Adsorption studies on Parthenium hysterophorous weed: Removal and recovery of Cd(II) from wastewater

• Published in: Journal of hazardous materials Vol. 135; no. 1; pp. 242 - 248
• Main Authors: Ajmal, Mohammad, Rao, Rifaqat Ali Khan, Ahmad, Rais, Khan, Moonis Ali
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 31-07-2006; Elsevier
• Subjects: Adsorption; Adsorption dynamics; Adsorption kinetics; Applied sciences; Asteraceae - chemistry; Breakthrough capacity; Cadmium - chemistry; Chemical engineering; Exact sciences and technology; Freundlich isotherm; General purification processes; Hydrogen-Ion Concentration; Kinetics; Langmuir isotherm; Parthenium; Pollution; Temperature; Thermodynamics; Time Factors; Wastewaters; Water Pollution, Chemical; Water Purification - methods; Water treatment and pollution; Adsorption dynamics; Breakthrough capacity; Adsorption kinetics; Parthenium; Langmuir isotherm; Freundlich isotherm; Second order; Adsorption isotherm; Adsorption capacity; Desorption; Modeling; Waste water; Hydrochloric acid; Adsorption; Batchwise; First order; Thermodynamic parameter; pH; Kinetics
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2005.11.054

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 Δ
H°, Δ
S° and Δ
G° 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.