Performance Of Porous Aromatic Framework Based On Scholl Reaction And Its Composites In The Treatment Of Volatile Organic Compounds

Volatile Organic Compounds(VOCs)are considered to be an important part of modern industrial pollution,because most of them are toxic,mutagenic and carcinogenic,which seriously threatens human health and the ecological environment.So far,there have been many materials for processing VOCs,such as activated carbon,zeolite,metal-organic framework and so on.Porous Organic Frameworks(POFs),especially the aromatic organic frameworks(PAFs)based on multi-phenyl-ring structure due to their special phenyl group framework,large surface area,and micropore range and the strong hydrophobicity provide great possibilities for the effective treatment of VOCs in the environment.However,so far,the use of PAFs to treat aromatic organic pollutants,this meaningful work has not been systematically reported.In order to make up for the gap in this field,this thesis is devoted to the representative porous aromatic framework material PAF-45 and composite materials based on PAF-45,and explores its performance and application in processing VOCs.First,we successfully constructed a porous aromatic framework(PAF-45)by Scholl Reaction.PAF-45 with a wholly aromatic framework,intrinsic microporosity and ?-? conjugation system shows excellent performance in volatile organic compounds pollutant removal.It exhibits high adsorption capacity of VOCs and certain photocatalytic performance.As adsorbent,PAF-45 can adsorb 35wt% benzene and 68wt% chlorobenzene in the static adsorption experiments under room temperature and pressure.In benzene simulation wastewater,PAF-45 also shows excellent adsorption capacity,without significant reduction after 10 cycles of adsorption-desorption process.Moreover,PAF-45 exhibits impressive photocatalytic degrade ability of volatile organic compounds,like aniline and phenol,under visible light illumination.In order to further optimize the adsorption and photocatalytic performance of PAFs materials,and to better control the synthesis cost,we have synthesized PAF-45/KAL composite with Kaolin doping during Scholl Reaction,that Kaolin is loaded into PAF-45.The composite material possesses better performance in adsorption and photocatalytic degradation of volatile organic compounds(VOCs)than that of PAF-45.The Kaolin doping changes the polymerization method of PAFs,that turn random polymerization into more fixed-position polymerization.Because of the variation of polymerization method,PAF-45/KAL's pore structure got effectively changed.The composite has not only original micropores but also more mesoporous structure compared with PAF-45.In the static adsorption experiments under room temperature and pressure,PAF-45/KAL could uptake 10-50% more VOCs than PAF-45,for example,50% more for chlorobenzene.Moreover,the photocatalytic ability of PAF-45/KAL gets promoted under visible light illumination,that it could decompose same amount of colorless aniline in shorter time.More importantly,owing to the clay is natural mineral,doping with Kaolin to improve porous organic materials' performance is a low-cost and environmental method.