Nghiên cứu tính chất từ và khả năng hấp phụ Pb(II) của các hạt nano Fe3O4 và MnFe2O4 chế tạo bằng phương pháp đồng kết tủa có sự hỗ trợ của sóng siêu âm

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Tác giả: Đình Khánh Hoàng, Văn Đăng Nguyễn, Văn Khiển Nguyễn, Anh Tuấn Phạm, Hoài Linh Phạm, Ngọc Bách Tạ

Ngôn ngữ: vie

Ký hiệu phân loại: 541.378 Magnetochemistry

Thông tin xuất bản: Khoa học và Công nghệ - Đại học Thái Nguyên, 2018

Mô tả vật lý: 155-161

Bộ sưu tập: Metadata

ID: 492310

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Bài báo này trình bày các kết quả nghiên cứu tính chất từ và khả năng hấp phụ Pb2+ của các hạt nano Fe3O4 và MnFe2O4 được chế tạo bằng phương pháp đồng kết tủa hỗ trợ sóng siêu âm. Cấu trúc tinh thể, hình thái học, kích thước và tính chất từ của mẫu vật liệu được xác định bằng các phép đo phổ nhiễu xạ tia X (XRD), kính hiển vi điện tử phát xạ trường (FESEM) và từ kế mẫu rung (VSM). Kết quả phân tích cho thấy, trong cùng một điều kiện chế tạo, các hạt nano Fe3O4 có dạng hình cầu với kích thước trung bình cỡ 12 nm và các hạt nano MnFe2O4 có dạng hình tựa lập phương với kích thước trung bình cỡ 20 nm. Hai mẫu vật liệu đều thể hiện đặc tính siêu thuận từ ở nhiệt độ phòng với nhiệt độ khóa cho mẫu Fe3O4 và MnFe2O4 lần lượt là 251 K và 268 K. Giá trị mô men từ bão hòa thu được cho các mẫu là cao, mẫu Fe3O4 có mô ment từ bão hòa là 72 emu/g và mẫu MnFe2O4 là 65 emu/g. Khả năng hấp phụ Pb2+ của các hạt nano từ được khảo sát, kết quả cho thấy các hạt nano này có dung lượng hấp phụ cao. Hạt nnao Fe3O4 có khả năng hấp phụ Pb2+ với dung lượng 65,83 mg/g và hạt nano MnFe2O4 là 47,66 mg/g.In this paper, we present the research results on magnetic properties and Pb2+ adsorption capacity of Fe3O4 and MnFe2O4 nanoparticles synthesized by ultrasonic assisted co-precipitation method. The crystalline, morphology, particle diameter and magnetic properties of nanoparticles were investigated by X-ray diffraction, Field emission Scanning Electron Microscopy (FESEM) and Vibrating- Sample magnetometer (VSM). The analysis results indicate that under the same synthesized condition, Fe3O4 nanoparticles showed the spherical in shape with average size of 12 nm whereas MnFe2O4 nanoparticles offered near cubic shape with average size of 20 nm. Both samples exhibited superparamagnetic behavior at room temperature, blocking temperatures are 251 K and 268 K for Fe3O4 nanoparticles and MnFe2O4 nanoparticles, respectively. Magnetic nanoparticles also possese good magnetic properties with high saturation magnetizations of 72 emu/g for Fe3O4 sample and 65 emu/g for MnFe2O4 sample. Batchs experiments were carried out to investigate the Pb adsorption capacity of these magnetic nanoparticles. The adsorption data from our experiments fit the Langmuir isotherm confirmed that both samples yield the excellent adsorption property with the maximum adsorption capacity is 65.83 mg/g for Fe3O4 nanoparticles and 47.66 mg/g for MnFe2O4 nanoparticles.

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