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首页> 美国卫生研究院文献>Scientific Reports >TiO2 decorated functionalized halloysite nanotubes (TiO2@HNTs) and photocatalytic PVC membranes synthesis characterization and its application in water treatment
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TiO2 decorated functionalized halloysite nanotubes (TiO2@HNTs) and photocatalytic PVC membranes synthesis characterization and its application in water treatment

机译：TiO2修饰的功能化埃洛石纳米管（TiO2 @ HNTs）和光催化PVC膜的合成表征及其在水处理中的应用

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In this study photocatalyst, TiO2@HNTs were prepared by  synthesizing TiO2 nanoparticles in situ on the  functionalized halloysite nanotubes (HNTs) surface. Photocatalytic PVC membrane TiO2@HNTs M2 (2 wt.%) and TiO2@HNTs M3 (3 wt.%) were also prepared. Photocatalyst TiO2@HNTs and photocatalytic PVC membranes were used to study the photocatalytic activity against the methylene blue (MB) and rhodamine B (RB) dyes in UV batch reactor. The structure and morphology of photocatalyst and photocatalytic PVC membrane were characterized by fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), transmission electron microscopy (TEM), UV-Vis spectrophotometer and photoluminescence (PL). The PL study showed that the oxygen vacancies and surface hydroxyl groups present on the surface of TiO2@HNTs act as excellent traps for charge carrier, reducing the electron-hole recombination rate.TiO2@HNTs 2 (2 wt.%) and TiO2@HNTs 3 (3 wt.%) degraded MB dye up to 83.21%, 87.47% and RB dye up to 96.84% and 96.87%, respectively. TiO2@HNT photocatalyst proved to be stable during the three consecutive cycle of photocatalytic degradation of the RB dye. TiO2@HNTs M2 and TiO2@HNTs M3 degraded MB dye up to 27.19%, 42.37% and RB dye up to 30.78%, 32.76%, respectively. Photocatalytic degradation of both the dyes followed the first-order kinetic model. Degradation product analysis was done using the liquid chromatography–mass spectrometry (LC-MS) and the results showed that the dye degradation was initiated by demethylation of the molecule. MB and RB dye degradation reaction were tested by TBA and IPA as OH* and H+ scavengers respectively. Mechanism of photocatalytic activity of TiO2@HNTs and photocatalytic PVC membrane were also explained.
机译：在这项研究中，通过在功能化埃洛石纳米管（HNTs）表面上原位合成TiO2纳米颗粒来制备TiO2 @ HNTs。还制备了光催化PVC膜TiO2 @ HNTs M2（2％wt。％）和TiO2 @ HNTs M3（3％wt。％）。用光催化剂TiO2 @ HNTs和光催化PVC膜研究了UV间歇反应器中对亚甲基蓝（MB）和若丹明B（RB）染料的光催化活性。通过傅立叶变换红外光谱（FT-IR），X射线衍射（XRD），扫描电子显微镜（SEM），能量色散X射线（EDX），透射电子显微镜表征了光催化剂和光催化PVC膜的结构和形态。 （TEM），UV-Vis分光光度计和光致发光（PL）。 PL研究表明，TiO2 @ HNTs表面的氧空位和表面羟基是电荷载流子的优良陷阱，降低了电子-空穴复合率.TiO2 @ HNTs 2（2 wt。％）和TiO2 @ HNTs 3（3wt。％）降解的MB染料分别高达83.21％，87.47％和RB染料分别高达96.84％和96.87％。 TiO2 @ HNT光催化剂在RB染料的光催化降解的三个连续循环中被证明是稳定的。 TiO2 @ HNTs M2和TiO2 @ HNTs M3分别降解MB染料高达27.19％，42.37％和RB染料高达30.78％，32.76％。两种染料的光催化降解均遵循一级动力学模型。降解产物的分析使用液相色谱-质谱（LC-MS）进行，结果表明染料降解是通过分子的脱甲基作用引发的。通过TBA和IPA分别测试MB和RB染料的降解反应为OH * 和H + 清除剂。阐述了TiO2 @ HNTs和PVC膜光催化活性的机理。

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