سنتز و مشخصه‌یابی جاذبهای TiO2/Ag برای حذف H2S از پسابهای صنعتی

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی مواد، دانشکده فنی مهندسی گلپایگان، دانشگاه صنعتی اصفهان، گلپایگان.

چکیده

در این تحقیق ذرات TiO2/Ag با استفاده از یک روش احیایی بمنظور حذف قابل توجهی از گاز سولفید هیدروژن از پسابهای پالایشگاهی سنتز شد. همچنین ذرات فرآوری شده TiO2/Ag با استفاده از تکنیک‌های مختلفی مانند XRD، SEM، FTIR، UV-Vis و DSC مشخصه‌یابی گردیدند. آنالیز XRD انجام شده موید این واقعیت هستند که مواد سنتز شده دارای شبکه کریستالی تتراگونال بوده و مواد فرآوری شده فاقد هرگونه فازهای دیگر و ناخالصی است. نتایج حاصل از تصاویر SEM نشان داد که اندازه ذرات فرآوری شده TiO2/Ag عمدتا در محدوده تقریبی 120 تا 160 نانومتر بوده و از توزیع یکنواختی برخوردار هستند ضمن آنکه مطابق با نتایج آزمون EDX-Map مشاهده گردید که عناصر مختلف و از جمله نقره با کیفیت مطلوبی در مواد سنتز شده توزیع شده‌اند. آنالیز حرارتی مواد سنتز شده تا دمای 1000 درجه سانتیگراد نشان داد که پیک-های ایجاد شده در دماهای 47 و 310 درجه سانتیگراد به ترتیب مربوط به تبخیر آب سطحی و حذف فازهای آلی بوده و حدود 5/1 درصد از وزن آنها کاهش یافته است. در نهایت آنالیز UV-Vis نشان داد که با بخدمت گیری مواد جاذب سنتز شده میزان عبور نور از پسابها به میزان قابل قبولی افزایش و در واقع تصفیه پسابها تا حدود مناسبی انجام شده است. این پدیده به واکنش میان Ag و H2S موجود در پساب و تشکیل Ag2S نسبت داده می‌شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Synthesis and Characterization of TiO2/Ag Adsorbents for H2S Removal from Industrial Wastewater

نویسندگان [English]

  • Mahdi Soleimani
  • Seyed Mahdi Rafiaei
Materials Engineering Group, Golpayegan College of Engineering, Isfahan University of Technology, Golpayegan, Iran.
چکیده [English]

In this study, TiO2/Ag particles were synthesized using a reduction method for significant removal of hydrogen sulfide gas from refinery wastewater. Also, the processed TiO2/Ag particles were characterized using various techniques such as XRD, SEM, FTIR, UV-Vis and DSC. The XRD analysis confirmed the fact that the synthesized materials have a tetragonal crystal lattice and the processed materials are free of any other phases and impurities. The results of SEM images showed that the size of the processed TiO2/Ag particles was mainly in the range of approximately 120 to 160 nm and had a uniform distribution. In addition, according to the results of the EDX-Map test, it was observed that various elements, including silver, were distributed with desirable quality in the synthesized materials. Thermal analysis of the synthesized materials up to 1000 ֯C showed that the peaks formed at temperatures of 47 and 310 ꞌC were related to the evaporation of surface water and the removal of organic phases, respectively, and about 1.5% of their weight was reduced. Finally, UV-Vis analysis showed that by using the synthesized absorbent materials, the light transmission rate from the wastewater increased to an acceptable level and, in fact, the wastewater was treated to an appropriate extent. This phenomenon is attributed to the reaction between Ag and H2S in the wastewater and the formation of Ag2S.

کلیدواژه‌ها [English]

  • Refinery wastewater
  • hydrogen sulfide
  • TiO2
  • TiO2/Ag

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