Nghiên cứu đặc tính hóa lý và ảnh hưởng của pH đến khả năng hấp phụ ammonium, nitrite và nitrate của than sinh học từ xơ dừa

0 Người đánh giá. Xếp hạng trung bình 0

Tác giả: Anh Trần Tuấn, Anh Vũ Cao Lan, Cành Nguyễn Thị, Đức Nguyễn Tấn, Nguyễn Lữ Nguyệt Hằng, Khánh Nguyễn Minh, Niệm Phạm Thị Ái, Nguyễn Ngọc Phi, Võ Thị Minh Thảo

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí khoa học Đại học Mở Thành phố Hồ Chí Minh - Kỹ thuật và Công nghệ, 2023

Mô tả vật lý: tr.45793

Bộ sưu tập: Metadata

ID: 339071

Thêm vào giỏ Liên kết toàn văn

Mục tiêu của nghiên cứu này là xác định các tính chất hóa lý và ảnh hưởng của pH đến khả năng hấp phụ ammonium, nitrite và nitrate của than sinh học từ xơ dừa từ đó hướng đến làm vật liệu lọc trong xử lý nước thải. Nghiên cứu sử dụng các phương pháp thường quy trong xác định hiệu suất tạo than, độ tro, khối lượng riêng, pH, EC và phân tích cấu trúc vật liệu bằng SEM, BET, FTIR và XRD. Đồng thời, xác định ảnh hưởng của pH đến khả năng hấp phụ các hợp chất nitrogen trong xơ dừa thông qua hiệu suất hấp phụ. Kết quả cho thấy than sinh học từ xơ dừa có độ giữ nước khá lớn 503.87 ± 36.44%, diện tích bề mặt riêng đạt 378.41 m2/g
trên bề mặt than có nhiều lỗ rỗng, độ xốp cao với kích thước lỗ rỗng hấp phụ và giải hấp phụ trung bình đạt 0.118nm và 0.121nm và có các nhóm chức O-H, C = O, -CH, C = C thuận lợi cho cơ chế hấp phụ hóa học. Than sinh học xơ dừa có pHPZC là 5.2 và có cấu trúc carbon vô định hình. Giá trị pH để hấp phụ tốt ammonium là 8 và nitrite, nitrate là 2 với hiệu suất hấp phụ lần lượt là 40%, 99.78% và 99.11% từ đó hướng đến tối ưu hóa quá trình loại bỏ các hợp chất nitrogen trong môi trường.The objective of this study is to determine the physico-chemical properties and the influence of pH on the ammonium, nitrite, and nitrate adsorption capacity of coconut coir biochar, to be used as a filtration material in water treatment. The study used conventional methods to determine the biochar yields, total ash, bulk density, pH, and EC. The material structure was analyzed by SEM, BET, FTIR, and XRD. At the same time, the impact of pH on the adsorption capacity of nitrogen compounds in coconut fiber biochar was determined through adsorption efficiency. As a result, the water holding capacity and the specific surface area are about 503.87 ± 36.44% and 378.41 m2/g respectively. The average adsorption and desorption pore sizes are 0.118nm and 0.121nm. There are functional groups O-H, C = O, -CH, C = C that helped enhance chemical adsorption. The coconut coir biochar has a pHPZC of 5.2 and an amorphous carbon structure. The pH value for good adsorption of ammonium, nitrite, and nitrate are 8, 2 with the adsorption efficiency of about 40%, 99.78%, and 99.11%, respectively, thereby aiming to optimize the removal of nitrogen compounds in the environment.

1. Đọc trực tuyến

1. Đọc trực tuyến

Tạo bộ sưu tập với mã QR