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首页> 外文期刊>Chemistry: A European journal >Polymeric adsorption of methylene blue in TiO _2 colloids-Highly sensitive thermochromism and selective photocatalysis
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Polymeric adsorption of methylene blue in TiO _2 colloids-Highly sensitive thermochromism and selective photocatalysis

机译：TiO _2胶体中亚甲基蓝的聚合物吸附-高敏热致变色和选择性光催化

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摘要

The polymeric adsorption of methylene blue (MB) on a TiO _2 surface is reported. The MB molecule on the TiO _2 surface mainly exists as the H-trimeric adsorption state, which results in the MB@TiO _2 polymeric sol. The trimeric adsorption leads to a remarkable "blueshift" of visible-light adsorption of MB. Electrostatic attraction is important for trimeric adsorption of MB on TiO _2 surfaces. The trimer-monomer equilibrium is highly sensitive on temperature changes, showing an interesting reversible thermochromism. The MB@TiO _2 polymeric sol can be photodegraded under UV illumination without destroying the equilibrium of trimer-monomer. Compared with anionic methyl orange, the TiO _2 colloid hydrosol shows highly selective photocatalysis of MB and other cationic dyes, including crystal violet, methylene green, and victoria blue B. The MB@TiO _2 polymeric sol is stable under visible-light illumination because interfacial transfer of electrons does not exist between MB and TiO _2. Three is the magic number! Methylene blue (MB) favors adsorption on TiO _2 colloid surfaces in the trimeric low-energy state (see figure) because of strong electrostatic attractions. The trimer-monomer equilibrium of MB on TiO _2 surfaces is highly sensitive to temperature changes, resulting in a reversible thermochromism. Due to highly selective adsorption, the TiO _2 colloid also shows very selective photocatalysis of MB and other cationic dyes.
机译：据报道，亚甲基蓝（MB）在TiO _2表面上的聚合物吸附。 TiO _2表面的MB分子主要以H-三聚体的状态存在，从而形成MB @ TiO _2聚合物溶胶。三聚体吸附导致MB的可见光吸附发生明显的“蓝移”。静电吸引对于MB在TiO _2表面上的三聚吸附很重要。三聚体单体平衡对温度变化高度敏感，显示出有趣的可逆热致变色现象。 MB @ TiO _2聚合物溶胶可以在紫外线照射下光降解而不会破坏三聚体的平衡。与阴离子甲基橙相比，TiO _2胶体水溶胶对MB和其他阳离子染料（包括结晶紫，亚甲基绿和维多利亚蓝B）具有高度选择性的光催化作用。MB @ TiO _2聚合物溶胶在界面可见光下稳定，因为界面MB与TiO _2之间不存在电子转移。三是魔数！亚甲基蓝（MB）由于具有很强的静电吸引力，因此倾向于在​​三聚体低能状态下吸附在TiO _2胶体表面上（见图）。 TiO _2表面上MB的三聚单体平衡对温度变化高度敏感，从而导致可逆的热致变色现象。由于高度选择性的吸附，TiO _2胶体还显示出MB和其他阳离子染料的选择性光催化作用。

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