Abstract

• In recent years, scientists have recently turned to the green synthesis of nanoparticles from solid wastes and used these in many applications. The calcium aluminate phase has been made by fusing or sintering together an appropriate mixture of CaO and Al2O3. These two metal oxides were investigated by using waste powder as raw materials. The key distinction in this research lies in the synthesis of calcium aluminate nanoparticles from waste quail eggshells and discarded aluminum cans (specifically, Coca-Cola cans) using the sonochemical method. The synthesis of calcium aluminate with two different weight ratios of CaO: Al2O3 (1:1 and 1:2), as well as different calcination periods and temperatures. The calcium aluminate (Ca12Al14O33) was synthesized at a calcination temperature of 1200°C, a calcination period of 1 h, and a 1:2 weight ratio of CaO to Al2O3. The average crystallized size of synthesized calcium aluminate nanoparticles was 43.82 nm. The antimicrobial investigation of synthesized calcium aluminate nanoparticles revealed significant antimicrobial activity against eight tested microorganisms. The inhibition zone diameters ranged from 20 to 29 mm. These results demonstrated that synthesized calcium aluminate nanoparticles hold potential as antimicrobial substances for other application fields.