GREEN SYNTHESIS OF COPPER OXIDE NANOPARTICLES USING CARICA PAPAYA LEAF EXTRACT FOR ADSORPTIVE REMOVAL OF WATER HARDNESS. iijp [Internet]. 2026 Feb. 28 [cited 2026 May 1];2(issue 1):854-66. Available from: https://impactinternationaljournals.com/publications/index.php/ojs/article/view/278