Ismail,M. U.De Silva,H. I. C2026-09-202026-09-202026-05-021012-8999https://dr.ichemc.ac.lk/handle/123456789/494Abstract No: 2025_437 Page No 95Metal oxide nanoparticles (NPs) have attracted significant attention in organic catalysis for the development of recoverable heterogeneous systems.enatom-economical34-dihydropyrimidinonesheterogeneousmulticomponentSustainable synthesis of zinc oxide nanoparticles from spent coffee grounds as a reusable catalyst for Biginelli reactionArticle