Sulfuric acid doped poly diaminopyridine/graphene composite to remove high concentration of toxic Cr(VI)

Recent Advances in Applications of Hybrid Graphene Materials for Metals Removal from Wastewater

“…Tadjarodi et al added 2-pyridinecarboxaldehyde thiosemicarbazone to GO to create (GO/2-PTSC) assisted with ultrasonic waves [36]. Sulfuric acid doped poly-diaminopyridine/graphene (G-PDAP) was synthesized by Dinda and Saha via the mutual oxidation-reduction technique by adding 2,6-Diamino pyridine to a GO suspension [37]. Najafabadi et al used glyoxal as a crosslinking agent to develop chitosan/graphene oxide using electrospinning [38].…”

“…G-PDAP is a sulfuric acid doped diaminopyridine polymer prepared in-situ on the surface of GO through mutual oxidation-reduction process as detailed in Figure 13. At the first step, graphene oxide is prepared from graphite through modified Hummer's method like in most cases and diaminopyridine is then added in the presence of H2SO4 which introduces more active sites on the surface of the adsorbents [37]. Ultrasonication was a popular synthesis route with organic graphene composites with competitive results [38,80,141].…”

“…The regeneration studies for PG-C and CNF-C revealed that the adsorbents had the potential to be reused for multiple cycles in the adsorption of Cr (VI) [85]. Upon analysis of regeneration studies and maximum capacities achieved, G-PDAP is recommended as a cost-effective adsorbent for the removal of chromium from aqueous solutions [37].…”

Carbon nanotubes, graphene, and their derivatives for heavy metal removal

“…Moreover, the peaks of C-O groups at 1071 and 1191 cm −1 shifted to 1043 and 1079 cm −1 , respectively, and it was thought to be caused by the chelating and ion exchange between Pb(II) and O-H groups. Dinda et al [99] polymerized 2,6-diamino pyridine on GO surfaces via mutual oxidation-reduction techniques to prepare sulfuric acid-doped poly diaminopyridine/graphene (G-PDAP) composite. The as-prepared P-DAP was investigated as an adsorbent to remove high concentration of toxic Cr(VI) from water.…”

Ready-to-use strip for l-ascorbic acid visual detection based on polyaniline/polyamide 66 nano-fibers/nets membranes

“…Moreover, EB can be in its saltemeraldine salt (ES) form [18]. Notably, the transformations between the forms are usually accompanied by considerable changes in electrical and optical properties, which makes PANI a promising material for sensing applications [19][20][21]. However, poor solubility of PANI in water or organic solvents is always an inherent major obstacle in making the assays.…”