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Sửa đổi Diatomite bằng Oxit Sắt như một Chất Hấp Phụ Hiệu Quả cho Ion Selenit từ Nước: Nghiên Cứu Tổng hợp, Động lực học và Nhiệt động học
Tóm tắt
Trong nghiên cứu này, diatomite được sửa đổi bằng oxit sắt được sử dụng để loại bỏ ion selenit (Se(IV)) khỏi nước, và việc vận hành các yếu tố chính, bao gồm nồng độ anion ban đầu, thời gian tiếp xúc, liều lượng chất hấp phụ và pH của dung dịch, đang được điều tra. Kỹ thuật hiển vi điện tử quét và phân tích nhiễu xạ tia X đã chứng minh sự hình thành oxit sắt trong diatomite. Kết quả cho thấy tỉ lệ loại bỏ ion Se(IV) giảm khi giá trị pH tăng lên điều kiện kiềm. Khối lượng hấp phụ cao của Fe-diatomite được tính toán đạt 109,5 mg.g−1 dựa trên isotherm hấp phụ Langmuir, và sự kết hợp giữa hấp phụ vật lý và hóa học được xem là cơ chế của quá trình hấp phụ. Cuối cùng, nghiên cứu xác định rằng cả khuếch tán màng và khuếch tán trong hạt đều là các bước giới hạn tốc độ của quá trình hấp phụ ion Se(IV) lên Fe-diatomite.
Từ khóa
#Selenit #Diatomite #Oxit sắt #hấp phụ #Nhiệt động họcTài liệu tham khảo
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