Preparation And Performance Research Of Electrospinning Nanofiber Membrane Based On Prussian Blue Analogues

Prussian blue analogues material has the characteristics of simple synthesis,low raw material cost,low toxicity,nanoporous open framework and large specific surface area,so it has a wide range of applications.In recent years,the preparation of PBA/polymer composites based on electrospinning technology has attracted wide attention of researchers.However,there has been no progress in stimuli-responsive color-changing and catalytic peroxymonosulfate(PMS)in the field of water treatment.In this thesis,the Co-PBA material and electrospinning technology are combined to prepare two Co-PBA/polymer composite nanofiber membranes,and their discoloration in response to dual stimuli of heat and solvent and catalytic properties are studied respectively.1.Dual-Stimuli Responsive Color-Changing Nanofibrous Membranes as Effective Media for Anti-Counterfeiting and Erasable WritingIn this part,the Co-PBA/PAN nanofiber membranes were prepared via electrospinning of a DMF solution of Co-PBA nanoparticles and the polymer PAN.The morphology,microstructures and thermo-and solvo-chromic properties of Co-PBA/PAN nanofibers were carefully characterized and investigated.Specifically,the Co-PBA/PAN nanofibrous membranes exhibited obvious color changes from light pink to purple upon exposure to heat or solvents(e.g.ethanol)with excellent stability,reversibility and cycle performance.Therefore,the Co-PBA/PAN nanofibrous membranes can be used in the security field,such as making anti-counterfeiting marks.Such anti-counterfeiting materials with dual-stimuli responses not only make the verification process convenient and quick,but also make forgery difficult.The thermo and solventchromic nanofibrous membrane can be used as an excellent printing medium for document authentication.In addition,anti-counterfeiting labels with extended complexity were also fabricated by exploiting the tunable transition temperature and loading content of Co-PBA.Morever,taking advantage of these features,dual-stimuli responsive anti-counterfeiting and erasable writing for secret communications have been successfully achieved.Specifically,by using templates with corresponding openwork patterns for heat transfer,several patterns were well recorded on same area of Co-PBA/PAN-70 wt%under the cyclic "writing" and"erasing" steps.In addition,the numbers and patterns that were hand-written/drawn on same area of Co-PBA/PAN-70 wt%used a Chinese writing brush with ethanol as ink in different "writing" and "erasing" steps.More importantly,whether it is heating or ethanol,no obvious marks are left in the written area,which is highly desirable for erasable paper.This work not only provides efficient materials for information security but also inspires the design of multi-responsive color-changing systems for the applications beyond.2.Polydopamine-mediated Co-PBA Nanofiber Membrane for Photothermal-Enhanced Catalytic Degradation of Antibiotic PollutantsIn this part,we first coated polydopamine(Polydopamine,PDA)on PAN nanofibers,and then supported Co-PBA on the surface of PAN@PDA fibers by in-situ growth method.Specifically,PDA has rich catechol groups,which can easily adhere to the fiber,and it can also be used as an anchor of metal ions to drive Co-PBA deposition on PAN@PDA nanofibers.More importantly,the PDA-mediated Co-PBA nanofiber membrane also exhibited an excellent solar photothermal effect,which was efficient for accelerating the catalytic degradation of antibiotic pollutants.The rate constant(k)was to reach 0.432 min-1.This is the first time that photothermal conversion materials have been introduced into the field of degradation antibiotic pollutants,which has great application value in rapid treatment of organic pollutants in wastewater.