Yang Xiuzhen, Wang Changye, Zhou Bin, Cheng Shuangchan
School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China.
J Anal Methods Chem. 2023 Aug 24;2023:9985984. doi: 10.1155/2023/9985984. eCollection 2023.
Iron-based organic frame material MIL-53 (Fe) was synthesized by the hydrothermal method with Cu incorporated to obtain bimetallic composite MIL-53 (Fe, Cu). The structure and morphology of the material were characterized by SEM, XRD, BET, FTIR, XPS, and zeta potential. The adsorption performance of MIL-53 (Fe, Cu) on methyl orange was tested under a variety of conditions, including the effects of pH and material dosage, by the static adsorption test. The results show that under the condition of pH = 7, a temperature of 30°C, and an adsorbent dosage of 20 mg, the removal rate of MIL-53 (Fe, Cu) for methyl orange can reach more than 96% within 4 h, and the maximum adsorption capacity after fitting by the thermodynamic model can reach 294.43 mg/g, showing the excellent adsorption performance of MIL-53 (Fe, Cu) on methyl orange. In addition, by exploring the adsorption mechanism of MIL-53 (Fe, Cu) on methyl orange, it is found that the adsorption of MIL-53 (Fe, Cu) on methyl orange depends on chemical adsorption, as evidenced by combining Fe and Cu in the material with methyl orange molecules to form complexes to achieve adsorption. While the specific surface area of the material had no obvious effect on adsorption, the effects of pH, temperature, and concentration were explored. At a pH of 6.5, greater adsorption occurred at higher temperatures, as determined by thermodynamic model fitting, as well as with higher initial methyl orange molecule concentration.
采用水热法合成了铁基金属有机骨架材料MIL-53(Fe)，并引入铜以获得双金属复合材料MIL-53(Fe,Cu)。通过扫描电子显微镜(SEM)、X射线衍射(XRD)、比表面积分析仪(BET)、傅里叶变换红外光谱仪(FTIR)、X射线光电子能谱仪(XPS)和zeta电位对材料的结构和形貌进行了表征。通过静态吸附试验，在多种条件下，包括pH值和材料用量的影响下，测试了MIL-53(Fe,Cu)对甲基橙的吸附性能。结果表明，在pH=7、温度30℃、吸附剂用量20mg的条件下，MIL-53(Fe,Cu)对甲基橙的去除率在4h内可达96%以上，经热力学模型拟合后的最大吸附量可达294.43mg/g，表明MIL-53(Fe,Cu)对甲基橙具有优异的吸附性能。此外，通过探究MIL-53(Fe,Cu)对甲基橙的吸附机理，发现MIL-53(Fe,Cu)对甲基橙的吸附依赖于化学吸附，材料中的铁和铜与甲基橙分子结合形成络合物以实现吸附，这证明了这一点。虽然材料的比表面积对吸附没有明显影响，但研究了pH值、温度和浓度的影响。通过热力学模型拟合确定，在pH值为6.5时，较高温度下以及较高的初始甲基橙分子浓度下会发生更大的吸附。
