Synthesis and separation property of flower-like Cd(OH)_2 microstructures via a simple solution route

摘要

Well-defined flower-like Cd(OH)_2 microstructures have been successfully synthesized via a simple aqueous solution route, using CdCl_2 and NaOH as the reactants, and triethanolamine (TEA) as the modifying agent. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and UV-vis spectrometer were used to characterize the products. SEM and TEM images illustrated that the flower-like Cd(OH)_2 bundles consisted of hexagonal nanoplates with thickness of about 50 nm. The adsorption of TEA on (001) plane of the growing Cd(OH)_2 crystal leads to the flower petals in appearance. Further experiments evidenced that the positively charged Cd(OH)_2 could effectively adsorb or separate the negatively charged dye molecules.