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Poly(amido-amine) (PAMAM) was first reported in the 1980s and became the first dendrimer family to be produced and marketed [61]. It is a class of monodisperse, hyperbranched polymer with rich terminal amino functional groups that can be precisely controlled and functionalized with hydroxyl (OH), the carboxylic acid (COOH) or conjugated to hydrocarbon chains [62]. Full generational growth of PAMAM dendrimer can be synthesized with the aid of a microwave by first separately dissolving EDA and multi-ester in methanol, then allowing both solutions to cool down before gradually adding the multi-ester to EDA solution warmed at ambient temperature for several days [63]. PAMAM has gained a lot of research interest as the most widely studied dendrimer due to its unique characteristics such as good biocompatibilities, a high specific surface area, good chemical stabilities, high-capacity chelating agents for metal ions, and many tertiary and primary amine groups in its inner and surface structure [64, 65]. As such, research interest has increased over the years for using PAMAM dendrimers for the adsorptive removal of heavy metals from soil and aqueous solution [66] (Table 1.5). Adsorption is commonly employed due to its simplicity, low cost, and high efficiency.