Abstract
In this work, we proposed to immobilize Fe2O3 nanoparticles on the surface of magnetic CuFe2O4 particles by a facile impregnation – annealing method at different annealing temperatures (200, 300, 400 and 500°C) in order to create new heterogeneous photo-Fenton catalysts with enhanced catalytic performance for the oxidation of organic dyes. The influences of annealing temperatures used in the synthesis procedure on the phase composition, the morphology, the particle size and the surface functional groups of our catalysts were investigated by XRD, FE-SEM and FTIR techniques, respectively. The photo-Fenton catalytic performance was evaluated by the degradation of methylene blue under both UVA and visible light illumination in the presence of H2C2O4 as radical-producing source. According to the experimental results, Fe2O3 nanoparticles were successfully coated on CuFe2O4 surface, which successfully formed the α-Fe2O3 phase in the phase composition and also increased the Fe3+ content on the surface. As a consequence, the rate constant of photo-Fenton catalytic degradation of methylene blue over these samples were clearly improved. More especially, owing to the good magnetic property of CuFe2O4 component, our CuFe2O4/Fe2O3 samples were easy to be separated from the solution by a magnet, making them more feasible in practical applications of environmental treatment. Among our catalytic samples, the CuFe2O4/Fe2O3 sample annealed at 300°C showed the best performance with the highest rate constants under both UVA light and visible light. Its catalytic activities was found to be 6.8 times higher than CuFe2O4 under UVA light and 2.1 times higher than CuFe2O4 under visible light. However, when the annealing temperature was up to 500°C, the catalytic activity was reduced, which can be explained by the growth of particles and the stabilization of surface Fe-O bonds.
Highlights
In this work, we proposed to immobilize Fe2O3 nanoparticles on the surface of magnetic CuFe2O4 particles by a facile impregnation – annealing method at different annealing temperatures (200, 300, 400 and 500◦C) in order to create new heterogeneous photo-Fenton catalysts with enhanced catalytic performance for the oxidation of organic dyes
Starch-assisted sol-gel synthesis of magnetic CuFe2O4 powder as photo-Fenton catalysts in the presence of oxalic acid
Summary
Xử lý nước thải công nghiệp, đặc biệt là nước thải dệt nhuộm luôn là thách thức lớn với nhiều nhà khoa học trên thế giới khi mà các phân tử phẩm nhuộm hữu cơ độc hại như methylene xanh thường rất bền trong nước, không thể bị phân hủy bởi các phương pháp xử lý sinh học, hóa lý thông thường [1,2]. Nhóm nghiên cứu của Guo đã phát triển thành công hệ xúc tác composite Fe2O3–kaolin với khả năng phân hủy hiệu quả phẩm nhuộm rhodamine B theo cơ chế quang–Fenton dưới ánh sáng khả kiến trong khoảng pH trải dài từ [2,21] đến 10,13 8. He và các cộng sự cũng đã tổng hợp thành công vật liệu nano αFe2O3 với cấu trúc khoang rỗng nhằm ứng dụng làm xúc tác quang–Fenton dị thể cho phản ứng phân hủy phẩm nhuộm rhodamine B 9. Chúng tôi cũng đề nghị thay thế tác nhân H2O2 bằng H2C2O4, một tác nhân tạo gốc tự do bền hơn H2O2 và là lần đầu tiên được áp dụng cho hệ xúc tác CuFe2O4/Fe2O3, qua đó giúp tăng khả năng lưu trữ của hóa chất và tăng khả năng ứng dụng vào thực tế
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