فهرست:
-١- زئین.........................................................................................................................................................................1
١ -١-١-کاربردهای زئین.....................................................................................................................................................2
1-2-نانوذرات و روشهای سنتز نانو ذرات..........................................................................................................................3
1-2-1-نانوذرات...............................................................................................................................................................3
1-2-2-روشهای تولید نانوذرات........................................................................................................................................3
1-3-آب.............................................................................................................................................................................5
١-3-1-آلودگی آبها........................................................................................................................................................... 5
1-4-ویژگیهای فلوئورید.....................................................................................................................................................6
1-5-راههای ورود فلوئورید به آب....................................................................................................................................7
1-6-مشکلات ناشی از افزایش غلظت فلوئورید در آب....................................................................................................8
١-6-1-فلوروزیس ...........................................................................................................................................................8
1-7-راههای حذف فلوئورید از آب.................................................................................................................................9
1-8-روشهای تعیین فلوئورید.........................................................................................................................................10
١-8-1-تیتراسیون............................................................................................................................................................10
1-8-2-روش پتانسیومتری..............................................................................................................................................10
1-8-3-روش اسپکتروفتومتری .......................................................................................................................................11
1-9-جذب سطحی.........................................................................................................................................................12
صفحه.. عنوان
١-٩-١- جذب و شیمی مربوط به آن..............................................................................................................................12
1-٩-2-انواع جذب سطحی مواد بر روی جامدات..........................................................................................................12
1-٩-3-جذب فیزیکی.....................................................................................................................................................13
1-٩-4-جذب شیمیایی...................................................................................................................................................14
1-٩-5-مهم ترین عوامل موثر بر جذب سطحی..............................................................................................................15
1-9-5-1-طبیعت جاذب...............................................................................................................................................15
1-9-5-2-طبیعت ماده جذب شونده..............................................................................................................................15
1-9-5-3-شرایط محلول..............................................................................................................................................15
1-٥-٩-4-دما................................................................................................................................................................16
١-١0-تعادل های جذب...............................................................................................................................................16
١-١٠-١-ایزوترمهای جذب سطحی...............................................................................................................................17
١-10-١-١-ایزوترم جذب سطحی لانگمویر..................................................................................................................17
-2-1-10-1ایزوترم جذب فرندلیچ....................................................................................................................................18
١١-١-کمومتریکس..................................................................................... ...................................................................19
١- ١2-طراحی آزمایش..................................................................................................................................................20
١-١٢-1-زمینه های کاربردی طراحی آزمایش.................................................................................................................20
١-13 -پنج اصل اساسی در طراحی آزمایش...................................................................................................................23
1-14-ماتریس.................................................................................................................................................................26
-15-1الکترودهای انتخابگر یون (ISE) .........................................................................................................................28
صفحه.. عنوان
-16-1مروری بر کارهای پیشین........................................................................................................................................29
1-16-1-جاذبهای بکار رفته برای حذف فلوئورید........................................................................................................29
2-16-1-الکترودهای انتخابگر یون فلوئورید گزارش شده در مراجع علمی......................................................................34
1-17-اهداف پایان نامه....................................................................................................................................................36
2-1-مواد شیمیایی مورد استفاده.......................................................................................................................................37
2-2- دستگاهها.................................................................................................................................................................38
2-٣-نرم افزارها................................................................................................................................................................38
2-4- روش کار................................................................................................................................................................38
2-٤-1-تهیه محلولها ......................................................................................................................................................38
٢-5- رسم نمودار کالیبراسیون..........................................................................................................................................40
2-6-روش کار مطالعه حذف فلوئورید از محیط آبی ......................................................................................................42
2-7-روش کاربردی رسم ایزوترم های جذب .................................................................................................................43
2-8- بررسی اثر آنیونهای دیگر در کارایی جذب.............................................................................................................43
2-9-تهیهFT-IR وXRD و SEM .............................................................................................................................43
2-10-روش سنتز نانو ذرات زئین......................................................................................................................................43
2-11- روش تهیه الکترود انتخابی یون فلوئورید ............................................................................................................44
3-1-مطالعه حذف فلوئورید از آب با استفاده از جاذب(زئین اصلاح شده با سولفوریک اسید).......................................45
3-1-1-طراحی ترکیب مرکزی........................................................................................................................................45
3-1-2-تفسیر نمودارها..................................................................................................................................................49
صفحه.. عنوان
3-1-3-انتخاب شرایط بهینه.............................................................................................................................................52
3-1-4-تکرار آزمایش در شرایط بهینه و بررسی تکرار پذیری آزمایش ها........................................................................53
3-1-5-بررسی حذف فلوئورید از محلولهای آبی در حضور آنیونهای دیگر.....................................................................53
3-1-6-نتیجه حذف فلوئورید از نمونه آب تهیه شده از مناطق اطراف شهرستان ماکو......................................................54
3-1-7-نتایج حاصل از FT-IR .....................................................................................................................................55
3-1-8-نتایج حاصل از XRD .......................................................................................................................................57
3-1-9-نتایج حاصل از SEM........................................................................................................................................58
3-1-10-نتایج SEM و XRD نانو ذرات زئین..............................................................................................................59
3-2-ایزوترم های جذب................................................................................................................................................ 60
...............................................................................................61 3-3-طراحی الکترود خمیر کربن حساس به یون فلوئورید
3-3-1-انتخاب نسبت اجزاء سازنده الکترود.....................................................................................................................62
3-3-2-مطالعه اثرpH......................................................................................................................................................63
3-3-3-بررسی ویژگیهای الکترود پیشنهادی ....................................................................................................................64
3-3-4-مطالعه انتخابگری الکترود پیشنهادی.....................................................................................................................65
3-3-5-زمان پاسخ دهی و طول عمر الکترود....................................................................................................................66
3-3-6-کاربردهای تجزیهای.............................................................................................................................................66
3-٤- نتیجه گیری..............................................................................................................................................................67
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