Zinc oxide-mediated photocatalytic decolorization of Ponceau S in aqueous suspension by visible light

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• 作者：Muhammad Muslim (1)
  Md Ahsan Habib (1)
  Abu Jafar Mahmood (1)
  Tajmeri Selima Akhter Islam (1)
  Iqbal Mohmmad Ibrahim Ismail (2)
  
• 关键词：Nanosize ZnO ; Ponceau S (PS) dye ; Adsorption ; Photodecolorization ; Mineralization ; Inner filter effect ; Langmuir ; hinshelwood equation
• 刊名：International Nano Letters
• 出版年：2012
• 出版时间：December 2012
• 年：2012
• 卷：2
• 期：1
• 全文大小：400KB
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• 作者单位：Muhammad Muslim (1)
  Md Ahsan Habib (1)
  Abu Jafar Mahmood (1)
  Tajmeri Selima Akhter Islam (1)
  Iqbal Mohmmad Ibrahim Ismail (2)
  
  1. Department of Chemistry, University of Dhaka, Dhaka, 1000, Bangladesh
  2. The Center of Excellence in Environmental Studies, Department of Chemistry, Faculty of Science, King Abdulaziz University, Jeddah, 21589, Saudi Arabia
  
• ISSN：2228-5326

文摘

ZnO, comprising nanosize particles (approximately 40 nm) has been prepared by heating (300°C) ZnCO3, which was obtained as precipitate by mixing ZnSO4 and (NH4)2CO3 solutions. The prepared ZnO was characterized by X-ray diffraction, scanning electron microscopy (SEM), laser-induced breakdown spectroscopy, and adsorption studies. It has been used to catalyze the decolorization of Ponceau S (PS), a model diazo dye, in an aqueous suspension under visible light (I ?1.8 × 10? W cm?). This ZnO was found to be more efficient as a photocatalyst compared to pristine ZnO. ZnO samples with higher temperatures (500°C and 700°C) show less catalytic activity. SEM images show that the particle size of ZnO increases with the increase in calcined temperature of ZnO through agglomeration, resulting in a decrease in surface area. Photodecolorization of PS is affected by its and ZnO concentrations, but unaffected by the initial pH of the solutions in the range of 4 to 7. Illumination for a sufficiently long time completely mineralizes the dye, but no Zn2+ can be detected in the clear solution. Photodegradation kinetics in the ZnO suspension obeys the Langmuir-Hinshelwood equation, and some activation of the ZnO surface by light is indicated.