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表面活性剂改性Fe3O4对As(Ⅴ)和As(Ⅲ)的吸附（急）
作者:
作者单位:

1.新疆农业大学 资源与环境学院;2.新疆农业大学 数理学院;3.新疆农业大学 水利与土木工程学院

中图分类号:

TQ630 ；X501

基金项目:

新疆维吾尔自治区自然科学基金(2022D01B20)；新疆水利工程安全与水灾害防治重点实验室2022年开放课题(ZDSYS-JS-2022-13)；国家自然科学基金(41761097、42007161、42067035)；第67批中国博士后科学基金会面上项目(2020M673643XB)


Adsorption of As(Ⅴ) and As(Ⅲ) by surfactant-modified Fe3O4
Author:
Affiliation:

1.College of Resource and Environment,Xinjiang Agricultural University;2.College of Mathematics and Physics,Xinjiang Agricultural University;3.College of Water Conservancy and Civil Engineering,Xinjiang Agricultural University

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    摘要:

    利用三种构型的阳离子表面活性剂〔十六烷基三甲基溴化铵(CTAB)、二亚甲基-1,2-二(N-十二烷基-N，N-二甲基溴化铵) (Gemini 12-2-12)和溴化十烃季胺(Bola)〕分别修饰Fe3O4纳米颗粒，制得Fe3O4@CTAB、Fe3O4@Gemini和Fe3O4@Bola纳米颗粒(三者统称Fe3O4@surfactants)。将其用于水中As(Ⅴ)和As(Ⅲ)的处理。通过XRD、TEM、FTIR和磁性测量系统(VSM)对其形貌进行了表征，同时对As(Ⅴ)和As(Ⅲ)的吸附进行吸附动力学、吸附等温模型拟合和吸附行为研究，并考察了Fe3O4@surfactants的吸附-解吸再生循环性能及结构稳定性。结果表明，Fe3O4@surfactants对As(Ⅴ)的吸附效果均高于As(Ⅲ)，吸附符合准二级动力学模型和Langmuir吸附等温模型，且Gemini 12-2-12表面活性剂所修饰的Fe3O4纳米颗粒的吸附容量最大。该吸附过程的吸附驱动力主要来自阳离子表面活性剂分子在固液界面的排列行为、表面活性剂头基与阴离子的静电作用以及尾链与As(Ⅴ)、As(Ⅲ)之间的配位作用。以去除效率较高的As(Ⅴ)进行循环实验，经过5次吸附-解吸循环实验后，Fe3O4@surfactants对As(Ⅴ)的吸附率依然维持在85%左右，且纳米颗粒回收率均在90%以上。

    Abstract:

    By using three configurations of cationic surfactants〔cetyltrimethylammonium bromide(CTAB), Dimethylene-1,2-bis(N-dodecyl-N,N-dimethylammonium bromide)(Gemini 12-2-12) and decamethonium bromide(Bola)〕modified Fe3O4 nanoparticles to produce Fe3O4@CTAB, Fe3O4@Gemini and Fe3O4@Bola (all three are collectively called Fe3O4@surfactants). Respectively, which were used for the treatment of As(Ⅴ) and As(Ⅲ) in water. The morphology was characterized by XRD, TEM, FTIR and magnetic measurement system(VSM), while the adsorption kinetics, adsorption isotherm model fitting and adsorption behavior of As(Ⅴ) and As(Ⅲ) were studied, and the adsorption-desorption regeneration cycle performance and structural stability of Fe3O4@surfactants were investigated. The results showed that the adsorption effect of Fe3O4@surfactants on As(Ⅴ) was higher than that of As(Ⅲ), the adsorption was consistent with the quasi-secondary kinetic model and the Langmuir adsorption isotherm model, and the adsorption capacity of Fe3O4 nanoparticles modified by Gemini 12-2-12 surfactant was the largest. The adsorption driving force of this adsorption process mainly comes from the arrangement behavior of cationic surfactant molecules at the solid-liquid interface, the electrostatic interaction between the surfactant head group and the anion, and the coordination between the tail chain and As(Ⅴ) and As(Ⅲ). The cycle experiment was conducted with As(Ⅴ), which has a high removal efficiency. After five adsorption-desorption cycles, the adsorption rate of As(Ⅴ) by Fe3O4@surfactants was still maintained at about 85%, and the recovery of nanoparticles were all above 90%.

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赵尉伶,杜泽,任星屿,孙英,周金龙,杨方源.表面活性剂改性Fe3O4对As(Ⅴ)和As(Ⅲ)的吸附（急）[J].精细化工,2022,39(11):

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  • 收稿日期:2022-05-25
  • 最后修改日期:2022-06-21
  • 录用日期:2022-07-04
  • 在线发布日期: 2023-08-14
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