Preparation Of Bimetallic Oxide Based Micromotor And Its Application In Wastewater Treatment

Micromotors are widely used in environmental remediation,biology,pollutant adsorption and other fields because of its small size,environment protection,long-life and other characteristics.Among many different kinds of micro-nano-motors,hydrogen peroxide based micromotors are the most common which use precious metals such as Pt and Au to catalyze hydrogen peroxide to generate bubbles and promote the movement of micromotors in the early development.However,it is hard to commercialize the mass production because of the high cost of materials used and the relatively complicated preparation methods.In fact,the micro/nano devices which are self-driven in liquid need to overcome the interaction of Brownian motion and low Reynolds number,so many problems still need to be solved.In addition,considering the catalytic efficiency,motion controllability and biocompatibility of the micromotors,this is still a challenging topic.Therefore,it is a hot topic that prepare of micromotors with high catalytic efficiency,controllable direction of motion and simple method.In view of the above problems,we have carried out two aspects of work:1 Through the preparation of needle like Ni Mn hollow microspheres,the direction controllable micro nano motors were obtained and applied to dye adsorption.The Ni O and Ni₆Mn O₈ in the microspheres can catalyze the reaction in very low concentration hydrogen peroxide solution to produce bubbles and promote the movement of the microspheres.In this study,scanning electron microscopy(SEM)and transmission electron microscopy(TEM)were used to characterize the morphology,Raman spectroscopy(Raman)and X-ray diffraction(XRD)were used to analyze the products,and ultraviolet spectroscopy(UV)was used to test the adsorption of organic dyes.It can be found that the microsphere can replace the noble metal in the very low concentration of hydrogen peroxide solution(0.4%).In addition,it has long-life time of 2.5h and can move along the magnetic field direction.In the application experiment of methylene blue adsorption,the microspheres also showed good adsorption performance,and the pollutants were effectively adsorbed and recovered within 160s.2 Co-Mn oxides were prepared by a simple one-step solvothermal method and annealed in argon atmosphere to prepare micromotor materials.Co-Mn oxides produce oxygen by catalyzing hydrogen peroxide and follow the bubble drive.The metal oxides of the derivatives produce oxygen by catalyzing hydrogen peroxide and follow the bubble drive.Two kinds of catalytic micromotors(spheres and hexahedrons)with different morphologies were obtained by using different solvents as templates.The composition of the micromotors was analyzed by XRD and EDS,and by SEM and TEM.The motor with different morphology was placed in hydrogen peroxide solution,and the movement was observed by inverted optical microscope.It is worth mentioning that the direction of Micromotor can be controlled by magnetic field.The spherical micromotor can also move at high speed in 1%hydrogen peroxide,and its life is up to 2 hours.