COMPARISON OF CATALYTIC ACTIVITIES OF MAGNETIC IRON OXIDES IN PHENOL DEGRADATION

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Tác giả: Thi Phuong Quynh Bui, Thi Kim Anh Le, Nguyen An Sa Tran

Ngôn ngữ: eng

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Thông tin xuất bản: Tạp chí Khoa học Công nghệ và Thực phẩm (Tên mới: Tạp chí Khoa học Đại học Công Thương), 2022

Mô tả vật lý: tr.12

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ID: 335796

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Các vật liệu mang từ tính trên nền oxit sắt luôn thu hút được sự chú ý lớn trong lĩnh vực xúc tác do chúng có độ hoạt động hóa học cao, nguồn cung cấp rộng, cũng như dễ thu hồi và tái sử dụng. Nội dung chính của nghiên cứu này là khảo sát hoạt tính xúc tác của các loại oxit sắt, được tổng hợp qua hai quy trình khác nhau, trong phản ứng dị thể kiểu Fenton để phân hủy phenol. Dữ liệu phân tích XRD và SEM cho thấy hai loại oxit sắt là Fe3O4 tinh thể và oxit sắt vô định hình kích thước nano đã được tạo thành. Ảnh hưởng của thời gian phản ứng, lượng hydrogen peroxide và lượng chất xúc tác rắn lên hiệu suất loại bỏ phenol đã được khảo sát chi tiết. Kết quả cho thấy vật liệu từ tính Fe3O4 tinh thể (1-5 μm) cho hiệu suất xử lý phenol cao hơn so với vật liệu oxit sắt vô định hình kích thước nano trong cùng điều kiện phản ứng. Tuy nhiên, tốc độ oxy hóa phenol ban đầu nhanh hơn nhiều khi dùng vật liệu xúc tác oxit sắt vô định hình. Hiệu suất loại bỏ phenol hơn 98% (nồng độ ban đầu 200 ppm) đã đạt được với xúc tác Fe3O4 tinh thể sau 60 phút. Vật liệu oxit sắt vô định hình cũng cho hiệu suất tương đồng chỉ sau 15 phút nhưng cần lượng chất xúc tác và lượng hydrogen peroxide cao hơn đáng kể so với xúc tác Fe3O4 tinh thể.Magnetic iron oxide-based materials have attracted great attention in catalysis due to their high activity, large availability, and easy catalyst collection and recycling. This work reports catalytic activities of magnetic iron oxides, which were synthesized via two different routes involving organic stabilizers, for the heterogeneous Fenton-like oxidation of phenol. Two kinds of catalysts, including crystalline Fe3O4 and amorphous nano-sized iron oxide particles, were formed according to the XRD and SEM data. Effects of reaction time, hydrogen peroxide amount, and solid catalyst on phenol degradation efficiency using the as-synthesized materials were investigated. The results showed that the synthesized crystalline Fe3O4 particles (1–5 μm) provided a higher overall phenol removal efficiency than the amorphous nano-sized iron oxide under similar reaction conditions. However, the initial oxidation rate was much faster by using the amorphous one. More than 98% phenol removal was obtained with the crystalline Fe3O4 after 60 min, while a similar efficiency was also achieved with the amorphous nano-sized iron oxide after 15 min but at significantly higher catalyst and H2O2 amounts.

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