Abstract In this study, functionalized-MWCNTs with 3-aminopropyltriethoxysilane (APTES) loaded titania nanoparticles (MWCNTs-APTES-TiO2) were prepared to investigate their physicochemical properties and photocatalytic activity for methyl orange (MO) degradation. The TiO2 nanoparticles, functionalized-MNCNT and composite powders were characterized by XRD, raman, and TEM. The results obtained proved that titania (TiO2) nanoparticles was successfully loaded on APTES-MWCNTs. For application, MWCNTs-APTES-TiO2 composites were used as photocatalyst for degradation of methyl orange (MO) in aqueous solution under UV light irradiation and the result shows that 87% MO was degraded after 180 min. Kinetic analysis indicated that photocatalytic degradation of MO solution by MWCNTs-APTES-TiO2 obeyed second-order kinetic model (R2 > 0.95), supported by half-life equations and graph. Because of the presence of carbon nanotubes accelerated the degradation of methyl orange due to inhibition of electron-hole recombination, the formation of additional hydroxyl radicals and functional groups of the latter had an inhibitory effect on the degradation of methyl orange. This study suggested the MWCNTs-APTES-TiO2 nanocomposite has considerable potential as environmental photocatalyst due to higher degradation rate as compared to bare TiO2.

中文翻译：

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负载TiO 2 纳米粒子的APTES功能化MWCNTs复合材料的理化性质及其光催化活性的动力学研究

摘要 在本研究中，制备了负载有 3-氨基丙基三乙氧基硅烷 (APTES) 的二氧化钛纳米粒子 (MWCNTs-APTES-TiO2) 的功能化 MWCNTs，以研究其理化性质和光催化降解甲基橙 (MO) 的活性。TiO2 纳米颗粒、功能化的 MNCNT 和复合粉末通过 XRD、拉曼和 TEM 进行了表征。获得的结果证明二氧化钛（TiO2）纳米粒子成功地负载在APTES-MWCNTs上。在应用中，MWCNTs-APTES-TiO2 复合材料用作光催化剂，在紫外光照射下降解水溶液中的甲基橙（MO），结果表明 180 分钟后降解了 87% 的 MO。动力学分析表明，MWCNTs-APTES-TiO2光催化降解MO溶液符合二级动力学模型（R2>0.95），由半衰期方程和图表支持。由于碳纳米管的存在抑制了电子-空穴复合，加速了甲基橙的降解，形成额外的羟基自由基和后者的官能团对甲基橙的降解有抑制作用。该研究表明，与裸 TiO2 相比，MWCNTs-APTES-TiO2 纳米复合材料具有更高的降解率，因此具有作为环境光催化剂的巨大潜力。