采用撞击流-旋转填料床(IS-RPB)结合共沉淀法获取粒径小且分布均匀的FeS粉体,利用浸渍法对其进行负载型改性得到复合材料FeS/Al₂O₃,并利用其进行脱汞性能探究。利用扫描电镜、X射线衍射仪和能谱仪对复合材料的组成和形貌结构进行表征;利用粒度分析仪测试FeS粉体的粒径分布;利用原子吸收分光光度计测试脱汞率,考察吸附剂用量、处理时间、pH、共存离子等对脱汞效果的影响。结果表明,超重力法制备纳米FeS的最佳条件为:c(Fe²⁺)=0.10 mol/L、超重力因子为106.6、撞击初速度为9.43 m/s,此时,得到的FeS的粒径小(D50=91 nm)且分布很窄(68~114 nm)。FeS/Al₂O₃复合材料的脱汞最佳条件为:pH为6、吸附材料质量浓度为2.0 g/L、处理时间为240 min,此时,脱汞率可达99.96%,最大饱和吸附容量为 1 775.9 mg/g,出水质量浓度为0.04 mg/L。

FeS powder with small and uniformly distributed particle size is obtained through using the impinging stream-rotating packed bed (IS-RPB) combined with the coprecipitation method,and is supported and modified through impregnation to prepare FeS/Al₂O₃ composite material that is then used to evaluate mercury removal performance.The composition and morphology of the composite material are characterized by means of scanning electron microscopy,X-ray diffraction,and energy dispersive spectroscopy.The particle size distribution of FeS powder is tested through using a particle size analyzer,and the mercury removal rate is detected by using an atomic absorption spectrophotometer,examining the effects of adsorbent dosage,treatment time,pH,and coexisting ions on mercury removal efficiency.Results indicate that the optimal conditions for preparing nano-FeS via supergravity method are as follows:c(Fe²⁺)=0.10 mol·L^-1,supergravity factor is 106.6,and initial impinging velocity is 9.43 m·s^-1.Under these conditions,the obtained FeS has a small particle size (D50=91nm) and a narrow particle size distribution (68-114 nm).The optimal conditions for mercury removal by FeS/Al₂O₃ composite material are as follows:pH=6,the mass concentration of adsorbent is 2.0 g·L^-1,and treatment time is 240 minutes.Under these conditions,the mercury removal rate can reach 99.96%,with a maximum saturated adsorption capacity of 1 775.9 mg·g^-1 and an effluent concentration of 0.04 mg·L^-1.

吕俊辉(1995-),男,硕士生,研究方向为材料与化工,18236900358@163.com;栗秀萍(1972-),女,博士,教授,研究方向为超重力技术、污水处理,通讯联系人,lxpzhongxin@126.com。