Ahmadi Seyed Mohammad Matin, Larimi Afsanehsadat, Asgharinezhad Ali Akbar, Khorasheh Farhad, Ghotbi Cyrus
Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran 1458889694, Iran.
School of Engineering and Applied Sciences, Department of Chemical Engineering, Swansea University, Swansea SA1 8EN, Wales, U.K.
ACS Omega. 2024 Dec 16;9(52):51320-51336. doi: 10.1021/acsomega.4c08137. eCollection 2024 Dec 31.
We present a novel approach for enhancing photocatalytic efficiency by developing polyaniline (PANI) and polyindole (PIN)-coated TiO nanotubes (TNT) through a combination of chemical oxidation and hydrothermal processes. The PANI-PIN coating was systematically applied to both the internal and external surfaces of the nanotubes to enhance the photocatalytic active sites and optimize pollutant adsorption. The dual-coated structure enhances the interaction with pollutants, facilitating a more efficient degradation of 4-nitrophenol (4-NP) when exposed to visible light. Thorough characterization through X-ray diffraction (XRD), Fourier-transform infrared (FTIR), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), energy-dispersive X-ray (EDX), N-physisorption, transient photocurrent, diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) validated the exceptional structural and optical properties of the composite. The PANI/PIN polymer coating effectively inhibited electron-hole recombination, leading to a notable enhancement in photocatalytic performance. Among the tested composites, the formulation consisting of 75% PANI and 25% PIN demonstrated remarkable performance, achieving a degradation rate of 99.46% for 4-NP in only 120 min of exposure to visible light. The impressive efficiency stems from its extensive surface area (255.3 m/g), efficient charge separation, minimized band gap (2.77 eV), and improved light absorption. Moreover, the composite demonstrated remarkable recyclability, preserving its catalytic activity across five cycles without any decline in performance. These results demonstrate the strong potential of 75%PPTN as a promising photocatalyst for environmental remediation.
我们提出了一种通过化学氧化和水热过程相结合的方法来制备聚苯胺（PANI）和聚吲哚（PIN）包覆的TiO纳米管（TNT），以提高光催化效率。将PANI-PIN涂层系统地应用于纳米管的内外表面，以增加光催化活性位点并优化污染物吸附。这种双涂层结构增强了与污染物的相互作用，在可见光照射下促进了对4-硝基苯酚（4-NP）更有效的降解。通过X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、场发射扫描电子显微镜（FE-SEM）、透射电子显微镜（TEM）、能量色散X射线光谱（EDX）、N物理吸附、瞬态光电流、漫反射光谱（DRS）和光致发光（PL）进行的全面表征验证了该复合材料优异的结构和光学性能。PANI/PIN聚合物涂层有效地抑制了电子-空穴复合，导致光催化性能显著提高。在测试的复合材料中，由75%PANI和25%PIN组成的配方表现出卓越的性能，在仅120分钟的可见光照射下，4-NP的降解率达到99.46%。这种令人印象深刻的效率源于其较大的表面积（255.3 m/g）、有效的电荷分离、最小化的带隙（2.77 eV）和改善的光吸收。此外，该复合材料表现出显著的可回收性，在五个循环中保持其催化活性，性能没有任何下降。这些结果表明75%PPTN作为一种有前途的光催化剂用于环境修复具有巨大潜力。
