Synthesis And Properties Of The Copper-aluminum Hydrotalcite

With the development of science and technology,A variety of new highly effective pesticides are widely applied to agriculture,which brought great convenience,save a great deal of labor and has brought enormous economic benefits.But,at the same time,people's health is also suffering from the torment of its residues.As people's living standards improving, more people transferred their attention to environmental protection and pollution treatment,the sewage treatment has been one of the hot research problems.Hydrotalcite-like is layered structure with nano-particles,With interlayer exchangeable anions,memory function of composite oxide,a larger surface area,the rich source,the economic price,it has such a strong adsorption capacity of various heavy metal ions,organic anions,inorganic anions that can be used to deal with sewage with low concentration.The thesis is divided into five chapters.The structure of hydrotalcite-like,characteristic and application status were introduced in details in the first chapter.ChapterⅡuse the adjustable variability of HTlc,synthesized Cu-Al Hydrotalcite-like with Cu:Al=2,3,4 separately by microwave crystallization method and the hydrothermal crystallization method.By XRD analysis,the Products are pure When Cu:Al=2,so,the preparation of Cu-Al composite oxides chose hydrotalcite of Cu:Al=2 as a former body.After DSC analysis,Selected 550℃as the calcinated temperature to prepare Cu-Al composite oxides.The TEM diagram of Cu-Al Hydrotalcite-like showed that the Cu-Al Hydrotalcite-like are hexagon-shaped with lamellar structure,crystal prepared by microwave looks structured while crystal prepared by hydrothermal morphology less.FT-IR characterization of the samples determined the functional groups changes of Cu-Al Hydrotalcite-like before and after calcination.XRD characterization of complex oxides confirmed its major components and crystal characteristics.Cu-Al mixed oxides have been immersed in 10%ethanol solution 24h,dried,XRD characterization of its product showed that layered structure did not restore.However,FT-IR found the soaked mixed oxides have adsorbed amount of ethanol molecules,so,they have the adsorption properties.BET characterization showed the following order of the product s' surface area:Cu-Al Hydrotalcite-like> mixed oxides> soaking product.ChapterⅢfirst introduced the adsorbent's research status,then studied the adsorption properties of 2,4 D on Cu-Al Hydrotalcite-like and mixed oxides.Experiments show that the adsorption isotherm of the 2,4 D on Cu-Al Hydrotalcite-like and mixed oxides in line with the Languedoc Miao adsorption isotherm,the Absorption efficiency of 2,4 D on Cu-Al Hydrotalcite-like is higher than the composite oxide,and the adsorption efficiency of hydrotalcite prepared by microwave was higher than hydrotalcite prepared by Hydrothermal. Through FT-IR characterization verified the adsorption of 2,4 D on Samples.ChapterⅣexamined the absorption situation of 2 methyl 4 chloro on Cu-Al Hydrotalcite-like and mixed oxides.Experiments show that the absorption efficiency of 2 methyl 4 chloro on Cu-Al Hydrotalcite-like is higher than the composite oxide,and the adsorption efficiency of hydrotalcite prepared by microwave was higher than hydrotalcite prepared by Hydrothermal. Through FT-IR characterization verified the adsorption of2 methyl 4 chloro on Samples.Chapter V made a summary of the first four chapters of the thesis and asked questions,made the outlook.