HẤP PHỤ ARSENATE TRONG NƯỚC BẰNG VẬT LIỆU TỔ HỢP NANO TỪ TÍNH ZnFe2O4/α-Fe2O3/THAN SINH HỌC: NGHIÊN CỨU NHIỆT, ĐỘNG HỌC

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Tác giả: Minh Quý Bùi, Thị Luyến Nguyễn

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.170 - 177

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ID: 462532

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Sự hấp phụ arsenate trong nước bằng vật liệu tổ hợp nano từ tính ZnFe2O4/α-Fe2O3/than sinh học (MBC) đã được nghiên cứu trong bài báo này. Các nghiên cứu thực nghiệm hấp phụ được thực hiện bằng cách thay đổi độ pH, nhiệt độ rung lắc và nồng độ As5+ ban đầu. Khả năng hấp phụ As5+ phụ thuộc vào pH và cho thấy hiệu quả loại bỏ As5+ tối đa ở pH 8.0. Nghiên cứu sự hấp phụ asen ở nồng độ ban đầu là 5–35 mg/L được thực hiện ở pH 8.0 và nhiệt độ 303 K, 313 K và 323 K. Mô hình hấp phụ đẳng nhiệt Langmuir, Freundlich và Temkin được sử dụng để phân tích số liệu thực nghiệm. Động học hấp phụ được nghiên cứu bằng mô hình giả bậc nhất, giả bậc hai và mô hình Elovich. Các mô hình giả bậc hai và mô hình Langmuir được làm khớp phù hợp với sự hấp phụ As5+ trên MBC. Sự hấp phụ arsenate bằng vật liệu MBC chủ yếu được kiểm soát bởi cơ chế hấp phụ hóa học và vật lý. MBC có thể dễ dàng được thu hồi và tái sử dụng bằng cách sử dụng từ trường bên ngoài. MBC có tiềm năng đạt được hiệu suất hấp phụ cao.The adsorption of arsenate into the water by magnetic ZnFe2O4/α-Fe2O3/biochar nanocomposite (MBC) were investigated in this article. Batch mode adsorption studies were carried out by varying pH, shaking temperature, and initial As5+ concentration. The adsorption of As5+ was pH dependent and showed maximum removal efficiency of As5+ at pH 8.0. Adsorption studies of 5–35 mg/L initial As5+ concentration were carried out at pH 8.0 and temperature of 303 K, 313 K, and 323 K. Langmuir and Freundlich, Temkin isotherm adsorption models were used to analyze the experimental data. The kinetic adsorption was studied using pseudo-first-order, pseudo-second-order, and Elovich models. The pseudo-second-order and Langmuir models fitted the adsorption of As5+ onto MBC. The adsorption of arsenate onto MBC was mainly controlled by the chemisorption and physisorption adsorption mechanisms. MBC could be easily recovered and reused using an external magnetic field. MBC had the potential to be high adsorption efficiency.

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