Study On Removal Of Dyestuff Wastewater Behavior By Synthesis LDH In-situ

Layered Double Hydroxides(LDH) has peculiar structure and properties, so it has become an important inorganic functional material in the fields of adsorption, ion exchange, catalysis, functional materials and additive.The study on removal of Acid Violet7, Acid Orange7 and Active X-3B in simulated dyestuffs wastewater behavior by synthesis LDH in-situ was carried out in this thesis. Its efficiency and feasibility as well as the mechanism of removal was also discussed.The investigation was carried out on the dependence of removal of dyestuffs by synthesis LDH in-situ to such impacting factors as temperature, time, Mg/Al molar ratio, pH value and so on. The results indicate that, the best parameters of removal of dyestuffs mainly tally to that of synthesis of LDH, and the efficiency of synthesis LDH in-situ is better than that of prepared LDH and LDO. Base on XRD, FT-IR and TEM analysis, it is concluded that: Dyestuff is intercalated into the interlayer of the LDH on the form of interlayer anion. And the arrangement mode of dyestuff for LDH is related to the component and structure of dyestuff, as well as the reaction molar ratio of dyestuff and LDH. The reaction molar ratio of Acid Orange7 and LDH is 1:1, so the arrangement mode of dyestuff in the interlayer of the LDH is double layer and slantwise with the angle tilted 45°;and as same as Active X-3B, the reaction molar ration of Acid Violet7 and LDH is 1:2, so the arrangement modes of them are lateral-monolayer.After calcined, the samples which prepared LDH containing dyestuff also have good efficiency of absorption. But after multi-calcined, hydrating speeds of samples decrease, so that the effect of absorption descend.