کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
56780 47095 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
On the virtue of acid–base titrations for the determination of basic sites in nitrogen doped carbon nanotubes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
On the virtue of acid–base titrations for the determination of basic sites in nitrogen doped carbon nanotubes
چکیده انگلیسی

The basicity and nature of basic species in nitrogen containing carbon nanotubes (NCNT) prepared under different conditions were investigated by acid–base titrations. Proton uptake curves were derived from the titration data and were used to establish the basicity (pKa) ranges of nitrogen species present in NCNT. Based on the evolution of the titration curves upon acid addition the NCNT were divided into three classes: (I) in which pyridinic type N with a pKa of 7–9 were predominantly present; these pyridinic groups had some buffering capacity in a pH range of 5–7; (II) where amine type N with a pKa of 7–9 were the major species; these groups showed only minor buffering capacity at pH 8–9; (III) NCNT with low basicity, i.e. most groups possessed a pKa < 7 with insignificant buffering capacity. All NCNT could be regarded as being composed of organic nitrogen containing building blocks having different pKa values.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Today - Volume 150, Issues 1–2, 26 February 2010, Pages 61–66
نویسندگان
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