Metal complexation studies of amylopectin‐graft‐poly[(N,N‐dimethylacrylamide)‐co‐(acrylic acid)]: a biodegradable synthetic graft copolymer

Abstract

Synthesis of amylopectin‐graft‐poly[(N,N‐dimethylacrylamide)‐co‐(acrylic acid)] was carried out using solution polymerization technique with potassium persulfate as the initiator. The graft copolymer was characterized by measuring molecular weight using size exclusion chromatography, thermal analysis and Fourier transform infrared (FTIR) spectroscopy. The synthetic graft copolymer was used for the removal of some potentially toxic metal ions, Cu(II), Zn(II) and Ni(II), from their aqueous solutions. Various operating parameters like the amount of adsorbent, solution pH, contact time and temperature were studied. The adsorption data were well described by the pseudo‐second‐order and Langmuir isotherm models. Metal complexation studies were carried out experimentally using cyclic voltammetry and UV‐visible and FTIR spectroscopies. The metal complex structure was also studied theoretically using density functional theory with the Gaussian 09 program and the geometry of the complex structure was optimized. The metal complexation ability of the graft polymer was in the order Cu(II) > Ni(II) > Zn(II). Calculation of the various thermodynamic parameters was also done. The negative value of free energy change indicates the spontaneous nature of the adsorption. © 2015 Society of Chemical Industry

Interfacial Electrochemical Polymerization for Spinning Liquid Metals into Core–Shell Wires

“…And the complexation was substantiated by the position reduction of −COO – peaks from ∼1718 to ∼1667.2 cm –1 (Figure S3B). Thus, Ga 3+ ions would serve as cross-linkers to reinforce the organic shells, in analogy to our previous report . And the surface oxidation should benefit the coating of the polymeric shells …”

Sulfated katira gum‐graft‐poly(N‐vinyl imidazole): A useful scavenger of mercury(II) ions

“…The UV–vis spectra of the Hg(II)‐loaded SKG‐ g ‐PNVI and Hg(NO 3 ) 2 salt solution in water (SKG‐ g ‐PNVI) showed that it was sparingly soluble in hot water. We obtained the medium for the UV–vis spectral analysis by heating a very small amount of sulfated polymer in an excess amount of water at 80 °C for 4 days and then filtering it, as shown in Figure (c). We observed from the figure that Hg(II) absorbed at 298 nm, but when Hg(II) was complexed with O , a redshift occurred [maximum wavelength (λ max ) = 368.5 nm, as shown in the inset in Figure (c)].…”

Bio-Based Polymeric Flocculants and Adsorbents for Wastewater Treatment

“…Adsorption is a widely used process worldwide for the removal of chemical contaminants from water. It is favored among various water treatment methods due to its simplicity and excellent ability to remove metal ions [138,139] and dye molecules in water [140,141]. Unlike other processes, adsorption is sludge-less and can be effective for both high and low concentrations of pollutants.…”

“…The concentration of glucose can be determined by measuring the optical density (OD) using a photoelectric colorimeter after adding DNS (2,4-dinitrosalicylic acid) at pH 6.7 in a phosphate-buffered solution (PBS) [216]. The results of the study are summarized in Figure 10a [120,139,181,216]. The polysaccharides exhibited a more rapid degradation compared to the graft copolymers.…”

“…Overall, polysaccharide-based graft copolymers demonstrate biodegradability. In a study by Kolya et al, the enzymatic hydrolysis of polysaccharide-based graft copolymers and virgin polysaccharides using α-amylase was observed [120,139,181,182,216]. α-amylase is an enzyme capable of cleaving the glycosidic linkage (1,4-α-D-glycosidic) in starch chains, releasing glucose residues.…”