| In recent years,with the rapid development and popularization of the interior decoration industry,the indoor formaldehyde pollution problem has attracted increasing cocern environmental problem.It has been the life demands of residents to eliminate indoor formaldehyde to a certain extent,and it is also the research topic by many researchers at both in china.Therefore,the removal of indoor formaldehyde cannot be delayed.In this paper,studies on formaldehyde adsorption by amine functionalized materials were carried out.DETA-MIL-101(Cr)and GMDE-0.5 were successfully prepared by grafting diethylenetriamine groups onto adsorption resin and MOF as matrix materials according to the structural characteristics of formaldehyde.The adsorption properties of DETA-MIL-101(Cr)and GMDE-0.5 were improved significantly.The application of the material in the purifier is also extended to make it closer to practical application.The main research contents and conclusions are as follows:In this thesis,the preparation of polyacrylamide resin and the formaldehyde adsorption capacity on the polyacrylamide adsorption resin were studied.Synthetic resin white balls(GMA)was synthesized by using methacrylate as monomer,divinylbenzene as crosslinking agent via conventional suspension polymerization.Then through the different amount of diethylenetriamine amination reaction,systematically investigated the adsorption resin for indoor low concentration of formaldehyde adsorptio The performance of the polyacrylamide resin was investigated.formaldehyde uptake capacity of ethylene diamine-modified GMDE-0.5 materials could be 88.1%,77.1%higher than before modification.Modified materials can be completely desorption regeneration after 80~oC vacuum heating which has the very good stability of regeneration.According to the calculation of adsorption kinetics and adsorption thermodynamics,theadsorption of formaldehyde conforms to the quasi-second-order kinetics model and the Langmuir model.MIL-101(Cr),a metal organic framework material,was synthesized by solvothermal method and modified by diethylenetriamine to prepare adsorbents with different amine contents.Scanning electron microscopy,Fourier transform infrared spectrometer,thermogravimetric analysis,element analyzer and powder X-ray diffraction were used to characterize the structural characteristics of the materials,and the removal and regeneration properties for the removal of formaldehyde at low concentration at room temperature were discussed.The results showed that,within a certain range,the adsorption performance of formaldehyde increased with the increase of amine load,and the best formaldehyde removal performance of 0.20m L amine modified MIL-101(Cr)was 98.3%;By comparison,the removal rate of unmodified MIL-101(Cr)was 57%.With further increase of the amine content,the removal rate decreased due to the collapse of the skeleton.Moreover,the modified material has better reuse performance,and the removal rate of 89%can be maintained after 5 cycles.The Amine functionalized materials prepared in(1)and(2)were placed in a30m3 laboratory chamber and a air purifier chamber to study their formaldehyde purification effects under standard conditions.The experimental temperature was(23±2~oC)and the relative humidity was(50%±10%).It results showed that DETA-MIL-101(CR)>GMDE-0.5>Activated Carbon.The removal rates of GMDE-0.5 and DETA-MIL-101(CR)were 87%and 96%respectively,which were much higher than that of commercial activated carbon(69%).The removal rates of the three materials used in the purifier were 92%,98%and 72%,respectively.The results show that the Formaldehyde adsorption performance of the two materials optimized by Amine is better than that of activated carbon,and the two materials have a good application prospect. |
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