Synthesis Of Plate-like Potassium Magnesium Titanate And Application In Removal Of Copper Ions From Aqueous Solution

Layered inorganic materials have been widely used in variety of useful applications, such as catalyst, ion conductors, ion exchangers, and electrode materials etc. Focused on this application area, KMTO with lepidocrocite-related structure were fabricated by the flux method and the synthesis process and application in removal of copper ions from polluted water have been reported firstly. The main contents of the present dissertation are listed as follows:1) The synthesis process of K0.8Mg0.4Ti1.6O4has been systematically studied, and the relationship between synthesis conditions has been reported firstly. It reveals that the different molar ratio of Ti/K, calcination temperature, and calcination time have important influence on the composition and morphology of the final product. The best Ti:K:Mg molar ratio to obtain the plated-like K0.8Mg0.4Ti1.6O4powder is4.1:2:1.2) The reaction temperature does not affect the formation of lepidocrocite-related K0.8Mg0.4Ti16O4, while the size of final product increases with increasing temperature.3) The calcination time does not affect the formation of lepidocrocite-related K0.8Mg0.4Ti1.6O4, while the intensity of peaks increases with increasing calcination time. The best calcination time to obtain the plated-like K0.8Mg0.4Ti1.6O4powder is2h.4) The concentration of KC1has important influence on the composition and morphology of the final product. The best concentration of KC1to obtain the plated-like K0.8Mg0.4Ti1.6O4powder is20%.5) The application of potassium magnesium titanate (KMTO) in removing copper ions from water pollutants was firstly reported. Results show that the maximum adsorption capacity is about290.67mg/g and almost99.9%of Cu2+ions can be removed, which is much higher than other sorbents reported. The kinetics of KMTO for the adsorption of Cu2+ions can be fitted by the pseudo-second-order model. This study highlights that K0.8Mg0.4Ti16O4is a potential material for the efficient removal of heavy metal ions in polluted water. The work also opens up a new opportunity for the applications of KMTO.