NGHIÊN CỨU KHẢ NĂNG HẤP PHỤ ARSENITE VÀ ARSENATE BẰNG VẬT LIỆU DIATOMITE BIẾN TÍNH LƯỠNG OXIT SẮT-MANGAN
Abstract
Bài báo này trình bày quá trình hấp phụ arsenite and arsenate bằng vật liệu biến tính lưỡng oxit sắt-mangan trên nền chất mang diatomite. Vật liệu biến tính được tổng hợp bằng phản ứng oxi hóa-khử giữa muối Fe(II) và KMnO4 trong môi trường pH=6. Đặc trưng vật liệu biến tính bằng các phương pháp nhiễu xạ tia X (XRD), kính hiển vi điện tử quét (SEM) và phương pháp phổ quang điện tử (XPS). Nồng độ dung dịch arsen được định lượng bằng phương pháp quang phổ hấp thụ nguyên tử (AAS). Đẳng nhiệt hấp phụ được thực hiện ở các pH khác nhau của dung dịch arsenite và arsenate từ 3,5-9,5, sử dụng các mô hình đẳng nhiệt Langmuir, Frendlich, Frendlich biến đổi (modified Freundlich) để nghiên cứu. Ngoài ra cơ chế hấp phụ, ảnh hưởng của lực ion NaCl, Na2CO3, Na3PO4, CaCl2, MgCl2 cũng được thảo luận.
References
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