Tổng hợp zeolit từ tro núi lửa (Tajogaite, Tây Ban Nha) để xử lý nước bị ô nhiễm bởi fluoride

Springer Science and Business Media LLC - Tập 31 - Trang 7058-7072 - 2023
Iker Martínez-del-Pozo1, José María Esbrí1, Luz García-Lorenzo1, Sol López-Andrés1
1Departamento de Mineralogía y Petrología, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, Madrid, Spain

Tóm tắt

Trong sự kiện phun trào của Tajogaite (2021) tại La Palma, Quần đảo Canary, một lượng lớn tro núi lửa đã tích tụ, ảnh hưởng đến môi trường địa phương và các khu vực đô thị. Trong nghiên cứu này, tro núi lửa được lấy mẫu từ các khu vực đô thị (được phân loại là chất thải đô thị (20 03 03) theo Danh mục Chất thải Châu Âu) đã được chuyển đổi thành zeolit thông qua tổng hợp thủy nhiệt ở nhiệt độ 100 °C với giai đoạn nóng chảy kiềm trước đó ở 550 °C với nước cất. Trong quá trình này, các pha zeolit mới chủ yếu là loại X và sodalite đã được xác định bằng phương pháp XRD sau 2 giờ ủ. Những zeolit này, theo thời gian ủ, cho thấy các quá trình cạnh tranh trong đó sự chuyển đổi thành sodalite phát triển sau 24 giờ như là pha chiếm ưu thế. Vật liệu zeolit tổng hợp cho thấy hàm lượng cao của các tạp chất Fe2O3 (13.70 wt%), Na2O (12.70 wt%), CaO (11.65 wt%) và TiO2 (3.89 wt%) từ tro núi lửa và NaOH được đưa vào trong phương pháp tổng hợp. Những tạp chất này mang lại cho vật liệu zeolit các khả năng lý hóa khác nhau. Việc áp dụng zeolit thu được trong một thử nghiệm hấp phụ fluoride sơ bộ với nước rửa le giàu fluoride đã được kiểm nghiệm theo một cách mới. Hiệu suất loại bỏ đạt 41.4% ở pH axit (5.77) với liều lượng 2 g L−1 vật liệu zeolit hấp phụ. Một vật liệu có giá trị gia tăng được thu được và được áp dụng một cách sơ bộ để giải quyết vấn đề phát sinh do chính tro núi lửa, cho phép tình trạng Kết thúc Chất thải và đáp ứng các mục tiêu khác nhau của các mục tiêu phát triển bền vững trong Chương trình nghị sự 2030 của Liên Hợp Quốc.

Từ khóa

#tro núi lửa #zeolit #xử lý nước #fluoride #tổng hợp thủy nhiệt

Tài liệu tham khảo

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