Hiệu suất quang xúc tác và khả năng tái sử dụng của cấu trúc dị hợp MoO3/BiVO4 dưới ánh sáng nhìn thấy

Applied Nanoscience - Tập 11 - Trang 2085-2094 - 2021
Maira Liaqat1, N. R. Khalid1
1Department of Physics, University of Gujrat, Gujrat, Pakistan

Tóm tắt

Công nghệ quang xúc tác dựa trên vật liệu nano bán dẫn đã nhận được sự quan tâm đáng kể trong các ứng dụng môi trường, đặc biệt là trong việc xử lý nước thải. Trong bài báo này, trước tiên, các nanobó BiVO4 đã được tổng hợp thành công bằng phương pháp thủy nhiệt, sau đó, các hạt nano MoO3 (với các hàm lượng thay đổi từ 0 đến 7 wt%) đã được trang trí trên các nanobó BiVO4 thông qua phương pháp kết tủa đồng, nhằm thiết kế xúc tác quang cấu trúc dị hợp. Cấu trúc, hình thái bề mặt và các tính chất quang học của các hợp chất dị hợp đã được khảo sát bằng các phương pháp quang phổ nhiễu xạ tia X (XRD), kính hiển vi điện tử quét (SEM), quang phổ hấp thụ UV–nhìn thấy và quang phổ phát quang (PL). Hiệu suất quang xúc tác của các hợp chất đã được đo cho sự phân hủy phẩm nhuộm methylene blue (MB) dưới ánh sáng quang học nhìn thấy (≥ 420 nm). Trong tất cả các mẫu, xúc tác quang 5%MoO3/BiVO4 cho thấy hiệu suất quang xúc tác vượt trội hơn so với BiVO4 nguyên chất. Hệ số tốc độ phân hủy tính toán cho phẩm nhuộm methylene blue trên xúc tác quang 5%MoO3/BiVO4 được tìm thấy gấp 2,5 lần và 4,0 lần so với BiVO4 và MoO3, tương ứng. Xúc tác quang mới này cũng cho thấy khả năng tái sử dụng tốt trong quá trình quang xúc tác phẩm nhuộm MB trong năm chu kỳ liên tiếp, điều này xác nhận khả năng tái sử dụng của hợp chất. Cơ chế phân hủy quang xúc tác qua dị hợp MoO3/BiVO4 cũng đã được thảo luận.

Từ khóa

#quang xúc tác #cấu trúc dị hợp #MoO3 #BiVO4 #nước thải #phân hủy vật liệu nhuộm

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