Department of Chemistry, CCE, Londrina State University, Londrina, PR, Brazil.
Spectrochim Acta A Mol Biomol Spectrosc. 2010 Jan;75(1):389-93. doi: 10.1016/j.saa.2009.10.046. Epub 2009 Oct 31.
The adsorption of the diazo dye Direct Red 23 onto a zinc oxide surface at 30 degrees C in the dark was investigated. The color reduction was monitored by spectrophotometry at 503 nm. The FTIR and Raman spectra of the Direct Red 23 adsorption as a function of ZnO concentration were registered. From the PM3 semi-empirical calculations of the atomic charge density and dipole moment of the Direct Red 23 molecule, it was demonstrated that the azo dye molecule may be adsorbed onto the ZnO surface through molecule geometry modifications, enhancing the interfacial area causing a variation in the bonding frequencies.
在黑暗中于 30°C 下研究了重氮染料直接红 23 在氧化锌表面的吸附。通过分光光度法在 503nm 处监测颜色还原。记录了直接红 23 吸附随 ZnO 浓度变化的 FTIR 和拉曼光谱。通过直接红 23 分子的 PM3 半经验原子电荷密度和偶极矩计算，证明该偶氮染料分子可能通过分子几何形状改变吸附在 ZnO 表面，增加了界面面积，导致了键合频率的变化。
