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    Tb-2(WO4)(3)@N-GQDs-FA as an efficient nanocatalyst for the efficient synthesis of beta-aminoalcohols in aqueous solution
    (Elsevier, 2021) Azizi, Sajjad; Darroudi, Mahdieh; Soleymani, Jafar; Shadjou, Nasrin
    In the current study, Tb-2(WO4)(3)@N-(GQDs) modified with folic acid (FA) was synthesized during the chemical reaction of terbium(III) tungstate nanoparticles with nitrogen doped graphene quantum dots (N-GQDs) and introduced as a heterogeneous catalyst for the synthesis of beta-aminoalcohols derivatives. The as-prepared Tb-2 (WO4)(3)@N-GQDs-FA is stable at -4 degrees C for at least two month. Herein, the reaction time, solvent, and catalyst amount were optimized. The Tb nanostructure exhibited a high efficiency, less reaction time, excellent selectivity, and simple procedure for these transformations. The performance Tb-2(WO4)(3)@N-GQDs-FA nanocatalyst catalyst is thoroughly investigated which shows several advantageous including to facile preparation from readily available materials. Shorter reaction times, easy work-up, green reaction media, higher yields (near 97%), and no need to use the chromatographic column are the advantages of the reported synthetic method. The Tb-2(WO4)(3)@N-GQDs-FA heterogeneous catalyst has been recovered through filtration and also reused for multiple cycles. The recovered catalyst can be used for another nine successive reaction without noticeable loss in activity. The reaction time is also reduced and products can be obtained by convenient workup, and environmental-friendly procedure.