Abstract
A low cost biosorbent was synthesized based on rice straw, which showed the ability of selective adsorption on PdCl42−. Adsorption behaviors, including the effects of the initial concentration of PdCl42−, the adsorption time and the concentration of hydrochloric acid on the effect of adsorption, were explored systematically. The results showed that the saturation adsorption capacity of the sorbent on PdCl42− was 122.49mgg−1 and the equilibrium adsorption time was 60min. In addition, the adsorption obeyed the Langmuir isotherm model and pseudo-second-order kinetics model. Low hydrochloric acid concentration could promote the selectivity of adsorption and the adsorption rate went up to 92.71% when the concentration of hydrochloric acid was 0.5molL−1. Furthermore, the adsorption mechanism was investigated through the analyses of FTIR and XPS and it indicated that Pd(II) coordinated with the N of primary amine and the O of alcoholic hydroxyl except ion exchange with Cl−.
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