Facile fabrication of composition-tunable Fe/Mg bimetal-organic frameworks for exceptional arsenate removal

Abstract

The rational design of metal-organic frameworks with tailored components and structural features is crucial for achieving the desired functions and expanding the emerging applications. Herein, water-stable bimetallic Fe/Mg metal−organic frameworks (Fe/Mg-MIL-88B) have been successfully fabricated through a facile and effective one-step strategy to access the exceptional arsenic decontamination. Notably, the obtained bimetallic Fe/Mg-MIL-88B architectures are demonstrated to possess a well-defined spindle-like morphology. Interestingly, the Fe/Mg molar ratios within the resultant Fe/Mg-MIL-88B frameworks can be flexibly modulated on demand, leading to the variation of the structural features associated with length/diameter ratio and unit cell parameters along with surface areas. Thanks to the unique structural and compositional merits as well as the synergetic contribution from two active metal centres, the fabricated Fe/Mg-MIL-88B nanospindles exhibit enhanced decontaminant performance toward arsenate in terms of ultrafast sorption kinetics and high sorption capacities, compared to the monometallic Fe-MIL-88B.

Cu@Co-MOFs as a novel catalyst of peroxymonosulfate for the efficient removal of methylene blue

“…The lower binding energy peak at 531.3 eV was ascribed to the Co-O bands. 37 The other peak located at 532.2 eV was attributed to the carboxylate groups of the BDC linkers (O-C]O). These results together with XRD and FT-IR analyses indicate the Cu@Co-MOFs-3 was synthesized successfully with a one-step hydrothermal method.…”

Facile fabrication of bimetallic Fe–Mg MOF for the synthesis of xanthenes and removal of heavy metal ions

“…Fe-Mg bimetallic organic frameworks with different molar ratios of Fe 3+ : Mg 2+ , (0.6 : 1 and 1 : 1), were synthesized as reported previously. 27 1 mmol of Mg(NO 3 ) 2 $6H 2 O, Fe(NO 3 ) 3 $9H 2 O (0.6 mmol or 1 mmol) and 1 mmol of terephthalic acid (H 2 BDC) were dissolved in 10 mL of DMF under constant stirring. The mixture was blended completely and heated at 120 C in a Teon-lined autoclave for 8 h. Then, the suspension was cooled gradually to room temperature, collected by centrifugation, washed with DMF several times and dried at 120 C under vacuum.…”

Superior arsenate adsorption and comprehensive investigation of adsorption mechanism on novel Mn-doped La2O2CO3 composites

“…Among the current arsenate removal technologies, adsorption is regarded as a promising technology with the advantages of simplicity in operation, low cost and without yielding harmful by-products [8]. Numerous adsorbents, such as metal oxides/bimetallic oxides [1,9], porous MOFs [10,11] and modified activated carbon [3], have been synthesized for the purpose of arsenate removal. However, most of them still suffered from the limited adsorption capacity.…”