کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4987523 1455272 2017 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Layer-by-layer self-assembly TiO2 and graphene oxide on polyamide reverse osmosis membranes with improved membrane durability
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Layer-by-layer self-assembly TiO2 and graphene oxide on polyamide reverse osmosis membranes with improved membrane durability
چکیده انگلیسی
Improving membrane durability associated with resistance to chlorine and biofouling is critical important for polyamide (PA) reverse osmosis (RO) membrane technology. Here, few-layered TiO2 nanoparticles and graphene oxide (GO) were layer-by-layer self-assembled onto flat PA reverse osmosis membrane surfaces by hydrogen bonding and physical absorption to address this challenge. Contact angle testing proved that the membrane surface hydrophilicity was improved with the increase of bilayers. The modified PA membrane with bilayer number ≤ 6 showed increased water flux. Moreover, XPS results indicated that TiO2 and GO were attached to the membrane surface with good stability in our experimental conditions, and that GO nanoparticles played a part in improving chlorine resistance due to absorbing chlorine radicals. All modified PA membranes showed an anti-fouling effect and had an inhibitory effect on rejection reduction exposed to chlorine solution. For instance, the water flux of pristine membranes varied from 20.3 l/m2 h to 7.5 l/m2 h while the bilayer6-coated membrane dropped from 23.6 to 17.9 l/m2 h after UV light exposure and incubating with microbial cells for 3 d. Meanwhile, for the chlorine resistance, compared with 60% salt rejection of unmodified membrane, the bilayer6-coated membrane was a more effective 75% after 20 h of chlorine exposure.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 423, 1 December 2017, Pages 21-29
نویسندگان
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