Luận án Nghiên cứu chế tạo vật liệu trên cơ sở Spinel Ferrite ứng dụng để xử lý kim loại nặng và chất màu hữu cơ độc hại trong môi trường nước

- Tổng hợp thành công hệ vật liệu từ tính spinel ferrite Cu-MgFe2O4 bằng phương pháp đồng kết tủa. Vật liệu spinel của 2 ion kim loại Cu0.5Mg0.5Fe2O4 có từ độ bão hòa 23,1 emu/g, cấu trúc đồng đều với kích thước hạt trung bình 29,5 nm, hình thành đơn pha spinel khi nung ở 900 oC và có diện tích bề mặt cũng như tính chất xốp cao hơn so với vật liệu spinel ferrite CuFe2O4 và MgFe2O4. - Nghiên cứu khả năng hấp phụ ion kim loại Pb2+ của vật liệu spinel ferrite Cu0.5Mg0.5Fe2O4. Khi thay thế Mg2+ vào cấu trúc của CuFe2O4 đã làm cải thiện dung lượng hấp phụ Pb2+ của CuFe2O4. Quá trình hấp phụ Pb2+ của vật liệu Cu0.5Mg0.5Fe2O4 tuân theo mô hình đẳng nhiệt Langmuir và động học biểu kiến bậc 2. Dung lượng hấp phụ Pb2+ cực đại của vật liệu Cu0.5Mg0.5Fe2O4 là 57,44 mg/g ở pH = 7 và T = 25 oC. Vật liệu Cu0.5Mg0.5Fe2O4 có tính hấp phụ chọn lọc, tương đối bền và ổn định đối với sự hấp phụ loại bỏ Pb2+, có khả năng tái sử dụng tốt và dễ dàng thu hồi sau mỗi chu kỳ sử dụng. - Tổng hợp thành công vật liệu TiO2 và vật liệu tổ hợp Cu0.5Mg0.5Fe2O4/TiO2 bằng phương pháp sol-gel. Giá trị năng lượng vùng cấm của vật liệu tổ hợp Cu0.5Mg0.5Fe2O4/TiO2 là 2,86 eV so với 3,25 eV của TiO2, sự phân tách điện tử của vật liệu Cu0.5Mg0.5Fe2O4/TiO2 tốt hơn so với vật liệu TiO2 và Cu0.5Mg0.5Fe2O4, do đó đã thể hiện hoạt tính xúc tác quang hóa tốt. Vật liệu tổ hợp Cu0.5Mg0.5Fe2O4/TiO2 có từ độ bão hòa là 11,2 emu/g , có khả năng tái sử dụng tốt và dễ dàng thu hồi sau mỗi chu kỳ sử dụng.

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Journal of Physics Chemistry of Solids, 100, pp.71-77. 159 PHỤ LỤC Phụ lục 1: Phổ XRD lần lượt của các mẫu Cu0.5Mg0.5Fe2O4 nung ở 400÷1000 o C trong 2 giờ; MgFe2O4; CuFe2O4; TiO2 và Cu0.5Mg0.5Fe2O4/TiO2. 160 161 162 163 164 Phụ lục 2: Phổ khối MS và sắc ký đồ của các mẫu RhB tại các thời điểm khác nhau: 0 phút; 60 phút, 120 phút, 180 phút. RhB: 443 165 DER: 415 166 EER, DR: 387 167 ER: 359 168 Phụ lục 3: Sắc đồ đo TOC của các mẫu RhB tại các thời điểm khác nhau (a) 0 phút; (b) 30 phút; (c) 60 phút; (d) 90 phút; (e) 120 phút; (f) 150 phút và (g) 180 phút. 169 170 171 Phụ lục 4: Đường chuẩn phân tích Pb2+

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