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首页> 外文期刊>RSC Advances >Preparation and characterization of Cu–rare earth/Al2O3 catalysts and their application in the electrochemical removal of p-nitrophenol
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Preparation and characterization of Cu–rare earth/Al2O3 catalysts and their application in the electrochemical removal of p-nitrophenol

机译：Cu-稀土/ Al2O3催化剂的制备与表征及其在硝基苯酚电化学除去的应用中的应用

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摘要

Cu and rare earth composite catalysts (Cu–rare earth/Al _(2) O _(3) ) were prepared on Al _(2) O _(3) particles using an impregnation method for the electro-catalytic oxidation of p -nitrophenol in this study. The surface topography and crystal structure of the products were characterized using scanning electron microscopy and X-ray diffraction. Results show that the Cu–rare earth/Al _(2) O _(3) particles have a beneficial effect on p -nitrophenol removal by improving the ˙OH radical generation rate, especially the Cu–Bi/Al _(2) O _(3) catalyst. The effects of the heat treatment conditions for the Cu–Bi/Al _(2) O _(3) catalyst on its electro-catalytic activity were investigated. For a temperature of 550 °C and a time of 5 h, the obtained Cu–Bi/Al _(2) O _(3) catalyst exhibited the highest p -nitrophenol removal, nearly 100% after 60 min electrolysis, and this was decreased by only 4.5% after 10 cycles. In addition, the intermediates formed during degradation were identified using high-performance liquid chromatography, and the major intermediates formed during degradation were benzoquinone, hydroquinone, catechol, p -aminophenol, phenol, maleic acid, succinic acid, and oxalic acid. On the basis of the reaction products identified, a possible degradation pathway for p -nitrophenol was proposed.
机译：使用浸渍方法对P - C催化氧化的浸渍方法制备在Al _（2）O _（3）颗粒上制备Cu和稀土复合催化剂（Cu稀土/ Al _（2）O o _（3）） - 本研究中的硝酸苯酚。使用扫描电子显微镜和X射线衍射表征产品的表面形貌和晶体结构。结果表明，Cu-稀土/ Al _（2）o _（3）颗粒通过改善OH自由基产生速率，特别是Cu-Bi / Al _（2）O具有有益的效果对硝基苯酚除去_（3）催化剂。研究了Cu-Bi / Al _（2）o _（3）催化剂对其电催化活性的热处理条件的影响。对于550℃的温度和5小时的时间，所得Cu-Bi / Al _（2）O o _（3）催化剂表现出最高的硝基苯酚去除，电解60分钟后近100％，这是10个循环后仅减少4.5％。另外，使用高效液相色谱法鉴定在降解期间形成的中间体，并且在降解期间形成的主要中间体是苯醌，氢醌，儿茶酚，P-氨基酚，苯酚，马来酸，琥珀酸和草酸。在确定的反应产物的基础上，提出了对硝基苯酚的可能降解途径。

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