Biography
Abstract
An enantiomeric pair imprinted polymeric film, with embedded functionalized multiwalled carbon nanotubes, was developed following the ‘surface grafting from’ approach onto a gold nanoparticles decorated pencil graphite electrode. Double imprinting of chiral molecules in a single polymer motif, as a sensory platform, for the one-by-one evaluation of individual components of a racemic mixture, is a challenging task. The underlying state-of-art proposed for this purpose is novel and if this works well, any two simple molecules could be used as templates. In this work, a pencil graphite electrode was first dipped for the overnight in the aqueous suspension of gold nanoparticles. The electrode was then subjected to spin coating with a pre-polymerization mixture consisting a monomer (N-acryloyl-pyrrolidine-2,5-dione) , templates (D- and L-Aspartic acid) , a cross-linker (ethylene glycol dimethacrylate) in the presence of an initiator (α,α’-azoisobutyronitrile). As aspartic acid isomers have been found to be electro-inactive, their evaluation was feasible indirectly with the help of a potassium ferricyanide probe. The quantitation ability of the proposed sensor, with differential pulse anodic stripping voltammetric transduction, was found to be in the tune of 4.08 ng mL−1 (S/N=3) for both the enantiomers in the real samples, which reportedly manifest several chronic diseases at their stringent limits.
Biography
Abstract
Present study was consisted in the chemical treatment of raw timber sawdust (TS-OH)r by chemical agents (acid and base) for the comparative removal of two anionic dyes, namely, Thiazole Yellow (TY) and Bright Yellow (BY), from aqueous solutions. Batch experiments were performed to evaluate the influence of various operating conditions viz., pH, contact time, temperature, etc. on dyes removal efficiency. This results obtained from the Adsorption of the two dyes, was found to be endothermic with second-order rate kinetics, who followed the Langmuir isotherm. The monolayer saturation capacities are 1408.4507 and 140.845 mg g-1 for Thiazole Yellow and Bright Yellow respectively. Adsorption was favorably influenced by an increase in the temperature of the operation. The positive values of the change in entropy (DS0) and heat of adsorption (DH0); and the negative value of change in Gibbs free energy (DG0) indicate feasible and spontaneous adsorption of (TY and BY) on adsorbent. Desorption experiments with 1 M aqueous NaCl put into evidence that anionic dyes were completely desorbed from the matrices and the reusability of the (TS-OH)r chemically modify after three repeated cycles led to just a slight attenuation in its performance. These results show that chemical treatment of a low value by-product of the timber industry leads to an effective adsorbent