Characterization and Evaluation of Natural Bearing and Iron-Enriched Montmorillonitic Clay as Catalysts for Wet Oxidation of Dye-Containing Wastewaters
Characterization and Evaluation of Natural Bearing and Iron-Enriched Montmorillonitic Clay as Catalysts for Wet Oxidation of Dye-Containing Wastewaters
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DOI：
10.3390/catal12060652
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发表时间：
2022-06
期刊：
影响因子：
3.9
通讯作者：
S. Maicaneanu;David L. Henninger;C. H. Lake;Ethan Addicott;L. Olar;R. Ștefan
中科院分区：
文献类型：
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作者：
S. Maicaneanu;David L. Henninger;C. H. Lake;Ethan Addicott;L. Olar;R. Ștefan
制备天然承载（未加工和在500 °C下煅烧）和富铁（浸渍和柱撑）蒙脱石粘土样品。对所得样品进行表征（X射线衍射、傅立叶变换红外光谱、扫描电子显微镜和能量色散X射线光谱），并评价其作为催化湿式氧化亮绿色和结晶紫的催化剂。在恒温分批反应管中，在相同条件（0.5g催化剂，300 mL空气/min或0.5mL H2 O2，25 mL染料溶液，25 ℃，初始溶液pH = 6.0，持续3小时）下进行实验。使用UV-Vis光谱法（200-1100 cm-1）和总有机碳跟踪工艺演变。染料去除效率（脱色）在98和99%之间，而总有机碳去除效率计算为53-98%的范围内。铁泄漏调查表明，铁损失较高的量为使用浸渍法制备的催化剂相比，柱撑样品。
Natural bearing (raw and calcined at 500 °C) and iron-enriched (impregnation and pillaring) montmorillonitic clay samples were prepared. The obtained samples were characterized (X-ray diffraction, Fourier Transformed Infrared Spectroscopy, Scanning Electron Microscopy, and Energy Dispersive X-ray Spectroscopy) and evaluated as catalysts in catalytic wet oxidation of Brilliant Green and Crystal Violet. Experiments were conducted in the same conditions (0.5 g catalysts, 300 mL air/min or 0.5 mL H2O2, 25 mL of dye solution, 25 °C, initial solution pH = 6.0, for 3 h) in thermostated batch reaction tubes. Process evolution was followed using UV-Vis spectrometry (200–1100 cm−1) and total organic carbon. Dye removal efficiencies (decolorization) between 98 and 99% were determined, while total organic carbon removal efficiencies were calculated to be in the 53–98% range. Iron leakage investigation showed that iron is lost in higher amounts for the catalysts prepared using the impregnation method by comparison with the pillared sample.