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高等学校化学研究

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The effect of experimental condition and kinetic study over TiO2 in photodegradation of methylene blue

Widchaya Radchatawedchakoon, Araya Thapol and Ratchaneekorn  Wanchanthuek   

  1. The Center of Excellence for Innovation in Chemistry and department of Chemistry, Faculty of Science, Mahasarakham University, Kantarawichai District, Mahasarakham 44150, Thailand
  • 收稿日期:2013-04-19 修回日期:2013-05-28 出版日期:2013-06-13 发布日期:2013-06-13
  • 通讯作者: Ratchaneekorn Wanchanthuek E-mail:ratchapil@hotmail.com

The effect of experimental condition and kinetic study over TiO2 in photodegradation of methylene blue

Widchaya Radchatawedchakoon, Araya Thapol and Ratchaneekorn  Wanchanthuek   

  1. The Center of Excellence for Innovation in Chemistry and department of Chemistry, Faculty of Science, Mahasarakham University, Kantarawichai District, Mahasarakham 44150, Thailand
  • Received:2013-04-19 Revised:2013-05-28 Online:2013-06-13 Published:2013-06-13
  • Contact: Ratchaneekorn Wanchanthuek E-mail:ratchapil@hotmail.com

摘要：

This study was investigated the catalytic activity of TiO2 in methylene blue (MB) degradation under solar light. The reaction parameters such as reaction time, TiO2 content, temperature, pH, MB concentration and light irradiation were in attention. Then, the experimental data was analyzed to investigate the adsorption order and adsorption model. The results indicated that the optimum condition for the removal of MB was the usage of TiO2 content at 0.5 g/L, 0.60 mg/L of MB solution, temperature at 30 ° C and 60 minutes in reaction time. Moreover, it was found that the amount of MB removal was decreased when the pH and temperature increased. This was suggested that the removal process is exothermic. However, the solar light irradiation played the vital role to enhance the amount of MB removal. In the dark reaction, the ability of TiO2 in MB removal was increased when the pH increased. The kinetics study confirmed that the MB adsorption is the pseudo-second-order and the adsorption model was fitted with the Freundlich isotherm.

Abstract:

This study was investigated the catalytic activity of TiO2 in methylene blue (MB) degradation under solar light. The reaction parameters such as reaction time, TiO2 content, temperature, pH, MB concentration and light irradiation were in attention. Then, the experimental data was analyzed to investigate the adsorption order and adsorption model. The results indicated that the optimum condition for the removal of MB was the usage of TiO2 content at 0.5 g/L, 0.60 mg/L of MB solution, temperature at 30 ° C and 60 minutes in reaction time. Moreover, it was found that the amount of MB removal was decreased when the pH and temperature increased. This was suggested that the removal process is exothermic. However, the solar light irradiation played the vital role to enhance the amount of MB removal. In the dark reaction, the ability of TiO2 in MB removal was increased when the pH increased. The kinetics study confirmed that the MB adsorption is the pseudo-second-order and the adsorption model was fitted with the Freundlich isotherm.