Thermodynamics and kinetics of adsorption of Cu(II) onto waste iron oxide

• Published in: Journal of hazardous materials Vol. 144; no. 1; pp. 406 - 411
• Main Authors: Huang, Yao-Hui, Hsueh, Chan-Li, Cheng, Hui-Pin, Su, Liang-Chih, Chen, Chuh-Yung
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.06.2007; Elsevier
• Subjects: Adsorption; Applied sciences; Chemical engineering; Conservation of Natural Resources; Copper; Copper - chemistry; Exact sciences and technology; Ferric Compounds - chemistry; General purification processes; Industrial Waste; Iron oxide; Kinetics; Pollution; Reactors; Thermodynamic; Thermodynamics; Waste Disposal, Fluid - methods; Wastewaters; Water Pollutants, Chemical - chemistry; Water Purification - methods; Water treatment and pollution; Iron oxide; Kinetics; Adsorption; Copper; Thermodynamic; Fluidized bed reactor; Scanning electron microscopy; Second order; Reaction product; Adsorption capacity; Modeling; Powder; Waste water; Heavy metal; pH; Fenton reaction; Oxidation; Aqueous solution; Sorbent
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2006.10.061

This study investigates low-cost sorbents as replacements for current costly methods of removing heavy metals from solution. This investigation explores the waste iron oxide material (F1), which is a by-product of the fluidized-bed reactor (FBR)–Fenton reaction, for use in the treatment of the wastewater in Taiwan. X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the F1. In this investigation, F1 are tested as adsorbents for removing copper (Cu 2+) from aqueous solutions. The highest Cu 2+ adsorption capacity of F1 adsorbent was determined as 0.21 mmol g −1 for 0.8 mmol dm −3 initial Cu 2+ concentration at pH 6.0 and 300 K. Adsorption data were well described by the Freundlich model and the thermodynamic constants of the adsorption process, Δ G°, Δ H° and Δ S° were evaluated as −6.12 kJ mol −1 (at 318 K), 9.2 kJ mol −1 and 48.19 J mol −1 K −1 (at 318 K), respectively. Additionally, a pseudo-second-order rate model was adopted to describe the kinetics of adsorption.