EARTH

[3913-23-04] Efficient removal of antimony(V) from aqueous solution by synthesized FeS₂/α-Fe₂O₃ composite

Xingyu He¹, Tianyu Peng¹, ○Yong Ke^1,2, Tianyu Wang¹, Xiaobo Min^1,2 (1. Central South University, 2. Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution)

司会（Chairman）：Atsushi Shibayama （Akita University）, Mikiya Tanaka (AIST)

キーワード：FeS2/α-Fe2O3 composite, pyrite, Sb(V), wastewater, adsorption

In this study, the adsorption performance of pyrite and modified pyrite for the removal of Sb(V) from aqueous solution was investigated. The influence of initial Sb(V) concentration, temperature, solution pH, contact time and coexisting anions on the Sb(V) adsorption were investigated by the batch method. The modified pyrite had the larger maximum Sb(V) adsorption capacity, which was nearly two times higher than that of pyrite. Thermodynamic parameters (ΔG⁰, ΔH⁰ and ΔS⁰) indicated that Sb(V) adsorption on the modified pyrite was feasible, endothermic, and spontaneous. Additionally, the isotherm adsorption and kinetic parameters indicated that the adsorption of Sb(V) onto pyrite and modified pyrite was well fitted with the Langmuir and pseudo-second-order model. Furthermore, modified pyrite exhibited a wide pH range for the Sb(V) adsorption. The coexisting anions had little influence on the Sb(V) removal by modified pyrite. From a practical viewpoint, modified pyrite is a promising candidate for Sb(V) wastewater remediation due to the high Sb(V) adsorption capacity, low-cost, nontoxicity and easy-availability.