Adsorption mechanism of bacterial cellulose to heavy metal ions
To examine the possibility of metal adsorption by bacterial cellulose ( BC ) , the adsorption kinetics characteristics and adsorption isotherm to Cu2+ ,Pb2+ and Cd2+ were studied. FT-IR was applied to investigate the adsorption mechanism of metal ions by BC. The results show that adsorption process can be described by Langmuir model and second-order reaction kinetics. It indicates that the adsorption of BC obeys the formation of monolayer molecule sorption with the main action of chemical adsorption. Because the constants C obtained with a particles internal diffusion model is not zero, particles internal diffusion is not the only one controlling rate step. The FT-IR analysis shows that the maximum wavenumber of —OH on BC after adsorbed is shifted to blue range due to reducing the number of —OH.
bacterial celluloseheavy metal ionsadsorptionmechanism
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维普
