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首页> 美国卫生研究院文献>Nanomaterials >Stability and Synergistic Effect of Polyaniline/TiO2 Photocatalysts in Degradation of Azo Dye in Wastewater
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Stability and Synergistic Effect of Polyaniline/TiO2 Photocatalysts in Degradation of Azo Dye in Wastewater

机译：聚苯胺/ TiO2光催化剂在降解偶氮染料中的稳定性和协同作用

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摘要

The polyaniline/TiO2 (PANI/TiO2) composite photocatalysts were prepared by the in situ chemical oxidation of aniline (An) in the presence of TiO2 particles. For this purpose, photocatalysts with different amounts of PANI polymer were prepared and analysed. Fourier-transform infrared (FT-IR) spectroscopy and thermogravimetric (TG) analysis indicated successful synthesis of the PANI polymer and its conductivity was also determined. The micrographs of field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) were used to explain the impact of the aniline amount on the aggregation process during the synthesis of the composites. The smallest size of aggregates was obtained for the photocatalysts with 15% of PANI (15PANI/TiO2) due to the formation of homogenous PANI. The photocatalytic activity of studied PANI/TiO2 photocatalysts was validated by monitoring the discoloration and mineralization of Reactive Red azo dye (RR45) in wastewater. The 15PANI/TiO2 sample presented the highest photocatalytic efficiency under ultraviolet A (UVA) irradiation, in comparison to pure TiO2. This was explained by the formation of uniformly dispersed PANI on the TiO2 particles, which was responsible for the synergistic PANI-TiO2 effect.
机译：聚苯胺/ TiO2（PANI / TiO2）复合光催化剂是通过在TiO2颗粒存在下对苯胺（An）进行原位化学氧化制备的。为此目的，制备并分析了具有不同量PANI聚合物的光催化剂。傅里叶变换红外（FT-IR）光谱和热重（TG）分析表明成功合成了PANI聚合物，并确定了其电导率。场发射扫描电子显微镜（FE-SEM）和透射电子显微镜（TEM）的显微照片用于解释复合材料合成过程中苯胺量对聚集过程的影响。由于均质PANI的形成，对于含15％PANI（15PANI / TiO2）的光催化剂，获得的聚集体尺寸最小。通过监测活性红偶氮染料（RR45）在废水中的变色和矿化，验证了所研究PANI / TiO2光催化剂的光催化活性。与纯TiO2相比，15PANI / TiO2样品在紫外线A（UVA）照射下具有最高的光催化效率。这可以通过在TiO2颗粒上形成均匀分散的PANI来解释，这是PANI-TiO2协同效应的原因。

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