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LaFeO3 có pha Cobalt cho sự phân hủy photo-Fenton của các chất ô nhiễm hữu cơ và tách nước hỗ trợ bởi ánh sáng nhìn thấy
Tóm tắt
Nhu cầu ngày càng tăng đối với các nguồn năng lượng sạch và những lo ngại ngày càng tăng về ô nhiễm môi trường đã dẫn đến sự quan tâm đáng kể trong việc phát triển các hệ thống quang xúc tác và quang điện hóa hiệu quả. Ở đây, chúng tôi báo cáo về sự phân hủy xúc tác photo-Fenton của thuốc nhuộm Methylene Blue (MB) dưới ánh sáng nhìn thấy trên các xúc tác LaFeO3 và LaCoxFe1−xO3 (x = 0.01, 0.05, 0.1) được tổng hợp qua phương pháp đốt cháy đơn giản. LaCo0.01Fe0.99O3 đã cải thiện đáng kể hiệu suất xúc tác photo-Fenton của LaFeO3 từ 67,75% lên 93,85% trong việc loại bỏ thuốc nhuộm MB sau 180 phút chiếu sáng. Các hằng số tốc độ được tính toán thông qua cơ chế động học bậc nhất giả định lần lượt là 0,00532/phút cho LaFeO3 và 0,01476/phút cho LaCo0.01Fe0.99O3. Ngoài ra, xúc tác hiệu quả nhất LaCo0.01Fe0.99O3 đã thể hiện hiệu suất phân hủy đáng kể đối với Tetracycline (TC) và Methyl Orange (MO) với hiệu suất lần lượt là 93,81% và 69,67%, cho thấy tính linh hoạt của nó. Hơn nữa, LaFeO3 nguyên chất và doped đã được tối ưu hóa cấu trúc bằng phương pháp DFT và các khoảng băng được tính toán theo dữ liệu thực nghiệm. Thú vị là, xúc tác này có thể được sử dụng như một loại điện xúc tác kích thích ánh sáng bên cạnh việc xử lý nước bằng cách tận dụng chức năng kép của nó. Xúc tác LaCo0.01Fe0.99O3 đạt được mật độ dòng điện chuẩn 10 mA/cm2 cho sự phát triển H2 ở một điện thế quá mức là 297 mV so với RHE, và đã cải thiện thêm xuống còn 190 mV so với RHE dưới ánh sáng. Công trình này cung cấp những hiểu biết có giá trị về việc tích hợp một phần Co vào vị trí B của LaFeO3 cho sự phát triển của các hệ thống quang xúc tác và điện xúc tác kích thích ánh sáng nhìn thấy, hy vọng sẽ đóng góp vào sự tiến bộ của sản xuất năng lượng bền vững và phục hồi môi trường.
Từ khóa
#Photo-Fenton #LaFeO3 #xúc tác quang #điện xúc tác #ô nhiễm hữu cơ #ánh sáng nhìn thấy #tách nướcTài liệu tham khảo
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