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Các ống nano cacbon chức năng hóa cho việc chiết xuất pha rắn phân tán và xác định ion kim loại độc hại bằng quang phổ hấp thụ nguyên tử
Tóm tắt
Một nanosorbent cho chiết xuất pha rắn phân tán đã được chế tạo bằng cách chức năng hóa các ống nano cacbon nhiều lớp với axit sulfosalicylic sau khi oxy hóa và thiol hóa, tiếp theo là trang trí bằng các hạt nano Fe3O4. Việc kết hợp các nhóm axit cacboxylic và axit sunfonic ưa nước mang lại khả năng phối trí và khả năng tiếp cận cho cadmium và chì, dẫn đến khả năng hấp thụ cao là 217,39 và 454,54 mg g−1, tương ứng. Sự trang trí bằng các hạt nano từ tính cải thiện khả năng phân tán của nó và tạo điều kiện thuận lợi cho việc tách pha rắn mà không cần quá trình ly tâm hoặc lọc tốn công sức, đây là mục tiêu độc quyền của chiết xuất pha rắn phân tán. Nanosorbent chức năng hóa đã được đặc trưng bằng FT-IR, SEM và TEM. Hành vi hấp thụ đồng nhất và đơn lớp của nanosorbent đã được xác nhận thông qua sự phù hợp rõ ràng của dữ liệu cân bằng với mô hình đồng phân Langmuir. Phương pháp phân tích được phát triển sau khi tối ưu hóa các biến thực nghiệm như pH dung dịch, thời gian hấp thụ, lượng nanosorbent, điều kiện giải hấp để thu nạp và tách cho phép sử dụng phương pháp AAS ít nhạy cảm, khả thi về kinh tế cho việc xác định từ vết do giới hạn phát hiện được cải thiện là 0,13 và 1,21 µg L−1 cho cadmium và chì, tương ứng. Các ion đồng xảy ra phổ biến trong các mẫu thực tế không được phát hiện là can thiệp cho việc xác định từ vết của phân tích. Độ chính xác tốt đã được đánh giá qua hệ số biến thiên trung bình hàng ngày là 3,02% cho cadmium và 2,29% cho chì. Độ chính xác và khả năng áp dụng của phương pháp hiện tại cho việc xác định tuần tự cadmium và chì được củng cố bởi việc phân tích vật liệu tham chiếu tiêu chuẩn và các mẫu nước môi trường từ ngành công nghiệp mạ điện, nước sông và nước máy.
Từ khóa
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