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Dried Biomass of Activated Sludge for Cu2+ Adsorption: Behaviors and Mechanisms
Authors:Meipeng Jian  Ming Liu
Affiliation:School of Civil Engineering and Architecture , East China JiaoTong University , Nanchang , Jiangxi , P. R. China
Abstract:Activated sludge was tested for its ability to remove Cu2+ from aqueous solution. The effects of various experimental parameters (initial pH, initial Cu2+ concentration, adsorbent dosage, and temperature) on Cu2+ adsorption were evaluated. The Langmuir isotherm model well described the adsorption of Cu2+ onto activated sludge. The pseudo-second-order kinetic equation was appropriate for describing the kinetic performance of the sorption. Furthermore, Webber–Morris models indicated that the sorption of Cu2+ was generally found to involve with the intraparticle diffusion process. Parameters of adsorption thermodynamic suggested that the interaction of Cu2+ adsorbed by sludge was spontaneous and exothermic. Activated sludge was characterized by Fourier transform infrared spectroscopy analysis and results showed that active groups such as –OH, –COOH, –NH2 were involved in Cu2+ adsorption. Zeta potential analysis demonstrated inner-sphere adsorption for Cu2+ adsorption on sludge. id=
Keywords:Activated sludge  adsorption  mechanisms  zeta potential
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