Jin Xuna, Lu Yao, Zhang Heyao, Ju Yuheng, Zeng Xiaodan, Li Xiang, Chen Jie, Liu Zhigang, Yu Shihua, Wang Shanshan
College of Chemical & Pharmaceutical Engineering, Jilin Institute of Chemical Technology, Jilin 132022, China.
Centre of Analysis and Measurement, Jilin Institute of Chemical Technology, Jilin 132022, China.
Nanomaterials (Basel). 2023 Jan 27;13(3):509. doi: 10.3390/nano13030509.
In order to develop a deep method for removing trace acetic acid from industrial solvents, a type of quaternary ammonium-salt-modified magnetic microspheres was developed as a potential nanoadsorbent for low-concentration acetic-acid-enhanced removal from DMAC aqueous solution. The ion-exchange magnetic microspheres (FeO@SiO@N(CH)) have been prepared by a two-step sol-gel method with N-trimethoxysilylpropyl-N, N, N-trimethylammonium chloride as functional monomer, tetraethyl orthosilicate as a cross-linking agent, FeO@SiO as a matrix. The nanocomposite is characterized by SEM, FI-IR, XRD, VSM, and XPS. Moreover, the optimization of adsorption experiments shows that the maximum adsorption capacity of nanoadsorbent is 7.25 mg/g at a concentration = 30 mg/L, adsorbent dosage = 10 mg, V = 10 mL, and room temperature. Furthermore, the saturated FeO@SiO@N(CH) achieved an efficient regeneration using a simple desorption method and demonstrated a good regeneration performance after five adsorption/desorption cycles. In addition, FeO@SiO@N(CH) was used to remove acetic acid in DMAC waste liquid; the adsorption effect is consistent with that of a nanoadsorbent of acetic acid in an aqueous solution. These results indicate that FeO@SiO@N(CH) can efficiently treat acetic acid that is difficult to remove from DMAC waste liquid.
为了开发一种从工业溶剂中去除痕量乙酸的深度方法，制备了一种季铵盐改性磁性微球，作为一种潜在的纳米吸附剂，用于从二甲基乙酰胺（DMAC）水溶液中高效去除低浓度乙酸。以N-三甲氧基硅丙基-N，N，N-三甲基氯化铵为功能单体、正硅酸乙酯为交联剂、Fe3O4@SiO2为基质，通过两步溶胶-凝胶法制备了离子交换磁性微球（Fe3O4@SiO2@N+(CH3)3）。采用扫描电子显微镜（SEM）、傅里叶变换红外光谱仪（FI-IR）、X射线衍射仪（XRD）、振动样品磁强计（VSM）和X射线光电子能谱仪（XPS）对该纳米复合材料进行了表征。此外，吸附实验优化结果表明，在浓度为30 mg/L、吸附剂用量为10 mg、体积为10 mL、室温条件下，该纳米吸附剂的最大吸附量为7.25 mg/g。此外，饱和的Fe3O4@SiO2@N+(CH3)3采用简单的解吸方法即可实现高效再生，并且在5次吸附/解吸循环后仍表现出良好的再生性能。另外，将Fe3O4@SiO2@N+(CH3)3用于去除DMAC废液中的乙酸，其吸附效果与在水溶液中对乙酸纳米吸附剂的吸附效果一致。这些结果表明，Fe3O4@SiO2@N+(CH3)3能够有效处理DMAC废液中难以去除的乙酸。
