پديد آورنده :
طاهري، ثريا
عنوان :
بررسي بازيافت روي از تايرهاي فرسوده و نانو ذرات خاكستر آن توسط محلولهاي شيميايي و يك خاك آهكي
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان،دانشگاه صنعتي اصفهان،دانشكده كشاورزي
صفحه شمار :
شانزده، 114، [II] ص: مصور، جدول، نمودار
يادداشت :
ص. ع به: فارسي و انگليسي
استاد راهنما :
امير حسين خوشگفتار منش،حسين شريعتمداري
استاد مشاور :
محمد حسن قاضي عسگر
توصيفگر ها :
اسيد نيتريك 4نرمال , پودر تاير
تاريخ نمايه سازي :
26/12/87
استاد داور :
مهران شيرواني، علي اكبر رامين
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتال
چكيده انگليسي :
Abstract Nowadays the uncontrolled dumping of used tires is an important environmental concern From more than one billion used tire accumulated annually worldwide only a small portion is reused Considering high content of zinc in the tires the possibility of using these residues as Zn fertilizer is of great importance Zinc deficiency is a widespread constraint for crop productivity particularly in arid and semiarid regions In this study the recovery of Zn from used tires using chemical solvents and a calcareous soil was investigated Zinc Fe Pb and Cd contents of car and truck tire powder sample obtained from Yazd and Tehran factories were measured The tire sampeles from Yazd factory had the highest Zn content Therefore Yazd tire powder was selected for the rest experiment The average particle size of the ground ash was estimated using SEM analysis as about 80 nm Metals were extracted from tire using different extractants HNO3 4 2 and 0 5 M H2SO4 1 M and dionized water no significant difference was found among different acids in extracting Zn The mean Zn extracted with different acid was about 33 of total Zn content of tire powder Different tire exractant ration of 1 5 1 1 and 1 25 were investigated using to extract Zn Fe Pb and Cd from the sample By increasing the ratio of extractant to the tire extracted Zn increased The highest amount of Zn 6700 mg kg 1 was extracted after 12 hours using HNO3 4 N at a ratio of 1 5 tire extractant The kinetics of metal release from tire by HNO3 4 N at a ratio of 1 5 tire extractant at 25 50 and 70 C0 were also studied By increasing the temperature and time Zn release from the tire increased The retes of Zn release from the tire was faster than Fe and Pb Activation energy calculated by Arhnius model for Zn release was higher than Fe and Pb Isoterms of Zn Fe and Pb release from the tire were studied using HNO3 4 N at a ratio of 1 5 tire extractant during 30 times sequential extraction The data were then modeled using Barewter Barrow and Raven and Hossner equations All three models could well describe the release isotherm of Fe Pb and particularly Zn from tire The kinetics of Zn release from the tire powder and ash nano particles were best described by Parabolic and Elovich equation at low and high Zn concentrations respectively After metal removal from the tire selected physicochemical properties of the acid washed residues were determined and compared with some hydroponics beding substrates The acid washed tire had a lower pH compared to the other substrates but no othersignificant difference was found The possibility of using Zn extracted from tire and its ash as a source of Zn as a nutrient solution culture was investigated The Zn from tire samples in a Johnson solution cold supply tomato plant in a hydroponic experimen The tire ash and powder samples could also increase the DTPA extractable Zn of a calcareous soil sample over six months incubation period The result of this study showed the possibility of using the waste tire powder and its ash as a source of Zn in plant nutrition PDF created with pdfFactory trial version www pdffactory com
استاد راهنما :
امير حسين خوشگفتار منش،حسين شريعتمداري
استاد مشاور :
محمد حسن قاضي عسگر
استاد داور :
مهران شيرواني، علي اكبر رامين
