Lu Jinrong, Li Zihan, An Weijia, Liu Li, Cui Wenquan
College of Chemical Engineering, Hebei Key Laboratory for Environment Photocatalytic and Electrocatalytic Materials, North China University of Science and Technology, Tangshan 063210, China.
Nanomaterials (Basel). 2019 Sep 15;9(9):1321. doi: 10.3390/nano9091321.
Metal-free porphyrin with good planarity is beneficial to π-π stack interactions, which promotes electron coupling and the separation and transfer of photogenerated carriers. It is necessary to develop metal-free porphyrin-based photocatalysts and exploit the photocatalytic mechanism. Herein, metal-free porphyrin (5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin, TCPP) was self-assembled through an acid-based neutralization reaction and mixing dual-solvents under surfactants to form different aggregates. Morphology structures, optical and optoelectronic properties of the TCPP aggregates were characterized in detail. TCPP self-assemblies showed higher photocatalytic activities for the degradation of phenol under visible light than untreated TCPP powders, and the aggregates of nanorods formed through the acid-based neutralization reaction in the presence of hexadecyl trimethyl ammonium bromide (CTAB) possessed 2.6 times more activity than the nanofiber aggregates formed through mixing dual-solvents. It was proved that self-assembly methods are crucial for controlling the aggregation of porphyrins to form different aggregations, which have a profound impact on the photocatalytic activity.
具有良好平面性的无金属卟啉有利于π-π堆积相互作用，促进电子耦合以及光生载流子的分离与转移。开发基于无金属卟啉的光催化剂并探索其光催化机理很有必要。在此，通过酸碱中和反应并在表面活性剂存在下混合双溶剂，使无金属卟啉（5,10,15,20-四（4-羧基苯基）卟啉，TCPP）自组装形成不同的聚集体。详细表征了TCPP聚集体的形态结构、光学和光电性质。TCPP自组装体在可见光下对苯酚降解表现出比未处理的TCPP粉末更高的光催化活性，并且在十六烷基三甲基溴化铵（CTAB）存在下通过酸碱中和反应形成的纳米棒聚集体的活性比通过混合双溶剂形成的纳米纤维聚集体高2.6倍。事实证明，自组装方法对于控制卟啉的聚集以形成不同聚集体至关重要，这对光催化活性有深远影响。
