Laboratorio de Fisicoquímica de Superficies, DETEMA, Facultad de Química, Universidad de la República, Gral. Flores 2124, CC 1157, CP 11800, Montevideo, Uruguay.
INTEC, Universidad Nacional del Litoral-CONICET, Ruta Nacional No.168, Km 0, Santa Fe, Argentina.
Environ Sci Pollut Res Int. 2019 May;26(13):12720-12730. doi: 10.1007/s11356-019-04762-6. Epub 2019 Mar 16.
A regional raw clay was used as the starting material to prepare iron-pillared clays with different iron contents. The catalytic activity of these materials was tested in the heterogeneous photo-Fenton process, applied to the degradation of 2-chlorophenol chosen as the model pollutant. Different catalyst loads between 0.2 and 1.0 g L and pH values between 3.0 and 7.0 were studied. The local volumetric rate of photon absorption (LVRPA) in the reactor was evaluated solving the radiative transfer equation applying the discrete ordinate method and using the optical properties of the catalyst suspensions. The photonic and quantum efficiencies of the 2-chlorophenol degradation depend on both the catalyst load and the iron content of the catalyst. The higher values for these parameters, 0.080 mol Einstein and 0.152 mol Einstein, respectively, were obtained with 1.0 g L of the catalyst with the higher iron content (17.6%). For the mineralization process, photonic and quantum efficiencies depend mainly on the catalyst load. Therefore, it was possible to employ a natural and cheap resource from the region to obtain pillared clay-based catalysts to degrade organic pollutants in water.
一种区域性的天然粘土被用作起始原料，制备具有不同铁含量的铁柱撑粘土。这些材料的催化活性在非均相光芬顿过程中进行了测试，用于降解选择的模型污染物 2-氯苯酚。研究了不同催化剂负载量（0.2-1.0 g/L）和 pH 值（3.0-7.0）。通过应用离散坐标法求解辐射传递方程，并使用催化剂悬浮液的光学性质，评估了反应器中的局部体积光子吸收速率（LVRPA）。2-氯苯酚降解的光子和量子效率取决于催化剂负载量和催化剂的铁含量。这些参数的较高值，分别为 0.080 mol Einstein 和 0.152 mol Einstein，是用负载量较高（17.6%）的 1.0 g/L 催化剂获得的。对于矿化过程，光子和量子效率主要取决于催化剂负载量。因此，有可能利用该地区的天然和廉价资源获得基于柱撑粘土的催化剂，用于降解水中的有机污染物。
