Hayat Zerrouki, et al. “Green Synthesis of Nickel Oxide Nanoparticles Using Helianthus Annuus Seed Husks Extract and Their Application for Removal of Pb (II), Cd (II), and Cu (II) Ions from Contaminated Water”. International Journal of Computational and Experimental Science and Engineering, vol. 12, no. 2, May 2026, doi:10.22399/ijcesen.5304.