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利用碳热还原电解锰渣合成沸石用于去除水溶液中的大环内酯类抗生素

Synthesis of Zeolite from Carbothermal Reduction Electrolytic Manganese Residue for the Removal of Macrolide Antibiotics from Aqueous Solution.

作者信息

Li Xuli, Zeng Yue, Chen Fangyuan, Wang Teng, Li Yixin, Chen Yuchi, Hou Haobo, Zhou Min

机构信息

School of Resource and Environment Science, Wuhan University, Wuhan 430072, China.

Hubei Environmental Remediation Material Engineering Technology Research Center, Wuhan University, Wuhan 430074, China.

出版信息

Materials (Basel). 2018 Oct 30;11(11):2133. doi: 10.3390/ma11112133.

DOI:10.3390/ma11112133
PMID:30380723
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6266068/
Abstract

Zeolite analcime (EMANA) was synthesized through the hydrothermal method by using carbothermal reduction electrolytic manganese residue (CR-EMR). The structural properties of EMANA and CR-EMR were studied using various characterization techniques. After hydrothermal synthesis, the CR-EMR became super-microporous, and the surface area increased by 4.76 times than before. Among the various synthesized zeolites, 6 h-synthesized EMANA was selected as the best adsorbent for macrolide antibiotics in aqueous solution. The adsorption performance of EMANA on the adsorption capacity was examined by using various experimental parameters, such as contact time (0⁻24 h), initial concentration (50⁻300 mg/L), temperature (30⁻50 °C) and pH (3⁻13). The experimental results were also analyzed by the Langmuir and Freundlich adsorption models, with the latter obtaining better representation. The adsorption process could be described well by the pseudo-second-order model, even under a low concentration (50 mg/L). This result suggests that the adsorption process of macrolide antibiotics is due to chemisorption. According to the Fourier Transform infrared spectroscopy (FT-IR) results, the adsorption of zeolite was mainly due to its hydroxyl group, which played an important role during the adsorption process. Moreover, EMANA is more suitable for treatment of roxithromycin (ROX) than azithromycin (AZM), because ROX has more adsorption sites for the hydroxyl group.

摘要

采用水热法，以碳热还原电解锰渣（CR - EMR）为原料合成了方沸石（EMANA）。运用多种表征技术研究了EMANA和CR - EMR的结构性质。水热合成后，CR - EMR变成了超微孔结构，比表面积比之前增加了4.76倍。在合成的各种沸石中，选择6小时合成的EMANA作为水溶液中大环内酯类抗生素的最佳吸附剂。通过各种实验参数，如接触时间（0 - 24小时）、初始浓度（50 - 300毫克/升）、温度（30 - 50℃）和pH值（3 - 13），考察了EMANA对吸附容量的吸附性能。还通过Langmuir和Freundlich吸附模型对实验结果进行了分析，结果表明后者的拟合效果更好。即使在低浓度（50毫克/升）下，吸附过程也能用准二级模型很好地描述。这一结果表明大环内酯类抗生素的吸附过程是由化学吸附引起的。根据傅里叶变换红外光谱（FT - IR）结果，沸石的吸附主要归因于其羟基，羟基在吸附过程中起重要作用。此外，EMANA对罗红霉素（ROX）的处理效果比对阿奇霉素（AZM）更好，因为ROX对羟基有更多的吸附位点。

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