NGHIÊN CỨU KHẢ NĂNG HẤP PHỤ Zn2+ BẰNG KHOÁNG SÉT HALOYSIT VÀ GIẢI HẤP PHỤ, THU HỒI KẼM BẰNG PHƯƠNG PHÁP KẾT TỦA ĐIỆN HÓA

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Tác giả: Thị Duyên Lê, Thị Phương Thảo Lê, Văn Tiến Mai, Thế Hữu Nguyễn, Thị Kim Phương Nguyễn, Viết Hùng Nguyễn, Lê Minh Thư Vũ

Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Khoa học & Công nghệ - Trường Đại học Công nghiệp Hà Nội, 2023

Mô tả vật lý: tr.114

Bộ sưu tập: Metadata

ID: 379473

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Halloysite in Thach Khoan area, Phu Tho has a nanotube shape, has the chemical formula when hydrated is Al2Si2O5(OH)4.2H2O and when dehydrated is Al2Si2O5(OH)4with a specific surface area of 20.152m2/g. In this paper, halloysite is used to study the ability to adsorb Zn2+ ions. The influence of some factors on Zn2+ adsorption capacity and efficiency has been studied. Zn2+ adsorption efficiency and capacity reached 67.09% and 2.24mg/g under the following conditions: halloysite mass 0.6g/50mL solution, initial Zn2+ ion concentration 40mg/L, pH 5.6, exposure time 120 minutes at room temperature (25oC). The process of desorption of Zn2+ from the loaded adsorbent and recovery of metallic Zn was also studied. Zinc recovery efficiency reached 94.52% under appropriate conditions: applied current 7.5mA, electrolysis time 5 hours, loaded halloysite mass of 0.3g, temperature 60oC. The adsorption isotherm was studied based on two Langmuir and Freundlich models. The adsorption kinetics were examined using two pseudo-first-order and pseudo-second-order kinetic models.Haloysit vùng Thạch Khoán, Phú Thọ có dạng hình ống nano, có công thức hóa học khi ngậm nước là Al2Si2O5(OH)4.2H2O và khi ở dạng khử nước là Al2Si2O5(OH)4 với diện tích bề mặt riêng 20,152m2/g. Trong bài báo này, haloysit được sử dụng để nghiên cứu khả năng hấp phụ ion Zn2+. Ảnh hưởng của một số yếu tố đến dung lượng và hiệu suất hấp phụ Zn2+ đã được nghiên cứu. Hiệu suất và dung lượng hấp phụ Zn2+ đạt 67,09% và 2,24mg/g ở điều kiện: khối lượng haloysit 0,6g/50mL dung dịch, nồng độ ion Zn2+ ban đầu 40mg/L, pH 5,6, thời gian tiếp xúc 120 phút ở nhiệt độ phòng (25oC). Quá trình giải hấp phụ Zn2+ ra khỏi vật liệu hấp phụ và thu hồi Zn kim loại cũng được nghiên cứu. Hiệu suất thu hồi kẽm đạt 94,52% ở điều kiện thích hợp: cường độ dòng áp 7,5mA, thời gian điện phân 5 giờ, nhiệt độ 60oC. Đường đẳng nhiệt hấp phụ được nghiên cứu dựa trên hai mô hình Langmuir và Freundlich. Động học hấp phụ được nghiên cứu bằng hai mô hình động học giả bậc 1 và giả bậc 2.

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