As the latest member in nano carbon family, carbon dots (Cdots) have attracted much attention due to their unique photoluminescence properties23,24], but the adsorption potentialhas not been much exploited yet. In fact, carbon dots possess more oxygen-containing groups in comparison with its siblings,thus could potentially have higher metal adsorption capacity.Besides, unlike CNTs and graphene, the simple and economic
preparation steps make the large scale production and commercialization of C-dots possible. By thermal oxidation of proper precursors on solid supports such as zeolite the preparation and immobilization of C-dots could be facilitated in one step,resulting in an ideal sorbent with suitable mechanic strength and versatile binding surface for various targets.