Crosslinked polyDADMAC gels as highly selective and reusable arsenate binding materials

Pirgalioglu S., Ozbelge T. A., Ozbelge H. O., Bicak N.

CHEMICAL ENGINEERING JOURNAL, vol.262, pp.607-615, 2015 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 262
  • Publication Date: 2015
  • Doi Number: 10.1016/j.cej.2014.10.015
  • Journal Name: CHEMICAL ENGINEERING JOURNAL
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.607-615
  • Keywords: Hydrogel, Diallyldimethylammonium chloride (DADMAC), Arsenic(V), N,N '-tetraallylpiperaziniumdichloride (TAP), Arsenic removal, Ion exchange, CATIONIC HYDROGELS, SORPTION KINETICS, OXIDE BEHAVIOR, V REMOVAL, DYE, POLYELECTROLYTE, NANOCOMPOSITES, ADSORBENTS, ADSORPTION, POLYMERS
  • Middle East Technical University Affiliated: Yes

Abstract

High porosity cationic hydrogels synthesized via crosslinking co-polymerization of diallyldimethylammonium chloride (DADMAC) with N,N'-tetraallylpiperaziniumdichloride (TAP) showed high affinity towards arsenate anions over a wide pH range within notably short periods. Batch tests indicated that poly(DADMAC) hydrogels removed 99% of the arsenate anions from aqueous solutions at pH 6-10 and exhibited a maximum arsenic removal capacity of 0.12 g arsenic per gram of hydrogel. DADMAC hydrogels performed well at various pH levels after a short contact time (i.e., 10 min). Evidence of the ion exchange mechanism was based on experiments with solutions containing competing chloride and sulfate ions. An "intra-particle diffusion model" was proposed for the kinetics of arsenic removal. This gel was determined to be a good candidate for use in practice due to its easy regeneration either by treating with a 8.24 g/L of NaCl solution or by reducing the pH of the medium to below 1.0. (C) 2014 Elsevier B.V. All rights reserved.