DOI: https://doi.org/10.9767/bcrec.20458

Green Synthesis of Cu-BDC Nanosheets for Methylene Blue Degradation

1Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Indonesia, Jl. Lingkar Kampus Raya, Pondok Cina, Beji, Depok, Jawa Barat 16424, Indonesia

2Department of Chemistry Education, Faculty of Tarbiya and Teaching Sciences, UIN Syarif Hidayatullah, Jl. Ir. H. Juanda No. 95 Ciputat Tangerang Selatan 15412, Indonesia

Received: 30 Jul 2025; Revised: 15 Sep 2025; Accepted: 16 Sep 2025; Available online: 22 Sep 2025; Published: 26 Dec 2025.
Editor(s): Istadi Istadi
Open Access Copyright (c) 2025 by Authors, Published by BCREC Publishing Group
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Abstract

Metal Organic Frameworks (MOFs) with two-dimensional (2D) nanosheet morphology possess unique surface characteristics, making them highly favourable for photocatalytic applications. This study synthesised Cu²⁺-based MOF nanosheets using a modified three-layer method. This approach is relatively simple, energy-efficient, and qualifies as a green synthesis method. The MOFs were prepared from copper(II) nitrate trihydrate (Cu(NO₃)₂·3H₂O) as the metal precursor and 1,4-benzenedicarboxylic acid (H₂BDC) as the organic linker, aiming to evaluate their photocatalytic activity for methylene blue degradation. The resulting Cu-BDC nanosheets displayed characteristic FTIR absorption bands at 1501 and 1547 cm⁻¹ corresponding to symmetric and asymmetric C=O stretching, 1394 cm⁻¹ for C–O stretching, and peaks at 751 and 569 cm⁻¹ associated with Cu–O vibrations. The XRD analysis revealed four sharp peaks at 2θ values of 8.2°, 10.2°, 16.1°, and 34.1°, indicating good crystallinity with a calculated crystallite size of 22.03 nm, and the bandgap energy is 3.89 eV. Cu-BDC nanosheets exhibit a thin sheet morphology with elemental compositions of carbon 73.08%, oxygen 11.19%, and copper 15.73%. Cu-BDC nanosheets exhibit optimal degradation activity at pH 13, with an optimal catalyst dose of 5 mg and an initial dye concentration of 20 ppm, achieving a degradation capacity of 98.62 mg/g after 120 minutes of reaction. Copyright © 2025 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

Keywords: Green synthesis; methylene blue; Cu-BDC nanosheets

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