نوع مقاله : یادداشت فنی
نویسندگان
1 پژوهشکده علوم محیطی، دانشگاه شهید بهشتی
2 دانشکده ی شیمی، دانشگاه خوارزمی
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
In the present study, a mixed matrix nanofiltration membrane was prepared by
blending magnetic $Fe_3O_4$ and amino-functionalized $Fe_3O_4$
($Fe_3O_4$-APTES) nanoparticles into polyethersulfone (PES) matrix. To achieve this purpose, $Fe_3O_4$ and $Fe_3O_4$-APTES nanoparticles were introduced into PES matrix using phase inversion technique. Scanning electron microscopy (SEM), water contact angle and overall porosity technique were used to investigate the effect of $Fe_3O_4$ and $Fe_3O_4$-APTES nanoparticles on membrane morphology and hydrophilicity. The effect of $Fe_3O_4$ and $Fe_3O_4$-APTES nanoparticles on membrane performance was studied in terms of pure water flux, antifouling properties. Nanofiltration performance of
the membranes was examined using reactive green 19 (RG19) separation. The
$Fe_3O_4$
and $Fe_{3}O_{4}$-APTES modified membranes showed an increased hydrophilicity, porosity, permeability, and dye rejection efficiency and also improved antifouling properties, compared to the bare PES. Water contact angle result demonstrated a decreasing trend with addition of $Fe_{3}O_{4}$ and
$Fe_{3}O_{4}$-APTES content, showed the effect of hydrophilic nanoparticles on membrane surface hydrophilicity. Membrane porosity was increased from 63.3%
for the bare PES to 73.3% and 78.0% for the $Fe_{3}O_{4}$-0.50 and $Fe_{3}O_{4}$-APTES respectively, due to the presence of nanoparticles. Pure water flux was increased from 36.1 to 80.4 ($L/m^2$ h) by increasing the $Fe_{3}O_{4}$ nanoparticle content from 0.00 to 0.50 wt.% and then increased to 92.9 ($L/m^2$ h) by addition of the $Fe_{3}O_{4}$-APTES nanoparticle. Fouling resistance of the prepared membranes was investigated with filtration of a 250 mg/L bovine serum albumin (BSA) solution. All modified membranes showed improved antifouling properties compared to the bare PES. The best antifouling properties were observed for the $Fe_{3}O_{4}$-APTES membrane. The values of total, reversible and irreversible fouling for the bare PES were 54.0, 12.6, and 41.4% respectively. Whereas these values for the $Fe_{3}O_{4}$-0.50 were 31.9, 12.8, and 19.1% respectively, and 26.8, 10.3, and 16.5% for the $Fe_{3}O_{4}$-APTES, showed higher fouling resistance of the $Fe_{3}O_{4}$ and $Fe_{3}O_{4}$-APTES
modified membranes due to the more hydrophilic surface. Flux recovery ratio
(FRR) was measured as the most important fouling factor. The value of FRR was
increased from 58.6% for the bare PES to 80.9 and 83.5% for the $Fe_3O_4$-0.50 and $Fe_3O_4$-APTES, respectively. Dye rejection performance for all prepared
membranes was near total removal (more than 95%). The maximum and the minimum removal efficiency were observed for $Fe_3O_4$-APTES (99.5%) and bare PES (95.4%), respectively. the results introduced $Fe_3O_4$ and $Fe_3O_4$-APTES nanoparticles as an excellent membrane modifier for wastewater treatment objectives.
کلیدواژهها [English]
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