بررسی اثر پیش‌ماده‌های مختلف در سنتز و بهبود عملکرد کاتالیزور نوری کربن نیترید گرافیتی در تخریب ماده رنگزای رودامین بی توسط نور مرئی

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه فناوری‌های محیط‌زیست، پژوهشکده علوم محیطی، دانشگاه شهید بهشتی، تهران، ایران، کدپستی:1983969411

10.30509/jcst.2024.167291.1224

چکیده

فرایند­های کاتالیزور نوری با استفاده از انرژی خورشید، در زمره روش­های تصفیه شیمیایی نوین در تصفیه آلاینده­های آلی رنگی می­باشد که در حال حاضر توجه بسیاری را به خود جلب نموده است. کاتالیزور نوری کربن نیترید گرافیتی (g-C3N4) با استفاده از روش بسپارش حرارتی و با بهره‌گیری (تکی و یا ترکیبی) از پیش‌ماده‌های ملامین، تیوره و کلرید آمونیم سنتز شد. کاتالیزورهای نوری سنتز شده برپایه g-C3N4  برای بررسی ساختار، ریخت‌شناسی و خواص آن­ها با استفاده از آنالیز­های XRD، FT-IR، SEM، EDX، BET، PL، و DRS مورد بررسی قرار گرفتند و به منظور تخریب ماده رنگزای کاتیونی رودامین بی (RhB) استفاده شدند. نتایج آزمایشات نشان داد که کربن نیترید گرافیتی سنتز شده با پیش‌ماده ترکیبی ملامین، تیوره و کلرید آمونیم (MTA) با دوز 0.2 گرم بر لیتر و غلظت ماده رنگزای 50 میلی‌گرم ‌بر لیتر بیشترین عملکرد را بر تخریب RhB داشته و در بازه زمانی120 دقیقه (2 ساعت) سبب رنگ‌زدایی 100 درصدی از محلول رنگزا شد. همچنین کارایی کاتالیزوری نوری MTA در تخریب ماده رنگزای RhB در پنج چرخه متوالی تقریباً ثابت بوده است. علاوه بر این، طبق نتایج آزمایشات به دام انداختن گونه­های فعال رادیکال سوپر اکسید (•O2-) گونه غالب برای فرآیند تخریب RhB بود. از این رو، MTA  را می­توان به دلیل مزایایی مانند سنتز یک مرحله­ای، عملکرد کاتالیزور نوری موثر و قابلیت استفاده مجدد، یک کاتالیزور کارآمد در نظر گرفت.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating the Effect of Various Precursors in the Synthesis and Improvement of the Photocatalytic Performance of Graphite Carbon Nitride in the Degradation of Rhodamine B Dye Under Visible Light

نویسندگان [English]

  • Sarina Dousti
  • Bahaaddin Mahmoodi
  • Mehran Bijari
  • Afsaneh Shahbazi
Environmental Sciences Research Institute, Shahid Beheshti University, P.O. Code: 1983969411, Tehran, Iran
چکیده [English]

Photocatalytic processes using solar energy are one of the new chemical purification methods in the purification of colored organic pollutants, attracting much attention. Graphite carbon nitride photocatalyst (g-C3N4) was synthesized using the thermal polymerization method and using (single or combined) melamine, thiourea, and ammonium chloride precursors. Synthesized photocatalysts based on g-C3N4 were analyzed to investigate their structure, morphology, and properties using XRD, FT-IR, SEM, EDX, BET, PL, and DRS analyses and to degrade the cationic dye Rhodamine B (RhB) used. The results of the experiments showed that the graphite carbon nitride synthesized with the combined precursor of melamine, thiourea, and ammonium chloride (MTA) with a dose of 0.2 g/l and a color concentration of 50 mg/l has the highest performance on the degradation of RhB color and after 2 hours, caused 100% decolorization of the dye solution. Also, the photocatalytic efficiency of MTA in the degradation of RhB dye was almost constant in five consecutive cycles. In addition, according to the results of the trapping experiments, the active species of superoxide radical (•O2-) was the dominant species for the degradation process of RhB. Hence, MTA can be considered an efficient catalyst due to its advantages, such as one-step synthesis, effective photocatalytic performance, and reusability.

کلیدواژه‌ها [English]

  • Photocatalytic process
  • Graphite carbon nitride
  • Rhodamine B
  • Decolorization

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