Polyvinyl alcohol-stabilized granular Fe–Mn binary oxide as an effective adsorbent for simultaneous removal of arsenate and arsenite

Gaosheng Zhang, Jinglin Luo, Lei Wang, Xiwang Zhang

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2 Citations (Scopus)

Abstract

A novel granular Fe–Mn (GFM) binary oxide sorbent, with a diameter of approximate 2.0 mm and a length of 2.0–3.0 mm, was successfully prepared using extrusion granulation method in this study. The GFM sorbent is highly porous with a BET-specific surface area of 210.3 m2/g. It shows high effectiveness in simultaneously adsorbing As(V) and As(III). The maximal sorption capacities for As(V) and As(III) are 33.2 and 50.7 mg/g at pH 7.0 ± 0.1, respectively, which are superior to most of granular sorbents reported in the literature. The present Ca2+, Mg2+, humic acids and fulvic acids do not have obvious influence on the arsenic sorption. But, coexisting anions affect negatively arsenic sorption in the following order: H2PO4> SiO32− > HCO3 > SO42−. NaOH solution is an effective eluent for regeneration of the arsenic-loaded GFM. The GFM packed in the fixed-bed column can treat approximately 3400 and 6500 bed volumes of simulated groundwater containing 233 μg/L As(V) and As(III), respectively, before the arsenic concentration in the effluent reached a drinking water limit of 10 μg/L. The features of high effectiveness, selectivity and reusability make the GFM a potential alternative to remove simultaneously As(V) and As(III) from groundwater.

Original languageEnglish
Pages (from-to)2564–2574
Number of pages11
JournalEnvironmental Technology
Volume41
Issue number20
DOIs
Publication statusPublished - 2020

Keywords

  • Arsenic
  • drinking water
  • granulation
  • removal
  • sorption

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