钛(IV)氧化物异质结构与对称阳离子聚甲基染料光催化还原亚甲基蓝

I. Kobasa, M. M. Vorobet’s, O. Sema
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摘要

对称阳离子多甲基染料2 - [(1E) -1,3,5-六三烯基-]-1 -(苯基甲基)-苯并吲哚氟化硼(D)的光谱、电化学和能量特征表明其有可能作为一种有效的氧化钛(IV)敏化剂。将染料溶液的吸收光谱与D/TiO2异质结构的反射光谱进行比较,发现染料在TiO2表面的沉积会导致吸收谱带发生色移和异色移,其值取决于该组分在异质结构(HS)中的含量。异质结构光谱的变化表明J-和h -聚集体都可能形成。循环伏安法测定了所研究的聚甲基染料的氧化和还原电位,并计算了它们在激发态下的氧化还原电位。它们已被发现足以通过电子转移到TiO2传导带致敏。测定了HS D/TiO2在亚甲基蓝还原模型反应中的光催化活性随辐照条件和染料浓度的变化。结果表明,当λ <400 nm的光照射D/TiO2异质结构时,其光催化活性在整个浓度范围内随染料含量的增加而降低。当异质结构的光被染料吸收(λ = 872 nm)照射时,染料的光催化活性在浓度为0,20 mg/g时达到最大值,然后随着浓度的增加而降低。考虑了由半导体和染料敏化剂吸收的光的作用所引起的可能的电子过程的能量。显示了使用所创建的异质结构作为具有给定光催化活性水平和扩展光敏度范围的功能材料的可能性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Photocatalytic reduction of methylene blue by the heterostructure of Titanium (IV) oxide and symmetric cationic polymethine dye
The results of the spectral, electrochemical and energy characteristics of symmetric cationic polymethine dye 2 - [(1E) -1,3,5-hexatrienyl -] - 1- (phenylmethyl)-benzindolium boron fluoride (D) indicate the possibility of its use as an effective titanium(IV) sensitizer oxide. Comparison of the absorption spectra of the dye solution and the reflectance spectra of the D/TiO2 heterostructures showed that the deposition of the dye on the TiO2 surface leads to bathochrome and hypochromic shifts of the absorption bands, the value of which depends on the content of this component in the heterostructure (HS). The obtained changes in the spectra of heterostructures indicate the possibility of formation of both J- and H-aggregates. Cyclic voltammetry determines the oxidation and reduction potentials of the investigated polymethine dye and calculates their redox potentials in the excited state. They have been found to be sufficient for sensitization by electron transfer to the TiO2 conduction band. The photocatalytic activity of HS D/TiO2 in the model reaction of methylene blue reduction depending on irradiation conditions and dye concentration has been determined. It is shown that, when irradiated with D/TiO2 heterostructures with light with λ <400 nm, their photocatalytic activity decreases with increasing dye content in the whole concentration range of the studied concentrations. When irradiated with heterostructures by light absorbed by the dye (λ = 872 nm), the photocatalytic activity increases to a maximum value at a concentration of the dye equal to 0,20 mg/g, and then decreases with increasing concentration. The energy of possible electronic processes caused by the action of light absorbed by a semiconductor and a dye-sensitizer is considered. The possibility of using created heterostructures as functional materials with a given level of photocatalytic activity and extended range of light sensitivity is shown.
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