TỔNG HỢP VÀ KHẢO SÁT ĐẶC TÍNH CỦA γ-Al2O3@MgO ỨNG DỤNG CHO HẤP PHỤ Pb TRONG DUNG DỊCH

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Tác giả: Minh Tuan Duong, Minh Tuân Dương, Van Hao Ha, The Son Le, Thi Vinh Hanh Le, Kim Thanh Nguyen, Thi Lan Anh Nguyen, Viet Linh Pham, Vu Sinh Tran

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Journal of Science and Technique: Section on Physics and Chemical Engineering, 2023

Mô tả vật lý: tr.113

Bộ sưu tập: Metadata

ID: 347080

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Nghiên cứu này tập trung vào việc nâng cao khả năng hấp phụ cho các ion chì bằng cách đưa MgO lên bề mặt γ-Al2O3, tạo thành Al2O3@MgO. Các hạt nano γ-Al2O3 được tổng hợp bằng phương pháp sol-gel trên mẫu citrate. MgO được tích hợp lên bề mặt của các hạt nano γ-Al2O3, với nồng độ MgO khác nhau (5%, 10% và 15% trọng lượng). Các phát hiện chỉ ra rằng cả hai pha tinh thể γ-Al2O3 và MgO đều có cấu trúc lập phương (nhóm đối xứng Fd3m), được hình thành trong mẫu. Mặc dù diện tích bề mặt riêng giảm từ 166 m2/g xuống 135 m2/g, độ bazơ bề mặt tăng tỉ lệ thuận với lượng MgO đưa vào mẫu. Ảnh hưởng của các điều kiện hấp phụ khác nhau như pH, khối lượng chất hấp phụ và thời gian tiếp xúc đến khả năng hấp phụ ion Pb2+ đã được kiểm tra có hệ thống. Điều kiện tối ưu (pH = 7, thời gian hấp phụ 8 giờ) cho thấy vật liệu γ-Al2O3 chứa 10% MgO tính theo trọng lượng cho khả năng hấp phụ Pb2+ cao nhất ở mức 145 mg/g, vượt qua khả năng hấp phụ 135 mg/g của vật liệu γ-Al2O3.This study focuses on enhancing the adsorption capacity for lead ions by introducing MgO onto the surface of γ-Al2O3, forming γ-Al2O3@MgO. The γ-Al2O3 nanoparticles were synthesized via the sol-gel method on a citrate template. MgO was incorporated onto the surface of the γ-Al2O3 nanoparticles, with varying MgO concentrations (5%, 10%, and 15% by weight), achieved through the absorption of magnesium ions onto the material's surface followed by sintering at 773K. The findings indicated that both the γ-Al2O3 and MgO crystalline phases exhibit a cubic structure (Fd3m symmetry group), which is formed within the sample. Although the specific surface area diminished from 166 m2/g to 135 m2/g, the surface basicity increased proportionally to the amount of MgO incorporated into the sample. The impacts of various absorption conditions such as pH, adsorbent mass, and contact time on the Pb2+ ion adsorption capacity was systematically examined. Optimal conditions (pH = 7, adsorption time of 8 hours) highlighted that the γ-Al2O3 material containing 10% MgO by weight showcased the highest Pb2+ adsorption capacity at 145 mg/g, surpassing the adsorption capacity of 135 mg/g for the γ-Al2O3 material.

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