Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 234, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2020.118270
Keywords
Methylene blue; Methyl red; Organic pollutant; Zr-based metal-organic framework; Layer double hydroxide (LDH); Co-Fe-LDH@UiO-66-NH2 nanocomposite; Water treatment
Categories
Funding
- University of Zabol [UOZ-GR-9517-1]
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In this study, a new efficient adsorbent of Co-Fe-layered double hydroxides@metal-organic framework (Co-Fe-LDH@UiO-66-NH2) was synthesized and used for extraction of methylene blue (MB) and methylene red (MR) from water samples prior to their determination by UV-Vis spectrophotometer. The adsorbent was characterized by Fourier Transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM), Energy Dispersive XRay (EDX), X-ray Diffraction (XRD), and Brunauer-Emmett-Teller (BET) analyses. The impact of various parameters such as pH of the aqueous phase, extraction time, amount of adsorbent, type and volume of eluent solvent, desorption time, and sample volume were studied. The maximum extraction recovery was obtained at an optimized pH 8.0 and extraction time 10.0 min. The adsorption process was fitted by the Langmuir model with a maximum adsorption capacity of 555.62 mg/g and 588.2 mg/g, respectively, for MB and MR. Under optimum conditions, the limit of detection (LOD) for MB was 0.7 mu gL(-1) and 0.9 mu gL(-1) for MR. Furthermore, the Co-Fe-LDH@UiO-66-NH2 composite showed high efficiency for the removal of the analytes from environmental water samples. (C) 2020 Elsevier B.V. All rights reserved.
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