Visible-light activation of TiO2 by dye-sensitization for degradation of pharmaceutical compounds†,Photochemical & Photobiological Sciences

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Visible-light activation of TiO2 by dye-sensitization for degradation of pharmaceutical compounds†
Photochemical & Photobiological Sciences ( IF 2.7 ) Pub Date : 2018-11-20 00:00:00 , DOI: 10.1039/c8pp00270c
Jennyfer Diaz-Angulo _{1,

2,

3,

4} , Islen Gomez-Bonilla _{1,

2,

3,

4} , Christian Jimenez-Tohapanta _{1,

2,

3,

4} , Miguel Mueses _{5,

6,

7,

8,

9} , Maria Pinzon _{1,

2,

3,

4} , Fiderman Machuca-Martinez _{1,

2,

3,

4}

Affiliation

This work reports the improvement in the photon absorption and degradation of acetaminophen (ACF) and diclofenac (DFC) by photosensitizing TiO₂ with two types of dyes Eosin Y (Ey) and Rhodamine B (RhB). Experimental tests were carried out in a solar simulator for three hours for different systems and both pollutants. The influences of the TiO₂ concentration (100, 200 and 800 mg L⁻¹) and the catalyst–dye ratio (2%, 5% and 10%) were investigated. The degradation of the compounds was higher in the presence of TiO₂-Ey compared to the TiO₂-RhB and TiO₂ for both pharmaceutical compounds, which was attributed to the anionic nature of Ey. DFC total degradation was achieved using 100 mg L⁻¹ of catalyst loading and 10% of catalyst–dye ratio and the highest ACF degradation (71%) was obtained at 800 mg L⁻¹ of catalyst loading and 5% of catalyst–dye ratio. The photon absorption was studied for both dyes using the six-flux absorption scattering model (SFM) for estimating the LVRPA (local volumetric rate of photon absorption). This was done by modifying the apparent optical thickness equation. It was found that the presence of dye in the photocatalytic systems considerably increases the LVRPA. The rate coefficients for the degradation of pharmaceutical compounds in the presence of the organic dyes were also obtained.

中文翻译：

染料敏化作用下的TiO ₂可见光活化，以降解药物化合物†

这项工作报告了通过使用两种类型的染料曙红Y（Ey）和若丹明B（RhB）对TiO ₂光敏来改善对乙酰氨基酚（ACF）和双氯芬酸（DFC）的光子吸收和降解。在太阳能模拟器中针对不同的系统和两种污染物进行了三个小时的实验测试。研究了TiO ₂浓度（100、200和800 mg L ^-1）和催化剂与染料的比率（2％，5％和10％）的影响。化合物的降解是在TiO 2的存在更高₂相比在TiO -Ey ₂ -RhB和TiO ₂两种药物化合物，这归因于EY的阴离子性质。使用100 mg L可以实现DFC的总降解^-1催化剂的装载和催化剂的染料比为10％，最高ACF降解（71％）的在800毫克的L得到^-1催化剂载量和催化剂染料比率5％。使用六通量吸收散射模型（SFM）研究了两种染料的光子吸收，以估计LVRPA（光子吸收的局部体积率）。这是通过修改视在光学厚度方程式完成的。发现在光催化体系中染料的存在大大增加了LVRPA。还获得了在有机染料存在下药物化合物降解的速率系数。

更新日期：2018-11-20

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