کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4486601 1316994 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Water disinfection using photosensitizers immobilized on chitosan
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Water disinfection using photosensitizers immobilized on chitosan
چکیده انگلیسی

We have designed experiments to test the idea that the photodynamic effect can be used to lower microbial levels in a flow of water using a sensitizer incorporated into a polymeric membrane. We have selected a naturally derived, wettable polymer, chitosan, which can be reinforced with nylon. Photosensitizers of singlet oxygen formation were incorporated into translucent chitosan membranes by adsorption [5,10,15,20-tetrakis(p-hydroxyphenyl)porphyrin, p-THPP], by dissolution and casting [5,10,15,20-tetrakis(p-aminophenyl)porphyrin, p-TAPP], and by covalent attachment by reactive dyeing [zinc(II) phthalocyanine tetrasulfonic acid, ZnPcS]. Preliminary evaluation of photomicrobicidal activity in static systems against Escherichia coli revealed some activity in each case, and showed that the phthalocyanine/chitosan membrane was the most effective. A novel photodisinfection reactor was designed and constructed as a model for a large-scale water-flow system. Using the novel reinforced ZnPcS/chitosan membrane as the photosensitizing surface, a significant photokill of E. coli was observed, thus providing proof of concept.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Water Research - Volume 40, Issue 6, March 2006, Pages 1269–1275
نویسندگان
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