Improved Catalytic Activity of Composite Beads Calcium Alginate@MIL-101@Fe3O4 Towards Reduction Toxic Organic Dyes

The defiance of this study was to explore the potential of alginate/MIL-101 beads containing Fe3O4 nanoparticles as a catalyst for the reduction of dyes. The Fe3O4@MIL-101 magnetic composite was obtained by the mechanical method and then encapsulated using calcium alginate (CA) as a crosslinked matrix. The Fe3O4(X)@MIL-101/CA composites beads at different content (X) of Fe3O4 nanoparticles were evaluated for the catalytic reduction of methylene blue (MB) and orange G (OG). The aerogel beads have completed the MB dye reduction after 7 min with a rate constant of 0.962 min(-1). This strong activity is assigned to the synergistic effect between Cr containing MIL-101 the Fe3O4 particles and the hydrides formed on the catalyst surface. The obtained optimal conditions of MB dye reduction were used for the reduction of OG dye in simple and binary system.The best catalyst M(1)@MIL-101/CA showed a high affinity via MB dye in a binary system. Then was easily recovered by an external magnetic field and reused for 4 cycles. On the other hand, the time of the catalytic activity clearly increased in its 4th reuse in the reduction of MB dye but did not affect the efficiency of catalytic reduction.

Automated summary

The study explored the potential of alginate/MIL-101 beads containing Fe3O4 nanoparticles as a catalyst for the reduction of dyes, obtaining a Fe3O4@MIL-101 magnetic composite and evaluating its catalytic reduction of dyes. The optimal catalyst showed high affinity for dyes in a binary system and could be easily recovered and reused with consistent efficiency after multiple cycles.