| Photo-catalytic decolourisation of toxic dye with N-doped titania: A case study with Acid Blue 25 |
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| 作者姓名： | Dhruba Chakrabortty Susmita Sen Gupta |
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| 作者单位： | Department of Chemistry, B N College, Dhubri, Assam, India;Department of Chemistry, B N College, Dhubri, Assam, India |
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| 基金项目： | The authors are thankful to U.G.C, New Delhi for a Major Research Project grant. Authors are also thankful to Dr. C. V. V. Satyanarayana, Scientist, Catalysis Division, N. C. L., Pune, Prof. K. G. Bhattacharyya and Prof. J. N. Ganguli, Department of Chemistry, Gauhati University, Principal, B. N. College, Dhubri, Sri Goutam Kumar Sarma, Sri D. K. Kashyap for their help in various stages of this work. |
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| 摘 要： | Dyes are one of the hazardous water pollutants.Toxic Acid Blue 25,an anthraquinonic dye,has been decolourised by photo-catalysing it with nitrogen doped titania in aqueous medium.The photo catalyst was prepared from 15% TiCl 3 and 25% aqueous NH 3 solution as precursor.XRD and TEM revealed the formation of well crystalline anatase phase having particle size in the nano-range.BET surface area of the sample was higher than that of pure anatase TiO 2.DRS showed higher absorption of radiation in visible range compared to pure anatase TiO 2.XPS revealed the presence of nitrogen in N-Ti-O environment.The experimental parameters,namely,photocatalyst dose,initial dye concentration as well as solution pH influence the decolourisation process.At pH 3.0,the N-TiO 2 could decolourise almost 100% Acid Blue 25 within one hour.The influence of N-TiO 2 dose,initial concentration of Acid Blue 25 and solution pH on adsorption-desorption equilibrium is also studied.The adsorption process follows Lagergren first order kinetics while the modified Langmuir-Hinselwood model is suitably fitted for photocatalytic decolourisation of Acid Blue 25.
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| 关 键 词： | Acid Blue 25 decolourisation nitrogen-doped titania photocatalysis |
| 收稿时间： | 7/7/2012 12:00:00 AM |
| 修稿时间： | 9/4/2012 12:00:00 AM |
Photo-catalytic decolourisation of toxic dye with N-doped titania: A case study with Acid Blue 25 |
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| Dhruba Chakrabortty,Susmita Sen Gupta.Photo-catalytic decolourisation of toxic dye with N-doped titania: A case study with Acid Blue 25[J].Journal of Environmental Sciences,2013,25(5):1034-1043. |
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| Authors: | Dhruba Chakrabortty and Susmita Sen Gupta |
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| Institution: | Department of Chemistry, B N College, Dhubri, Assam, India |
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| Abstract: | Dyes are one of the hazardous water pollutants. Toxic Acid Blue 25, an anthraquinonic dye, has been decolourised by photo-catalysing it with nitrogen doped titania in aqueous medium. The photo catalyst was prepared from 15% TiCl3 and 25% aqueous NH3 solution as precursor. XRD and TEM revealed the formation of well crystalline anatase phase having particle size in the nano-range. BET surface area of the sample was higher than that of pure anatase TiO2. DRS showed higher absorption of radiation in visible range compared to pure anatase TiO2. XPS revealed the presence of nitrogen in N-Ti-O environment. The experimental parameters, namely, photocatalyst dose, initial dye concentration as well as solution pH influence the decolourisation process. At pH 3.0, the N-TiO2 could decolourise almost 100% Acid Blue 25 within one hour. The influence of N-TiO2 dose, initial concentration of Acid Blue 25 and solution pH on adsorption-desorption equilibrium is also studied. The adsorption process follows Lagergren first order kinetics while the modified Langmuir-Hinselwood model is suitably fitted for photocatalytic decolourisation of Acid Blue 25. |
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| Keywords: | Acid Blue 25 decolourisation nitrogen-doped titania photocatalysis |
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