Preparation Of Catalytic Micromotors Based On Prussian Blue Analogs Derivatives And Their Application In Environmental Remediation

Micromotors have great application potential in the field of environmental remediation due to their compact design,excellent self-mixing ability,easy modification,and low power consumption.Due to the advantages of low cost,easy preparation,open framework and tunable components,prussian blue analogues derivatives are favored by catalytic micromotor researchers.The work in this thesis is mainly to prepare new types of bimetallic prussian blue derived oxides micromotors by co-precipitation and heat treatment,which exhibit excellent autonomous motion performance and directional controllability in H₂O₂solution,and are applied to the removal of organic pollutants such as Rhodamine B and phenol in water.The main research contents and results are as follows:1.Spherical and cubic-shaped Mn-Fe PBAs derived micromotors were prepared by co-precipitation and heat treatment methods using Mn²⁺as the central metal ion and Fe（CN）₆^3-as the ligand,along with the addition of different levels of citrate for modulation.The results showed that the micromotors with hollow structures can catalyze the generation of O₂from H₂O₂solution and thus achieve autonomous motion.Among them,the velocity of cubic Mn-Fe oxide micromotors reached 71.21μm?s^-1in 1%H₂O₂solution and could achieve autonomous motion in as low as 0.3%H₂O₂solution.The velocity of the spherical Mn-Fe oxide micromotor could also reach 43.07μm?s^-1in 1%H₂O₂solution.In addition,the Fe₃O₄contained in the micromotor could not only control the direction of motion by magnetic field,but also be recycled in time.Finally,the removal capability of the cubic Mn-Fe oxide micromotor for the simulated pollutant Rh B was further investigated based on the dual mechanism of adsorption bubble separation（ABS）and Fenton oxidation.The results showed that the cubic micromotor could remove up to 95.2%of Rh B within 30 min with high reproducibility.The design idea of combining PBAs and MNMs realizes the application of MNMs in the field of environmental remediation.2.Spherical and hexahedral Mn-Co PBAs precursors were controllably synthesized by co-precipitation,and then Mn-Co derived oxides micromotors with different morphologies with high catalytic properties were obtained by regulating the annealing temperature.The relationship between the motion speed of the micromotor and the concentration of H₂O₂solution,the effects of static and dynamic degradation,the amount of micromotor and the concentration of H₂O₂solution on the degradation effect were investigated for the target pollutant phenol.As the H₂O₂concentration increased from 1%to 10%,the kinematic velocity of spherical micromotors increased from 23.56μm?s^-1to 125.25μm?s^-1,while the kinematic velocity of hexahedral micromotors increased from 14.52μm?s^-1to 51.57μm?s^-1.The mixed metal oxide micromotors not only showed excellent kinematic performance at low concentrations of H₂O₂based on synergistic effects（0.7%）,but also showed amazing abilities in the degration of phenol within 30 min.It was worth mentioning that,the micromotors with excellent magnetic properties allowed directional motion in magnetic field and enabled immediate recovery after the reaction,greatly avoiding secondary pollution to the environment.The materials are widely available and easy to prepare micromotor provides a practical strategy for environmental remediation.