“…Bentonite pillarization using Ti cations is expected to increase the basal distance and specific surface area (Basuki et al, 2019; Zuo et al, 2015). The adsorbent composite materials that have been studied include bentonite-TiO 2 , bentonite-iron oxide, OPBA-zeolite/chitosan, TiO 2 -natural zeolite, biosilica/chitosan (Fatimah, 2012;Khanday et al, 2017;Liu et al, 2015;Sutrisno et al, 2016). In this study, the preparation of environmentally friendly adsorbents made from nanocomposite OPBA, Bentonite, and TiO 2 was carried out to adsorb heavy metals.…”