کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6970343 1453044 2016 29 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Salisbury biochar did not affect the mobility or speciation of lead in kaolin in a short-term laboratory study
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
Salisbury biochar did not affect the mobility or speciation of lead in kaolin in a short-term laboratory study
چکیده انگلیسی
Salisbury biochar (produced from British broadleaf hardwood) with two different particle sizes (≤2 mm and ≤0.15 mm) was applied on a kaolin with three different lead (Pb2+) contamination levels (50 mg/kg, 300 mg/kg and 1000 mg/kg) at the dosage of 1% in w/w. The short-term impact of biochar on the mobility and speciation of Pb2+ in the kaolin was investigated using attenuation periods of 1, 7 and 28 days. The leachability and extractability of Pb2+ in carbonic acid leaching and EDTA extraction tests as well as the speciation of Pb2+ in soils were not significantly affected by biochar treatment during all periods. The insignificant effects of biochar on Pb2+ immobilisation were most likely attributed to the high adsorption capacity of Pb2+ on the kaolin and biochar failed to competitively adsorb Pb2+ against kaolin. The kaolin immobilised Pb2+ primarily through cation exchange, which represents the readily bioavailable fractions of Pb2+ in soils and may still pose environmental risks. This paper suggests the inefficiency of biochar treament on heavy-metal contaminated clay-rich soils. Therefore a laboratory treatablity study with respect to the soil type may be crucial when large-scale biochar applications in heavy-metal associated soil remediation are evaluated.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 316, 5 October 2016, Pages 214-220
نویسندگان
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