Sorption Characteristics of Arsenic(V) for Removal from Water Using Agglomerated Nanostructure Iron(III)−Zirconium(IV) Bimetal Mixed Oxide

Arsenic(V) sorption reaction with nanostructured hydrous iron(III)−zirconium(IV) bimetal mixed oxide (NHIZO) was investigated experimentally with varying parameters, viz., the effects of pH, contact time, and isotherm equilibrium at (303 ± 1.6) K. The optimum pH estimated ranged between 5.0 and 7.0. The kinetic and equilibrium data (pH 7.0 ± 0.2) described the pseudosecond order and the Langmuir isotherm equations well, respectively. The Langmuir monolayer capacity estimated was (9.3582 ± 0.3116) mg·g−1. Thermodynamics analysis of the data of isotherm equilibrium suggested the endothermic and spontaneous nature of the sorption reaction, and the latter took place with the increase of entropy (ΔS0 = +96.6087 J·mol−1·K−1). The estimation of sorption energy (E = 12.4700 kJ·mol−1) from the Dubinin−Radushkevich (D−R) isotherm analysis had suggested chemisorption of arsenic(V) on NHIZO.