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Preparation of Titanate Whiskers Starting from Metatitanic Acid and Their Adsorption Performances for Cu(II), Pb(II), and Cr(III) Ions

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Abstract

Titanate whiskers were prepared by hydrothermal method starting from hydrous metatitanic acid and potassium hydroxide. The titanate whiskers were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, inductively coupled plasma, and N2 adsorption/desorption techniques. When the concentrations of potassium hydroxide ranged from 6 to 12 mol L−1, titanate whiskers were formed by bundling layer-structured nanoribbons. The titanate whiskers were certified with the formula of H2 − xKxTi3O7 · nH2O (x = 0.6, n = 3.8–4.0). After hydrochloric acid treatment, the potassium content and the layer distance decreased due to the replacement of potassium ions by protons. The maximum adsorption capacities of titanate whiskers for Cu(II), Pb(II), and Cr(III) ions were 142.0, 395.7, and 97.0 mg g−1 when their initial concentrations were 150, 300, and 80 mg L−1, respectively. The adsorption equilibriums were almost established in 30 min. The adsorption of Cu(II), Pb(II), and Cr(III) ions on titanate whiskers followed the pseudo-second-order adsorption kinetics. The Langmuir adsorption isotherms well fitted the adsorption equilibriums of Cu(II) and Pb(II) ions while the Freundlich adsorption isotherm well fitted the adsorption equilibrium of Cr(III) ions.

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Acknowledgments

The authors sincerely thank Prof. K. Chen of Jiangsu University for supporting the SEM and TEM analyses and the financial supports from Chinese PLA 359 Hospital, Jiangsu Province Education Bureau (CX10B-259Z, CXZZ12-0683, 1102120C, 11KJB530002), Jiangsu University for Young Researchers (11JDG028, 2010-4849), and China Postdoctoral Fundation Committee (2011 M500866).

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Correspondence to Hengbo Yin or Aili Wang.

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Hang, Y., Yin, H., Wang, A. et al. Preparation of Titanate Whiskers Starting from Metatitanic Acid and Their Adsorption Performances for Cu(II), Pb(II), and Cr(III) Ions. Water Air Soil Pollut 225, 2095 (2014). https://doi.org/10.1007/s11270-014-2095-6

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