بررسی کارایی نانو ذره دی اکسید تیتانیوم به منظور حذف کروم از محلول¬های آبی: مشخصات جاذب و ایزوترم جذب
فصلنامه علمی پژوهشی بهداشت در عرصه,
دوره 6 شماره 2,
1 June 2018
,
صفحه 1-10
https://doi.org/10.22037/jhf.v6i2.21695
چکیده
زمینه و اهداف: کروم از طریق آب آشامیدنی وارد بدن میشود وحذف آن، امری ضروری است. در این پژوهش، از نانو ذره دیاکسیدتیتانیوم به عنوان جاذب استفاده شد.
مواد و روشها: در ابتدا خصوصیات نانوذرات دیاکسید تیتانیوم با استفاده از آنالیزهای XRD و FTIR تعیین شد. آزمایشات جذب به صورت ناپیوسته با استفاده از محلولهای آزمایشگاهی حاوی کروم انجام گرفت و فاکتورهای مختلف pH، غلظت اولیه یون فلزی، زمان تماس و مقدار جاذب بر میزان جذب در سطوح مختلف بررسی شد. همچنین در کلیه مراحل پژوهش موازین اخلاقی رعایت شد و هیچگونه دخل و تصرفی از جانب محقق در مراحل انجام پژوهش صورت نگرفت.
یافته ها: درصد جذب در pH برابر ۳ با اختلاف معنیداری بیشتر از دیگر pHها بود(88/50%) و کمترین درصد آن با اختلاف معنیداری در pH برابر ۳ بود(38/03%). درصد جذب در غلظت 0/5 گرم در لیتر با اختلاف معنیداری بیشتر از سایر غلظتها بود(61/52%) و کمترین درصد جذب با اختلاف معنیداری در غلظت 5 گرم در لیتر بود(6/57%). کارایی جذب در زمانهای مختلف اختلاف معنیداری با یکدیگر نداشتند و میزان جذب بعد از زمان 30 دقیقه به صورت ثابت درآمد. تاثیر مقدار جاذب دیاکسیدتیتانیوم در 4 گرم در لیتر با اختلاف معنیداری بیشتر از دیگر مقدار جاذب بود(68/31%) و کمترین درصد جذب جاذب با اختلافی معنیدار در 1 گرم در لیتر مشاهده شد(18/54%). برازش ایزوترمهای جذب نشان داد که جذب با مدل فروندلیچ مطابقت داشت(0/75=R2).
نتیجهگیری: جاذب دیاکسیدتیتانیوم، کارایی بالایی در جذب فلز کروم از فاضلاب دارد و میتواند برای پالایش فاضلابهای صنعتی مورد استفاده قرار گیرد.
- نانوذره؛ دی اکسید تیتانیوم؛
- ایزوترم های جذب
ارجاع به مقاله
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