Solvent design for trace removal of pyridines from aqueous streams using solvent impregnated resins

Enhanced pyridine biodegradation under anoxic condition: The key role of nitrate as the electron acceptor

“…Therefore, researchers have devoted themselves to develop effective and economically feasible methods for the remediation of the sites contaminated by pyridine. Various physico-chemical methods have been investigated for the treatment of pyridine-containing wastewater, such as adsorption [5], oxidation [6], microwave radiation [7], liquid-liquid extraction [8], and so on. However, because of their huge economic and energy consumption, the application of these physico-chemical methods is limited.…”

Selective recovery of a pyridine derivative from an aqueous waste stream containing acetic acid and succinonitrile with solvent impregnated resins

“…Here, both nitrogen atoms of CP act as Lewis base and the hydroxyl functional group of DBP acts as Lewis acid [22]. In a previous study [23], we established a model describing interactions of the phenol based solvents with CP through both the cyanide group and the pyridine nitrogen in the aromatic ring. Additionally, phenols can form self-associates, and also the oligomers of phenols can complex with CP as depicted in Fig.…”

“…3. The model [23] could describe the experimental data with high accuracy, but needed a large amount of data to regress the parameters. To simplify the system in order to minimize computational efforts and the required data-points, a simplified model was developed.…”

“…In our previous study a solvent selection procedure was presented for the selective removal of CP from an aqueous phase [19]. In that study, it was found that with phenol based solvents the highest capacities were obtained, whereas 4-nonylphenol has a very low solubility (5 ppm) [20] in the aqueous phase, which is beneficial for SIR processes.…”

“…After validating the high capacity of 43 g CP/kg SIR [19], the aim of the here presented study was to characterize the performance of a SIR consisting of Amberlite XAD4 resins impregnated with the brominated solvent for the selective recovery of CP from a mixture of acetic acid (HAc) and succinonitrile (SN), the molecular structures of the solutes are given in Fig. 2.…”