Sorption of Cd (Ⅱ) ion by lignocellulose biomass from leaves of camphor tree

摘要

Lignocellulose biomass (CLBA) from leaves of camphor tree was used for Cd (II) removal from aqueous solution. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) studies were conducted to characterize the surface groups and morphology of CLBA. The effects of CLBA dosage, pH, contact time and initial concentration on Cd (II) sorption were evaluated by batch experiments. Sorption kinetics were investigated by pseudo-first order, pseudo-second order and intraparticle diffusion kinetic models. Sorption equilibrium was examined by Langmuir and Freundlich isotherms. The sorption process follows pseudo-second order model and the Langmuir model. The removal rate is up to 99.12%, and the maximum sorption capacity is 10.99 mg g(-1). The sorption mechanism may be attributed to surface complexation and ion exchange. Effective desorption of Cd (II) suggests that CLBA can be reused for many times. This work indicates that camphor leaves can be an effective and low-cost biosorbent for Cd (II) removal from wastewater.