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研究报告

基金项目：山西省科技重大专项计划（No.20131101028）；山西省回国留学人员科研资助项目（No.2013-重点2）；太原科技大学博士启动基金（No.20142042）

摘要：以可溶性淀粉作为稳定剂制备纳米Fe₃O₄粒子，探讨了反应时间、pH值、初始砷浓度和腐殖酸对Fe₃O₄纳米粒子吸附水体中As（V）的吸附效果影响.实验结果表明，淀粉稳定的Fe₃O₄纳米粒子对水体中As（V）的吸附动力学过程符合准二级动力学，吸附等温线符合Langmuir吸附模型；吸附容量随着溶液pH的增加逐渐降低，在pH为8.0的弱碱性水体中对As（V）的最大吸附容量可达202.56 mg·g^-1；此外，腐殖酸（HA）能降低纳米粒子对As（V）的吸附能力.

Abstract：The Fe₃O₄ nanoparticles stabilized by starch were synthesized.The effects of reaction time, pH value, initial As(V) concentration and humic acid on the adsorption of As(V) on Fe₃O₄ nanoparticles were investigated.Results show that the adsorption process of As(V) on starch-stabilized Fe₃O₄ followed the pseudo-second-order kinetic equation.The equilibrium adsorption data fit to Langmuir adsorption model.Adsorption capacity of the Fe₃O₄ nanoparticles decreased with the increase of pH value, and the maximum adsorption capacity of 202.56 mg·g^-1 was obtained at pH 8.0.Humic acids reduces the adsorption of As(V) on starch-stabilized Fe₃O₄ nanoparticles.