تبدیل فوتوکاتالیستی آلاینده سمی و فراوان H2S به سوخت پاک هیدروژن و عنصر مفید گوگرد با استفاده از انرژی ماده نانوساختار منگنز سولفید

نوع مقاله: مقاله پژوهشی

نویسندگان

دانشکده شیمی، دانشگاه تحصیلات تکمیلی علوم پایه زنجان، ایران

10.22078/pr.2019.3635.2660

چکیده

در کار حاضر، نیم‌رسانای نانو‌ساختار/ مزو‌متخلخل نوع p پایدار و ارزان قیمت منگنز سولفید به‌روش هیدروترمال سنتز و در فرآیند تبدیل فوتوکاتالیستی محلول قلیایی حاوی H2S برای تولید هیدروژن و سولفور در دما و فشار محیط مورد استفاده قرار گرفت. آزمایش‌های پراش پرتو ایکس (XRD)، میکروسکوپ الکترونی روبشی میدان‌گسیل و عبوری (FESEM ،TEM) و همدمای جذب- واجذب (BET)، نانوساختار بودن انرژی ماده سنتز شده را تأیید نمودند. همچنین، با استفاده از داده‌های مطالعات طیف‌سنجی بازتاب نفوذی فرابنفش- مرئی (DRS؛ کوبلکا- مونک) و امپدانس الکتروشیمیایی (نمودار مات- شاتکی)، انرژی شکاف نواری و پتانسیل‌های نوار مسطح، ظرفیت و هدایت برای این ماده نیم‌رسانا تعیین گردید. مطالعات نورکاتالیستی نشان دادند ترکیب سنتزی از توانایی خوبی برای تولید سوخت هیدروژن و عنصر گوگرد برخوردار است (بازده کوانتومی: 12%، اندازه‌گیری شده در nm 434). همچنین، بعد از h 3 کار واکنش گاه حاوی g 2/0 نورکاتالیست، مقدار گاز هیدروژن آزاد شده و محصول گوگرد به ترتیب µmol 1350 و mgr 42 به‌دست آمد.
 

کلیدواژه‌ها


عنوان مقاله [English]

Photocatalytic Transformation of H2S Plentiful-Perilous Pollutant to Hydrogen Clean Fuel and Sulfur Element Using MnS Nanostructured Energy-Material

نویسندگان [English]

  • Majid Ghanimati
  • Mohsen Lashgari
Department of Chemistry, Institute of Advanced Studies in Basic Sciences (IASBS), Zanjan, Iran
چکیده [English]

In this work, a nanostructured/mesoporous p-type, low-price, stable mangranese sulfide semiconductor was synthesized and employed under ambient temperature and pressure conditions, to produce hydrogren and sulfur through photocatalytic transformation of an H2S-containing alkaline solution. X-ray diffraction (XRD), field emission scanning and transmission electron microscopy (FESEM, TEM), and adsorption-desorption isotherm (BET) analyses proved a nanostructured morphologry for the synthesized energry material. Moreover, usingr diffuse reflectance UV-vis. spectroscopic (DRS) and electrochemical impedance data (Mott-Schottky diagram), bandgap energy and flat-band as well as valence and conduction bands’ potentials were determined for this semiconductor material. Photocatalytic investigations revealed a good potency for the synthesized material to produce hydrogen fuel and sulfur element [quantum yield: 12% measured at 434 nm]. Furthermore, after 3- hours operation of the reactor containing 0.2 g photocatalyst, the extent of hydrogen gas and sulfur product were obtained 1350 µmol and 42 mgr, respectively.
 

کلیدواژه‌ها [English]

  • H2S photocatalytic degradation
  • Hydrogen Fuel
  • Nanostructured sulfide semiconductor
  • Sulfur production
  • Pollutant elimination
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