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Adsorption and photodegradation of methylene blue on TiO2-halloysite adsorbents

  • Separation Technology, Thermodynamics
  • Published:
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Abstract

TiO2-halloysite (TiO2-HNT) composites were fabricated by depositing anatase TiO2 on the halloysite (HNT) surfaces with calcination treatment at 100, 200, 300 and 500 °C. The obtained composites were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and X-Ray diffraction (XRD). HNT was attached with TiO2 particles or clusters in sizes of 10–30 nm. With the increasing of calcination temperature, the crystalline of anatase became more perfect, but the structure of HNT could be destroyed at 500 °C. The adsorption and photodegradation of methylene blue (MB) by TiO2-HNTs were investigated. The kinetic adsorption fit the pseudo second-order, and the isotherm data followed the Langmuir model. The maximum adsorption capacities of MB were in the range of 38.57 to 54.29 mg/g. TiO2-HNTs exhibited an efficient photocatalytic activity in the decomposition of MB. For TiO2-HNT calcined at 300 °C, 81.6% MB were degraded after 4 h treatment of UV irradiation.

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Authors and Affiliations

  1. School of Pharmacy, Jiangxi Science and Technology Normal University, Nanchang, Jiangxi, 330013, China

    Yuanyuan Du & Pengwu Zheng

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  1. Yuanyuan Du
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  2. Pengwu Zheng
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Correspondence to Pengwu Zheng.

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Du, Y., Zheng, P. Adsorption and photodegradation of methylene blue on TiO2-halloysite adsorbents. Korean J. Chem. Eng. 31, 2051–2056 (2014). https://doi.org/10.1007/s11814-014-0162-8

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  • DOI: https://doi.org/10.1007/s11814-014-0162-8

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