Luận án Nghiên cứu chế tạo vật liệu lưỡng chức năng hấp phụ - Xúc tác trên cơ sở oxit đồng và than hoạt tính để xử lý các chất ô nhiễm hữu cơ dễ bay hơi

Trên cơ sở các kết quả nghiên cứu của luận án, có thể rút ra các kết luận như sau: 1. Đã tổng hợp thành công hệ vật liệu lưỡng chức năng HP-XT trên cơ sở CuO x và than hoạt tính Trà Bắc với hàm lượng Cu thay đổi từ 1 đến 8% . Các kết quả phân tích đặc trưng hóa lý dựa trên các phép đo BET chỉ ra:vật liệu CuOx /AC có cấu trúc vi mao quản phát triển (Smic ~97%SBET), có diện tích bề mặt riêng lớn (~1112 m2/g), TEM, HR-TEM, TPR-H2 và hấp phụ hóa học N2O đã chỉ ra: Các cụm tâm oxit CuO x trong đó Cu ở trạng thái oxi hóa Cu2+, phân tán đều đặn cả trong mao quản và trên bề mặt ngoài của than với độ phân tán ~7,71% , diện tích bề mặt tiếp xúc ~ 3,33 m2 trên 1 g xúc tác và kích thước trung bình của các cụm tâm hoạt động ~13,49 nm. Phân tích XPS cho thấy Cu ở trạng thái oxi hóa Cu2+, không có sự tương tác bề mặt và tương tác pha giữa Cu với AC. AC có chứa các liên kết chính là C–C, C=C, C=O, C–OH và C–H. 2. Bằng phương pháp hấp phụ động đã nghiên cứu cân bằng hấp phụ và động học hấp phụ của m-xylen trên than hoạt tính. Kết quả cho thấy: sự hấp phụ m-xylen trên AC phù hợp với lý thuyết hấp phụ lấp đầy vi mao quản của DubininRaduskevich. Việc tuân theo các mô hình ba thông số Dubinin-Astakhov và Langmuir-Freundlich của cân bằng hấp phụ chỉ ra sự không đồng nhất về năng lượng giữa các tâm hấp phụ. Trong mao quản lực hấp phụ chủ yếu là lực Van der Wall, ở bề mặt ngoài, tương tác xếp chồng π-π chiếm ưu thế. Nhiệt hấp phụ đẳng lượng Qst được xác định nằm trong khoảng (51÷59 kJ/mol) và tăng theo lượng mxylen bị hấp phụ (0,3÷1,4 mmol/g) chứng minh ái lực của AC đối với m-xylen. Sự có mặt của CuO hầu như không làm thay đổi tính chất hấp phụ m-xylen của than hoạt tính

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