Study On The Preparation And Properties Of Hierarchical Structure Oxide

With the rapid development of modern industry,factories always discharge effluent containing heavy metal ions and dyes,which can bring about serious environmental threats and serious hazards to ecosystem and human health,respectively,due to their toxicity.If not promptly and effectively removed those toxic contaminants will directly threaten human survival.Adsorption method is believed to be an ideal method for the treatment of wastewater owing to its large removal ability,less expensive,economical,easy operation.In this work,?-AlOOH and ?-Al₂O₃ nanoparticles were synthesized and its adsorption capacity for several pollutants in industrial wastewater was investigated,such as Cr?VI?,Congo red,as to provide a more reliable innovative data for the treatment of wastewater.Some innovative results have been obtained,and the specific results are as follows:?1?Using aluminum sulfate as aluminum source,urea as precipitant and pH regulator and CTAB as pore forming agent by one-step hydrothermal method,the urchin like ?-AlOOH and ?-Al₂O₃ hollow structural materials were prepared and its application on Congo red dye adsorption was studied.The experimental results showed that the hierarchical hollow structure AlOOH can be produced only with aluminum sulfate as aluminum source,and the sample particles prepared by the method of CTAB as the dispersing agent and pore forming agent were homogeneous and well dispersed.The adsorption capacity of the sample to Congo red was in accordance with the Langmuir monolayer adsorption theory,and the maximum adsorption capacity of Congo red was qmax=416.50mg/g,which can achieve fast and efficient adsorption.After high temperature calcination,desorption process can be realized,and the performance of the sample was excellent.These peculiar characteristics showed that the multi stage hollow ?-AlOOH and ?-Al₂O₃ can be used as a new,efficient and efficient adsorbent for the removal of organic pollutants from wastewater.?2?Fe₃O₄@ ?-AlOOH magnetic adsorption material was successfully prepared by three steps method and its application to Cr?VI?ion adsorption was studied.The results of the study indicated that: during hydrothermal experiments process,SiO₂ transition layer was etched,the internal material was hollow and annular structure,the sample surface on the grounds of nanosheets were woven into hierarchical structure and abundant pore,the ratio surface area and magnetic performance was good.Under the optimal adsorption conditions,the maximum adsorption effect?qmax=34.23mg/g?of 40mg/L was achieved at about 20 min,with the advantages of rapid response,high adsorption rate and large adsorption capacity.The adsorption process of Cr?VI?on the sample surface was conformed to the Langmuir monolayer adsorption model,which was mainly realized by three ways: electrostatic adsorption,ion exchange and redox.