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Investigation on the sonocatalytic degradation of methyl orange in the presence of nanometer anatase and rutile TiO"2 powders and comparison of their ... activities [An article from: Desalination]
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This digital document is a journal article from Desalination, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
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Here, the nanometer anatase and rutile titanium dioxide (TiO"2) powders were introduced to act as the sonocatalysts for the sonocatalytic degradation of methyl orange that was chosen as a model compound. The ultrasound of low power was used as an irradiation source to induce TiO"2 particles performing catalytic activity. It was found that the sonocatalytic degradation of methyl orange in the presence of nanometer TiO"2 particles was much better than ones with one fold ultrasonic irradiation in the absence of any TiO"2. Moreover, the sonocatalytic activity of the nanometer anatase TiO"2 particles was obviously higher than that of nanometer rutile TiO"2 particles, which is similar to photocatalytic degradation of organic pollutions. Although there are many factors influencing sonocatalytic degradation of methyl orange, the experimental results demonstrate that the optimal degradation effect of methyl orange can be obtained when the experimental conditions of initial methyl orange concentration of 10-20 mg/L, nanometer anatase TiO"2 adding amount of 500-750 mg/L, ultrasonic frequency of 40-60 kHz, output power of 50 W, pH = 3.0-5.0 and 40^oC within 100-120 min were adopted. In addition, the sonocatalytic activities of reused TiO"2 catalysts were also studied and found to decline gradually along with the used times. In this paper, the research on sonocatalytic kinetics also has been performed and found to follow pseudo first-order reaction. At the same time, the process of sonocatalytic degradation has been inspected by using HPLC and it was found that some intermediate products appeared. All experiments indicated that the sonocatalytic method in the presence of nanometer anatase TiO"2 powder was an advisable choice for the treatments of non- or low-transparent organic wastewaters in future.
Description:
Here, the nanometer anatase and rutile titanium dioxide (TiO"2) powders were introduced to act as the sonocatalysts for the sonocatalytic degradation of methyl orange that was chosen as a model compound. The ultrasound of low power was used as an irradiation source to induce TiO"2 particles performing catalytic activity. It was found that the sonocatalytic degradation of methyl orange in the presence of nanometer TiO"2 particles was much better than ones with one fold ultrasonic irradiation in the absence of any TiO"2. Moreover, the sonocatalytic activity of the nanometer anatase TiO"2 particles was obviously higher than that of nanometer rutile TiO"2 particles, which is similar to photocatalytic degradation of organic pollutions. Although there are many factors influencing sonocatalytic degradation of methyl orange, the experimental results demonstrate that the optimal degradation effect of methyl orange can be obtained when the experimental conditions of initial methyl orange concentration of 10-20 mg/L, nanometer anatase TiO"2 adding amount of 500-750 mg/L, ultrasonic frequency of 40-60 kHz, output power of 50 W, pH = 3.0-5.0 and 40^oC within 100-120 min were adopted. In addition, the sonocatalytic activities of reused TiO"2 catalysts were also studied and found to decline gradually along with the used times. In this paper, the research on sonocatalytic kinetics also has been performed and found to follow pseudo first-order reaction. At the same time, the process of sonocatalytic degradation has been inspected by using HPLC and it was found that some intermediate products appeared. All experiments indicated that the sonocatalytic method in the presence of nanometer anatase TiO"2 powder was an advisable choice for the treatments of non- or low-transparent organic wastewaters in future.
