Analyzing the adsorptive behavior of Amoxicillin on four Zr-MOFs nanoparticles: Functional groups dependence of adsorption performance and mechanisms

Lin Liu; Wei Cui; Cong Lu; Abbas Zain; Wei Zhang; Genxiang Shen; Shuangqing Hu; Xiaoyong Qian

doi:10.1016/j.jenvman.2020.110630

Analyzing the adsorptive behavior of Amoxicillin on four Zr-MOFs nanoparticles: Functional groups dependence of adsorption performance and mechanisms

J Environ Manage. 2020 Aug 15:268:110630. doi: 10.1016/j.jenvman.2020.110630. Epub 2020 May 15.

Authors

Lin Liu¹, Wei Cui², Cong Lu³, Abbas Zain², Wei Zhang⁴, Genxiang Shen⁵, Shuangqing Hu⁵, Xiaoyong Qian⁵

Affiliations

¹ State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China.
² State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China.
³ State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China; Shangtex Architectural Design Research Institute, Shanghai 200060, China, Shanghai, 200233, China. Electronic address: 18801610931@163.com.
⁴ State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China. Electronic address: wzhang@ecust.edu.cn.
⁵ Shanghai Academy of Environmental Sciences, Shanghai, 200233, China.

PMID: 32510425
DOI: 10.1016/j.jenvman.2020.110630

Abstract

In this study, four functional Zr-MOFs (UiO-66-H, -NH₂, -NO₂, -Cl) were prepared, characterized (FESEM, XRD, BET, XPS, FT-IR) and compared to remove low-concentration Amoxicillin (AMX) from water. Then UiO-66-NH₂ was selected for further experiments due to its highest adsorption capacity (2.3 ± 0.4 mg g^-1). The adsorption process followed pseudo-second order, Langmuir and Freundlich models. With pH increasing, deprotonation of functional groups in UiO-66-NH₂ and AMX made adsorption interactions variable. The obvious spectra shift of FT-IR/XPS indicated that Lewis acid-base interaction was the main adsorption impetus; meanwhile hydrogen bonding interaction and π-π/n-π (electron-donator-acceptor) EDA interaction should be included. For Lewis acid-base interaction, the strength was controlled by percentage of amine group in UiO-66-NH₂, mainly interacting with phenolic hydroxyl group in AMX. Due to changes in charge distribution of functional groups, there existed six kinds of π-π/n-π EDA interactions and thirteen types of hydrogen/π-hydrogen bonding interactions. Additionally, electrostatic interaction and molecular attraction also contributed to the AMX adsorption. Conclusively, analysis of functional groups interactions could help to comprehend adsorption mechanisms more profoundly and exploit functional adsorbents more efficiently.

Keywords: Adsorption mechanism; Amoxicillin; Functional groups; Zr-MOFs.

MeSH terms

Adsorption
Amoxicillin
Nanoparticles*
Spectroscopy, Fourier Transform Infrared
Water Purification*

Substances

Amoxicillin