Adsorption and degradation of multiple micropollutants with trace concentrations by porous Zr-porphyrin metal-organic frameworks with missing linker defects in water

Xianyi Gan, Xiang Li*, Bo Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Metal-organic frameworks (MOFs) are effective photocatalysts with high surface area and excellent visible light absorption. In this study, a kind of Zr-porphyrin (PCN-134) and its derivatives PCN-134(Fe) and PCN-134 (Cu) were prepared for removing six structurally diverse micropollutants with extremely low concentrations (100 μg/L). The initial adsorption rates for five selected pharmaceuticals (antipyrine (AT), sulfadimethoxypyrimidine (SSM), clofibric acid (CA), diclofenac (DF), and ibuprofen (IBU)) ranged from 174.5 μg/(g • min) to 2256.5 μg/(g • min) over PCN-134 (Cu), which is 1.2–2.5 times higher than those of PCN-134. A series of optical and photoelectric properties were studied using Mott−Schottky plots, UV–Vis diffuse reflectance spectrum (UV-DRS), and transient photocurrent intensity analysis. PCN-134 (Fe) successfully extended the visible-light absorption edges at around 750 nm. PCN-134 and PCN-134 (Fe) were favorable for generating •O2 with ECB values calculated at −1.04 eV and - 0.55 eV by Mott−Schottky plots and UV–Vis diffuse reflectance spectrum (UV-DRS). The incorporation of metals enhanced the charge separation properties of PCN-134. The transient photocurrent intensity of PCN-134 (Fe) was 3.1 times higher than that of PCN-134 (Cu). The degradation efficiency for naproxen (NPX) over PCN-134 (Fe) for antipyrine (AT) and clofibric acid (CA) was 2.4 times and 11.3 times higher than those over the pristine PCN-134. •O2 and 1O2 could be the major ROS produced, confirmed by quenching experiments and electron paramagnetic resonance (EPR) technologies. This study offers useful guidance to improve the current materials for water purification.

Original languageEnglish
Article number112444
JournalMicroporous and Mesoporous Materials
Volume349
DOIs
Publication statusPublished - 1 Feb 2023

Keywords

  • Adsorption
  • Enhancement
  • Metal-organic-framework
  • Pharmaceuticals
  • Simulated sunlight

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