TỔNG HỢP VÀ ĐÁNH GIÁ KHẢ NĂNG HẤP PHỤ RHODAMINE B CỦA VẬT LIỆU KHUNG HỮU CƠ-KIM LOẠI NHÔM TEREPHTHALATE=SYNTHESIS AND EVALUATION OF RHODAMINE B ADSORPTION CAPACITY OF ALUMINUM TEREPHTHALATE METAL-ORGANIC FRAMEWORK MATERIAL

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Tác giả: Đình Dũ Phạm

Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Khoa học và Công nghệ - Đại học Thái Nguyên, 2024

Mô tả vật lý: tr.159 - 166

Bộ sưu tập: Metadata

ID: 484532

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In this paper, aluminum terephthalate metal-organic framework material, also known as MIL-53(Al), was synthesized with solvothermal method and employed as an adsorbent for the removal of rhodamine B from aqueous solution. The influence of as-synthesized MIL-53(Al) treated temperature to remove unreacted terephthalic acid molecules was investigated. The material was characterized by using X-ray diffraction, thermogravimetry analysis, Fourier-transform infrared spectroscopy, scanning electron microscopy, and nitrogen adsorption-desorption isotherms. The results show that as-synthesized MIL-53(Al) comprises the shape of rice grains with a length of about 0.3 mm and exhibits a large specific surface area (1028.3 m2/g). Calcination to remove remaining terephthalic acid molecules in the framework increases the crystallinity, but significantly reduces the specific surface area of the material. The metal-organic framework structure still persists in a treated temperature of 450 °C. The adsorption capacity of MIL-53(Al) to remove rhodamine B from aqueous solution was also evaluated via Freundlich and Langmuir isotherm models. The Freundlich model showed better fit to the adsorption data than the Langmuir model. The maximum adsorption capacity determined by the Langmuir model is 17.04 mg/g.Trong bài báo này, vật liệu khung hữu cơ-kim loại nhôm terephthalate, còn gọi là MIL-53(Al), đã được tổng hợp bằng phương pháp nhiệt dung môi và được sử dụng làm chất hấp phụ để loại bỏ rhodamine B trong dung dịch nước. Ảnh hưởng của nhiệt độ xử lý vật liệu để loại bỏ các phân tử terephthalic acid không tham gia phản ứng đã được khảo sát. Vật liệu được đặc trưng bằng cách sử dụng phương pháp nhiễu xạ tia X, phân tích nhiệt trọng lượng, phổ hồng ngoại biến đổi Fourier, hiển vi điện tử quét và đẳng nhiệt hấp phụ-khử hấp phụ nitrogen. Kết quả cho thấy rằng MIL-53(Al) mới tổng hợp có hình dạng hạt gạo với chiều dài khoảng 0,3 mm và diện tích bề mặt riêng lớn (1028,3 m2/g). Việc nung để loại bỏ các phân tử terephthalic acid còn mắc kẹt lại trong khung mạng làm tăng độ tinh thể, nhưng lại làm giảm đáng kể diện tích bề mặt riêng của vật liệu. Cấu trúc khung hữu cơ-kim loại vẫn duy trì ở nhiệt độ xử lý tại 450 °C. Khả năng hấp phụ để loại bỏ rhodamine B trong dung dịch nước của MIL-53(Al) cũng được đánh giá thông qua mô hình đẳng nhiệt Freundlich và Langmuir. Mô hình Freundlich biểu hiện sự tương thích với dữ liệu hấp phụ hơn mô hình Langmuir. Dung lượng hấp phụ cực đại xác định theo mô hình Langmuir là 17,04 mg/g.

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