TỔNG HỢP KHUNG HỮU CƠ-KIM LOẠI (Ti-Fe) TỪ QUẶNG ILMENITE VIỆT NAM VÀ ỨNG DỤNG TRONG XỬ LÝ NƯỚC
240 lượt xemDOI:
https://doi.org/10.54939/1859-1043.j.mst.75A.2021.17-28Từ khóa:
MIL-125(Ti); Phân hủy xúc tác quang; Rhodamine B; Quặng ilmenite.Tóm tắt
Trong bài báo này, khung hữu cơ kim loại hỗn hợp MIL(Ti-Fe) được tổng hợp bằng phương pháp thủy nhiệt. Vật liệu lai MIL(Ti-Fe) được chế tạo từ quặng ilmenit và axit 1,3,5-benzentricacboxylic ở 130 oC trong 24 giờ. Vật liệu chuẩn bị được đặc trưng bằng cách sử dụng kính hiển vi điện tử quét (SEM), nhiễu xạ tia X (XRD), quang phổ hồng ngoại (IR) và diện tích bề mặt Brunauer-Emmett-Teller (BET). Các hạt MIL(Ti-Fe) thu được có đường kính từ 0,2-1,0 mm với diện tích bề mặt BET là 85,482 m2 g-1. Để đánh giá hiệu quả phân hủy thuốc nhuộm, ảnh hưởng của các thông số chính khác nhau. pH của dung dịch thuốc nhuộm, nồng độ thuốc nhuộm ban đầu, thời gian hấp phụ và lượng chất xúc tác được khảo sát. Tốc độ phân hủy chất xúc tác quang của Rhodamine B được tìm thấy tối đa là 0,0074 phút-1 ở pH=7. Việc loại bỏ tối đa Rhodamine B thu được ở 1,0 g L-1 trong số lượng chất xúc tác. Dưới chiếu xạ ánh sáng mặt trời mô phỏng, kết quả MOFs hỗn hợp kim loại cho thấy khả năng phân hủy quang cao đối với Rhodamine với hiệu suất phân hủy xấp xỉ 99,97% sau 6 giờ. Hơn nữa, các vật liệu kết quả cũng cho thấy hành vi hấp thụ đáng kể đối với Rhodamine B với khả năng hấp phụ là 70 mg g-1.
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