Application of Silica from Beach Sand in the Synthesis of Calcium-Alginate-Silica as Adsorbent of Na+ and Cl- IonsNisrina Safa Kamila, Alif Alfarisyi Syah and Anugrah Ricky WijayaE3S Web Conf., 481 (2024) 03011DOI: https://doi.org/10.1051/e3sconf/202448103011