Nội dung được dịch bởi AI, chỉ mang tính chất tham khảo
Loại bỏ ion Cu(II) từ dung dịch nước bằng than hoạt tính được ngâm tẩm axit humic
Tóm tắt
Axit humic (HA) đã được ngâm tẩm vào than hoạt tính dạng bột để cải thiện khả năng hấp phụ Cu(II). Giá trị pH tối ưu cho việc loại bỏ Cu(II) là 6. Khả năng hấp phụ tối đa của than hoạt tính được ngâm tẩm HA đạt tới 5.98 mg·g−1, gấp năm lần so với khả năng của than hoạt tính nguyên chất. Các quá trình hấp phụ diễn ra nhanh chóng và đi kèm với những thay đổi về pH. Bằng cách sử dụng phương pháp tuyến tính, người ta xác định rằng dữ liệu thực nghiệm cân bằng được thể hiện tốt hơn bằng mô hình isotherm Langmuir so với mô hình isotherm Freundlich. Tích điện bề mặt và các nhóm chức năng bề mặt đã được nghiên cứu thông qua các phép đo giá trị zeta và FTIR để giải thích cơ chế đằng sau sự biến đổi của axit humic, giúp nâng cao khả năng hấp phụ Cu(II) của than hoạt tính.
Từ khóa
#axit humic #than hoạt tính #ion Cu(II) #hấp phụ #mô hình isotherm Langmuir #mô hình isotherm FreundlichTài liệu tham khảo
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