Phs 1020

XRD patterns were acquired on a Panalytical X'PERT PRO X-ray diffractometer at 40 kV using Ni-filtered Cu Kα radiation (λ = 1.5406 Å). FT-IR spectra were recorded on a Shimadzu-8400S (Japan) spectrometer. The distribution and morphology of MIL-101(Cr) and POM/CFO/MIL-101(Cr) samples were analyzed via scanning electron microscopy (SEM, MIRA3 TESCAN) connected with energy-dispersive X-ray (EDX). The surface areas of the samples were investigated by N₂ adsorption isotherm via the BET procedure (Micro metrics PHS-1020, Japan). UV-visible spectra were obtained using quartz cells on a Varian Cary 100 dual-beam spectrophotometer using water as the solvent. The VSM evaluation was checked by an MDKFD vibrating magnetometer (Daneshpajoohan Co., Iran) through a high magnetic field of 10 kOe. The loading amount of POM in the composite adsorbent and the concentrations of Cr and W metals in the filtrates and solutions after recovering the adsorbent were determined by inductively coupled plasma atomic emission spectrometer (PerkinElmer ICP-AES, USA). The zeta potentials of MIL-101(Cr) and POM/CFO/MIL-101(Cr) were measured by a zeta potential analyzer (Zetasizer Nano zs90) at varying pH values.

The FT-IR spectrum was recorded using a Shimadzu-8400S (Japan) spectrometer in the wavenumber range 400–4000 cm⁻¹. Powder X-ray diffraction (PXRD) patterns were recorded using a Philips X-Pert diffractometer (Philips 8440) at 40 kV between 2.0 and 60.0 (2θ) with V-filtered Cr Kα radiation (λ = 2.289 °A). UV-vis spectra were performed on a Cary 100 Conc Varian Spectrophotometer. BET measurements were carried out using N₂ as the adsorbing gas and a surface area analyzer (Micrometrics PHS-1020, Japan). The sample in the nitrogen atmosphere was slowly heated to 200 °C for 4 h. The morphological attributes of the pure and modified magnetic nanohybrid were obtained using a scanning electron microscopy system (SEM, MIRA3 TESCAN) coupled with energy-dispersive X-ray analysis (EDX). The magnetic (VSM) measurements were performed investigated using a vibrating magnetometer MDKFD (Daneshpajooh Co., Kashan, Iran) with a maximum magnetic field of 10 kOe. Raman spectra were obtained using a Raman microscope (Senterra 2009, Germany) with 785 and 514 nm lines.

FTIR spectra were registered with a Shimadzu-8400S spectrometer (Japan) in the wavenumber range of 400–4000 cm⁻¹. Powder XRD patterns were recorded by an X-ray diffractometer under a current of 40 mA and voltage of 40 kV with Cu Kα radiation (k = 0.1542 nm). The distribution and morphology of pure MOF and magnetic nanocomposite were studied utilizing (SEM, MIRA3 TESCAN) scanning electron microscopy connected with (EDX) energy-dispersive X-ray analysis. Spectra of UV-vis were performed on a Carry 100 Conc Varian spectrophotometer. The surface area of the nanocomposites was performed by N₂ adsorption isotherm with the BET method (Micro metrics PHS-1020, Japan). The magnetic (VSM) measurement was checked by MDKFD vibrating magnetometer (Daneshpajoohan Co., Iran) via a high magnetic field of 10 kOe. The adsorption process of dyes was measured on a Varian Cary 100 spectrophotometer (USA). Raman spectra were obtained using a Raman microscope (Senterra 2009, Germany) with a 514 nm line.