حذف رنگ RG19 و RR198 با استفاده از غشاء PES اصلاح شده با نانوفیلرهای گرافن‌اکسایدی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 عضو هیات علمی دانشگاه شهید بهشتی

2 1. دانشجوی کارشناسی ارشد رشته آلودگی محیط زیست، پژوهشکده علوم محیطی، دانشگاه شهید بهشتی، تهران

3 پژوهشکده علوم محیطی، دانشگاه شهید بهشتی

چکیده

رنگ‌های راکتیو جزء رنگ‌های محلول در آب هستند. مقدار زیادی یون هیدروکسید (OH )-وارد محیط کرده و سبب تغییر رنگ و pH می‌شوند. این رنگ‌ها سبب ایجاد مشکلاتی برای انسان و گیاهان و جانوران ساکن در محیط می‌شوند. بنابراین حذف رنگ‌های مذکور از محیط آبی امری ضروری است. در پژوهش حاضر ابتدا نانوصفحات گرافن‌اکساید با استفاده از روش اصلاح شده‌ی هامر سنتز گردید و گرافن اکساید مغناطیسی با روش سولوترمال تهیه شد. ویژگی نانوفیلرها با استفاده از آنالیزهای XRD، SEM و VSM بررسی شد. غشاء PES با استفاده از نانوفیلرهای GOو mGO طی فرآیند جدایش فاز ساخته و مورفولوژی سطح و آبدوستی غشاء با استفاده از آنالیزهای SEM ،تخلخل و زاویه تماس بررسی شد. پس از اندازه‌گیری شار و خواص ضدگرفتگی غشاء، میزان حذف رنگ‌های RG19 و RR198 توسط غشاء بررسی شد. نتایج نشان داد که خاصیت آب‌دوستی در همه غشاءهای اصلاح شده نسبت به غشاء خالص بهبود یافته. غشاء mGO-PES آب‌دوستی بیشتری نسبت به غشاء GO-PES دارد؛ غشاء حاوی mGO-PES زاویه تماس آب،4/07 درجه نسبت به غشاء GO-PES کاهش یافت. تخلخل غشاء mGO-PES نسبت به GO-PES بیشتر بوده و میزان شار غشاء m/L h، mGO-PES^3/032 نسبت به غشاء GO-PES بیشتر شد. بازیابی شار غشاء mGO-PES به مقدار %5/7 از غشاء GO-PES بیشتر شد. کارایی غشاء mGO-PES در مقابل حذف رنگ RG19 و RR198 به تربیب %1 و 4 %بیشتر از غشاء GO-PES شد. با توجه به نتایج می‌توان گفت که نانوفیلر گرافن‌اکساید مغناطیسی کارایی بهتری در اصلاح غشاء و حذف رنگ از محلول آبی دارد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

RR198 and RG19 Dye Removal by using PES membrane modified with graphene oxide nanofillers

نویسندگان [English]

  • afsaneh shahbazi 1
  • Mahdieh Aghaei 2
  • Habib Koulivand 3
1 Prof., Environmental Sciences Research Institute, Shahid Beheshti University, G.C., Tehran, Iran
2 MSc Studentd, Environmental Science Research Institute, Shahid Beheshti University, Tehran 1983969411
3 Environmental science research institute, Shahid beheshti university
چکیده [English]

The presence of the even very low concentration of dyes makes it undesirable due to its appearance. Most of the organic dyes have aromatic rings in their structure that, make them very toxic and non-biodegradable. So removal of this dyes from industrial effluents before discharging in natural waters is very important. In the present study, Graphene-oxide (GO) nano-sheets were first synthesized using the modified Hammer method and then magnetic graphene oxide (mGO) was prepared using a solvothermal method. The properties of nanofillers were investigated using SEM, XRD and VSM analyzes. The synthesized GO and mGO were embedded in the matrix of polyethersulfone (PES) using phase inversion technique in order to improve its hydrophilicity, permeability, antifouling properties, and rejection performance. Surface and cross-sectional morphology of the resulted bare and nanocomposite membranes were characterized by SEM images. The effect of blended nanoparticles on membrane hydrophilicity and performance were determined using water contact angle, pure water flux, BSA solution filtration, and Reactive Green 19 (RG19) and Reactive Red 198 (RR198) dye solution rejection. Cross-sectional SEM images of the prepared membranes presented an asymmetric structure with a finger like porous sub-layer and dense top-layer. The water contact angle for the bare PES, PES-GO 0.25 wt%, and PES-mGO 0.25wt% were 61.17°, 55.11°, and 51.04°, respectively. The pure water flux of the blended PES membranes was enhanced significantly compared to the bare PES due to the higher hydrophilicity. The results of antifouling properties using BSA filtration demonstrated that the PES-mGO 0.25wt% had the best antifouling properties. Values of flux recovery ratio for the bare PES, PES-GO 0.25 wt%, and PES-mGO 0.25wt% were 45.0, 67.0, and 72.7%, respectively. Dye rejection performance also was increased for the PES-GO 0.25 wt% and PES-mGO 0.25wt% compared to the bare PES. . Compared to the all fabricated membranes, PES-mGO 0.25wt% showed the highest hydrophilicity, permeability, rejection, and antifouling properties.

کلیدواژه‌ها [English]

  • Dye removal
  • Magnetic Graphene oxide
  • Nanofiltration
  • Reactive Red 198
  • Reactive Green 19
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