| 초록 |
Wastewater from industries may contain excessive phosphate and nitrate anions cause eutrophication of lakes and rivers. Current research on the uptake and release of phosphate and nitrate from wastewater is time-consuming and may produce a harmful effect on the environment. Therefore, it is desired for phosphate and nitrate anion to have selectively removal in order to prevent. Layered double hydroxides (LDH) has been successfully used for various field owing to its selectively anion-exchange property. Among them, the calcium-based LDH can improve immobilizing the migration of phosphate and nitrate ions in anti-eutrophication anions. However, only a few studies have investigated the detail adsorption mechanism of CaFe LDH with structure transformation. In this study, we developed an efficient structure for the selective uptake and release of phosphate and nitrate in wastewater based on CaFe LDH. A simple co-precipitation method was applied to prepare CaFe LDH and with metal oxide calcined at 400℃ and 700℃. The adsorption performance was superior as the calcination temperature at 700℃ of CaFe LDH. Its discuss adsorption mechanism of anions by the CaFe LDHs related with structure property variation that happens during calcination process. The characterizations of the café LDH after the adsorption was investigated using ion chromatography, x-ray fluorescence, fourier transform infrared spectroscopy, x-ray diffraction, field emission scanning electron microscopy and transmission electron microscope. |
