4.7 Article

Magnetic modification of acid-activated kaolin: Synthesis, characterization, and adsorptive properties

期刊

MICROPOROUS AND MESOPOROUS MATERIALS
卷 202, 期 -, 页码 1-7

出版社

ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2014.09.029

关键词

Kaolin; Maghemite; Nanocomposite; Methylene blue; Adsorption

资金

  1. National Natural Science Foundation of China [21267016, 21367020]
  2. Program for Inner Mongolia Excellence Specialist
  3. Natural Science Foundation of Inner Mongolia [MS0806]

向作者/读者索取更多资源

Maghemite (gamma-Fe2O3) nanoparticles were synthesized onto the surface of acid-activated kaolin (AAK), prepared by calcination and acid activation of a coal bearing kaolin, by immobilizing an Fe-urea complex ([Fe(NH2CONH2)(6)](NO3)(3)) and subsequent calcination. The obtained samples were characterized by X-ray diffraction (XRD), N-2 adsorption-desorption, X-ray photoelectron spectroscopy (XPS), vibrating sample magnetic measurements, and transmission electron microscopy (TEM). The results confirm the formation of ferromagnetic gamma-Fe2O3 nanoparticles, approximately 18 nm in size, onto the AAK surface. The obtained gamma-Fe2O3/AAK nanocomposite has a high Brunauer-Emmett-Teller (BET) surface area of 99.4 m(2)/g and possesses ferromagnetic characteristics with a maximum magnetization of 26.5 emu/g. The adsorption ability of gamma-Fe2O3/AAK nanocomposite was investigated using methylene blue (MB) as a typical pollutant. Owing to its high surface area, the gamma-Fe2O3/AAK nanocomposite showed higher removal efficiency for MB than for parent kaolin, with a maximum adsorption capacity of 50.2 mg/g. The adsorption kinetics of MB fit well with the pseudo-second-order kinetic model, and the equilibrium data can be well described by the Langmuir adsorption model. (C) 2014 Elsevier Inc. All rights reserved.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据