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Preparations and Characterizations of Nanoporous Adsorption Materials and Their Application in Cyanobacteria Control

Author: LiuYan
Tutor: BaoFeng
School: Central China Normal University
Course: Organic Chemistry
Keywords: porous adsorption material Maleic anhydride (MAn) /Vinyl acetate (VAc) eopolymer microsphers polystyrene modification cyanobacteria control
CLC: X52
Type: Master's thesis
Year: 2009
Downloads: 42
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Abstract


Porous materials have been the most extensively used when human understand,use and transform nature.From the application of ancient earth and stone to the most promising developent of gas storage materials in modern times,the interdisciplinary research field of porous materials has covered many subjects,such as chemistry,physics, mathematics,materials,energy sources,computer science and so on.The eutrophication of natural waters has led to an increase in the incidence of cyanobacteria,which subsequently causes the deterioration of water resources and seriously affects the scenery.Physical,chemical and biological approaches to curb cyanobacteria there have been used,and some of them have made positive effects, however,these methods were also limited in practical use.In this thesis,Maleic anhydride（MAn）/Vinyl acetate（VAc）copolymer microsphers were choosed as templates to prepare polystyrene（PS） nanoporous adsorption materials.Two improvements have been made:（1） coating nano-TiO2 on the surface of nanoporous polystryene with sol-gel method to modify PS;（2） preparing 4-vinyl phenol and replacing styrene partially to prepare polystyrene-poly（4-vinyl phenol） nanoporous adsorption materials;then applied these three kinds of nanoporous adsorption materials in cyanobacteria control and curb the growth of cyanobacteria.The study results told us that the diamete of the copolymer microspheres could be precisely controlled by changing the monomer concentration or the feed ratio.The copolymer microspheres was prepared with dispersion copolymerization when MAn and VAc as the monomers,Benzoyl peroxide（BPO） as the initiator and butyl acetate as the reaction medium.The dispersion copolymer microspheres could be obtained when the monomer concentration changed in the range of 0.4-2.0mol/L or mass ratio changed in the range of 8%-40%,and the diametes of the copolymer microspheres were 177-750 nm.The yeild of PMV was maximum when the feed ratio was 1.PS nanoporous adsorption material was prepared with template method while PMV copolymer microspheres as templates,BPO as the initiator and divinylbenzene（DVB） as the crosslinker,the pores were crosslinked.The experiments demonstrated that the three kinds of nanoporous adsorption materials had good adsorption effect when they were used for cyanobacteria control,and the effects of modified PS were higher.In the end of thesis we explored the mechanism of three nanoporous adsorption materials with the study results and theory knowledges.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Water pollution and its control
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