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Microwave-Assisted Synthesis of trans-Cinnamic Acid for Highly Efficient Removal of Copper from Aqueous Solution.
ACS Omega ( IF 3.7 ) Pub Date : 2019-12-30 , DOI: 10.1021/acsomega.9b02720 Nancy E Dávila-Guzmán 1 , Yhoana B Medina-Almaguer 1 , Miguel A Reyes-González 1 , Margarita Loredo-Cancino 1 , Sandra Pioquinto-García 1 , David A De Haro-Del Rio 1 , Marco A Garza-Navarro 1, 2 , Eugenio Hernández-Fernández 1
ACS Omega ( IF 3.7 ) Pub Date : 2019-12-30 , DOI: 10.1021/acsomega.9b02720 Nancy E Dávila-Guzmán 1 , Yhoana B Medina-Almaguer 1 , Miguel A Reyes-González 1 , Margarita Loredo-Cancino 1 , Sandra Pioquinto-García 1 , David A De Haro-Del Rio 1 , Marco A Garza-Navarro 1, 2 , Eugenio Hernández-Fernández 1
Affiliation
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trans-Cinnamic acid was synthesized under microwave irradiation, and it was used for the removal of copper, a toxic metal found in industrial wastewater, from synthetic polluted aqueous solutions. Copper removal is more favorable at pH 5 and was enhanced by increasing the copper initial concentration, reaching a maximum uptake capacity of 389.5 mg/g, which is higher than those reported in the literature. Temperature exhibited a negligible effect on the removal of copper by trans-cinnamic acid. The isotherm equilibrium uptake data were found to be described by the Langmuir model. In addition, the study of the removal kinetics shows that the uptake of copper by trans-cinnamic acid follows pseudo-first order kinetics, and equilibrium is attained at approximately 30 min. Based on the X-ray photoelectron spectroscopy, X-ray diffraction, scanning transmission electron microscopy, and Fourier-transform infrared spectroscopy studies, a copper-cinnamic acid complex [Cu(CA)2] is formed during the removal process. The reusability of this coordination compound was investigated using HCl, HNO3, and NaOH 0.1 M as desorption eluents; HCl was capable of completely desorbing copper from [Cu(CA)2], and trans-cinnamic acid was recovered as the trans-isomer. Alternatively, the [Cu(CA)2] was used to remove octamethylcyclotetrasiloxane from gaseous streams for biogas purification, obtaining an adsorption capacity of 3.37 mg/g. These promising results demonstrate the feasibility of copper removal by trans-cinnamic acid because of its high uptake capacity and potential reusability.
中文翻译：
微波辅助合成反式肉桂酸，用于高效去除水溶液中的铜。
反式肉桂酸是在微波辐射下合成的，用于从合成污染的水溶液中去除工业废水中发现的有毒金属铜。 pH 5 时铜的去除效果更为有利，并且通过增加铜的初始浓度可增强铜的去除效果，达到最大吸收容量 389.5 mg/g，高于文献报道的值。温度对反式肉桂酸去除铜的影响可以忽略不计。发现等温平衡吸收数据是由 Langmuir 模型描述的。此外，去除动力学研究表明，反式肉桂酸对铜的吸收遵循准一级动力学，并在大约30 min时达到平衡。基于X射线光电子能谱、X射线衍射、扫描透射电子显微镜和傅里叶变换红外光谱研究，在去除过程中形成了铜-肉桂酸络合物[Cu(CA)2]。使用 HCl、HNO3 和 NaOH 0.1 M 作为解吸洗脱液研究了该配位化合物的可重复使用性； HCl能够从[Cu(CA)2]中完全解吸铜，并以反式异构体形式回收反式肉桂酸。或者，使用[Cu(CA)2]从气流中去除八甲基环四硅氧烷进行沼气纯化，获得3.37 mg/g的吸附容量。这些有希望的结果证明了反式肉桂酸去除铜的可行性，因为它具有高吸收能力和潜在的可重复使用性。
更新日期：2020-01-14
中文翻译：
微波辅助合成反式肉桂酸，用于高效去除水溶液中的铜。
反式肉桂酸是在微波辐射下合成的，用于从合成污染的水溶液中去除工业废水中发现的有毒金属铜。 pH 5 时铜的去除效果更为有利，并且通过增加铜的初始浓度可增强铜的去除效果，达到最大吸收容量 389.5 mg/g，高于文献报道的值。温度对反式肉桂酸去除铜的影响可以忽略不计。发现等温平衡吸收数据是由 Langmuir 模型描述的。此外，去除动力学研究表明，反式肉桂酸对铜的吸收遵循准一级动力学，并在大约30 min时达到平衡。基于X射线光电子能谱、X射线衍射、扫描透射电子显微镜和傅里叶变换红外光谱研究，在去除过程中形成了铜-肉桂酸络合物[Cu(CA)2]。使用 HCl、HNO3 和 NaOH 0.1 M 作为解吸洗脱液研究了该配位化合物的可重复使用性； HCl能够从[Cu(CA)2]中完全解吸铜，并以反式异构体形式回收反式肉桂酸。或者，使用[Cu(CA)2]从气流中去除八甲基环四硅氧烷进行沼气纯化，获得3.37 mg/g的吸附容量。这些有希望的结果证明了反式肉桂酸去除铜的可行性，因为它具有高吸收能力和潜在的可重复使用性。
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