امكان سنجي كاربرد نانو الياف علمدارشده با سيكلودكسترين در تصفيه پساب حاصل از رنگرزي كالاي سلولزي

چكيده انگليسي :

Feasibility Study of Application of Cyclodextrin Functionalized Nanofiber to Cellulosic Dyeing Wastewater Purification Foza Foroozmehr f foroozmehr@tx iut ac ir September 2011 Department of Textile Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Dr Sedigheh Borhani sborhani@cc iut ac ir Dr S Abdolkarim Hosseini hosseinir@cc iut ac irAbstractThe large volume of water and chemicals used in textile industry causes the pollution load to becomehigh among the other industries Among the pollutants produced in this industry dyes are more toxicthan the others and their presence is more appeared in the environment Due to high molecular weightand aromatic structure reactive dyes that are used for cellulosic products are more toxic than otherdyes These dyes are highly soluble in water and cannot be easily removed by common wastewatertreatments For these reasons in this study the removal of reactive dye from simulated wastewater wasinvestigated Among the methods that treat wastewater using membrane filtration with nanofibrous membrane canbe more effective than other methods Because these membrane are too porous and the pores are interconnected Also they can be easily functionalized in nano scale In this research we first tried to use nanofibrous membrane produced by electrospinning of13 w w PAN DMF solution to remove C I Reactive Blue 13 from a simulated waste water The dyeconcentration in the waste water was 0 2 g l Accordingly the effect of various parameters such as thetype of filtration system dead end cross flow time of electrospinning and applied pressure wereanalyzed In cross flow filtration system with the applied pressure 1 9 bar the decolorization efficiency of 16 was obtained Investigating the duration of electrospinning showed that four hours of electrospinningis suitable to obtain a higher efficiency Alum was used as a coagulant to increase the color removal efficiency In alum concentration1500 ppm in conditions stirring solution in terms of speed 1000 rpm pH 3 94 room temperatureand suddenly adding 79 25 decolorization efficiency was achieved In the following using cyclodextrins to functionalize nanofibers and improving the color removalefficiency of them were investigated Cyclodextrins are natural based materials that have cavity intheir structure because of connected glucose units Since the cavity of cyclodextrin is hydrophobic andcan form inclusion complex with pollutant molecules this material was used to functionalize the PANnanofibers and increase decolorization efficiency of membrane by forming inclusion complex betweendye molecule and cyclodextrin cavity By electrospinning of PAN CDP solution for four hours andfiltration the wastewater the color removal efficiency 24 was obtained But after filtration ATR FTIR spectra of membrane surface showed that cyclodextrins have exited from the surface Hence in the following the beta cyclodexrin polymer was produced This insoluble polymer was theproduction of cross linking beta cyclodextrin with citric acid at 140 C for 4 hours Results ofelectrospinning and filtration of wastewater solution with nanofibrous membrane prepared by 15 25and 50 w w PAN CDP showed the optimum concentration of beta cyclodextrin polymer was15 w w and with this concentration and 4 hours electrospinning of PAN CDP solution at appliedpressure 1 9 bar color removal efficiency 31 39 was achived Thermal Gravimetery Analyze TGA of dye before and after filtration indicated that the degradationtemperature of dye has been increased Also the presence of peaks belong to channel crystal inX Ray Diffraction XRD pattern of membrane after filtration proved that the dye molecules exist inbeta cyclodextrin cavity and form inclusion complex Key Wordswastewater nanofibrous membrane filtration coagulant beta cyclodextrin inclusioncomplex

فروزمهر، فوزي

امكان سنجي كاربرد نانو الياف علمدارشده با سيكلودكسترين در تصفيه پساب حاصل از رنگرزي كالاي سلولزي

فيلتركردن , انعقاد , كمپلكس درهم جاي