【摘要】 矿山废水中的三价砷具有较强的致癌性，采用常规方法难以实现快速去除。本文采用水热法合成了α-Fe₂O₃纳米颗粒，采用X射线衍射仪（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、漫反射光谱（DRS）等方法对α-Fe₂O₃进行了系统表征，同时考察了柠檬酸钠用量、水热时间、α-Fe₂O₃催化剂掺量、初始溶液pH和浓度等因素对α-Fe₂O₃除砷效果的影响。结果表明：在柠檬酸钠用量为0.2 g、水热时间为8 h的条件下，制备的样品表现出了优异的光催化性能；在α-Fe₂O₃催化剂用量为0.05 g、低浓度碱性含As（Ⅲ）溶液条件下，砷去除率可达95%,催化剂在光照条件下表现出了较强的氧化性，具有优良的吸附性能，可实现三价砷的快速去除；此外，α-Fe₂O₃纳米材料还具有良好的可重复利用性。研究成果可为类似矿山废水的高效处理提供参考。更多还原

【Abstract】 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 irradiation 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.更多还原