Effect of Water Hardness and pH on Adsorption Kinetic of Arsenate on Iron Oxide | Zendy

Dao Janjaroen | Zendy; Pondetch Dilokdumkeng | Zendy; Preawvanit Jhandrta | Zendy

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Effect of Water Hardness and pH on Adsorption Kinetic of Arsenate on Iron Oxide

Author(s) -

Dao Janjaroen,

Pondetch Dilokdumkeng,

Preawvanit Jhandrta

Publication year - 2018

Publication title -

engineering journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.246

H-Index - 20

ISSN - 0125-8281

DOI - 10.4186/ej.2018.22.2.13

Subject(s) - arsenate , adsorption , kinetic energy , iron oxide , oxide , chemistry , inorganic chemistry , chemical engineering , materials science , arsenic , metallurgy , physics , engineering , quantum mechanics

The adsorption of arsenate on iron oxide particles was studied as a function of pH and hardness concentrations. Morphology of the studied iron oxide surface was rough and irregular. The major chemical composition of iron oxide particles was Fe2O3 (96%). The optimal solution pH for adsorption was 8.0. The equilibrium of arsenic concentration was reached after 1 hour of contact time. The adsorption capacity (qe) increased with increasing iron oxide particles. Freundlich isotherm and pseudo-second order reaction were best descriptors of arsenate adsorption behavior. Calcium or magnesium concentrations did not significantly affect the adsorbed concentration of arsenic at equilibrium. However, arsenate adsorption was higher at low pH and decreased significantly with increasing pH.

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