Chế tạo than sinh học biến tính từ vỏ mít thái phế phẩm ứng dụng hấp phụ Indigo carmine
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Abstract
In this study, biochar derived from Thai jackfruit peel was prepared through pyrolysis and subsequently modified to evaluate its adsorption performance toward Indigo Carmine (IC) in simulated wastewater. The structural characteristics of the modified biochar (Bio-P500) were analyzed using advanced techniques, including FT-IR, SEM, EDX, and nitrogen adsorption measurements. The results revealed that Bio-P500 exhibits a high specific surface area (1113.8 m2.g-1), a large pore volume (1,2 cm3.g-1). Bio-P500 achieved a maximum IC removal efficiency of 99.1%, with an adsorption capacity of 39.7 mg.g-1 after 60 minutes at room temperature. The Langmuir isotherm adsorption model best described the adsorption equilibrium with R2 = 0.994. Furthermore, the adsorption kinetic results showed that the adsorption process was beneficial for IC removal controlled by the pseudo-first-order (PFO) model. In addition, the material is also reusable with an adsorption efficiency of over 90% after three cycles, showing high potential in the application of dye treatment in industrial wastewater, contributing to environmental protection as well as industrial development associated with green chemistry.
Tóm tắt
Trong nghiên cứu này, than sinh học (TSH) biến tính từ vỏ mít Thái được chế tạo bằng phương pháp nhiệt phân và đánh giá khả năng hấp phụ Indigo carmine (IC) trong môi trường nước giả thải. Các đặc trưng cấu trúc của TSH biến tính từ vỏ mít Thái (Bio-P500) được xác định bằng các phương pháp phân tích hiện đại như FT-IR, SEM, EDX và khả năng hấp phụ khí nitơ. Kết quả cho thấy vật liệu Bio-P500 có diện tích bề mặt riêng (1113,8 m2.g-1) và thể tích lỗ xốp lớn (1,2 cm3.g-1). Vật liệu Bio-P500 có hiệu suất hấp phụ IC lên đến 99,1% với dung lượng hấp phụ thu được là 39,7 mg.g-1 sau 60 phút ở nhiệt độ phòng. Mô hình hấp phụ đẳng nhiệt Langmuir đã mô tả tốt nhất trạng thái cân bằng hấp phụ với R2 = 0,994. Hơn nữa, kết quả động học hấp phụ cho thấy quá trình hấp phụ có lợi cho việc loại bỏ IC được kiểm soát bằng mô hình giả bậc một (PFO). Ngoài ra, vật liệu còn có khả năng tái sử dụng ba lần với hiệu suất hấp phụ trên 90%, thể hiện tiềm năng ứng dụng xử lý thuốc nhuộm trong nước thải công nghiệp, góp phần bảo vệ môi trường cũng như phát triển công nghiệp gắn liền với hóa học xanh.
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