Adsorption-Chemical Reduction Romove Cl O₄^-

Perchlorate is harmful to human body and the concentration in groundwater has been increasing in many parts of the word.Hydrotalcite-Like Compounds?HTLCs?is a class of layered double hydroxides.The calcined hydrotalcites are putted in water solution,they may reconstruct the original layer structure.For this properties,it have attracted attention in adsorbents,catalysts and catalyst supports.But it also have many problem in removing anions from drinking water,such as:secondary pollution,difficult in solid-liquid separation,can,t reduction completely.Some researches have been conducted to study as follows:?1?Selecting the Fe instead of Al to synthesis of Mg/Fe-HTLcs and Mg/Fe-CHTLcs,avoid the secondary pullution.The characterization of FT-IR,XRD and SEM have proved that Mg/Fe-HT have same crystal structure and functional groups with HTLCs.The Mg/Fe-CHT can adsorpted ClO₄^-from water solution,the kinetics experiment data of adsorption process are in better agreement with the Pseudo-second-order kinetics model,the adsorptive capacity was 29.83mg/g in 35°C;the adsorption isotherm attributed to he Langmuir model,the maximum adsorption capacity was 144.22mg/g in 35°C.?2?Hydrotalcites with Mg/Fe and Fe₃O₄ were prepared by coprecipitation method.It convenient to realize solid-liquid separation after reaction.The characterization suggest that Fe₃O₄ was loaded to materials and have not affect the properties of HTLcs.The XPS and VSM prove that the materal have magnetism.The kinetics study and equilibrium study of M-CHT adsorpted ClO₄^-were attributed to the Pseudo second order kinetics model and Langmuir model,proving that the adsorption process was chemical adsorption and occurred on homogeneous surface sites.The adsorptive capacity was 13.09mg/g and the maximum adsorption capacity was 110.89mg/g in 35°C.?3?Catalyst with Pd/Co were prepared coprecipitation method.The result show that catalyst have the typical functional and structural with HTLCs material.The kinetics study and equilibrium study prove that catalyst can adsorbed the ClO₄^-,the adsorption process obey the Pseudo second order and Langmuir model.The adsorptive capacity was 26.56mg/g and the maximum adsorption capacity was 87.13mg/g among 24 h in 35°C.Pd/Co-CHT can remove ClO₄^-from water through H₂.The reduction removing rate was 79.22%in the dosage was 3g/L.