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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Study of Adsorption of Water-Soluble Porphyrin at Glass-Solution Interface in the Presence of Cationic Surfactant Admincelles by Means of Total Internal Reflection Spectroscopy
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Study of Adsorption of Water-Soluble Porphyrin at Glass-Solution Interface in the Presence of Cationic Surfactant Admincelles by Means of Total Internal Reflection Spectroscopy

机译：全内反射光谱法研究阳离子表面活性剂存在下水溶性卟啉在玻璃-溶液界面的吸附

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摘要

Total internal reflection (TIR) spectra was measured in the visible region at an interface between glass and an aqueous solution of 1.00 * 10~(-6) mol dm ~(-3) 5,10,15,20-tetraphenylporphyrintetrasulfonic acid (TPPS) in the presence of admicelles of cetyltrimethylammonium bromide (CTAB). Comparison of the TIR spectra with transmission spectra of TPPS solutions with different CTAB concentrations revealed that the deprotonated ions, TPPS~(-4), are simultaneously absorbed at the interface as two complexes with TPPS~(-4)/CTA~+ ratios of 1:4 and 1:7. Interfacial concentration of the 1:7 complex were estimated by using a linear relation between the absorbance and the interfacial concentration derived from a theory of TIR spectroscopy. The concentration data indicated that the adsorption of TPPS hardly occurs below pH 3, is saturated at pHs between 4 and 6, and continuously decrease above pH 6. Assuming an aggregative structure of the admicelle, the pH dependence of the adsorption was mathematically treated with a model including the dissociation, complex formation, and adsorption equilibria.
机译：在玻璃和1.00 * 10〜（-6）mol dm〜（-3）5,10,15,20-四苯基卟啉四磺酸（TPPS）水溶液之间的可见区域测量全内反射（TIR）光谱）在十六烷基三甲基溴化铵（CTAB）的存在下存在。 TIR光谱与不同CTAB浓度的TPPS溶液的透射光谱的比较表明，去质子化的离子TPPS〜（-4）以TPPS〜（-4）/ CTA〜+比值的两种络合物的形式同时在界面处被吸收。 1：4和1：7。通过使用从TIR光谱学理论得出的吸光度和界面浓度之间的线性关系，可以估算1：7复合物的界面浓度。浓度数据表明TPPS的吸附在pH低于3时几乎不发生，在pH介于4到6之间时饱和，并且在pH高于6时不断降低。假定该原子团具有聚集结构，则用pH值对吸附的pH依赖性进行数学处理。该模型包括解离，复合物形成和吸附平衡。

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