Aligarh Muslim University, Aligarh 202002, UP, India.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Ajmal
authors.forename: Rifaqat Ali Khan
authors.initials: RA
authors.lastname: Rao
authors.forename: Rais
authors.initials: R
authors.lastname: Ahmad
authors.forename: Moonis Ali
authors.initials: MA
authors.lastname: Khan
mesh_terms: D000327:Adsorption; D019659:Asteraceae / Q000737:chemistry*; D002104:Cadmium / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D013696:Temperature; D013816:Thermodynamics; D013997:Time Factors; D014877:Water Pollution, Chemical; D018508:Water Purification / Q000379:methods*
chemical_list: D002104:Cadmium