Bước đầu nghiên cứu sự hấp phụ As(V) trên nano MnO2/chitosan composite=Initial study on the adsorption of As(V) on nano MnO2/chitosan composite

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Tác giả: Văn Phúc Đinh, Văn Đông Nguyễn, Thái Bình Võ

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Phát triển Khoa học & Công nghệ: Chuyên san Khoa học Tự nhiên, 2018

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Bộ sưu tập: Metadata

ID: 472998

Thêm vào giỏ

Khả năng lưu giữ arsenate trên vật liệu MnO2/Chitosan được nghiên cứu theo các mô hình hấp phụ tĩnh và động. Các yếu tố ảnh hưởng đến khả năng hấp phụ như pH, thời gian, nồng độ đầu As(V), tốc độ khuấy trộn và các ion cản trở đã được khảo sát. Kết quả cho thấy dung lượng hấp phụ cực đại của vật liệu này tính từ mô hình đẳng nhiệt Langmuir là 3,33 mg As(V)/g kém hơn so với nguyên liệu chitosan (12,5 mg As(V)/g). Tuy nhiên ở nồng độ đầu As(V) thấp (300 ppb) hiệu quả hấp phụ của vật liệu này (>
99%) cao hơn so với nguyên liệu chitosan (81%). Vật liệu có khả năng hấp phụ As(V) trong khoảng 3,06 – 9,13 nhưng hiệu quả nhất tại các pH 3-4. Các anion chloride, nitrate và sulfate ở hàm lượng 8000–10000 mg/L làm giảm 20% hiệu suất hấp phụ As(V). Vật liệu này có thể được sử dụng nhằm để loại bỏ As(V) trong mẫu nước ô nhiễm.The capability of chitosan-based MnO2 material for retention of arsenate in water was investigated for static and dynamic models. Several factors that influence the retention capacity of the material for As(V) such as pH, adsorption time, initial concentration of As(V), mixing speed (static) and competitive anions were studied. The results showed that the maximum adsorption capacity calculated from Langmuir model of As(V) on MnO2/chitosan was lower than that of chitosan (3.33 mg As/g compared to 12.5 mgAs/g). However, the retention efficiency for As(V) at low concentration (300 ppb) of MnO2/chitosan was much better than chitosan (>
99% compared to 81%). MnO2/chitosan material worked with As(V) within pH range of 3.06 – 9.13 with best efficiency within pH range of 3–4. Chloride, nitrate and sulfate anions at concentrations of 8000–10000 mg/L reduced 20% retention efficientcy of As(V). The studied material showed its great promise to be useful for As(V) removal from water

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