王文祥,蔡月梅

• 1:潍坊学院建筑工程学院

摘要(Abstract)：

为解决粉末蒙脱土使用后难以泥水分离以及材料吸附能力较差等问题,通过共沉淀法制备Fe_3O_4@蒙脱土复合材料,并通过氨基修饰磁性蒙脱土(N-Fe_3O_4@MT),研究了初始pH、投加量、共存离子、吸附时间和温度等因素对N-Fe_3O_4@MT去除As(Ⅴ)的影响,探讨吸附动力学和吸附等温线特征。通过元素分析、扫描电镜(SEM)、傅里叶红外光谱(FTIR)、X射线衍射(XRD)和X射线光电子能谱(XPS)分析As(Ⅴ)吸附去除的机理。结果表明,N-Fe_3O_4@MT在pH=3.0、固液比为0.6 g/L和吸附时间240 min的适宜条件下,在温度30℃时对As(Ⅴ)的最大吸附量为59.93 mg/g。拟二级动力学模型和Langmuir吸附等温模型能更好地描述N-Fe_3O_4@MT对As(Ⅴ)的吸附行为。As(Ⅴ)吸附去除机理主要包括静电作用和络合作用。通过5次吸附-解吸试验后,N-Fe_3O_4@MT对As(Ⅴ)去除率均在85%以上,表明N-Fe_3O_4@MT能实现较好的固液分离,且具备高效的重复利用率,这为修复酸性含As(Ⅴ)废水污染提供了一种高效、环保和经济的吸附材料。

关键词(KeyWords)： 蒙脱土;Fe_3O_4;氨基改性;As(Ⅴ);吸附

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(41702280);; 中国地质调查局地质调查项目(DD20160292)

作者(Author): 王文祥,蔡月梅

DOI: 10.13928/j.cnki.wrahe.2022.01.016

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