基于α-Fe2O3纳米光催化剂的矿山废水中砷离子的高效去除OA

Trivalent arsenic in mining wastewater has strong carcinogenicity,and it is difficult to achieve rapid removal using conventional methods.In this paper,α-Fe2O3 nanoparticles were synthesized by hydrothermal method.The α-Fe2O3 was systematically characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),diffuse reflectance spectroscopy(DRS)and other methods.The effects of sodium citrate dosage,hydrothermal time,α-Fe2O3 catalyst dosage,initial solution pH and concentration and other factors on the arsenic removal efficiency of α-Fe2O3 were also investigated.The results show that under the conditions of sodium citrate dosage of 0.2 g and hydrothermal time of 8 h,the prepared sample exhibited excellent photocatalytic performance;Under the condition of 0.05 g α-Fe2O3 catalyst dosage and low concentration alkaline solution containing As(Ⅲ),the removal rate of arsenic can reach 95%.The catalyst exhibits strong oxidizing properties under light irra-diation and has excellent adsorption performance,which can achieve rapid removal of trivalent arsenic;In addition,α-Fe2O3 nanomaterials also have good reusability.The research results can provide reference for efficient treatment of similar mining wastewater.