ارزیابی تاثیر استفاده از نانوذرات آهن بر پارامترهای ژئوتکنیکی خاک‏های آلوده به فلز کادمیوم

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی عمران، دانشگاه آزاد اسلامی واحد تهران مرکزی، تهران، ایران

چکیده

امروزه آلودگی خاک‏ ها و آب‏ های زیرزمینی توسط آلاینده‏ های سمی و خطرناک، به عنوان یک معضل زیست‏ محیطی در گستره وسیعی مطرح شده است. آلوده‌شدن خاک‌ها به فلزات سنگین به‌ویژه کادمیوم علاوه بر آثار زیان‏بار بر سلامت انسان ‏ها و اکولوژی زمین، باعث ایجاد تغییر در خصوصیات ژئوتکنیکی خاک‌ها می‌شود. روش‏ های مختلفی برای احیاء خاک ‏های آلوده به کادمیم وجود دارند که یکی از این روش ‏ها، تثبیت این فلز سمی‏ در خاک توسط نانوذرات آهن صفر ظرفیتی است. هدف از این پژوهش، بررسی تاثیر فلز سنگین کادمیوم بر برخی ویژگی‏ های ژئوتکنیکی خاک با استفاده از آزمایش‏ های حدود اتربرگ، مقاومت فشاری و تراکم و تثبیت این آلودگی در خاک و بررسی ویژگی‏های مذکور خاک تثبیت‌شده با استفاده از نانوذرات آهن است. به‌همین منظور، ابتدا نمونه‌های خاک پایه متشکل از 60، 65 و 70% رس کائولینیت و به ترتیب 40، 35 و 30% ماسه برای بررسی تاثیر کائولینیت در آزمایشگاه ساخته شد. برای تاثیر بررسی غلظت کادمیوم، نمونه‌های خاک پایه با غلظت‌های 10، 20، 40 و ppm60 کادمیوم نیترات آلوده شدند. در انتها برای تثبیت نمونه‌های خاک آلوده، نانوذرات آهن صفرظرفیتی به نمونه‌های مذکور اضافه گردید. نتایج نشان‌دهنده تأثیر بسیار بالای تغییر در مقدار کائولینیت و کادمیوم و وجود نانوذرات آهن صفرظرفیتی بر پارامترهای ژئوتکنیکی خاک است. با افزایش غلظت کادمیوم، میزان کادمیوم جذب‌شده توسط نانوذرات آهن به‌مقدار چشمگیری کاهش یافت. هم‌چنین، نتایج آزمایش‌های تک‌محوری انجام‌شده نشان داد که تنش تک‌محوری نمونه‌های با نانوذرات آهن به‌ترتیب 45/6، 63، 67/1 و 67/7 % در مقایسه با نمونه‌های مشابه آلوده به کادمیوم بدون نانوذرات آهن افزایش یافته است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Evaluating the effect of using iron nanoparticles on geotechnical parameters of soils contaminated with cadmium

نویسندگان [English]

  • Michael Kazemzadeh
  • Pezhman Zoghi
  • Amir Ali Zad
Department of Civil Engineering, Islamic Azad University, Central Tehran Branch
چکیده [English]

In the present day, the widespread environmental issue of soil and groundwater contamination with hazardous and harmful pollutants has garnered significant attention. The change in the soil's geotechnical characteristics is one of the most significant consequences of the entry of metal contaminants into the soil. Different methods are used to reduce the amount of pollution and stabilize soils contaminated with heavy metals, one of these methods is the use of zero-valent iron nanoparticles. In this study, the effect of using zero-valent iron nanoparticles on the stabilization of cadmium-contaminated soils has been investigated. The base soil samples investigated in this study were a combination of clay and sand. After making the base soil samples, the base soil samples were contaminated with cadmium with concentrations of 10, 20, 40, and 60 ppm. After contamination of the samples with cadmium, zero-valent iron nanoparticles were added to the contaminated samples to stabilize the contaminated samples. Finally, on all the samples, tests of Atterberg limits, unconfined compressive strength, and compaction were performed. The results of the tests performed on the contaminated samples without stabilizers showed that with the increase in the pollutant concentration, the Atterberg limits of the samples decreased, the maximum dry unit weight increased, the optimum moisture content and the unconfined compressive strength of the samples decreased. On the contrary, the results of the tests conducted on the contaminated samples stabilized with zero-valent iron nanoparticles indicated that the unconfined strength of the contaminated samples stabilized with zero-valent iron nanoparticles was increased compared to the contaminated samples without any stabilizer. The results of the unconfined compression tests showed that the uniaxial stress of the samples with iron nanoparticles increased by 45.6, 63, 67.1, and 67.7%, respectively, compared to the same samples contaminated with cadmium without iron nanoparticles.

کلیدواژه‌ها [English]

  • Soil contamination
  • Cadmium
  • Zero valent iron nanoparticles
  • Soil stabilization

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نشریه مهندسی عمران امیرکبیر
دوره 55، شماره 12
اسفند 1402
صفحه 2343-2364

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