tailieunhanh - Photocatalytic degradation of paraquat using N-Tio2/Sio2 under visible light

n the present paper, photocatalytic degradation of paraquat using N-TiO2/SiO2 with different molar ratio of titanium: nitrogen (Ti:N) under visible light was investigated. The catalyst was prepared via immersed SiO2 in N-TiO2. N-TiO2 was synthesized by sol-gel method. | Vietnam Journal of Science and Technology 55 (4C) (2017) 277-283 PHOTOCATALYTIC DEGRADATION OF PARAQUAT USING N-TiO2/SiO2 UNDER VISIBLE LIGHT Nguyen Thi Phuong Mai1, Nguyen Manh Nghia2, Nguyen Thi Hue1 1 Department of Environmental Quality Analysis, Institute of Environmental Technology, VAST, 18 Hoang Quoc Viet, Ha Noi 2 Faculty of Physics, Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Ha Noi * Email: nthue2003@; npmai82@ Received: 1 August 2017; Accepted for publication: 17 October 2017 ABSTRACT In the present paper, photocatalytic degradation of paraquat using N-TiO2/SiO2 with different molar ratio of titanium: nitrogen (Ti:N) under visible light was investigated. The catalyst was prepared via immersed SiO2 in N-TiO2. N-TiO2 was synthesized by sol-gel method. The N-TiO2/SiO2 catalyst was characterized using X-ray diffraction, UV diffuse reflectance spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy. The results from characterizations indicated that N-doped anatase TiO2 had a 20-25 nm size. Degradation of paraquat, at an initial concentration of 10 mg/L was determined by UV-Vis. Chemical oxygen demand (COD) was used for process performance. Based on the COD tests, the COD values in residual paraquat was lower than that in initial paraquat concentration after 8 hours illumination of visible light. Moreover, the experiment’s results indicated that 80% of paraquat was degraded within 8 h of illumination time. These results showed that N-TiO2/SiO2 with molar Ti:N=2:1 gives the highest degradation efficiency of paraquat under visible light. This catalyst was stable and reusable suggesting it can be applied to treat organic pollutant in water. Keywords: TiO2, photocatalyst, N dopping , paraquat. 1. INTRODUCTION Paraquat (1,1'-dimethyl-4,4'-bipyridinium dichloride ) is one of the most popular herbicide which has been used widely in the productions agriculture for control broad leaf weeds in .

• Vật lý
• Vietnam Journal of Science and Technology
• Paraquat using N Tio2 Sio2 under visible light
• Sol gel method
• The COD tests
• Molar ratio of titanium
• Journal of Science
• Journal of Technology
• Technology Management
• Science and Technology
• International integration
• Journal of Marine Science and Technology
• Present state of ocean observations and service in Vietnam
• Unmanned Aerial Vehicle
• The Vietnam Academy of Science and Technology
• Ministry of Natural Resources and Environment
• Research Organizations
• Policy Planning
• Science and Technology development
• Theory Z
• Human Resources
• Development policy of Japan
• Technology and innovation system
• STI system
• Universities of Vietnam
• Model of Scientific Research
• Social Science Research System
• Nucleotide diversity of 15 conifer species in Vietnam’ s central highland
• Highland of Vietnam
• 15 conifer species
• Species of conifers
• Journal of Vietnam Agricultural Science and Technology
• Tạp chí Khoa học Công nghệ Nông nghiệp Việt Nam
• Agro food value chain
• Trade policy Vietnam
• Vietnam’s agricultural export
• The agricultural market
• The improved upland rice technology (IURT)
• Contract farming
• Improved technology
• Ssubsequent effect
• Application of passive remote sensin
• Upward looking microwave radiometers
• Technology Institute Vietnam Academy
• Trees canopyusing ground based
• Close innovation
• Open innovation
• Technological innovation
• Mechanical engineering
• R&D Organization
• Research activity
• Modeling studies of Vietnam lemongrass essential oil extraction process
• Lemongrass essential oil
• Response surface methodology
• Box Behnken design
• Kinetics of pyrolysis reaction
• Agricultural residues in Vietnam
• Corn cob and sugarcane bagasse
• Pyrolysis or gasification
• A hopane triterpenoid
• The mycelium of isaria japonica in Vietnam
• NMR assignment for 11β
• 22 dihydroxyhopane
• Spectral data analysis
• Seawater desalination applications in Vietnam
• Potential and challenges
• Current seawater desalination plants
• The MD process including configurations
• Characteristics of elemental and organic carbon
• Different sampling locations in vietnam
• NPs in the atmosphere
• Journal of Science and Technology
• Antibiotics and pesticides in water and sediments
• Intensive shrimp farms in southern Vietnam
• Mekong Delta Vietnam
• Arge amount of antibiotics
• Chemical constituents and biological activities
• Alpinia kwangsiensis collected in Vietnam
• Methanol extract of Alpinia kwangsiensis roots
• Staphylococcus aureus and Bacillus subtilis
• Wave characteristics in east Vietnam sea
• WAM cycle 4
• East Vietnam Sea
• Wave field Typhoon
• Using benthos to evaluate the quality
• The incident caused by formosa
• The central Vietnam
• The fungal strain FBV40
• Purification and characterization of laccase involved
• The white rot fungus isolated
• Bavi forest of Vietnam
• Study of sudden ionospheric disturbances
• Low frequency receiver
• Nha Trang province
• The sudden ionospheric disturbance
• Preliminary assessment of Btex
• Indoor and outdoor air
• Residential homes in Hanoi
• Among BTEX compounds