在目前的调查中,MnFe2O4/ZIF-8纳米复合材料作为磁性纳米吸附剂,使用龙舌兰植物的提取物和XRD表征,FTIR,VSM,BET,FESEM,EDS映射,TEM,XPS,TPD-NH3和TGA分析。此外,为了确定其在四环素吸附过程中的效率,pH(3-9)的影响,纳米复合材料剂量(0.025-2g/L),初始污染物浓度(5-100mg/L),接触时间(5-200分钟),和温度(5-50°C)进行了研究。磁性纳米复合材料的形态特性的结果证实了该纳米吸附器的球形,平均尺寸为54±31nm。BET分析表明,用ZIF-8作为新型纳米吸附剂对MnFe2O4材料进行改性可对SBET(143.8m2/g)和VTotal(0.44cm3/g)进行出色的改性。在最佳条件下(pH=7,接触时间=120min,纳米复合材料剂量=1.5g/L,对于浓度为20mg/L的四环素,温度=20°C)为90.11%。随着温度的升高,在120分钟内,去除效率从40.46%提高到95.06%,这表明吸附反应是吸热的。此外,从朗缪尔等温线获得的数据(R2=0.958),Freundlich(R2=0.534),和Temkin(R2=0.747)表明,四环素吸附是单层的,并且在合成的磁性纳米吸附剂的均匀表面上。纳米吸附器对四环素的消除过程遵循伪二阶模型(R2=0.998)。研究干扰离子的影响也证实了吸附效率的降低。此外,对合成的磁性纳米吸附剂在四环素吸附中的可重用性的研究表明,经过八个循环,效率下降16.51%。根据结果,在这项工作中合成的磁性纳米复合材料可以是从水性环境中去除四环素的合适且经济的吸附剂。
In the current investigation, MnFe2O4/ZIF-8 nanocomposite was generated as a magnetic nanoadsorber using the extract of Dracocephalum plant and characterized by XRD, FTIR, VSM, BET, FESEM, EDS-mapping, TEM, XPS, TPD-NH3, and TGA analyses. Also, to determine its efficiency in the adsorption process of tetracycline, the effect of pH (3-9), nanocomposite dose (0.025-2 g/L), initial pollutant concentration (5-100 mg/L), contact time (5-200 min), and temperature (5-50 °C) were studied. The results of the morphological properties of the magnetic nanocomposite confirmed the spherical shape of this nanoadsorber with an average size of 54 ± 31 nm. BET analysis showed that modification of MnFe2O4 material with ZIF-8 as a new nanoadsorber leads to excellent modification of SBET (143.8 m2/g) and VTotal (0.44 cm3/g). The highest removal efficiency of tetracycline in optimal conditions (pH = 7, contact time = 120 min, nanocomposite dose = 1.5 g/L, and temperature = 20 °C for a tetracycline concentration of 20 mg/L) was 90.11%. As the temperature increased, the removal efficiency increased from 40.46% to 95.06% during 120 min, which indicates that the adsorption reaction is endothermic. In addition, the data obtained from the isotherms of Langmuir (R2 = 0.958), Freundlich (R2 = 0.534), and Temkin (R2 = 0.747) showed that the tetracycline adsorption is monolayer and on the homogeneous surface of the synthesized magnetic nanoadsorber. The elimination process of tetracycline by nanoadsorber followed the pseudo-second order model (R2 = 0.998). Investigating the effect of interfering ions also confirmed the decrease in the adsorption efficiency. Also, the investigation of the reusability of the synthesized magnetic nanoadsorber in tetracycline adsorption indicates that after eight cycles, the efficiency decreases by %16.51. According to the results, the magnetic nanocomposite synthesized in this work can be a suitable and economical adsorber for the removal of tetracycline from aqueous environments.