Hazardous arsenite removal from water by calcined Fe-hydrotalcite


BOYRAZ T., TÜRK T., ALP İ.

Desalination and Water Treatment, vol.317, 2024 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 317
  • Publication Date: 2024
  • Doi Number: 10.1016/j.dwt.2024.100111
  • Journal Name: Desalination and Water Treatment
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), Biotechnology Research Abstracts, CAB Abstracts, Environment Index, Geobase, Pollution Abstracts, Veterinary Science Database, Civil Engineering Abstracts
  • Keywords: Arsenite removal, Boron ore, Calcination, Fe-Hydrotalcite (FeHT), Regeneration
  • Karadeniz Technical University Affiliated: Yes

Abstract

This study is aimed at using calcined Fe-Hydrotalcite (CFeHT) in removing arsenite (As(III)) from water. The arsenic concentration of solutions containing 1000 μg/L As(III) in adsorption studies was reduced below the permissible value (10 μg/L) with 2 g/L CFeHT for As(III). The effect of initial pH on adsorption was limited, and arsenic adsorption occurred relatively quickly under the pseudo-second-order kinetic model. In equilibrium isotherm studies, experimental data were consistent with Langmuir isotherm. Also, we clarified that CFeHT can be reused with proper treatments such as desorption and revivification. Competitive ions such as B(OH)42 did not significantly affect arsenic adsorption. It was determined that the adsorption process with CFeHT has high selectivity towards arsenic and is not affected by high amounts of borate anions in water. As a result of the regeneration tests, the arsenic removal efficiency from the solution containing As(III) was 62% at the end of the fourth cycle. This study reveals the great potential of CFeHT in removing arsenite contamination from groundwater originating from mines, especially from boron mines.