کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4481140 1623091 2015 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Graphene oxide based ultrafiltration membranes for photocatalytic degradation of organic pollutants in salty water
ترجمه فارسی عنوان
غشاهای اولترافیلتراسیون مبتنی بر اکسید گرافن برای تخریب فتوکاتالیتی آلاینده های آلی در آب شور
کلمات کلیدی
اکسید گرافن، غشای فوتوکاتالیستی، فیلتر کردن، تصفیه آب، آب شور، ضد زلزله
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی


• Ultrafiltration membranes prepared with different photocatalysts.
• Degradation of organic pollutants in simulated brackish water and seawater.
• High catalytic activity and permeate flux with a graphene oxide-TiO2 membrane.
• Hierarchically ordered membrane prepared by intercalating a graphene oxide layer.
• The presence of NaCl has little effect on the catalytic stability of the membranes.

Flat sheet ultrafiltration (UF) membranes with photocatalytic properties were prepared with lab-made TiO2 and graphene oxide-TiO2 (GOT), and also with a reference TiO2 photocatalyst from Evonik (P25). These membranes were tested in continuous operation mode for the degradation and mineralization of a pharmaceutical compound, diphenhydramine (DP), and an organic dye, methyl orange (MO), under both near-UV/Vis and visible light irradiation. The effect of NaCl was investigated considering simulated brackish water (NaCl 0.5 g L−1) and simulated seawater (NaCl 35 g L−1). The results indicated that the membranes prepared with the GOT composite (M-GOT) exhibited the highest photocatalytic activity, outperforming those prepared with bare TiO2 (M−TiO2) and P25 (M-P25), both inactive under visible light illumination. The best performance of M-GOT may be due to the lower band-gap energy (2.9 eV) of GOT. In general, the permeate flux was also higher for M-GOT probably due to a combined effect of its highest photocatalytic activity, highest hydrophilicity (contact angles of 11°, 17° and 18° for M-GOT, M−TiO2 and M-P25, respectively) and higher porosity (71%). The presence of NaCl had a detrimental effect on the efficiency of the membranes, since chloride anions can act as hole and hydroxyl radical scavengers, but it did not affect the catalytic stability of these membranes. A hierarchically ordered membrane was also prepared by intercalating a freestanding GO membrane in the structure of the M-GOT membrane (M-GO/GOT). The results showed considerably higher pollutant removal in darkness and good photocatalytic activity under near-UV/Vis and visible light irradiation in continuous mode experiments.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Water Research - Volume 77, 15 June 2015, Pages 179–190
نویسندگان
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