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Hoạt động quang xúc tác được cải thiện của các hợp chất ZnO–NiO được tổng hợp qua phương pháp siêu âm đơn giản
Tóm tắt
Sự hình thành các heterostructures với oxit p-type như NiO và CuO là một trong những phương pháp hiệu quả để cải thiện hiệu suất quang xúc tác của ZnO. Những hệ thống như vậy thường được tổng hợp thông qua các kỹ thuật tăng trưởng dựa trên mẫu, bao gồm nhiều bước. Chúng tôi đã chuẩn bị các hợp chất ZnO–NiO thông qua một phương pháp siêu âm đơn giản, không cần mẫu, ở nhiệt độ thấp. Phân tích kính hiển vi điện tử truyền qua độ phân giải cao cho thấy sự hình thành các heterostructures ZnO–NiO. Hoạt động quang xúc tác của các nanocomposite ZnO–NiO trong quá trình phân hủy thuốc nhuộm methylene blue dưới ánh sáng mặt trời được phát hiện là lớn hơn nhiều so với cả ZnO tinh khiết (1,26 × 10−2 phút−1) và NiO (0,31 × 10−2 phút−1), chứng minh hiệu ứng hiệp đồng. Hệ số phản ứng tăng khi tỷ lệ phần trăm của NiO trong hợp chất tăng và đạt 6,00 × 10−2 phút−1 cho mẫu có tỷ lệ phần trăm NiO cao nhất. Hệ số phản ứng cho chạy thứ hai và thứ ba được ước tính lần lượt là 4,4 × 10−2 và 4,2 × 10−2 phút−1, điều này rất hứa hẹn. Cơ chế chính của việc tăng cường hoạt động quang xúc tác của các hợp chất được xác định là sự phân tách hiệu quả hơn của các tải điện tích tự do được sinh ra do trường điện nội tại tại giao diện ZnO–NiO. Sự suy giảm mạnh về cường độ tương đối của phát xạ băng-băng của ZnO tại ~ 380 nm trong trường hợp các mẫu hợp chất và phân tích vị trí tương đối của băng dẫn conduction band và băng hóa trị valence band của ZnO và NiO hỗ trợ cơ chế được đề xuất.
Từ khóa
#ZnO #NiO #hợp chất quang xúc tác #siêu âm #heterostructureTài liệu tham khảo
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