Metal recovery using nanobiotechnology

Microalgae as a potential natural source for the green synthesis of nanoparticles

“…Thus, -NH 2 groups play a protective role by coating the NPs, providing stabilization, and preventing agglomeration in intracellular and extracellular processes. 33,48,49 Using Fourier transform infrared spectroscopy (FTIR), Arya A. et al (2020) 50 compared and identified the main functional groups present in an algal extract from B. braunii that could reduce and stabilize palladium and platinum NPs, and revealed the role of protein amides as a capping agent. As another example, Mahajan A. et al (2019) 51 demonstrated the ability of the aqueous extract of C. vulgaris to reduce silver ions in AgNPs, which was also accompanied by its subsequent stabilization.…”

“…35 The reducing power of proteins could be observed in the oxidation of the aldehyde (–CHO) groups, while carbohydrates possess reducing hydroxyl (–OH) groups that could bind and reduce metal ions. 7,33,48 In addition, polysaccharides and proteins, together with a basic pH, can act as stabilizing agents for NPs, due to their adsorption onto the surface of the NPs, and hence can prevent their agglomeration to ensure their colloidal stability.…”