TỔNG HỢP, ĐẶC TRƯNG VÀ TÍNH CHẤT QUANG XÚC TÁC PHÂN HỦY KHÁNG SINH TRONG NƯỚC BẰNG VẬT LIỆU COMPOZIT ZnO-Fe3O4-CHITOSAN=SYNTHESIS, CHARACTERISTICS, AND PHOTOCATALYTIC DEGRADATION OF ANTIBIOTICS IN WATER USING ZnO-Fe3O4-CHITOSAN COMPOSITE

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Tác giả: Minh Quý Bùi, Thị Luyến Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học và Công nghệ - Đại học Thái Nguyên, 2024

Mô tả vật lý: tr.150 - 158

Bộ sưu tập: Metadata

ID: 480370

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Bài báo nghiên cứu về vật liệu tổ hợp ba thành phần ZnO, Fe3O4 và chitosan (CMZ). Kết quả cho thấy, đã tổng hợp thành công vật liệu compozit với nồng độ chitosan từ 5 – 20%. Vật liệu CMZ có kích thước tinh thể nhỏ hơn so với vật liệu compozit khi không có chitosan. CMZ có từ tính khá tốt, từ độ bão hòa của vật liệu giảm khi hàm lượng chitosan trong vật liệu tăng. CMZ có bề mặt xốp, tồn tại ở dạng kết đám với diện tích bề mặt bằng 59,2 m2/g. Năng lượng vùng cấm có giá trị bằng 2,83eV, nhỏ hơn so với ZnO riêng rẽ. Vật liệu CMZ với nồng độ chitosan là 5% có khả năng loại bỏ kháng sinh moxifloxacin và levofloxacin ra khỏi môi trường nước dưới điều kiện chiếu sáng, với hiệu suất lần lượt là 89,0% và 84,5% sau 180 phút chiếu sáng. Quá trình phân hủy kháng sinh tuân theo mô hình động học bậc nhất Langmuir – Hinshelwood với tốc độ phân hủy moxifloxacin diễn ra nhanh hơn levofloxacin. Cơ chế quá trình phân hủy quang xúc tác cũng được bàn luận trong nghiên cứu này.The article has studied the three-component composite material ZnO, Fe3O4, and chitosan (CMZ). The results showed that composite materials with chitosan concentrations ranging from 5 to 20% were successfully synthesized. CMZ had a smaller crystalline size than the composite material without chitosan. The magnetism of CMZ was quite good. The magnetic saturation of the material decreased as the chitosan content increased. CMZ had a porous surface, existing as clumps with a surface area of 59.2 m2/g. The band gap energy had a value of 2.83 eV, smaller than that of individual ZnO. CMZ material with a chitosan concentration of 5% was able to decompose the antibiotics moxifloxacin and levofloxacin from water under light, with efficiencies of 89.0% and 84.5%, respectively, after 180 minutes of illumination. The antibiotic decomposition process followed the Langmuir-Hinshelwood first-order kinetic model, with moxifloxacin decomposing faster than levofloxacin. The mechanism of photocatalytic decomposition was also discussed in this study.

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