بررسی کارایی اثـر نـانـو ذرات نقره در گنـدزدایـی آب آشامیدنی

نوع مقاله : یادداشت پژوهشی

نویسندگان

1 دانشکده کشاورزی، دانشگاه شیراز

2 آب و فاضلاب، شیراز

چکیده

     در این تحقیق، اثر گندزدایی نانو ذرات نقره در آب بررسی شده است. با استفاده از نیترات نقره و سدیم سیترات، نانو ذرات نقره تولید شده و سپس روی پلیمر پلی یورتان پوشش داده شد و از آن به عنوان فیلتر استفاده گردید. مورفولوژی ذرات در محلول با میکروسکوپ TEM، بیشینه جذب نقره در محلول با اسپکتروفتومتر و وجود نقره در پلیمر بعد از پوشش­دهی با EDX تعیین شدند. برای بررسی اثر گندزدایی نانو نقره در آب حاوی باکتری شاخص آلودگی آب (اشرشیاکلی) از محیط­های کشت عمومی نوترینت آگار و محیط کشت اختصاصیEndo-c  آگار استفاده شد. همچنین اثر تغییرات کدورت و pH در راندمان گندزدایی مورد بررسی قرار گرفت. نتایج نشان دادند در آلودگی زیاد (cfu/ml 105×1)، مدت زمان تماس لازم جهت گندزدایی کامل 10 دقیقه می­باشد. در کدورت­های مختلف در pH اسیدی راندمان حذف بین 94-92 درصد بود؛ ولی در شرایط خنثی و قلیایی راندمان حذف به 100% نیز رسید. البته تغییرات کدورت و pH باعث ایجاد تغییرات چشمگیری در راندمان گندزدایی نگردید. همچنین مقدار باقی­مانده نقره در آب بعد از گندزدایی غیر قابل تشخیص بود.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of Drinking Water Disinfection Performance Using Silver Nanoparticles

نویسندگان [English]

  • Masoud Noshadi 1
  • Parisa Ghanbarizadeh 2
1 Faculty of Water Engineering, Shiraz University
2 Faculty of Water Engineering, Shiraz University
چکیده [English]

The usual hazard of drinking water disinfection methods (by products and drug-resistant strains of bacteria) has prompted research on new methods for disinfection. One of these methods is applications of silver nanoparticles on different surfaces (metal, plastic and polymer). Anti-bacterial effect of silver had been known for a long time, but advances in nanotechnology was improved the efficiency of disinfection with silver. However, due to the harmful effects of silver in water, silver should be non-removable on a coated surface and it leaks into the water should be evaluated [1]. Part of Shiraz drinking water are provided from surface water resources (Doroudzan Dam), but chlorination of water can produce trace amounts of byproducts such as trihalomethanes (THMs). Therefore, it is necessary to use alternative methods such as nanoparticles. In this research, effect of silver nanoparticles which coated on polyurethane foams (PU) in drinking water was investigated. Polyurethane (PU) is one of the most attractive synthetic elastomers and is extensively used in biomedical applications due to its good biocompatibility and mechanical properties [2].

کلیدواژه‌ها [English]

  • Disinfection
  • Silver nanoparticles
  • Drinking water
  • Turbidity
  • pH
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