Khả năng tái sử dụng TiO2/g-C3N4
Việc tái sử dụng hiệu quả chất xúc tác sau phản ứng quang hóa được xem là
yêu cầu quan trọng cùng với hoạt tính xúc tác cao. Chất xúc tác đã qua sử dụng
được tách ra bằng cách nung trong không khí ở 500 oC trong 3 giờ trước khi sử
dụng lại. Hình 3.36 cho thấy sự thay đổi của hiệu suất phân hủy MB sau ba lần tái
sử dụng. Sau mỗi lần sử dụng, hiệu suất giảm khoảng 6% so với lần sử dụng trước.
Giản đồ XRD của chất xúc tác là không thay đổi, cho thấy chất xúc tác hiện tại là
ổn định và có triển vọng trong xử lý nước thải phẩm màu.
Hoạt tính quang xúc tác phân hủy một số chất màu trên TiO2/g-C3N4
Để khẳng định khả năng làm mất màu quang hóa dưới bức xạ khả kiến của
vật liệu TiO2/g-C3N4, chúng tôi cũng tiến hành thêm các thí nghiệm khảo sát với ba
chất màu hữu cơ có cấu trúc hóa học khác so với MB là Malachite Green (MG),
Methyl Blue (MyB) và Methyl Red (MR) (Hình .37). Việc đánh giá sự phân hủy
chất màu dựa vào sự thay đổi cường độ peak hấp thụ chính của MG, MyB và MR ở
(MG) = 617 nm, (MyB) = 6 7 nm và (MR) = 521 nm. Kết quả khảo
sát (Hình .38) cho thấy vật liệu TiO2/g-C3N4 thể hiện khả năng xúc tác hiệu quả
trong việc phân hủy các chất màu hữu cơ khác nhau. Hiệu suất khử màu quang hóa
các chất màu MG (chất màu cation) sau 8 phút chiếu sáng là 1 %, MyB (chất
màu anion) sau chiếu sáng 1 phút là 7,8 % và MR (chất màu trung hòa) sau 120
phút chiếu sáng là 6 , %.
                
              
                                            
                                
            
 
            
                
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 tính xúc tác tuyệt 
vời đối với phân hủy Methylene Blue trong vùng ánh sáng khả kiến. goài ra, 
TiO2/g-C3N4 cũng thể hiện sự phân hủy chất xúc tác quang hiệu quả đối với các 
thuốc nhuộm có bản chất khác nhau như Malachite Green(chất màu cation), Methyl 
Blue (chất màu anion) và Methyl Red (chất màu trung hòa). Do tính chất thân thiện 
với môi trường và khả năng tái sinh khá cao, vật liệu TiO2/g-C3N4 có tiềm năng 
trong việc xử lý nước thải chứa các chất màu hữu cơ khó phân hu . 
2. Kiến nghị 
Từ các kết quả nghiên cứu của luận án, chúng tôi rút ra một số kiến nghị như 
sau: 
- Phát triển vật liệu điện cực biến tính thành các điện cực in để có thể đo trực 
tiếp tại hiện trường. 
- Phát triển vật liệu xúc tác quang trong phân tích các hợp chất hữu cơ khó 
phân hủy. 
111 
DANH MỤC CÁC CÔNG TRÌNH CÔNG B KẾT QUẢ NGHIÊN CỨU 
C A LUẬN ÁN 
I. Tạp chí trong nước 
1. Đặng Thị Ngọc Hoa, guyễn Thị Thanh Tú (2020), ghiên cứu tổng hợp vật 
liệu TiO2/g-C3N4 làm xúc tác quang hóa phân hủy xanh methylen trong vùng ánh 
sáng khả kiến, Tạp chí úc tác và hấp phụ iệt Nam, tập , số , tr.21-26, 
20/9/2020. 
2. Đặng Thị Ngọc Hoa, Nguyễn Thị Thanh Tú, Lê Thị Kim Dung (2021), ghiên 
cứu tổng hợp vật liệu composite -67/Fe2O3/g-C3N4 và ứng dụng, Tạp chí hoa 
học và công nghệ, Trường ại học Khoa học, ại học Huế, tập 18, số 2, 2 21. 
3. Đặng Thị Ngọc Hoa, guyễn Đức Hồng (2022), Tổng hợp phức titanium 
peroxyde và khảo sát hoạt tính xúc tác của hệ TiO2/g-C3N4, Tạp chí hoa học ại 
học ế: hoa học tự nhiên, số 131-1A-2 22 (đã nhận đăng). 
II. Tạp chí quốc tế (ISI) 
4. Dang Thi Ngoc Hoa, Tran Thanh Tam Toan, Tran Xuan Mau, Nguyen Thi Vuong 
Hoan, Tran Thi Nhat Tram, Tran Duc Manh, Vo Thang Nguyen, Vu Thi Duyen, Pham 
Le Minh Thong
and Dinh Quang Khieu (2020), Voltammetric determination of 
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Science: Materials in Electronics, 26/9/2020 (SCIE, Q2, IF = 2.210). 
5. Dang Thi Ngoc Hoa, Nguyen Thi Thanh Tu, Le Van Thanh Son, Le Vu Truong 
Son, Tran Thanh Tam Toan, Pham Le Minh Thong, Dao Ngoc Nhiem, Pham Khac 
Lieu and Dinh Quang Khieu (2021), Electrochemical determination of diclofenac 
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