Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 32, No. 3 (March 2019) 354-359   

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  A NEW APPROACH TO PROVIDE HIGH WATER PERMEABLE POLYETHERSULFONE BASED NANOFILTRATION MEMBRANE BY AIR PLASMA TREATMENT
 
B. Farokhi, M. Rezaei, Z. Kiamehr and S. M. Hosseini
 
( Received: December 04, 2018 – Accepted in Revised Form: March 07, 2019 )
 
 

Abstract    In this study, polyethersulfone based nanofiltration membranes were modified by air plasma generated through dielectric barrier discharge to increase the membrane hydrophilicity aiming to improve the separation and antifouling characteristics. The effect of plasma time on the physico-chemical and separation properties of membrane was investigated. The PES nanofiltration membranes were fabricated by the solution casting technique associated with phase inversion method. The FTIR spectra showed formation of imine and amine functional groups on the membrane surface. The water contact angle decreased form 58 ° to 31 ° by plasma treatment which produces more hydrophilic surface. SEM and SOM images demonstrated that the surface morphology was changed due to ions collision with membrane surface bombardment. AFM results indicated that membrane roughness was initially enhanced by plasma treatment up to 1 minute, and then decreased again by a further increase of treatment time. Membrane water flux increased from 10.05 (L/m2.h) to 35.17 (L/m2.h) remarkably by plasma treatment up to 1 minute and then decreased again at longer treatment times. An opposite trend was observed for the salt rejection of membranes. The water flux was enhanced ~270% for the modified membrane at 2 min plasma treatment whereas rejection declined less than 18%.

 

Keywords    Surface Modification; High Water Flux; Nanofiltration Membrane; Plasma Treatment; Physico-chemical Property

 

چکیده   

در اين پژوهش غشاهای نانو فيلتراسيون بر پايه پلي اتر سولفون با استفاده از پلاسمای هوا از طريق تخلیه سد دی ‌الکتریک و به منظور بهبود خاصيت آبدوستي غشا، خواص جداسازی و ضدگرفتگي مورد اصلاح قرار گرفت. اثر پلاسما بر خواص شيمي-فيزيکي و جداسازی غشاها مورد بررسي قرار گرفت. غشاها با استفاده از تکنيک قالب گيری محلول پليمری و تغيير فاز تهيه شد. نتايج طيف سنجي مادون قرمز تشکيل گروه های عاملي آمين و ايمين را بر سطح غشاها تاييد کرد. زاويه تماس آب در اثر اصلاح پلاسمايي از 58 تا 31 درجه کاهش يافت که نشان از بهبود آبدوستي سطحي غشاها بود. تصاوير ميکروسکوپ الکتروني و نوری تهيه شده از سطح غشاها نشان مي دهد که ساختار سطحي انها در اثر برخورد يونها تغييرات آشکاری داشته است. نتايج آناليز ميکروسکوپ اتمي حاکي از آن است که در ابتدا زبری سطح غشاها در اثر درمان پلاسمايي تا 1 دقيقه افزايش داشته و سپس با افزايش بيشتر زمان درمان پلاسمايي مجددا کاهش يافته است. همچنين ميزان فلاکس آب غشاها در ابتدا در اثر استفاده از درمان پلاسمايي تا 1 دقيقه از 05/10 (L/m2.h) تا 17/35 (L/m2.h) افزايش داشته و در ادامه با افزايش بيشتر ميزان زمان درمان پلاسمايي کاهش مي يابد. رفتار متفاوتي برای پس دهي ميزان نمک با درمان پلاسمايي مشاهده شد. در غشايي که به ميزان 2 دقيقه تحت درمان پلاسمايي قرار گرفته بود فلاکس آب به ميزان 270 درصد افزايش يافت درحاليکه ميزان پس دهي تنها 18 درصد کاهش داشت.

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