Immobilization of hydrous iron oxides in porous alginate beads for arsenic removal from water

Abinashi Sigdel, Joowan Lim, Jeongwon Park, Hyoeun Kwak, Sojin Min, Keehong Kim, Hosung Lee, Chang Hyun Nahm, Pyung Kyu Park

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


For removal of arsenic in the aqueous phase, hydrous iron oxides (HIOs) were immobilized in alginate beads with enhanced porosity (designated as HIO-P-alginate beads). The HIO-P-lginate beads had macropores, observed by SEM, as well as mesopores and featured a higher BET surface area than previously developed adsorbent beads. Thus, the adsorption of As(iii) and As(v) by the HIO-P-alginate beads was more rapid than that of previously reported HIO-alginate adsorbents. The kinetics of adsorption were well described by a pseudo-second-order model, indicating that chemisorption mainly governed the As(iii) and As(v) adsorption. We confirmed a chemisorption mechanism for the As(iii) and As(v) adsorption, through isotherm studies using the Dubinin-Radushkevich isotherm model. The application of an intraparticle diffusion model to the kinetic data suggested that the As(v) adsorption onto the HIO-P-alginate beads was controlled entirely by intraparticle diffusion whereas the As(iii) adsorption was governed by intraparticle diffusion only at short contact times. As(iii) adsorption was highest at neutral pH; however, As(v) adsorption was highest at low pH. Both As(iii) and As(v) adsorption did not compete with nitrate adsorption, and the As adsorption improved with increasing ionic strength. The HIO-P-alginate beads could be regenerated several times with a NaOH solution and were successfully reused for arsenic removal.

Original languageEnglish
Pages (from-to)1114-1123
Number of pages10
JournalEnvironmental Science: Water Research and Technology
Issue number8
Publication statusPublished - 2018 Aug

Bibliographical note

Funding Information:
This work was financially supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (No. 2016R1C1B1009544) and also by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20164030201250).

Publisher Copyright:
© The Royal Society of Chemistry.

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Water Science and Technology


Dive into the research topics of 'Immobilization of hydrous iron oxides in porous alginate beads for arsenic removal from water'. Together they form a unique fingerprint.

Cite this