NGHIÊN CỨU KHẢ NĂNG XỬ LÝ AMMONIUM TRONG NƯỚC BẰNG THAN SINH HỌC TỪ VỎ CÀ PHÊ BIẾN TÍNH BẰNG H2O2=STUDY ON THE EFECTIVE REMOVERAL AMMONIUM FROM WATER OF H2O2 MODIFIED

NGHIÊN CỨU KHẢ NĂNG XỬ LÝ AMMONIUM TRONG NƯỚC BẰNG THAN SINH HỌC TỪ VỎ CÀ PHÊ BIẾN TÍNH BẰNG H2O2=STUDY ON THE EFECTIVE REMOVERAL AMMONIUM FROM WATER OF H2O2 MODIFIED - BIOCHAR FROM COFFEE HUSK

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Tác giả: Thủy Tiên Đỗ, Thanh Nam Nguyễn, Thị Huyền Nguyễn, Thị Ngọc Ánh Nguyễn, Thị Phương Anh Nguyễn, Thúy Hồng 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

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ID: 480372

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Biến tính than sinh học bằng các tác nhân hóa học là phương pháp phổ biến được ứng dụng gần đây để tăng khả năng hấp phụ của vật liệu. Trong nghiên cứu này, hydrogen peroxide (H2O2), một chất oxi hóa mạnh được sử dụng làm tác nhân biến tính cho than sinh học từ vỏ cà phê. Kết quả chụp hình ảnh hiển vi điện tử quét (SEM) cho thấy vật liệu thu được có cấu trúc mịn và xốp. Đo phổ hồng ngoại biến đổi Fourier (FTIR) cho thấy các nhóm chức đặc trưng trên bề mặt của vật liệu gồm các nhóm: hydroxyl (O-H), carbonyl (C=O) và carboxyl (-COOH). Nghiên cứu quá trình hấp phụ ammonium cho thấy điều kiện tối ưu cho việc hấp phụ của vật liệu là: pH = 7, hàm lượng của vật liệu hấp phụ là 6 g/L, thời gian hấp phụ là 20 phút, nồng độ ammonium ban đầu là 5 mg/L. Dung lượng hấp phụ cực đại của vật liệu theo mô hình đẳng nhiệt Langmuir là qm = 12,74 mg/g. Ứng dụng ban đầu để xử lý ammonium trong nước thải sinh hoạt cho thấy than biến tính có khả năng xử lý ammonium khá cao với hiệu suất là 69,43 %. Các kết quả này chỉ ra rằng thấy vật liệu than sinh học từ vỏ cà phê biến tính bằng H2O2 có tiềm năng trong xử lý ammonium trong môi trường nước.Biochar modification with chemical agents is a recently applied method to increase the adsorption capacity of materials. In this study, hydrogen peroxide (H2O2), a strong oxidant, was used as a biochar - modifing agent from coffee husk. Scanning electron microscope (SEM) result shows that the obtains material has a smooth and porous structure. Fourier transform infrared spectrometry (FTIR) revealed that the characteristic functional groups on the surface of the material include: hydroxyl groups (O-H), carbonyl groups (C=O) and carboxyl groups (-COOH). Research on the ammonium adsorption process shows that the optimal conditions for the adsorption of the material are: pH = 7, material content of 6 g/L, adsorption time is 20 minutes, initial ammonium concentration is 5mg/L. The highest adsorption capacity according to the Langmuir isotherm model of this material is qm = 12.74 mg/g. When treating ammonium in domestic wastewater, the material has an absorption efficiency of 69.43%. These results indicate that H2O2 modified - biochar from coffee husk could be a promising material in treating ammonium in water.

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