Nghiên cứu tổng hợp BiVO4 bằng tác nhân khử thiourea và ứng dụng cho phản ứng phân hủy methylene blue sử dụng ánh sáng nhìn thấy

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Tác giả: Đại Vũ Cao, Duy Trinh Nguyễn, Hữu Vinh Nguyễn, Xuân Linh Nông

Ngôn ngữ: vie

Ký hiệu phân loại: 541.35 Photochemistry

Thông tin xuất bản: Tạp chí khoa học và công nghệ - Đại học Nguyễn Tất Thành, 2018

Mô tả vật lý: 27-32

Bộ sưu tập: Metadata

ID: 492382

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In this study, BiVO4 was synthesized successfully through co-precipitation method. Materials were characterized by advanced physical analysis methods, such as XRD, SEM, Raman and UV-Vis DRS. The XRD and Raman results shown that the material was made up of the high monoclinic phase of BiVO4. Thermal processing had an important influence on the morphology and crystallinity of BiVO4: samples were calcined at 400°C and 500°C granular crystals, less than 1μm in size
when the calcined temperature was 600°C, the forming material had granular crystalline form with insignificant granular boundaries and particles were deposited into large plates with openings formed between the particles. The Eg value of BiVO4 samples was in the range of 2.11-2.29eV. The heat treatment can enhance the photocatalytic activity of the BiVO4, the best photocatalytic activity obtained with the calcined at 600°C (about 98.93% MB removed after 240 minutes of lighting). While the BiVO4 sample was synthesised without thiourea and calcined at 600°C, only 85.54% MB was removed.Trong nghiên cứu này, BiVO4 được tổng hợp thành công thông qua phương pháp đồng kết tủa. Vật liệu được đặc trưng cấu trúc bằng các phương pháp phân tích vật lí hiện đại như XRD, SEM, Raman và UV-Vis DRS. Kết quả XRD và Raman cho thấy vật liệu được tạo thành với thành phần pha monoclinic của BiVO4 cao. Quá trình xử lí nhiệt có ảnh hưởng quan trọng đến hình thái và kích thước tinh thể của BiVO4: mẫu được nung ở 400°C và 500°C tinh thể có dạng hạt, kích thước dưới 1mm
khi nhiệt độ nung là 600°C, vật liệu tạo thành có hình thái tinh thể dạng hạt với biên hạt không rõ ràng và các hạt kết tụ thành mảng có kích thước lớn với các khe hở được tạo thành giữa các hạt. Vật liệu tạo thành có năng lượng vùng cấm hẹp, giá trị Eg của các mẫu BiVO4 nằm trong khoảng 2.11-2.29eV. Quá trình xử lí nhiệt có thể tăng cường hoạt tính quang xúc tác của mẫu BiVO4 tổng hợp sử dụng thiourea, hoạt tính quang xúc tác tốt nhất đạt được với mẫu nung ở 600°C, khoảng 98.93% MB được loại bỏ sau 240 phút chiếu sáng. Trong khi mẫu BiVO4 tổng hợp không sử dụng thiourea và nung ở 600°C, chỉ khoảng 85.54% MB được loại bỏ.

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