The development of effective and practical adsorbents for eliminating pollutants still remains a significant challenge. Herein, we synthesized a novel magnetically separable composite, Co 0.6 Fe 2.4 O 4 /MIL-101-NH 2 , through the in-situ growth of MIL-101-NH 2 on magnetic nanoparticles, designed specifically for the removal of Congo red (CR) from aqueous solutions. MIL-101-NH 2 possessed high BET surface area (240.485 m 2 •g −1 ) and facile magnetic separation function and can be swiftly separated (within 30 s) through an external magnetic field post-adsorption. The investigation systematically explored the influence of crucial parameters, including adsorbent dosage, pH, adsorption duration, temperature, and the presence of interfering ions, on CR adsorption performance. Findings indicate that CR adsorption adheres to the pseudo-second-order (PSO) kinetic model and the Langmuir isotherm model. Thermodynamic analysis reveals the spontaneity, endothermic nature, and orderly progression of the adsorption process. Remarkably, the adsorbent with 0.1 g•L −1 boasts an impressive maximum adsorption capacity of 1756.19 mg•g −1 for CR at 298.15 K, establishing its competitive advantage. The reuse of the adsorbent over 5 cycles remains 78% of the initial adsorption. The CR adsorption mechanisms were elucidated, emphasizing the roles of π-π interactions, electrostatic forces, hydrogen bonding, and metal coordination. Comparison with other dyes, such as methylene blue (MB) and methyl orange (MO), and exploration of adsorption performance in binary dye systems, demonstrates the superior capacity and selectivity of this adsorbent for CR. In conclusion, our magnetically separable metal–organic framework (MOF)based composite presents a versatile and effective solution for CR removal, with promising applications in water treatment and environmental remediation. Graphical
Lin Long,Erqi Yang,Xiaosi Qi,Ren Xie,Zhongchen Bai,Shuijie Qin,Wei Zhong
In order to obtain the excellent comprehensive properties of microwave absorbers (MAs), core@shell structured Co0.6Fe2.4O4@MoS2 nanocomposites were elaborately constructed and synthesized by a facile two-step hydrothermal method. Due to the independence of the two-step processes, the method could be applied to produce different categories of MoS2 based nanocomposites. The obtained results demonstrated that the as-prepared Co0.6Fe2.4O4@MoS2 nanocomposites exhibited superior electromagnetic wave absorption performances with very low minimum reflection loss (RLmin) value and broad absorption bandwidth at thin matching thicknesses. Impressively, the optimal RLmin value reached −79.9 dB at 11.2 GHz with a thickness of 2.73 mm, and an effective bandwidth of 5.96 GHz was observed with thicknesses of 2.34 and 2.98 mm. Taking into account their the low cost of production, high stability and controllability, the obtained results demonstrated that the Co0.6Fe2.4O4@MoS2 nanocomposites achieved in this study are very attractive candidates for new types of high performance MAs. Moreover, we believe that constructing core@shell structured MoS2-based nanocomposites is a reliable strategy to accelerate advancements of MAs.
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