سنتز و مشخصه يابي نانو كامپوزيت هاي دي اكسيد تيتانيوم - رس براي حذف كروم و گاز دي اكسيد گوگرد

چكيده انگليسي :

Synthesis and Characterization of TiO2 Clay Nanocomposites for Cr VI and SO2 Removal Nasibeh Amini Nasebeh amini@na iut ac ir May 30 2016 Department of Natural Resources Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree MSc Language PersianSupervisor Dr Mohsen Soleimani m soleimani@cc iut ac irAbstractNowadays the maintenance and improvement of environmental quality is considered as an importantchallenging issue in all countries of the world Population growth and consequently the rapid expansionof industry and technology to overcome their needs have been increased environmental pollutions inrecent years Water pollution by heavy metals and air pollution by SO2 and NOx are the examples of thisproblem Therefore control and removal of environmental pollutants using various methods isnecessary The use of titanium dioxide TiO2 nanoparticles is considered to be very important in allover the world because of unique property and high efficiency at removal of pollutants The highabsorption capacity and cheapness of nanoclays have attracted a lot of attention Therefore combinednanoclay with TiO2 not only increases the photocatalytic efficiency of titanium dioxide but alsoenhances the removal of pollutants In this study TiO2 clay nanocomposites synthesis via variousnanoclays including bentonite zeolite Ze sepiolite and montmorillonite carried out in order to removeCr VI and SO2 from polluted water and air respectively The results showed TiO2 Ze nanocompositeswere the most efficient sorbents among the selected aorbents in removal of chromium and SO2 whichused in other experiments In addition for improvement of the sorbent characteristics and reusecapability of nanocomposites they were modified using the surfactant poly oxypropylene amines POP Characterizations of nanocomposites were investigated using XRD SEM EDX and BETanalyses Cr VI and SO2 concentrations were measured using atomic absorption spectroscopy AAnalyst 700 and MRU VARIO plus SE respectively The initial concentration of Cr VI and SO2were 5 and 543 mg L 1 in all experiments respectively The influence of initial pH values 1 2 3 4 5 catalyst dose 2 4 6 8 10 g L 1 and initial concentration of Cr VI 5 10 15 20 25 mg L 1 onphotocatalytic reduction of the element were investigated Furthermore the influence of initial moisturevalues 0 2 5 catalyst dose and ultra violet UV intensity 0 32 64 W m2 on photocatalyticreduction of SO2 were also investigated The results showed that maximum Cr VI removal conditions adsorbent 10 g L 1 Cr VI conc 5 mg L 1 pH 2 by Ze TiO2 POP Ze Ti and Ze were 97 88 and20 respectively The experimental data fitted well to the pseudo first order kinetic model and thisshowed that the adsorption process was very rapid by the zeolite and synthesized nanocomposites Theresults of SO2 adsorption were fitted well to L H kinetic model which showed the impregnatednanocomposites surface The results showed that maximum removal of SO2 conditions adsorbent 1 3g m 3 SO2 conc 543 mg L 1 UV intensity 64 W m2 by Ze TiO2 POP Ze Ti and Ze were 95 91 and 32 respectively The results revealed that Ze Ti nanocomposites had a high potential to removeCr VI and SO2 from the contaminated environments Considering the high potential of the Ze TiO2nanocomposites their application to remove of other heavy metals from the water systems and pollutantgases e g NOx greenhouse gases and volatile organic compounds is recommended in futureresearches Keywords Air pollution TiO2 Zeolite Polyoxypropylene surfactant Photocatalyst

اميني، نسيبه

سنتز و مشخصه يابي نانو كامپوزيت هاي دي اكسيد تيتانيوم - رس براي حذف كروم و گاز دي اكسيد گوگرد

دي اكسيد تيتانيوم , زئوليت , سورفكتانت پلي اكسي پروپلين , فتوكاتاليست