Mahmuda D. Magnetite Surface Modification with Silica and Its Application as Adsorbent of Heavy Metal Ion Nickel and Manganese. Eksergi [Internet]. 2022 Apr. 5 [cited 2025 Jul. 18];19(1):6-9. Available from: https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/5304