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A promising stable chitosan-Fe (III) adsorbent for arsenate removal from drinking water
(Taylor & Francis Group (Reino Unido), 2023) Todd-Supuy, S.; González-Rodríguez, R.; Caballero-Chavarria, A.; Rojas-Carrillo, O.; Romero-Esquivel, L.G.
Abstract. Chitosan-Fe (III) beads have been reported as good adsorbents for arsenic. NaOH is normally reported as iron hydroxide precipitating agent and high amounts of washing water is needed to stabilize the pH. In this study, NH4OH was used, as it evaporates easily, a quick rinsing was enough to get neutral pH. Batch kinetic and isotherms tests with 1 mg/L As (V) solutions were carried out. The adsorption process was slow (5d for 80% removal) and followed a pseudo-second order kinetic model, meaning that chemical sorption was the rate-limiting step. However, the adsorption in the kinetic study and the Langmuir adsorption capacity were 8.69 mg/g and 16.22 mg/g respectively. Furthermore, the calculation of adsorption capacity in equilibrium with 10 µg/L (q10) using Freundlich parameters gave 3.15 mg/g. This means that the material has a similar As (V) adsorption capacity (mg/g) to the ones reported for iron-chitosan beads and others adsorbents. Therefore, the material is promising, and further fixed bed studies are recommended.