Nghiên cứu chế tạo thủy nhiệt bột nano TiO2 pha tạp La3+ , khảo sát hoạt tính xúc tác quang phân hủy chất màu xanh mêtylen dưới chiếu tia tử ngoại

Trong nghiên cứu này, với mục đích nâng cao hiệu quả xúc tác quang của TiO2, Bài viết đã nghiên cứu tổng hợp vật liệu TiO2 pha tạp La3+ với các tỷ lệ pha tạp 1%, 2,5%, 5% (mol/mol so với Ti4+) bằng phương pháp thủy nhiệt. | Nghiên cứu chế tạo thủy nhiệt bột nano TiO2 pha tạp La3+ , khảo sát hoạt tính xúc tác quang phân hủy chất màu xanh mêtylen dưới chiếu tia tử ngoại VNU Journal of Science: Natural Sciences and Technology, Vol. 35, No. 3 (2019) 95-101 Original Article Research Synthesis of La3+ Doped TiO2 Nanoparticles by Hydrothermal Method, Study on Photocatalytic Activity of Decomposition of Methylene Blue under Ultraviolet Irradiation Dang Thi Minh Hue, Nguyen Thi Tuyet Mai , Tran Van Chau, Tran Thi Thu Huyen, Nguyen Thi Lan, Ta Ngoc Dung, Huynh Dang Chinh Shool of Chemical Engineering, Hanoi University of Science and Technology, 1 Dai Co Viet, Hai Ba trung, Hanoi, Viet Nam Received 15 May 2019 Revised 13 June 2019; Accepted 20 June 2019 Abstract: In this study, with the aim of improving the photocatalytic efficiency of TiO2, we studied the synthesis of La3+ doped TiO2 (with doped rates 1%, , 5% mol/mol compared to Ti 4+) by hydrothermal method. The hydrothermal condition was set at 180 °C for 12 hours. Material characteristics were investigated by XRD, SEM and solid UV-Vis methods. The results show that, all prepared materials have a crystal particle size of about nano-meters, small and smooth ( nm). La3+ doped TiO2 samples had a shift towards longer wavelengths ( 400 500 nm) compared to non-doped TiO2 sample ( 380 nm). The band gap energy (Eg) of La3+ doped TiO2 samples was reduced to eV . The yield of MB degradation of La3+ doped TiO2 at 5% mol/mol reached the highest 93% after 60 minutes under ultraviolet irradiation. Keywords: Anatase TiO2, photocatalysis, La3+ doped TiO2, hydrothermal method, ultraviolet irradiation. _ Corresponding author. Email address: maibk73@ 95 VNU Journal of Science: Natural Sciences and Technology, Vol. 35, No. 3 (2019) 95-101 Nghiên cứu chế tạo thủy nhiệt bột nano TiO2 pha tạp .