In this study, the self-assembly of 5,10,15,20-tetra(3,4,5-trimethoxyphenyl)porphyrin (coded as: TTOP) in the mixture of tetrahydrofuran (THF) and H2O and the photocatalytic activity of resulting self-assembled aggregates toward the degradation of organic compounds were investigated. TTOP were well dispersed as monomers in THF, however, they stacked into aggregates upon the addition of water (20–90%). Depending on the THF/H2O mixture various nanostructures were observed. Microrods with an average width of 0.62±0.22 µm and length of 10.17±2.04 µm and the sphere-like particles with diameters ranging from 0.5 to 1.2 µm were obtained in 70% water in THF. Nonetheless, the particles disappeared and rods turned to slabs with same length but much larger width (4.48±2.27 µm) as 80% water in THF was used. The particles with irregular shapes, which connected into large aggregates, were obtained at 90% water in THF. These structures exhibited significant difference in photocatalytic ability for the degradation of dye (rohdamine B, RhB and methylene blue, MB). The rate constants of RhB degradation were 4.35•10-4 min-1, 1.13•10-3 min-1, 2.63•10-3 min-1, and 3.52•10-3 min-1 for the porphyrin monomers in THF and its aggregates states obtained by mixing of 70%, 80%, and 90% water in THF, respectively. The results indicated the important role of solvent in the formation and control the structures of porphyrin aggregates, which are crucial to an effective porphyrin-based photocatalyst.

中文翻译：

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疏溶剂性超分子自组装可控制5,10,15,20-四-（3,4,5三甲氧基苯基）卟啉的纳米结构和光催化行为

在这项研究中，5,10,15,20-四（3,4,5-三甲氧基苯基）卟啉在四氢呋喃（THF）和H2O的混合物中的自组装及其光催化活性研究了自组装聚集体对有机化合物降解的作用。TTOP作为单体很好地分散在THF中，但是在加入水（20-90％）时它们堆叠成聚集体。取决于THF / H 2 O混合物，观察到各种纳米结构。在70％的THF水溶液中，获得了平均宽度为0.62±0.22 µm，长度为10.17±2.04 µm的微棒以及直径为0.5至1.2 µm的球形颗粒。尽管如此，颗粒消失了，杆变成了板，板的长度相同，但宽度更大（4.48±2.27 µm），因为使用了80％的THF水。形状不规则的粒子 在90％的水的THF中得到连接成大聚集体的聚合物。这些结构在降解染料（罗丹明B，RhB和亚甲基蓝MB）的光催化能力上表现出显着差异。卟啉单体在THF和THF中的RhB降解速率常数分别为4.35•10-4 min-1、1.13•10-3 min-1、2.63•10-3 min-1和3.52•10-3 min-1。通过分别在THF中混合70％，80％和90％的水获得其聚集态。结果表明溶剂在卟啉聚集体的形成和控制中的重要作用，这对于有效的基于卟啉的光催化剂至关重要。卟啉单体在THF和THF中的RhB降解速率常数分别为4.35•10-4 min-1、1.13•10-3 min-1、2.63•10-3 min-1和3.52•10-3 min-1。通过分别在THF中混合70％，80％和90％的水获得其聚集态。结果表明溶剂在卟啉聚集体的形成和控制中的重要作用，这对于有效的基于卟啉的光催化剂至关重要。卟啉单体在THF和THF中的RhB降解速率常数分别为4.35•10-4 min-1、1.13•10-3 min-1、2.63•10-3 min-1和3.52•10-3 min-1。通过分别在THF中混合70％，80％和90％的水获得其聚集态。结果表明溶剂在卟啉聚集体的形成和控制中的重要作用，这对于有效的基于卟啉的光催化剂至关重要。