کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6467502 1423258 2017 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Aldehyde functionalized graphene oxide frameworks as robust membrane materials for pervaporative alcohol dehydration
ترجمه فارسی عنوان
آلدهید چارچوب اکسید گرافین را به عنوان مواد غشایی قوی برای کمبود آب آلرژی فراوان
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


- Three aldehyde functionalized GOF membranes have been molecularly designed.
- The resultant GOF membranes displayed adjustable microstructures.
- GOF membranes exhibited greatly improved alcohol dehydration performance.
- Excellent long term stability was found for the GOF membranes within 160-200 h.

To glue the graphene oxide (GO) nanosheets more firmly and to fabricate more stable GO membranes for long-term applications, three types of graphene oxide framework (GOF) membranes have been molecularly constructed via the aldehyde-functionalization of GO and a pressure assisted ultrafiltration method. The resultant GOF membranes not only possess GO/aldehyde covalent bonds but also display adjustable microstructural properties, confirmed by FTIR, XPS, XRD and positron annihilation spectroscopy (PAS). All aldehyde modified GOF membranes exhibited much improved separation performance for ethanol dehydration via pervaporation, as compared with the pristine GO membrane. The GOF membranes were also tested for the dehydration of ethanol, isopropanol, and n-butanol at different feed temperatures. Excellent separation performance at 60 °C for n-butanol dehydration was obtained with a high flux of 2593 g m−2 h−1 and the water concentration in permeate of 99.7 wt%. Importantly, the pervaporation stability of GOF membranes at a relatively high temperature was investigated for the first time. The membranes performed well for the dehydration of alcohols at 60 °C within a long period of 160-200 h.

Graphene oxide framework (GOF) membranes functionalized by three different aldehydes show adjustable microstructures, improved separation performance and good stability.201

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Science - Volume 161, 6 April 2017, Pages 341-349
نویسندگان
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