A Novel Anion Exchange Membrane for Bisulfite Anion Separation by Grafting a Quaternized Moiety through BPPO via Thermal-Induced Phase Separation

Ion-exchange membranes are the core elements for an electrodialysis (ED) separation process. Phase inversion is an effective method, particularly for commercial membrane production. It introduces two different mechanisms, i.e., thermal induced phase separation (TIPS) and diffusion induced phase separation (DIPS). In this study, anion exchange membranes (AEMs) were prepared by grafting a quaternized moiety (QM,2-[dimethylaminomethyl]naphthalen-1-ol) through brominated poly (2,6-dimethyl-1,4-phenylene oxide) (BPPO) via the TIPS method. Those membranes were applied for selective bisulfite (HSO3−) anion separation using ED. The membrane surface morphology was characterized by SEM, and the compositions were magnified using a high-resolution transmission electron microscope (HRTEM). Notably, the membranes showed excellent substance stability in an alkali medium and in grafting tests performed in a QM-soluble solvent. The ED experiment indicated that the as-prepared membrane exhibited better HSO3− separation performance than the state-of-the-art commercial Neosepta AMX (ASTOM, Japan) membrane.

Complete charge separation provoked by full cation encapsulation in the radical mono- and di-anions of 5,6:11,12-di-o-phenylene-tetracene

Full encapsulation of the K+counterions between two benzo-15-crown-5-ether (B15C5) ligands results in a (κ10O) environment which ensures a complete cation/anion separation resulting in planar bare anionic PAH species [LDOPT˙−] and [LDOPT2−].

Functionalization of orange waste with phosphoric group for Anion separation

A novel adsorbent, Phosphorylated Orange Juice Residue, POJR, has been investigated. The extent of phosphorylation was measured with the aid of fluorescence X-ray crystallography, which indicates that the degree of phosphorylation is 1.2. The POJR has very high binding affinity for ferric ion. Also bound ferric ions selectively adsorb anions like arsenite, arsenate, selenite, selenate, antimonate and phosphate.DOI: http://dx.doi.org/10.3126/jncs.v29i0.9275Journal of Nepal Chemical Society Vol. 29, 2012 Page: 110-112 Uploaded date: 12/6/2013