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Study of adsorption of methylene blue and new methylene blue in liquid-solid interface by slab optical waveguide spectroscopy |
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| Authors: | Sun Li-Xian Matsuda Naoki Takatsu Akiko Kato Kenji Okada Tatsuhiro |
| Affiliation: | aNanoarchitectonics Research Center, National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8565, Japan bDalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023 Dalian, PR China cNational Metrological Laboratory, National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8565, Japan dNational Institute of Advanced Industrial Science and Technology, Tsukuba 305-8565, Japan |
| Abstract: | A slab optical waveguide (SOWG) has been used for study of adsorption of both methylene blue (MB) and new methylene blue (NMB) in liquid–solid interface. Adsorption characteristics of MB and NMB on both bare SOWG and silanized SOWG by octadecyltrichlorosilane (ODS) were compared. Effect of pH on adsorption on MB and NMB was investigated. Binding rate constant analysis showed that both MB and NMB on bare SOWG demonstrates larger association constants than those on ODS-SOWG. Interactions of MB and NMB on bare SOWG and ODS-SOWG were analyzed by molecular mechanics calculation method. The binding energy change was in the following order: ENMB–bare > EMB–bare > ENMB–ODS > EMB–ODS. |
| Keywords: | Adsorption Methylene blue New methylene blue Slab optical waveguide spectroscopy Octadecyltrichlorosilane |
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