XỬ LÝ MALACHITE GREEN TRONG NƯỚC BẰNG VẬT LIỆU COMPOSITE CHITOSAN/PECTIN/SiO2

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Tác giả: Đức Duy Lê, Kim Phụng Lý, Hồng Nam Nguyễn, Lê Huế Trân Nguyễn, Minh Nhựt Nguyễn, Trọng Hồng Phúc Nguyễn, Nguyễn Phương Lan Trần, Thị Minh Thư Trần

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.187 - 194

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Nghiên cứu này trình bày quy trình tổng hợp composite chitosan/pectin/SiO2 (CPS) ở nhiệt độ phòng, với tỷ lệ khối lượng chitosan/pectin (CP):SiO2 = 1:1.5 (g/g), thời gian khuấy trộn 0,5 giờ. Trong nghiên cứu này, pectin được trích ly từ vỏ bưởi và tro trấu được sử dụng để thu hồi SiO2. Các CPS được đánh giá đặc trưng bằng phương pháp nhiễu xạ tia X (XRD), phổ biến đổi hồng ngoại Fourier (FTIR), và kính hiển vi quét điện tử (SEM). Các nhóm chức đặc trưng của pectin, chitosan và SiO2 đều xuất hiện đầy đủ trong thành phần của CPS. Thí nghiệm hấp phụ xử lý malachite green (MG) được thực hiện ở pH 7, nồng độ MG 60 mg/L, khối lượng CPS 1 g/L, thời gian hấp phụ 30 phút. Dung lượng và hiệu suất hấp phụ MG lần lượt là 61,3 mg/g và 75,93%. Quá trình hấp phụ MG phù hợp với mô hình hấp phụ đẳng nhiệt Langmuir và Sips, sự hấp phụ diễn ra đồng nhất, đơn lớp, độc lập và là hấp phụ vật lý. Ngoài ra, động học của quá trình hấp phụ tuân theo mô hình động học giả kiến bậc hai. Vì vậy, CPS là vật liệu composite tiềm năng được ứng dụng để xử lý thuốc nhuộm MG trong môi trường nước.The synthesis process of chitosan/pectin/SiO2 composite (CPS) was performed under the following conditions: mass ratio of chitosan/pectin (CP):SiO2=1:1.5 (g/g), mixing time of 0.5 h at room temperature. In this work, pectin was extracted from pomelo peel while rice husk ash was used for silica recovery. The obtained CPS were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and Field emission scanning electron microscopy (FE-SEM). The typical functional groups of CP and SiO2 are fully appeared in CPS. Malachite green (MG) was used in this work to evaluate the dye removal possibility of CPS at pH 7, a MG concentration of 60 mg/L, a MG dosage of 1 g/L, and an adsorption time of 30 min. The MG adsorption capacity and adsorption efficiency are 61.3 mg/g and 75.93%, respectively. The MG adsorption process is consistent with the Langmuir and Sips isotherm adsorption models, meaning the adsorption takes place homogeneously, monolayer, independently and is physical adsorption. Besides, the kinetics of the MG adsorption process follows the pseudo 2nd order kinetic model. As a result, the CPS is a potential composite for treating MG dye in an aqueous solution.

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