Adsorption of Cu(II) onto HNO3-Modified Cedar Sawdust (Cedrus deodara): FTIR Analysis, Kinetics and Adsorption Isotherms Modeling

Hong Mei Deng; Yong Heng Cheng; Xiang Yang Chang; Jian Gong; Cui Qin Wu; Tao Liu

doi:10.4028/www.scientific.net/AMR.396-398.2388

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 396-398Adsorption of Cu(II) onto HNO3-Modified Cedar...

Adsorption of Cu(II) onto HNO₃-Modified Cedar Sawdust (Cedrus deodara): FTIR Analysis, Kinetics and Adsorption Isotherms Modeling

Abstract:

Cedar sawdust (Cedrus deodara), an agricultural by-product abundant in China, was used as an adsorbent for the removal of Cu(II) from aqueous solutions. The extent of adsorption was investigated as a function of pH, contact time, adsorbate concentration and reaction temperature. The Cu(II) removal was pH-dependent, reaching a maximum at pH 5. The adsorption process followed pseudo-second-order kinetics and equilibrium was reached at 60 min. The rate constantly increased with the increase of temperature, indicating the endothermic nature of adsorption. The equilibrium adsorption capacity of Cu(II) determined from the Langmuir equation was 64.52 mg/g at 25°C. The equilibrium data ﬁtted very well to the Freundlich isotherm model as compared to the Langmuir isotherm. The negative ΔGo values at various temperatures conﬁrm that the adsorption processes are spontaneous. Attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) analysis of cedar sawdust, before and after adsorption of Cu(II), suggested that the main mechanisms involved in the removal of Cu(II) might be the ionic exchange and complexation.