مجله آب و فاضلاب

مجله آب و فاضلاب

بررسی تأثیر pH محیط سنتز بر مورفولوژی و عملکرد فتوکاتالیستی BiVO4/g-C3N4 در حذف آلاینده نساجی اسید بلو 92

نوع مقاله : مقاله پژوهشی

نویسندگان
محمد عرفان آگاه عالم 1
طیبه حمزه لویان 2
شهناز قاسمی 3
1 دانشجوی کارشناسی ارشد، گروه مهندسی محیط‌زیست، دانشکده مهندسی شیمی و نفت، دانشگاه صنعتی شریف، تهران، ایران
2 استادیار، گروه ترموسینتیک و کاتالیست، دانشکده مهندسی شیمی و نفت، دانشگاه صنعتی شریف، تهران، ایران
3 استادیار، پژوهشکده علوم و فناوری‌های انرژی، آب و محیط‌زیست، دانشگاه صنعتی شریف، تهران، ایران
10.22093/wwj.2025.540493.3507
چکیده
روش‌های سنتی تصفیه فاضلاب، توانایی حذف کامل آلاینده‌های مقاومی مانند رنگ‌های نساجی و فلزات سنگین را ندارند. در این میان، فرایندهای اکسیداسیون پیشرفته با تولید رادیکال‌های فعال، امکان تجزیه مؤثر این ترکیبات را فراهم می‌کنند. یکی از راهکارهای کارآمد، استفاده از فتوکاتالیست‌های نیمه‌رسانا با بازده حذف و پایداری بالا است. در این پژوهش، نانو کامپوزیت BiVO4/g-C3N4 به روش هیدروترمال در سه محیط با pH مختلف (اسیدی، خنثی و بازی) سنتز و ویژگی‌های ساختاری و عملکرد فتوکاتالیستی آن بررسی شد. نتایج XRD نشان داد که فاز مونوکلینیک BiVO4 در هر سه نمونه تشکیل شده است. تصاویر FESEM بیانگر تأثیر pH بر مورفولوژی ذرات بوده و در محیط بازی ساختارهای مکعبی و ذوزنقه‌ای سه‌بعدی با توزیع یکنواخت مشاهده شد. آزمون فتوکاتالیستی در تجزیه رنگ اسید بلو ۹۲ تحت تابش نور مرئی در حضور ppm 200 فتوکاتالیست و غلظت آلاینده ppm  20 نشان داد که نمونه سنتز شده در pH=10 بیشترین کارایی (حدود ۷۵ درصد در ۱۲۰ دقیقه) را دارد. همچنین نتایج طیف‌های DRS و PL نشان‌دهنده‌ کاهش نرخ بازترکیب الکترون- حفره در نمونه‌ کامپوزیتی نسبت به فتوکاتالیست‌های خالص بود. درمجموع، بهبود عملکرد فتوکاتالیستی BiVO4/g-C3N4 در محیط بازی به ساختار منظم سه‌بعدی، سطح ویژه‌ بالاتر و انتقال مؤثرتر حامل‌های بار نسبت داده می‌شود.
کلیدواژه‌ها
فتوکاتالیست کامپوزیتی کربن نیترید گرافیتی/بیسموت وانادات
اسیدیته محیط سنتز
آلاینده آبی اسید بلو 92
مورفولوژی فتوکاتالیست
نیمه‌هادی فعال در نور مرئی
تصفیه فاضلاب

عنوان مقاله English

Effect of Synthesis pH on the Morphology and Photocatalytic Performance of BiVO₄/g-C₃N₄ for Acid Blue 92 Degradation

نویسندگان English

Mohammaderfan Agahalam 1
Tayebeh Hamzehlouyan 2
Shahnaz Ghasemi 3
1 M.Sc. Student, Dept. of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran
2 Assist. Prof., Dept. of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran
3 Assist. Prof., Sharif Energy, Water and Environment Institute, Sharif University of Technology, Tehran, Iran
چکیده English

Textile dyes and heavy metals cannot be completely removed from wastewater using traditional wastewater treatment methods. Meanwhile, advanced oxidation processes produce active radicals that facilitate the decomposition of these compounds. Among these, semiconductor photocatalysts offer high removal efficiency and chemical stability. In this study, BiVO4/g-C3N4 nanocomposites were synthesized hydrothermally under acidic, neutral, and basic pH conditions; the prepared samples were then characterized, and their photocatalytic activity was evaluated. The XRD results showed that all three samples formed the monoclinic phase of BiVO4. The FESEM images revealed the effect of pH on particle morphology, showing cubic, polygonal, and three-dimensional trapezoidal structures with a uniform distribution in the basic environment. The sample synthesized at pH=10 has the highest efficiency (approximately 75% in 120 minutes) when decomposing the Acid Blue 92 dye under visible light irradiation, in the presence of 200 ppm of the photocatalyst and 20 ppm of the pollutant. In addition, DRS and PL spectra indicate a decrease in electron-hole recombination in the composite sample versus pure photocatalysts. A three-dimensional structure, a high specific surface area, and a more efficient charge carrier transport are among the reasons for the enhanced photocatalytic performance of BiVO4/g-C3N4 in the basic medium.

کلیدواژه‌ها English

Graphite Carbon Nitride/Bismuth Vanadate Composite Photocatalyst
Acidity of Synthesis Medium
Acid Blue 92
Photocatalyst Morphology
Visible-Light-Active Semiconductor
Wastewater Treatment
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مجله آب و فاضلاب
دوره 36، شماره 2 - شماره پیاپی 157
خرداد و تیر 1404
صفحه 63-81