Iron-pillared clays as catalysts for dye removal by the heterogeneous photo-Fenton technique
Iron-pillared clays as catalysts for dye removal by the heterogeneous photo-Fenton technique
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DOI：
10.1007/s11144-013-0593-y
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发表时间：
2013-06
期刊：
影响因子：
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通讯作者：
M. A. León;M. Sergio;J. Bussi
中科院分区：
文献类型：
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作者：
M. A. León;M. Sergio;J. Bussi
研究了铁柱蒙脱土在非均相光芬顿过程中对亚甲基蓝水溶液变色的催化活性。使用两种不同尺寸的粘土骨料部分制备催化剂，其范围在 250 μm 以下和 250–450 μm 范围内。使用了 400 和 600 °C 两种煅烧温度。通过热重分析、氮吸附等温线、元素分析、X射线衍射和铁含量对固体进行表征。发现从更细的粘土聚集体和最低的煅烧温度获得的固体具有更高的比表面积和比孔体积。在类光芬顿条件下，该催化剂还表现出最高的催化活性，在 pH 3.0 和 5.6 以及 H2O2 浓度在 5 至 20 mM 范围内时，催化活性几乎保持不变。观察到的催化性能差异可以根据催化剂的铁含量和结构特性来解释。无法检测到铁离子从催化剂中浸出。因此，这些催化剂有望在染料废水处理中具有长期稳定性。
The catalytic activity of iron pillared montmorillonitic clays in the discoloration of methylene blue aqueous solutions by the heterogeneous photo-Fenton process was studied. Catalysts were prepared using two different-sized aggregate fractions of the clay, ranging below 250 μm and within the range of 250–450 μm. Two calcination temperatures, 400 and 600 °C, were used. The solids were characterized by thermo-gravimetric analysis, nitrogen adsorption isotherms, elemental analysis, X-ray diffraction and iron content. A higher specific surface area and specific pore volume were found for the solid obtained from the finer aggregates of the clay and the lowest calcination temperature. Under photo-Fenton like conditions, this catalyst also displayed the highest catalytic activity which remained practically the same at pHs 3.0 and 5.6 and for H2O2concentrations in the range from 5 to 20 mM. The observed differences in catalytic performance can be explained on the basis of the catalysts’ iron content and textural properties. Leaching of iron ions from the catalysts could not be detected. Long term stability for dye waste water treatment could thus be expected for these catalysts.