Preparation Of AlOOH-based Magnetic Materials And Their Applications In Removal And Detection Of Pb²⁺

Water pollution with heavy metal ions has done serious harm to human health,so it should be treated without delay.y-AlOOH can adsorb Pb2+ and often used as an adsorbent for heavy metal ions in waste water.However,the lamellar structure y-AlOOH leads to a stacking and agglomeration,which limits the adsorption propertiy severely.The traditional separation technology,for example,precipitation,centrifugation and so on,are complex and time-consuming,and the adsorbent can not fully recovered,which cause secondary pollution.The most widely used electrochemical detection methods of heavy metal ions are mainly based on the drop mercury electrode at present,which is difficult to be commercialized due to its toxicity.New electrode materials and new electrochemical detection method is becoming the focus of recent research.Herein,the magnetic Fe3O4 and graphene were introduction to designe the structure of ?-AlOOH,which realize the adsorption and rapid separation and the electrochemical detection of heavy metal ions.The details are as follows:1?In this paper,Fe304 magnetic sphere was coated with SiO2,and then AlOOH was in-suit grown on the surface of SiO2 by hydrothermal method.The Fe304@SiO2@AlOOH magnetic composite was prepared and the formation mechanism of flower like AlOOH was explored.The flower like AlOOH avoids the problem of stacking and increases the specific surface area and exposes more adsorption sites.By optimizing the pH of the adsorption system,the adsorption capacity of 184.1 mg/g is achieved.Besides,the superparamagnetic Fe3O4 makes it easier and faster to separate the adsorbent from the solution.2.When growing AlOOH on Fe304@Si02,graphene oxide was added to prepare the reduced oxide graphene,Fe304@SiO2@AlOOH magnetic composite,named(Fe3O4@SiO2@AlOOH)/RGO is gained.Combined with chemical adsorption and stripping voltammetry,using the high conductivity of RGO,the electrochemical detection of Pb2+ was carried out after optimizing the detection conditions.The detection limitwas 8.976×10-8 mol/L,liner ranger was 0.3?1.0?mol/L,and has a goodanti-interference for Cd2+.Fe3O4@SiO2@AlOOH magnetic composite has a high adsorption capacity for heavy metal ions Pb2+ and it is easily separated.Combined with chemical adsorption and anodic stripping voltammetry,(Fe3O4@Si02@AlOOH)/RGO magnetic composite was used to detect the Pb2+,and has a high sensitivity and low detection limit.The material has great application prospects.