کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10223412 | 1701028 | 2019 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Formation of lead ferrites for immobilizing hazardous lead into iron-rich ceramic matrix
ترجمه فارسی عنوان
تشکیل فرایندهای سرب برای جایگزینی سرب خطرناک به ماتریس سرامیکی غنی از آهن
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کلمات کلیدی
رهبری، پایدارسازی، فریت سرب، مکانیسم، تحولات کریستال،
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم محیط زیست
شیمی زیست محیطی
چکیده انگلیسی
A strategy of immobilizing lead in the framework of ferrite-ceramic matrix, to reduce its environmental hazard was explored in this study. The mechanisms of incorporating lead into lead ferrites (δ-phase (2PbO·Fe2O3), γ-phase (PbO·(2-2.5)Fe2O3) and β-phase (PbO·(5-6)Fe2O3)) was revealed by observing the phase transformation in the products. The δ-phase was dominantly formed at low temperature of 700-800â¯Â°C at Pb/Fe of 1/1-1/3. The significant growth of γ-phase was observed at 750-850â¯Â°C and Pb/Fe of 1/4-1/7. The β-phase substantially formed at 900-1000â¯Â°C with Pb/Fe of 1/7-1/12. The transformation of δ-phase to γ-phase and/or β-phase indicated the destruction of δ-phase unit and reconstruction of γ-phase and β-phase units during sintering process. However, the transformation of γ-phase into β-phase suggested a structure conversion process, local structural changes arose as a consequence of the addition of Fe2O3. When comparing the leaching ability of δ-, γ- and β-phase, the results showed the superiority of β-phase for lead immobilization over the longer leaching period.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 214, January 2019, Pages 239-249
Journal: Chemosphere - Volume 214, January 2019, Pages 239-249
نویسندگان
Xingwen Lu, Jiani Yang, Xun-an Ning, Kaimin Shih, Fei Wang, Yuanqing Chao,