Temperature-regulated formation of hierarchical pores and defective sites in MIL-121 for enhanced adsorption of cationic and anionic dyes

Hu, Na; Hang, Fangxue; Li, Kai; Liao, Ting; Rackemann, Darryn W.; Zhang, Zhanying; Shi, Changrong; Xie, Caifeng

doi:10.1016/j.seppur.2023.123650

Cited by 15 publications

(2 citation statements)

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“…The pseudo-first-order kinetic coefficients for RhB, MB, and CV are 0.96554, 0.95013, and 0.97826, respectively, and the second-order R 2 values are 0.99167, 0.99982, and 0.99971. The results demonstrated a better fit relative to the pseudo-second-order kinetic model, with correlation coefficients (R 2 ) exceeding 0.99, surpassing those obtained from the pseudo-first-order model [45]. This confirmed that the interactions between POMOF1/PAN NFM and RhB, MB, and CV were predominantly governed by chemical processes.…”

Section: Adsorption Kinetics and Isothermsmentioning

confidence: 53%

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Rapid, Massive, and Green Synthesis of Polyoxometalate-Based Metal–Organic Frameworks to Fabricate POMOF/PAN Nanofiber Membranes for Selective Filtration of Cationic Dyes

Li,

Yu,

Zhang

et al. 2024

Molecules

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Developing high−efficiency membrane materials for the rapid removal of organic dyes is crucial but remains a challenge. Polyoxometalates (POMs) clusters with anionic structures are promising candidates for the removal of cationic dyes via electrostatic interactions. However, their shortcomings, such as their solubility and inability to be mass−produced, hinder their application in water pollution treatment. Here, we propose a simple and green strategy utilizing the room temperature stirring method to mass produce nanoscale polyoxometalate−based metal−organic frameworks (POMOFs) with porous rhomboid−shaped dodecahedral and hexagonal prism structures. The products were labeled as POMOF1 (POMOF-PW12) and POMOF2 (POMOF-PMo12). Subsequently, a series of x wt% POMOF1/PAN (x = 0, 3, 5, and 10) nanofiber membranes (NFMs) were prepared using electrospinning technology, where polyacrylonitrile (PAN) acts as a “glue” molecule facilitating the bonding of POMOF1 nanoparticles. The as−prepared samples were comprehensively characterized and exhibited obvious water stability, as well as rapid selective adsorption filtration performance towards cationic dyes. The 5 wt% POMOF1/PAN NFM possessed the highest removal efficiency of 96.7% for RhB, 95.8% for MB, and 86.4% for CV dyes, which realized the selective separation over 95% of positively charged dyes from the mixed solution. The adsorption mechanism was explained using FT−IR, SEM, Zeta potential, and adsorption kinetics model, which proved that separation was determined via electrostatic interaction, hydrogen bonding, and π–π interactions. Moreover, the POMOF1/PAN membrane presented an outstanding recoverable and stable removal rate after four cycles. This study provides a new direction for the systematic design and manufacture of membrane separation materials with outstanding properties for contaminant removal.

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Section: Adsorption Kinetics and Isothermsmentioning

confidence: 53%

“…Subsequently, 5 mL of the suspension was periodically taken and the UV-vis absorption spectrum of the supernatant was tested after centrifugation. Its dynamic model formula is as follows [45]:…”

Section: Adsorption Kineticsmentioning

confidence: 99%