ĐÁNH GIÁ KHẢ NĂNG HẤP PHỤ Pb2+ TRONG NƯỚC CỦA THAN SINH HỌC CÓ NGUỒN GỐC TỪ PHÂN BÒ = ASSESSMENT OF Pb2+ ABSORPTION CAPACITY IN WATER OF COW MANURE DERIVED BIOC-HAR

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Tác giả: Thị Mỹ Ngọc Lâm, Thị Thùy Trang Lê, Thanh Lam Nguyễn, Thị Cẩm Nhung Nguyễn, Văn Phương Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học Công nghệ và Thực phẩm, 2020

Mô tả vật lý:

Bộ sưu tập: NCBI

ID: 471467

Thêm vào giỏ

Bioc-har derived f-rom animal waste is currently attracting much attention on the adsorption potential for water environment treatment. Investigation of adsorption mechanism and treatment efficiency of Pb2+ in water by cow manure derived bioc-har at 300, 450 and 600 °C temperatures was conducted. The bioc-har was equilibrated with Pb2+ solution at different concentrations, ranging f-rom 0 to 160 mg/L for about 12 hours, and kinetic survey was conducted by exposing bioc-har to a solution containing 40 mgPb2+/L. Pb2+ adsorption process is suitable for Langmuir and Freundlich adsorption isotherm models for all 3 types of bioc-har. The maximum adsorption capacity of Pb2+ for bioc-har prepared at 300, 450 and 600 ºC is 40,5
21.1 and 76.9 mg/g, respectively. The kinetic survey shows that the adsorption process reaches equilibrium after 1 hour and the second pseudo model is suitable to explain the Pb2+ adsorption kinetics to 3 types of bioc-har. The results indicate that cow manure is a waste that can be converted into valuable bioc-har as an adsorbent to remove Pb2+ f-rom the water environment.Keywords Equilibrium and kinetics, adsorption of Pb2+, cow manure, bioc-har. Than sinh học có nguồn gốc từ chất thải chăn nuôi hiện đang thu hút nhiều sự chú ý về tiềm năng hấp phụ để xử lý môi trường nước. Khảo sát cơ chế hấp phụ Pb2+ và hiệu suất xử lý bằng than sinh học được điều chế từ phân bò ở các nhiệt độ 300, 450 và 600 °C đã được thực hiện. Than sinh học sau khi điều chế được cho cân bằn với dung dịch Pb2+ ở nhiều nồng độ khác nhau, dao động 0-160 mg/L trong khoảng 12 giờ và khảo sát động học khi than được tiếp xúc với dung dịch chứa 40 mg Pb2+/L ở những thời gian khảo sát khác nhau. Quá trình hấp phụ Pb2+ của 3 loại than phù hợp với mô hình đẳng nhiệt hấp phụ của Langmuir và Freundlich. Khả năng hấp phụ tối đa của Pb2+ cho than điều chế ở 300, 450 và 600 °C lần lượt là 40,5
21,1 và 76,9 mg/g. Khảo sát động học cho thấy quá trình hấp phụ đạt trạng thái cân bằng sau 1 giờ và mô hình động học giả bậc 2 là phù hợp để giải thích động học quá trình hấp phụ Pb2+ lên 3 dạng than sinh học. Kết quả chỉ ra rằng phân bò là chất thải có thể được chuyển đổi thành than sinh học có giá trị như một chất hấp phụ để loại bỏ Pb2+ khỏi môi trường nước.Từ khóa Cân bằng và động học, hấp phụ Pb2+, phân bò, than sinh học.

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