Kinetic and thermodynamic aspects of adsorption of arsenic by granular Fe-based adsorbent

One novel adsorption materials, Mn-loaded iron ore sinter (Mn-IOS), has been conducted to remove arsenate (As (V)) and arsenite (As (III)). The conversion of As (III) to As (V) caused by manganese ion in adsorption progress would be beneficial to adsorption, and therefore, Mn-IOS had a better removal performance of As (III). Results of orthogonal tests suggested that temperature was an important factor, and higher temperature markedly favored the adsorption. The adsorption kinetic data can be well described by pseudo-second-order rate equation with R² >0.999. The adsorption isotherms fitted well with the Langmuir model. No significant effects on As (III) removal were found by the tested anions, chloride, or sulfate, but phosphate really caused the greatest percentage decrease of As (III) adsorption.