Preparation And Application Of Functionalized Polymer Tubular Fiber

Polymer fibers have become a research hotspot in the field of materials due to their controllable structure and morphology,as well as large specific surface area.In this work,divinylbenzene(DVB)was used as a monomer to successfully prepare functionalized polymer fibers,including sulfonated polymer fibers/silver nanocomposites(Ag-SPNTs)and Janus polymer fibers hollow spheres(HSPHS).and their applications in particulate matter captured,dye adsorpted and photocatalytic degradation were researched.The main contents of this paper is as follows:(1)Ag-SPNTs were prepared by template-free cationic polymerization.Ag-SPNTs have coarse surface and bamboo-like tubular structure with a diameter of ca.80-150 nm.Ag nanoparticles were embedded on the sulfonated polymer fibers surface and the content of Ag nanoparticles in the sulfonated polymer fibers could be tuned by changing the concentration of[Ag(NH₃)₂]⁺in the preparation process.f-d curve measured by AFM half-contact mode showed that surface force of Ag-SPNTs is greater than that of sulfonated polymer fibers(SPNTs),and increasing the content of Ag nanoparticles in the sulfonated polymer fibers resulted in the enhanced surface force of sulfonated polymer fibers.Particulate matter captured test showed that the number of captured micro-/naonoscaled particulate matters on the fiber surface increased obviously for Ag-SPNTs compared to the sulfonated polymer fibers without Ag nanoparticle(SPNTs),probably due to the high surface energy Ag nanoparticles increasing surface force of SPNTs.Thereby,the interaction force between the surface of the SPNTs and the particulate matters is enhanced,and the capture efficiency of the Ag-SPNTs is finally improved.Filtration property test showed that the Ag-SPNTs fiber films had a better filtration performance with a higher filter efficiency and QF value than that of SPNTs.(2)Janus polymer fibers hollow spheres were prepared via cationic polymerization using Si O₂nanoparticles as interface protection cores and sacrificial templates.Sulfonic acid groups(-SO₃H)were introduced into the surface of HSPHS by sulfonation and facilitated the further loading of titania.HSPHS could be applied as efficient adsorbents to remove both hydrophilic dye rhodamine B(RB)and hydrophobic dye dimethyl yellow(DMY)from the surrounding solution,and the results showed that>98%of RB or/and DMY could be removed within several minutes.The maximum dye adsorption capacity of HSPHS 3.48 and 0.14 mol g^-1 for RB and DMY,respectively.In addition,the HSPHS can also serve as catalyst scaffolds to load anatase titania for the photocatalytic degradation of RB.HSPHS coated with anatase titania(HSPHS@Ti O₂-An)demonstrated a remarkable photocatalytic efficiency and recyclability.High photocatalytic activity was observed for HSPHS@Ti O₂-An and the catalytic efficiency remained with almost no loss of the photocatalytic activity even after five catalytic cycles.Thus,the Janus polymer fibers hollow spheres have promising application in water treatment as efficient adsorbents and catalyst scaffolds.