Integration of MIL-101-NH₂ into Cellulosic Foams for Efficient Cr(VI) Reduction under Visible Light

Abstract

In this Article, a hybrid foam was fabricated through the integration of amine-functionalized Fe-MOF (MIL-101-NH2) into cellulosic matrix. The existence of enormous group linkages and ionic bonding interactions among the composite foam network leads to a uniform dispersion of MIL-101-NH2 and high affinity between the MOF and cellulose skeleton. As-prepared hybrid foams were utilized as photocatalysts to reduce toxic hexavalent chromium ions (Cr­(VI)) under visible light. Optimal performance was observed over CM-1 (with a MIL-101-NH2 and nanocellulose mass ratio of 1:1). When compared to pure MOF nanoparticle counterparts, the CM-1 foam presented preferable and more efficient Cr­(VI) removal performance. The reasons could be attributed to the hierarchal pore structure and uniform MOF loading. Moreover, the flexible foams could be easily separated from the solution and preserved more than 80% removal efficiency of Cr­(VI) after 10 runs. This work would shed light on how to construct high-efficiency photocatalysts for environmental governance from sustainable materials.

Construction of MIL-125-NH2@BiVO4 Composites for Efficient Photocatalytic Dye Degradation

“…The concentrations of Cr(VI) were tested according to the 1,5-diphenylcarbazide (DPC) colorimetric method. 35 Triple testing was performed for each sample for averaging the results to ensure the reproducibility of the results. To determine the stability of the prepared composite, the used material was collected and the same degradation experiment was performed for five cycles.…”

“…At given intervals of time, 3 mL of the reaction suspension was filtered with a 0.22 μm syringe filter to eliminate the residue particles, and the concentrations of filtrate were collected at the maximum absorption wavelength of the specific position (MG: 617 nm, CV: 590 nm, MB: 664 nm, CR: 496 nm, Cr­(VI): 540 nm) by a UV–vis spectrophotometer. The concentrations of Cr­(VI) were tested according to the 1,5-diphenylcarbazide (DPC) colorimetric method . Triple testing was performed for each sample for averaging the results to ensure the reproducibility of the results.…”

Cellulose-Based Materials for Water Remediation: Adsorption, Catalysis, and Antifouling

“…Cellulose offers also a MOF-based material with a lightweight and porous structure (Bo et al, 2018;Ma S. et al, 2019;Bahmani et al, 2020). Cellulose-MOFs materials can be prepared as aerogels (Zhu et al, 2016;Lei et al, 2019;Li J. et al, 2020), filter paper (Hashem et al, 2019), substrate (Gu et al, 2020), membrane (Yang et al, 2018), and foams (Liu et al, 2021). Further information for CelloMOF for water treatment can be found in the Review (Abdelhamid and Mathew, 2022).…”

Visible-Light-Driven Zr-MOF/BiOBr Heterojunction for the Efficient Synchronous Removal of Hexavalent Chromium and Rhodamine B from Wastewater

“…With the merits of these outstanding properties, MOFs play significant roles in separation, adsorption, catalysis, sensing, etc. Specifically, photoresponsive MOFs have attracted more attention due to the abundant adsorption channels and carrier charge transfer pathways. − Moreover, owing to the organic ligands and metal clusters, MOFs act as reception aerials to capture light to generate the excited hole–electron pairs, which can effectively promote light utilization. , In particular, Zr-based MOFs have unique aqueous stability, and UiO-66-NH 2 possesses high visible-light photocatalytic ability due to the introduction of amino groups. , …”