کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9588626 | 1506645 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A molecular approach to remove lead from drinking water
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Corrosion of lead-containing plumbings is responsible for significant contamination of tap water, which can reach several hundreds of micrograms per liter. According to a decision of the European Council applicable in 2013, the maximal lead level in tap water should not exceed 10 μg lâ1. A new concept has been explored that relies on solid-phase extraction by covalent attachment of a lead-selective macrocyclic sequestering agent onto the surface of silica gel. An N-carbamoylmethyl substituted 1,4,8,11-tetraazacyclotetradecane (cyclam) derivative was shown to exhibit favorable protonation properties together with an almost 106-fold selectivity for lead over calcium. Structural studies evidenced the formation of an octadentate molecular cage around the encapsulated Pb2+ cation. Extensive simulations of lead speciation diagrams further indicated that the selected tetraacetamide cyclam ligand was able to successfully compete in a large pH and alkalinity range with complexing anions usually present in tap water to uptake the target metal. Materials were prepared by grafting closely related derivatives onto silica gel and their lead fixation efficiency was investigated in various flow tests using a packed column. Breakthrough and regeneration experiments at low flow rate confirmed the predicted efficiency. In order to validate the concept of a domestic cartridge-based purification system that could be mounted directly on a kitchen faucet, the performance of the extracting material was finally evaluated on a pilot system that incorporates a lead-pipe loop. Effective decontamination could be achieved for conditions simulating real applications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Liquids - Volume 118, Issues 1â3, 15 April 2005, Pages 89-99
Journal: Journal of Molecular Liquids - Volume 118, Issues 1â3, 15 April 2005, Pages 89-99
نویسندگان
François Cuenot, Michel Meyer, Arnaud Bucaille, Roger Guilard,