Tối ưu hóa tổng hợp, đặc trưng và ứng dụng của chất hấp thụ ZIF-8 để loại bỏ dầu ô liu khỏi dung dịch nước

Maedeh Anisi1, Ali Asghar Ghoreyshi1, Elaheh Mehrvarz1, Ahmad Rahimpour1
1Chemical Engineering Department, Babol Noshirvani University of Technology, Babol, Iran

Tóm tắt

Xét về tầm quan trọng của chất lượng nước và khía cạnh môi trường, chất hấp thụ khung imidazolate zeolitic-8 (ZIF-8) đã được tổng hợp qua phương pháp solvothermal để loại bỏ dầu khỏi nước. Phương pháp thiết kế mặt phản hồi - thiết kế tổ hợp trung tâm (RSM-CCD) sử dụng phần mềm thống kê (Design expert, phiên bản 8.0.6) đã được áp dụng để xác định ảnh hưởng của ba biến độc lập trong quy trình tổng hợp ZIF-8 bao gồm tỉ lệ mol ligand/muối, tỉ lệ mol dung môi/muối và nhiệt độ tổng hợp lên khả năng hấp phụ dầu và hiệu suất của chất hấp thụ như là các phản hồi của RSM. Các điều kiện tối ưu để chuẩn bị ZIF-8 được tìm thấy như sau: tỉ lệ mol ligand/muối là 10.4, tỉ lệ dung môi/muối là 702.7 và nhiệt độ là 52.9 °C, dẫn đến khả năng hấp phụ 1120 mg/g dầu ô liu và 43% hiệu suất ZIF-8. Các thuộc tính hình thái và cấu trúc của chất hấp thụ được chuẩn bị đã được đặc trưng bởi phân tích hấp phụ-desorption N2, XRD, FE-SEM và FTIR. Các thí nghiệm hấp phụ cân bằng lô đã được tiến hành dưới các tham số hệ thống khác nhau dự kiến ảnh hưởng đến khả năng hấp phụ của ZIF-8 bao gồm nồng độ dầu, liều lượng ZIF-8, thời gian tiếp xúc và nhiệt độ. Đường đồng thể tích và động học hấp phụ dầu ô liu lên ZIF-8 theo mô hình Freundlich và mô hình động học giả định bậc nhất tương ứng. Việc đánh giá các tham số nhiệt động lực học cho thấy hấp phụ dầu ô liu lên ZIF-8 tối ưu là tự phát và tỏa nhiệt. Ngoài ra, ZIF-8 đã sử dụng có thể được tái thu hồi hiệu quả bằng phương pháp rửa ethanol đơn giản. Dựa trên kết quả thực nghiệm, ZIF-8 được chuẩn bị trong nghiên cứu này có thể được sử dụng thành công trong việc tách hỗn hợp dầu/nước.

Từ khóa


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