In situ synthesis and enhanced visible light photocatalytic activities of novel PANI-g-C3N4 composite photocatalysts
In situ synthesis and enhanced visible light photocatalytic activities of novel PANI-g-C3N4 composite photocatalysts
复制标题
新型PANI-g-C3N4复合光催化剂的原位合成及其增强可见光光催化活性
DOI：
10.1039/c2jm16241e
复制
发表时间：
2012-01-01
影响因子：
--
通讯作者：
Liu, Jing
中科院分区：
文献类型：
--
作者：
Ge, Lei;Han, Changcun;Liu, Jing
采用原位沉积氧化聚合法，以石墨化氮化碳（g-C3 N4）粉末为催化剂，在冰浴中冷却，制备了不同PANI：g-C3 N4比例的聚苯胺-石墨化氮化碳（PANI-g-C3 N4）复合光催化剂。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、傅里叶变换红外光谱（FT-IR）、紫外-可见漫反射光谱（DRS）、X射线光电子能谱（XPS）和光致发光光谱（PL）等手段对复合光催化剂进行了表征。使用可见光照射的几个开-关循环进行光电化学测量。以亚甲基蓝为目标污染物，评价了新型光催化剂的光催化活性。在可见光照射下，PANI-g-C3 N4复合材料的光催化性能明显提高，远高于TiO 2（P25）。PANI和g-C3 N4之间的协同效应被发现导致改善的光生载流子分离。提出了聚苯胺提高可见光催化性能的可能机理，为进一步提高其光催化活性提供了指导。
Novel polyaniline-graphitic carbon nitride (PANI-g-C3N4) composite photocatalysts with different PANI:g-C3N4 ratios were synthesized by "in situ" deposition oxidative polymerization of aniline monomer in the presence of g-C3N4 powder cooled in an ice bath. The resulting PANI-g-C3N4 composite photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible diffuse reflection spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS) and photoluminescence spectroscopy (PL). The photoelectrochemical measurements were performed using several on-off cycles of visible light irradiation. The photocatalytic activities of the novel photocatalysts were evaluated using methylene blue as a target pollutant. The PANI-g-C3N4 composites exhibit obviously enhanced photocatalytic performance under visible light irradiation, which is much higher than that of TiO2 (P25). The synergistic effect between PANI and g-C3N4 is found to lead to an improved photo-generated carrier separation. A possible photocatalytic mechanism of PANI on the enhancement of visible light performance is proposed to guide further improvement of their photocatalytic activity.