Abstract We have performed the synthesis of TiO2-MWCNT composites focusing on the distribution of the photoactive phase on the carbon active sites existing in the MWCNTs, and its effect on the properties of the composites for the abatement of propene. We have used different approaches for the dispersion of MWCNTs during the synthesis; 1) an ultrasound bath for 5 minutes, 2) an ultrasound bath for 60 minutes, and 3) an ultrasound probe for 5 min. We observed that the incorporation of MWCNTs in the TiO2 synthesis improves the catalytic activity in the photooxidation of propene, but the best results are obtained for ultrasound probe treatment. A good dispersion of the MWCNT and an increase in the active surface area or surface oxygen functionalities of the MWCNTs are key factors to achieve improved photocatalytic activity for total propene oxidation, thus benefitting from the synergy between TiO2 and MWCNT.

中文翻译：

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用于气相丙烯光氧化的 TiO2-MWCNT 复合材料中 MWCNT 的分散效应研究

摘要 我们已经进行了 TiO2-MWCNT 复合材料的合成，重点研究了光活性相在 MWCNT 中存在的碳活性位点上的分布，及其对复合材料减少丙烯性能的影响。我们在合成过程中使用了不同的方法来分散多壁碳纳米管；1) 超声浴 5 分钟，2) 超声浴 60 分钟，和 3) 超声探头 5 分钟。我们观察到在 TiO2 合成中加入 MWCNTs 提高了丙烯光氧化的催化活性，但超声探针处理获得了最好的结果。多壁碳纳米管的良好分散和多壁碳纳米管的活性表面积或表面氧官能度的增加是提高丙烯总氧化光催化活性的关键因素，