NGHIÊN CỨU KHẢ NĂNG HẤP PHỤ THUỐC NHUỘM DIRECT RED 79 CỦA THAN HOẠT TÍNH CHẾ TẠO TỪ HẠT NHÃN=STUDY ON THE ADSORPTION CAPACITY OF DIRECT RED 79 DYE ON ACTIVATED CARBON PREPARED FROM LONGAN SEEDS

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Tác giả: Thị Hậu Vũ

Ngôn ngữ: vie

Ký hiệu phân loại:

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

Mô tả vật lý: tr.228 -237

Bộ sưu tập: Báo, Tạp chí

ID: 480397

Thêm vào giỏ

In this study, activated carbon was successfully synthesized from longan seeds (ACLS), using NaOH as the activating. The resulting ACLS exhibited a porous structure characterized by a specific surface area of 678.5 m2/g. Investigations into the factors influencing the adsorption of Direct Red 79 (DR79) dye by ACLS using the static adsorption method revealed the following: the optimal adsorption pH was found to be 3.0
the adsorption equilibrium was reached within 150 minutes at room temperature (25±10C). As the temperature increases within the studied range of 298 to 318K, the adsorption efficiency increases, with determined values of ΔGo <
0
ΔHo = 24.003 kJ/mol, indicating a spontaneous and endothermic process. The adsorption process of DR79 by ACLS was investigated using the Langmuir, Freundlich, Temkin, and Elovich adsorption isotherm models. Among these, the Langmuir isotherm model provided the best description of the DR79 adsorption. The maximum adsorption capacity of DR79 onto ACLS, as determined by this model, was 684.93 mg/g at 298K.Trong nghiên cứu này than hoạt tính đã được chế tạo thành công từ hạt quả nhãn (ACLS) sử dụng tác nhân hoạt hoá là NaOH. ACLS chế tạo được có cấu trúc xốp với diện tích bề mặt riêng là 678,5 m2/g. Nghiên cứu các yếu tố ảnh hưởng đến quá trình hấp phụ thuốc nhuộm Direct Red 79 (DR79) của ACLS theo phương pháp hấp phụ tĩnh chỉ ra rằng: pH hấp phụ tốt nhất là 3,0
thời gian đạt cân bằng hấp phụ là 150 phút ở nhiệt độ phòng (25±10C). Khi nhiệt độ tăng trong khoảng nhiệt độ khảo sát từ 298 ÷ 318K thì hiệu suất hấp phụ tăng và xác định được các giá trị ΔGo<
0
ΔHo = 24,003 kJ/mol chứng tỏ quá trình là tự xảy ra và thu nhiệt. Quá trình hấp phụ DR79 của ACLS được khảo sát theo mô hình đẳng nhiệt hấp phụ Langmuir, Freundlich, Temkin và Elovich. Theo mô hình đẳng nhiệt Langmuir sự hấp phụ DR79 được mô tả tốt nhất. Dung lượng hấp phụ cực đại DR79 của ACLS xác định được theo mô hình này là 684,93 mg/g ở 298K.

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