Effective Magnetic MOFs Adsorbent for the Removal of Bisphenol A, Tetracycline, Congo Red and Methylene Blue Pollutions

Abstract

A magnetic metal−organic frameworks adsorbent (Fe3O4@MIL-53(Al)) was prepared by a typical solvothermal method for the removal of bisphenol A (BPA), tetracycline (TC), congo red (CR), and methylene blue (MB). The prepared Fe3O4@MIL-53(Al) composite adsorbent was well characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), and fourier transform infrared spectrometer (FTIR). The influence of adsorbent quantity, adsorption time, pH and ionic strength on the adsorption of the mentioned pollutants were also studied by a UV/Vis spectrophotometer. The adsorption capacities were found to be 160.9 mg/g for BPA, 47.8 mg/g for TC, 234.4 mg/g for CR, 70.8 mg/g for MB, respectively, which is superior to the other reported adsorbents. The adsorption of BPA, TC, and CR were well-fitted by the Langmuir adsorption isotherm model, while MB followed the Freundlich model, while the adsorption kinetics data of all pollutants followed the pseudo-second-order kinetic models. The thermodynamic values, including the enthalpy change (ΔH°), the Gibbs free energy change (ΔG°), and entropy change (ΔS°), showed that the adsorption processes were spontaneous and exothermic entropy-reduction process for BPA, but spontaneous and endothermic entropy-increasing processes for the others. The Fe3O4@MIL-53(Al) was also found to be easily separated after external magnetic field, can be a potential candidate for future water treatment.

Tuning the Topology of Two‐Dimensional Covalent Organic Frameworks through Site‐Selective Synthetic Strategy

“…[31,32] To underline the outstanding performance of NH 2 À AhÀ Tz COF, we compared the maximum adsorption capacities with those of reported adsorbents for CV and CR in Tables S9 and S10. The maximum adsorption capacity of NH 2 À AhÀ Tz COF for CR surpassed that of many reported metal-organic frameworks (MOFs) and COFs, such as Mn-UiO-66@GO-NH 2 (1265.82 mg/g), [57] MIL-88 A(Fe) (PMFe-x) (1141.4 mg/g), [58] COF-COONi/Ca (781.25/704.23 mg/ g), [59] Fe 3 O 4 @MIL-53(Al) (234.4 mg/g), [60] Fe 3 O 4 @TpPDA (179.4 mg/g), [61] and so on. Similarly, the saturated adsorption capacity of NH 2 À AhÀ Tz COF for CV was superior to many reported materials, such as SCNUÀ Z2 (847.4 mg/g), [62] TpPa-SO 3 Na COF (728.4 mg/g), [63] COFÀ H2 (151.8 mg/g), [64] COF-TPDD-COOH (88.02 mg/g), [65] LYU-2 (44.8 mg/g) [66] and Zn-MOF (7.355 mg/g) [67] etc.…”

Evaluation of the Effect of Bimetallic Organic Framework M/Fe-MOF (M=Ni, Co) on the Removal of Congo Red Dye

“…At 0-180 min, the adsorption capacity of CR increased rapidly. From 180 to 300 min, the adsorption capacity of CR did not increase significantly with increasing time, so 180 min is the adsorption equilibrium time of CR [18]. Therefore, we choose a time of 60 minutes for the next adsorption experiments for Ni/Fe-MOFs, Co/Fe-MOF, Fe-MOF materials.…”

Tetracycline degradation in the Fe3O4@HKUST-1/persulfate system: properties, activation mechanism, and degradation pathways

“…13 Further, they show great potential in wastewater remediation. 14 For example, Zhang et al 15 prepared a MOF-based magnetic adsorbent material (Fe 3 O 4 @MIL-53(Al)) for the removal of TC, bisphenol A (BPA), methylene blue (MB), and Congo red (CR) from contaminated water and achieved maximum adsorbent capacities of 47.8, 160.9, 70.8, and 234.4 mg g −1 , respectively. Zong et al 16 used PCN-224 to remove TC from water and achieved an adsorption capacity of up to 354.8 mg g −1 , which is relatively higher than those of other reported MOF-based adsorbent materials.…”