Nath Sudip, Ghosh Sujit Kumar, Panigrahi Sudipa, Pal Tarasankar
Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2005 Jul;61(9):2145-51. doi: 10.1016/j.saa.2004.08.013.
In this report, selenious acid (H2SeO3) has been exploited to study the decolorization of a cationic dye, dimethylmethylene blue (DMMB) with UV-light. Micelles have effectively been employed as organized media to promote the rate of decolorization of the dye molecules. Micellar catalysis has been explained as a consequence of electrostatic, hydrophobic and charge transfer interactions. It has also been shown that strong charge transfer and electrostatic interaction lead to an appreciable enhancement of the reaction rate in micelle, whereas, weak hydrophobic interaction is of marginal importance. Existence of monomer-dimer equilibrium for the dye molecules under certain selective environments has been identified spectrophotometrically. Then the shift of dimer-monomer equilibrium of the dye has been successfully studied in aqueous and micellar environments exploiting photodecolorization process for the dye in solution. 'Salting-in' and 'salting-out' agents were introduced into the reaction mixture to examine the viability of the dye decolorization process for dye contaminated water samples.
在本报告中，利用亚硒酸（H2SeO3）研究了阳离子染料二甲基亚甲基蓝（DMMB）在紫外光作用下的脱色情况。胶束已被有效地用作有序介质来提高染料分子的脱色速率。胶束催化被解释为静电、疏水和电荷转移相互作用的结果。研究还表明，强电荷转移和静电相互作用导致胶束中反应速率显著提高，而弱疏水相互作用的重要性不大。通过分光光度法确定了在特定选择性环境下染料分子单体 - 二聚体平衡的存在。然后，利用溶液中染料的光脱色过程，成功研究了染料在水性和胶束环境中二聚体 - 单体平衡的移动。将“盐溶”和“盐析”试剂引入反应混合物中，以检验染料脱色过程对受染料污染水样的可行性。
