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Phân hủy phẩm nhuộm trong ngành dệt và hoạt tính thu gom của pha anatase hình cầu của các nanocatalyst Co–Ni-doped TiO2
Tóm tắt
Ô nhiễm phẩm nhuộm trong nước là một mối quan tâm toàn cầu do ảnh hưởng có hại của nó đến sức khỏe con người và hệ sinh thái thủy sinh. Cụ thể, ngành công nghiệp dệt may là một nguồn gây ô nhiễm màu độc hại, thường không được xử lý trước khi thải vào các nguồn nước tự nhiên gần đó. Trong số các phương pháp khác nhau, quang xúc tác nổi bật như là giải pháp hiệu quả nhất để giải quyết ô nhiễm phẩm nhuộm, với titan dioxide (TiO2) là quang xúc tác hàng đầu nhờ vào khả năng tuyệt vời trong việc loại bỏ phẩm nhuộm từ nước thải. Để nâng cao hiệu quả phân hủy phẩm nhuộm dưới ánh sáng UV, nhiều nghiên cứu đã tập trung vào việc tăng cường hiệu suất của TiO2 thông qua việc dop và thay đổi hình dạng của nó. Trong nghiên cứu này, pha anatase của các hạt nanoparticle TiO2 dop cobalt-nickel (Co–Ni) đã được tổng hợp bằng cả phương pháp hóa học và phương pháp tự nhiên, sử dụng kỹ thuật hỗ trợ bằng vi sóng. Các phương pháp này đã kết hợp polyvinylpyrrolidone (PVP) và Tinospora Cordifolia (T. Cordifolia) cho việc bao bọc hóa học và tự nhiên, tương ứng. Nhiều thuộc tính vật lý và hóa học của các hạt Co–Ni-doped đã được phân tích qua một loạt các kỹ thuật quang phổ đặc trưng. Các hạt bao bọc hiển thị cấu trúc tinh thể bát diện và hình thái cầu với kích thước hạt dao động từ 17 đến 24 nm. Trong quá trình đánh giá hiệu suất quang xúc tác của chúng đối với phẩm nhuộm methyl orange (MO) và methylene blue (MB), đã lưu ý rằng khi liều lượng của các hạt xúc tác tăng lên, tỷ lệ phân hủy cũng tăng theo khi tiếp xúc với bức xạ UV. Giá trị gần 100% cho việc phân hủy được ghi nhận đối với các phẩm nhuộm MO và MB. Hơn nữa, các hạt Co–Ni-doped bao bọc thể hiện hoạt tính chống oxy hóa đáng kể, với hiệu quả lên đến 93% trong thử nghiệm DPPH.
Từ khóa
#phân hủy phẩm nhuộm #quang xúc tác #TiO2 #vật liệu nano #hoạt tính chống oxy hóaTài liệu tham khảo
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