Tổng hợp vật liệu Fe3O4@SiO2 đính Fe0 và xử lý methyl blue trong nước
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Abstract
This study aims to evaluate treatment ability of methyl blue (MB) dyes in water with Fe3O4@SiO2 attached Fe0 particles. The X-ray diffraction (XRD) technique was employed to characterize the structure of nanoparticles. The as-synthesized nanoparticles were analyzed by Fourier transform infrared spectroscopy (FTIR) technique to determine the presence of functional groups and bonds in the molecule. Surface morphology of as-synthesized Fe3O4@SiO2 nanoparticles was studied by scanning electron microscopy (TEM). The magnetic properties of Fe3O4 nanoparticles and Fe3O4@SiO2 attached Fe0 nanoparticles were evaluated by vibrating sample magnetometer technique (VSM). The as-synthesized material was in spherical shape with diameter of 100-500 nm, and its magnetism was 56.29 emu.g-1. The treatment of MB was conducted with 92.8% yield at pH 6.0 followed and fitted to pseudo-second order model and Langmuir isotherm adsoprtion model.
Tóm tắt
Nghiên cứu này nhằm đánh giá khả năng xử lý thuốc nhuộm methyl blue (MB) trong nước bằng hạt Fe3O4@SiO2 đính Fe0. Kỹ thuật nhiễu xạ tia X (XRD) được sử dụng để xác định đặc điểm cấu trúc của các hạt nano. Các hạt nano tổng hợp được phân tích bằng kỹ thuật quang phổ hồng ngoại biến đổi Fourier (FTIR) để xác định sự có mặt của các nhóm chức và các liên kết trong phân tử vật liệu hấp phụ (VLHP). Hình thái bề mặt của các hạt nano Fe3O4@SiO2 khi tổng hợp được nghiên cứu bằng kính hiển vi điện tử truyền qua (TEM). Tính chất từ của các hạt nano Fe3O4 và Fe3O4@SiO2 đính Fe0 được đánh giá bằng kỹ thuật từ kế mẫu rung (VSM). Vật liệu sau tổng hợp có dạng khối cầu và kích thước khoảng 100-500 nm với độ từ hóa 56,29 emu.g-1. Quá trình xử lý MB thu được hiệu suất 92,8% ở pH 6,0 và tuân theo mô hình động học giả kiến bậc 2 và mô hình hấp phụ đẳng nhiệt Langmuir.
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