(1. 湖南科技大学 土木工程学院，湘潭 411201；
2. 湖南景翌湘台环保高新技术开发有限公司，湘潭 411201)
摘 要: 采用共沉淀法将Fe3O4掺杂在富含铈研磨抛光污泥(Hydrous ceric oxide, HCO)中制备出一种新型HCO-(Fe3O4)x复合吸附剂，分别以Sb(Ⅲ)和Sb(Ⅴ)为处理对象，考察了Ce和Fe的摩尔比、pH、投加量和时间对HCO-(Fe3O4)x吸附除锑的影响，并研究了不同n(Ce)/n(Fe)时的等温吸附模型、吸附动力学和吸附机理。结果表明：当n(Ce)/n(Fe)为1:0.67和1:1、pH为3和2、温度为35 ℃条件下，HCO-(Fe3O4)x对Sb(Ⅲ)和Sb(Ⅴ)的最大吸附量分别可以达到46.00 mg/g和58.34 mg/g，能有效去除水中的锑离子；HCO-(Fe3O4)x吸附Sb(Ⅲ)和Sb(Ⅴ)过程均符合Langmuir等温吸附模型和准二级反应动力学模型，以化学吸附为主。EDS、XRD和XPS等表征结果显示：HCO与Fe3O4的复合制备提高了比表面积并形成了FeCe2O4、FeOOH、Fe3O4和Fe2O3等无定型铁氧化物，为吸附过程中Fe-O-Sb和Ce-O-Sb络合物的形成提供了条件，从而促进了Sb(Ⅲ)和Sb(Ⅴ)的吸附去除。
关键字: HCO-(Fe3O4)x吸附剂；Sb(Ⅲ)；Sb(Ⅴ)；吸附机理
（1. School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;
2. Hunan Jingyi Environmental Protection High Tech Development Co., Ltd., Xiangtan 411201, China）
Abstract:A new HCO-(Fe3O4)x composite adsorbent was prepared by co-precipitation method in cerium-rich grinding and polishing sludge(hydrous ceric oxide, HCO), with Sb(Ⅲ) and Sb(Ⅴ) as treatment materials, respectively. The effects of molar ratio of Ce and Fe, pH, dosage and time on the adsorption of antimony by HCO-(Fe3O4)x were investigated. The isothermal adsorption model, adsorption kinetics and adsorption mechanism of HCO-(Fe3O4)x were studied. The results show that HCO-(Fe3O4)x can effectively remove antimony ions from water, and the maximum adsorption capacities of Sb(Ⅲ) and Sb(Ⅴ) can reach 46.00 mg/g and 58.34 mg/g, respectively, under the conditions of molar ratio of Ce and Fe of 1:0.67 and 1:1, pH of 3 and 2, and temperature of 35 ℃. The adsorption processes of Sb(Ⅲ) and Sb(Ⅴ) by HCO-(Fe3O4)x are both in accordance with Langmuir isothermal adsorption model and quasi-second-order reaction kinetics model, with chemical adsorption as the mainstay. The characterization results of EDS, XRD and XPS show that the composite preparation of HCO and Fe3O4 increases the specific surface area and forms amorphous iron oxides, such as FeCe2O4, FeOOH, Fe3O4 and Fe2O3, which provides conditions for the formation of Fe-O-Sb and Ce-O-Sb complexes in the adsorption process and promotes the adsorption removal of Sb(Ⅲ) and Sb(Ⅴ).
Key words: HCO-(Fe3O4)x adsorbent; Sb(Ⅲ); Sb(Ⅴ); adsorption mechanism
