Facile Synthesis of MOFs-Templated Carbon Aerogels with Enhanced Tetracycline Adsorption Performance

Abstract

Three-dimensional aerogels have great potential for antibiotic removal from aqueous solution due to their excellent solution mass transfer channels and special morphology. Herein, the metal ions were bound with alginate to form alginate-Fe, alginate-Cu, and alginate-Fe-Cu hydrogels, then they were used as nucleation sites for metal organic framework (MOF) growth to obtain MAlgs gels, respectively. Considering the aqueous environmental stability of MOFs particles, the alginate and MOF particles in MAlgs aerogels were pyrolyzed as templates to obtain the derived carbon aerogel CMAlgs. The results showed that the adsorption capacity of MAlgs-Fe-Cu aerogel was higher than that of MAlg-Cu and MAlg-Fe aerogels, up to ~130 mg·g−1. The adsorption performance of carbon aerogel CMAlg-Cu decreased obviously because of the decrease of pore size and oxygen-containing functional groups. The adsorption process is a combination of physical adsorption and chemical adsorption. In addition, CMAlgs aerogels exhibit better recyclability than MAlgs aerogels. This work provides a new strategy for fabricating MOFs-templated in-situ grown carbon aerogels for water purification.

In‐situ Synthesis of Highly Potent Antibacterial Copper‐Based MOFs/Sodium Alginate Composite Beads

“…[35,37] Similarly, CuMOF-Oxa/Alg beads display a set of diffraction peaks at 10.5°, 20.5°, 33.4°, 36.1°, and 48.3°, proving their crystalline structure arising from the coordination of carboxylate groups-COOH of the oxalic acid with copper within copper-ion crosslinked alginate beads, leading to the formation of CuMOF-Oxa/Alg composites with a three-dimensional arrangement. [34,38] These results demonstrate the successful in situ synthesis of CuMOF-Tart/Alg and CuMOF-Oxa/Alg within a sodium alginate matrix.…”

“…CuMOF‐Tart/Alg beads display intense diffraction peaks at 2θ= 10.3 °, 12.9 °, 18.1 °, and 22.6 °, which are mainly associated with the three‐dimensional pores within the CuMOF‐Tart/Alg composite bead network formed through the coordination of ‐COOH and ‐OH groups in tartaric acid with copper ions present in the copper‐ion‐crosslinked alginate beads [35,37] . Similarly, CuMOF‐Oxa/Alg beads display a set of diffraction peaks at 10.5°, 20.5°, 33.4°, 36.1°, and 48.3°, proving their crystalline structure arising from the coordination of carboxylate groups–COOH of the oxalic acid with copper within copper‐ion crosslinked alginate beads, leading to the formation of CuMOF‐Oxa/Alg composites with a three‐dimensional arrangement [34,38] . These results demonstrate the successful in situ synthesis of CuMOF‐Tart/Alg and CuMOF‐Oxa/Alg within a sodium alginate matrix.…”

Preparation of Chitosan-Modified Bentonite and Its Adsorption Performance on Tetracycline

“…At the same time, the adsorbent can be recycled and regenerated, which reduces the cost of wastewater treatment. 7 The commonly used adsorbents for treating TC wastewater are activated carbon, 8 MOFs, 9 bentonite, 10 biochar, 11 nanotubes, 12 metal oxides, 13 etc. Activated carbon has good adsorption effect and is widely used, but its cost is high and it is easy to lose.…”