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首页> 外文期刊>Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications >Photocatalytic oxidation of multicomponent mixtures of estrogens (estrone (E1), 17β-estradiol (E2), 17α-ethynylestradiol (EE2) and estriol (E3)) under UVA and UVC radiation: Photon absorption, quantum yields and rate constants independent of photon absorption
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Photocatalytic oxidation of multicomponent mixtures of estrogens (estrone (E1), 17β-estradiol (E2), 17α-ethynylestradiol (EE2) and estriol (E3)) under UVA and UVC radiation: Photon absorption, quantum yields and rate constants independent of photon absorption

机译：在UVA和UVC辐射下，雌激素（雌酮（E1），17β-雌二醇（E2），17α-乙炔基雌二醇（EE2）和雌三醇（E3））的多组分混合物的光催化氧化：光子吸收，量子产率和速率常数与光子吸收无关

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The kinetics of photocatalytic degradation of multicomponent mixtures of four of the most powerful endocrine disrupting chemicals (estrogens) estrone (E1), 17β-estradiol (E2), 17α-ethynylestradiol (EE2) and estriol (E3) was studied in the presence and in the absence of TiO2 (Degussa P25) suspensions. Experiments were carried out with UVA and UVC radiation in a well characterized annular photoreactor. The results were analysed in terms of a simple first-order kinetic model, but including the explicit effect of photon absorption. This was accomplished by modelling the radiation field under heterogeneous (photocatalysis) conditions and by determining the spatial distribution of the local volumetric rate of photon absorption (LVRPA) in the reactor. The Six-Flux Absorption-Scattering Model (i.e., scattered photons follow the route of the six directions of the Cartesian coordinates) using optical parameters averaged across the spectrum of the incident radiation was used to determine the LVRPA. The intrinsic reaction kinetic constants, of E1, E2, EE2 and E3, independent of reactor geometry and level of radiation absorbed within the reactor were determined under each different oxidation conditions. The quantum yields (moles of estrogens degraded per Einstein of photons absorbed) were estimated. The quantum yields under UVC-TiO2 photocatalysis (2.1 x 10~(-3) to 3.9 x 10~(-3)) are on average double the yields under UVA-TiO2 photocatalysis (1.2 x 10~(-3) to 1.8 x 10~(-3)).The established model was found to be appropriate to predict the time-dependent degradation profiles of the estrogens in multicomponent systems. Using this simple approach, intrinsic kinetic data can be obtained.
机译：在存在和存在下研究了四种最强大的内分泌破坏性化学物质（雌激素）雌酮（E1），17β-雌二醇（E2），17α-乙炔基雌二醇（EE2）和雌三醇（E3）的多组分混合物的光催化降解动力学。没有TiO2（Degussa P25）悬浮液。在特征明确的环形光反应器中对UVA和UVC辐射进行了实验。根据简单的一阶动力学模型分析了结果，但包括光子吸收的显式影响。这是通过在非均相（光催化）条件下对辐射场建模并确定反应器中光子吸收局部体积率（LVRPA）的空间分布来实现的。六通量吸收-散射模型（即，散射光子遵循笛卡尔坐标的六个方向的路径），使用入射辐射光谱上的平均光学参数确定LVRPA。在每种不同的氧化条件下，确定了E1，E2，EE2和E3的固有反应动力学常数，与反应器的几何形状和反应器内吸收的辐射水平无关。估计了量子产率（吸收的光子的每个爱因斯坦降解的雌激素的摩尔数）。 UVC-TiO2光催化下的量子产率（2.1 x 10〜（-3）至3.9 x 10〜（-3））平均是UVA-TiO2光催化下的量子产率（1.2 x 10〜（-3）至1.8 x 10〜（-3））。发现建立的模型适合预测多组分系统中雌激素的时间依赖性降解曲线。使用这种简单的方法，可以获得内在的动力学数据。

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