低温合成UiO-66及其吸附去除水中甲基橙性能研究
收稿日期: 2025-03-05
网络出版日期: 2025-04-16
基金资助
河北省高等学校科学技术研究项目(QN2022142);青海省科技援青重点研发与转化计划(2023-QY-211)
Study on low⁃temperature synthesis of UiO-66 and its adsorption performance for removing methyl orange from water
Received date: 2025-03-05
Online published: 2025-04-16
染料废水的高效处理是亟需解决的环境问题之一。以阴离子染料甲基橙(MO)为目标污染物,系统研究UiO-66材料的吸附性能及机理。通过溶剂热法在60、80、100 ℃下制备UiO-66-M系列材料(M为合成温度),并利用XRD、SEM、FT-IR和XPS等手段表征其结构特性。结果表明:低温合成的UiO-66-60具有较高的比表面积(1 386.6 m²/g)和较大的平均孔径(1.7 nm);同时因配体缺陷导致表面羟基密度增加,其零电荷点(pHpzc=6.8)明显高于UiO-66-80和UiO-66-100。吸附实验表明,UiO-66-60在pH=3.0、添加量为0.2 g/L时对MO的吸附量高达597.1 mg/g,优于多数文献报道的MOF基吸附剂。其吸附过程符合准二级动力学和Freundlich等温模型,表明其以多层吸附为主。机理分析表明,静电作用与π-π共轭是影响MO吸附过程的关键机制。吸附热力学分析表明,UiO-66-60对MO的吸附是自发放热过程。UiO-66-60凭借低温合成优势和高效吸附性能,可用作甲基橙染料废水处理的高效吸附剂。
刘忆贤 , 马喜龙 , 房春霞 , 谢娟 , 张志昆 , 李鹏飞 , 李正杰 , 韩继龙 . 低温合成UiO-66及其吸附去除水中甲基橙性能研究[J]. 无机盐工业, 2026 , 58(1) : 26 -36 . DOI: 10.19964/j.issn.1006-4990.2025-0108
The efficient treatment of dye wastewater is one of the urgent environmental problems that need to be addressed.Herein,the adsorption performance and mechanism of UiO-66 towards methyl orange(MO) were investigated systemically.Firstly,UiO-66-M(M represents the synthesized temperatures) were prepared by solvothermal method at 60,80 ℃,and 100 ℃,respectively.The structural and chemical properties of UiO-66-M were systematically characterized through XRD,SEM,FT-IR,and XPS measurements.Among the three UiO-66 materials,UiO-66-60 exhibited a higher specific surface area(1 386.6 m²/g) and larger average pore size(1.7 nm).Moreover,the increased ligand defects in UiO-66-60 led to a higher surface density of the hydroxyl groups,resulting in a increased point of zero charge(pHpzc=6.8) than that of UiO-66-80 and UiO-66-100.The adsorption experiments showed that UiO-66-60 achieved an exceptional MO adsorption capacity of 597.1 mg/g under optimized conditions(pH=3.0,adsorbent dosage=0.2 g/L),which was higher than that of the most reported MOF⁃based adsorbents.The adsorption process followed the pseudo⁃second⁃order kinetic model and Freundlich isotherm model,indicating that MO molecules were adsorbed onto UiO-66-60 in multilayer manner.The electrostatic interaction and π-π stacking interaction simultaneously contributed to the MO adsorption by UiO-66-60.The thermodynamic study indicated that the MO adsorption process was spontaneous and exothermic.Owing to the low⁃temperature synthesis advantage and superior adsorption performance,UiO-66-60 could sever as an efficient adsorbent for MO removal from dye wastewater.
Key words: MOFs; UiO-66; low?temperature synthesis; methyl orange; electrostatic attraction
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