شیمى کاربردى روز

شیمى کاربردى روز

سنتز هدفمند فوتوکاتالیست نانوکامپوزیتی جاذب برای تبدیل گاز خطرناک H2S به سوخت پاک

نوع مقاله : مقاله علمی پژوهشی

نویسندگان
1 گروه شیمی‌فیزیک، دانشکده شیمی، دانشگاه تحصیلات تکمیلی علوم پایه زنجان، زنجان، صندوق پستی 66731-45137 ایران
2 دانشکده علوم شیمیایی، دانشگاه ناپلس فدریکو (II)، ناپولی، ایتالیا
3 مرکز ملی علوم مواد، ژاپن
چکیده
هیدروژن سولفید، معضل اصلی صنایع نفت و گاز ترش، یک گاز خورنده و فوق‌العاده سمی است که در مقیاس وسیع در این صنایع تولید می‌شود. تخریب فوتوکاتالیستی H2S با هدف تولید سوخت، یک رویکرد جدید و پایدار برای رفع مشکل، تامین سوخت پاک هیدروژن و حذف این آلاینده‌ی خطرناک زیست‌محیطی است. در این راهبرد سبز مبتنی بر فوتون، طراحی هدفمند و سنتز آسان انرژی‌مواد نیم‌رسانا از دیدگاه کاربردی حائز اهمیت است. در این پژوهش، بدون مصرف نمودن کاهنده‌ی شیمیایی خارجی، نانوکامپوزیت جاذب rGO/CoMn2O4 به روش هیدروترمال و بصورت تک مرحله‌ای سنتز و برای تولید موثر گاز هیدروژن از طریق شکافت فوتوکاتالیستی محلول قلیایی H2S استفاده شد. آنالیزهای XRD، FTIR و رامان نشان داد گرافین اکسید بدون نیاز به افزودن کاهنده حین فرایند هیدروترمال کاهش می‌یابد. بررسی‌های میکروسکوپ الکترونی عبوری با وضوح بالا (HRTEM) برقراری اتصال بین ذرات سازنده کامپوزیت را مورد تایید قرار داد. مطالعات جذب بی‌سولفید مشخص نمود فوتوکاتالیست نانوکامپوزیتی از ظرفیت بالای جذب واکنشگر (97/13 درصد وزنی) برخوردار است. آنالیزهای BET، طیف‌سنجی فرابنفش-مرئی و PL نشان داد حضور rGO در نانوکامپوزیت، سطح فوتوکاتالیست را افزایش داده و با تقویت جذب فوتون و کاهش بازترکیب الکترون-حفره، هیدروژن بیشتری تولید می‌شود. سرعت آزادسازی هیدروژن 5217 میکرومول بر ساعت بر گرم فوتوکاتالیست بدست آمد که بیانگر عملکرد خوب فوتوکاتالیست نانوکامپوزیتی برای حذف آلاینده و تولید سوخت است.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Targeted Synthesis of Adsorptive Nanocomposite Photocatalyst for Conversion of Dangerous H2S Gas to Clean Fuel

نویسندگان English

Majid Ghanimati 1
Mohsen Lashgari 1
Fabio Montagnaro 2
Marco Balsamo 2
Masaki Takeguchi 3
1 Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran
2 Department of Chemical Sciences, University of Naples “Federico II”, Complesso Universitario di Monte Sant’Angelo, 80126 Naples, Italy
3 National Institute for Materials Science, Japan
چکیده English

Hydrogen sulfide (H2S), a major issue in the sour oil and gas industries, is a highly corrosive and toxic gas produced on a large scale in these industries. Photocatalytic degradation of H2S with the aim of producing fuel is a novel and sustainable approach to solving the problem, supplying clean hydrogen fuel and eliminating this dangerous environmental pollutant. In this photon-based green strategy, the targeted design and easy synthesis of semiconducting energy materials are crucial from an applied standpoint. In this research, without consuming an external reducing agent, the adsorbing rGO/CoMn₂O₄ nanocomposite was synthesized through a one-pot hydrothermal route and employed to effectively produce hydrogen gas via photocatalytic splitting of an alkaline H₂S solution. XRD, FTIR, and Raman analyses showed that graphene oxide (GO) is reduced during the hydrothermal process without the need for a reducing additive. High-resolution transmission electron microscopy (HRTEM) investigations confirmed the attachment of the constituent particles of the composite. Bisulfide sorption studies revealed that the nanocomposite photocatalyst has a high capacity for adsorbing the reactant species (13.97 wt.%). BET, UV-Vis, and PL spectroscopic analyses showed that the presence of rGO in the nanocomposite increases the surface area of the photocatalyst, and by enhancing photon absorption and reducing electron-hole recombination, more hydrogen is generated. The rate of hydrogen release was 5217 (μmol H_2)/(g_cat.h), indicating the good performance of the synthesized nanocomposite photocatalyst for pollutant removal and conversion into clean fuel.

کلیدواژه‌ها English

Hydrogen sulfide
Adsorptive photocatalyst
Hydrogen production
Semiconducting nanocomposite
Hydrothermal reduction
Cobalt manganite
Reduced graphene oxide
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