Functionalization of ZnO Particles with Tetraethyl Orthosilicate (TEOS) and Application as Heavy Metal Adsorbent Cu2+Istifhamy Irnanda, Nazriati Nazriati, Nani Farida and Adilah AliyatulmunaE3S Web Conf., 481 (2024) 03005DOI: https://doi.org/10.1051/e3sconf/202448103005