کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6308461 | 1618854 | 2014 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermochemical reaction mechanism of lead oxide with poly(vinyl chloride) in waste thermal treatment
ترجمه فارسی عنوان
مکانیزم واکنش ترمو شیمیایی اکسید سرب با پلی (وینیل کلرید) در درمان حرارتی ضایعات
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کلمات کلیدی
رهبری، کلرید پلی وینیل)، عملیات حرارتی، مکانیسم واکنش نوسان
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم محیط زیست
شیمی زیست محیطی
چکیده انگلیسی
Poly(vinyl chloride) (PVC) as a widely used plastic that can promote the volatilization of heavy metals during the thermal treatment of solid waste, thus leading to environmental problems of heavy metal contamination. In this study, thermogravimetric analysis (TGA) coupled with differential scanning calorimeter, TGA coupled with Fourier transform infrared spectroscopy and lab-scale tube furnace experiments were carried out with standard PVC and PbO to explicate the thermochemical reaction mechanism of PVC with semi-volatile lead. The results showed that PVC lost weight from 225 to 230 °C under both air and nitrogen with an endothermic peak, and HCl and benzene release were also detected. When PbO was present, HCl that decomposed from PVC instantly reacted with PbO via an exothermal gas-solid reaction. The product was solid-state PbCl2 at <501 °C, which was the most volatile lead-containing compound with a low melting point and high vapor pressure. At >501 °C, PbCl2 melted, volatilized and transferred into flue gas or condensed into fly ash. Almost all PbCl2 volatilized above 900 °C, while PbO just started to volatilize slowly at this temperature. Therefore, the chlorination effect of PVC on lead was apt to lower-temperature and rapid. Without oxygen, Pb2O was generated due to the deoxidizing by carbon, with oxygen, the amount of residual Pb in the bottom ash was significantly decreased.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 117, December 2014, Pages 353-359
Journal: Chemosphere - Volume 117, December 2014, Pages 353-359
نویسندگان
Si-Jia Wang, Hua Zhang, Li-Ming Shao, Shu-Meng Liu, Pin-Jing He,