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<p>In this work, two complementary synthesis routes were developed to prepare novel Ni-containing layered double hydroxide (LDH) catalysts. In Route 1, a trivalent-metal composite precursor was fabricated by compositing MIL-101(Cr) and MIL-88&#xa0;A(Fe) MOFs and subsequently converted into Ni-[MCr/MFe] LDH via Ni<sup>2+</sup> incorporation. In Route 2, Ni-MCr LDH and Ni-MFe LDH were individually derived from MIL-101(Cr) and MIL-88&#xa0;A(Fe) in the presence of Ni<sup>2+</sup> and then combined to Ni-MCr LDH/Ni-MFe LDH composite. The synthesized materials were systematically characterized and applied to meropenem (MER) removal through a combined adsorption–photocatalysis process. Catalytic performance was evaluated by varying catalyst dosage, MER initial concentration, solution pH, and reaction temperature. Under optimized conditions (50&#xa0;mg catalyst, 25 mg L<sup>−1</sup> MER, visible-light irradiation), Ni-[MCr/MFe] LDH achieved 98.1% MER degradation and maintained 93.4% efficiency after five cycles, while post-reaction XRD, FTIR, and ICP analyses confirmed structural stability, heterogeneity, and recyclability. Adsorption followed the pseudo-second-order kinetic model and Temkin isotherm, whereas photocatalytic degradation obeyed pseudo-first-order kinetics. A comprehensive and previously unreported MER degradation pathway was elucidated using HPLC–MS/MS, radical scavenger tests, intermediate identification, and literature comparison, demonstrating that Ni-[MCr/MFe] LDH is a robust, reusable, and synergistic platform for visible-light-driven remediation of persistent pharmaceutical pollutants.</p>

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Mechanistic insight into visible light photocatalytic removal of meropenem from wastewater utilizing nickel based LDH nanostructures with synergistic adsorption effects

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  • 发表日期：

    2026年5月17日

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  • Seyed Ali Hosseini,
  • Mohammad Kazemeini,
  • Alireza Mohammadi

摘要

In this work, two complementary synthesis routes were developed to prepare novel Ni-containing layered double hydroxide (LDH) catalysts. In Route 1, a trivalent-metal composite precursor was fabricated by compositing MIL-101(Cr) and MIL-88 A(Fe) MOFs and subsequently converted into Ni-[MCr/MFe] LDH via Ni2+ incorporation. In Route 2, Ni-MCr LDH and Ni-MFe LDH were individually derived from MIL-101(Cr) and MIL-88 A(Fe) in the presence of Ni2+ and then combined to Ni-MCr LDH/Ni-MFe LDH composite. The synthesized materials were systematically characterized and applied to meropenem (MER) removal through a combined adsorption–photocatalysis process. Catalytic performance was evaluated by varying catalyst dosage, MER initial concentration, solution pH, and reaction temperature. Under optimized conditions (50 mg catalyst, 25 mg L−1 MER, visible-light irradiation), Ni-[MCr/MFe] LDH achieved 98.1% MER degradation and maintained 93.4% efficiency after five cycles, while post-reaction XRD, FTIR, and ICP analyses confirmed structural stability, heterogeneity, and recyclability. Adsorption followed the pseudo-second-order kinetic model and Temkin isotherm, whereas photocatalytic degradation obeyed pseudo-first-order kinetics. A comprehensive and previously unreported MER degradation pathway was elucidated using HPLC–MS/MS, radical scavenger tests, intermediate identification, and literature comparison, demonstrating that Ni-[MCr/MFe] LDH is a robust, reusable, and synergistic platform for visible-light-driven remediation of persistent pharmaceutical pollutants.