**3.5 Dendrimers**

The word "*dendrimers*" is a Greek word, where "*dendri*" means like a branch of tree and "*meros*" means part of tree. These are highly branched and

#### **Figure 7.** *Iron-oxide Nano-materials (NMs) for removal of heavy metals [43].*

mono-disperse macromolecule of polymers [46–48]. These show a great potential in environmental applications. The composite, Dendrimers-NPs can be used to enhance catalytic activity due to less toxicity and more reactivity and more surface areas [49, 50].
