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首页> 外文期刊>Desalination and water treatment >Adsorption of terephthalic acid and p-toluic acid from aqueous solution using metal organic frameworks: Effect of molecular properties of the adsorbates and structural characteristics of the adsorbents
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Adsorption of terephthalic acid and p-toluic acid from aqueous solution using metal organic frameworks: Effect of molecular properties of the adsorbates and structural characteristics of the adsorbents

机译：使用金属有机骨架从水溶液中吸附对苯二甲酸和对甲苯甲酸：吸附物分子性质和吸附剂结构特征的影响

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摘要

The adsorptive removal of terephthalic acid (TPA) and p-toluic acid (p-tol) by metal organic frameworks (MOF) of Cu-BTC, Fe-BTC, MIL-101(Cr) and MIL-53(Al) was investigated in this study. The influence of various factors including solution pH, contact time, and initial concentration of TPA and p-tol solutions on the adsorption behavior was evaluated. Different adsorption isotherms and kinetic models were used to fit experimental adsorption data. It was found that the Langmuir and Redlich-Peterson adsorption isotherms were adequate to represent the experimental data (R-2 > 0.97) and that the adsorption kinetics was well-represented by a pseudo-second-order kinetic model (R-2 > 0.98). The zeta potential of the four MOFs decreased with increasing pH confirming the importance of the electrostatic interactions between adsorbents and TPA (or p-tol) as well as the importance of physicochemical properties of the adsorbates and characteristics of the adsorbents. Highest adsorption capacity for TPA (non-polar) and p-tol (polar) were obtained over microporous Cu-BTC (1838.6 mg/g) and mesoporous MIL-53(Al) (1056.7 mg/g), respectively. Furthermore, adsorption studies using an industrial wastewater from a TPA production plant suggested that compared with the conventional adsorbents such as activated carbon and multiwall carbon nanotubes, MOFs (especially mesopore-types) can be used as promising adsorbents in the adsorptive removal of organic pollutants from wastewaters.
机译：研究了Cu-BTC，Fe-BTC，MIL-101（Cr）和MIL-53（Al）的金属有机骨架（MOF）对对苯二甲酸（TPA）和对甲苯甲酸（p-tol）的吸附去除在这个研究中。评估了溶液pH值，接触时间，TPA和对甲苯酚溶液的初始浓度等各种因素对吸附行为的影响。使用不同的吸附等温线和动力学模型拟合实验吸附数据。发现Langmuir和Redlich-Peterson吸附等温线足以代表实验数据（R-2> 0.97），并且吸附动力学由拟二阶动力学模型很好地表示（R-2> 0.98） ）。四个MOF的Zeta电位随pH值的升高而降低，这证实了吸附剂与TPA（或对甲苯酚）之间的静电相互作用的重要性以及吸附物的理化性质和吸附剂特性的重要性。在微孔Cu-BTC（1838.6 mg / g）和中孔MIL-53（Al）（1056.7 mg / g）上分别获得最高的TPA（非极性）和对甲苯（极性）吸附能力。此外，使用TPA生产厂的工业废水进行的吸附研究表明，与传统吸附剂（例如活性炭和多壁碳纳米管）相比，MOF（尤其是中孔型）可以用作从有机污染物中去除有机污染物的有前途的吸附剂。废水。

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