▎ 摘　　要

New Schiff base (SB) functionalized graphene oxide (GO) nanosheets containing phosphomolybdic counter-anion H2PMo12O40 (over bar) (H2PMo) were successfully prepared by grafting of 3-aminopropyltriethoxysilane (APTS) on GO nanosheets followed by condensation with benzil and finally reaction with phosphomolybdic acid (H3PMo12O40, denoted as H3PMo) and characterized using Fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), particle size distribution, energy-dispersive X-ray (EDX) analysis, EDX elemental mapping, and inductively coupled plasma optical emission spectrometry (ICP-OES). The prepared new nanomaterial, denoted as GO-SB-H2PMo, was shown to be an efficient heterogeneous catalyst in one-pot, three-component reaction of beta-naphthol, aldehydes, and dimedone, giving high yields of tetrahydrobenzo[a]xanthene-11-ones within short reaction times. The catalyst is readily recovered by simple filtration and can be recycled and reused several times with no significant loss of catalytic activity.