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Materials 2017, 10(3), 262; doi:10.3390/ma10030262

Separation of Lead with a Novel Ion Separating Agent Prepared by Clothing a Chitin Whisker on a Potassium Tetratitanate Whisker

College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
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Academic Editor: Eric Guibal
Received: 12 January 2017 / Revised: 22 February 2017 / Accepted: 24 February 2017 / Published: 6 March 2017
(This article belongs to the Special Issue Sorption Materials for Environment Purification)
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Abstract

Separation of Pb2+ from Cu2+-Pb2+ mixed solution by a newly-developed ion separating agent was examined, which was obtained by clothing chitin whiskers (ChW) on the surface of potassium tetratitanate whiskers (PTW). The separation capability and mechanism of the ion separating agent (ChW-PTW) was determined, based on the difference of the adsorption isotherm pattern and the adsorption kinetics model between ChW and PTW on Cu2+ and Pb2+, respectively. The results showed that the adsorption process of ChW could be described by Freundlish isotherm. The adsorption affinity of Cu2+ (kF = 0.085·g−1) on ChW was greater than Pb2+ (kF = 0.077 g−1). The adsorption pattern of PTW was inclined to the Langmuir isotherm, and Pb2+ (kL = 310.59 L·mmol−1) could be obviously more easily adsorbed on PTW than Cu2+ (kL = 25.85 L·mmol−1). The experimental data both fitted well with the pseudo-second order kinetics. The reaction rate of Pb2+ (k2 = 4.442 for ChW and k2 = 0.846 for PTW) was greater than that of Cu2+ on both ChW and PTW, while the diffusion rate of intra-particles of PTW was much higher than ChW. The adsorption model of ChW and PTW could illustrate well the separation mechanism of ChW-PTW and allowed for relevant results. View Full-Text
Keywords: ion separating; chitin whisker; potassium tetratitanate whisker; coating ion separating; chitin whisker; potassium tetratitanate whisker; coating
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MDPI and ACS Style

Liu, J.; Li, Q.-G.; Xue, W.-J. Separation of Lead with a Novel Ion Separating Agent Prepared by Clothing a Chitin Whisker on a Potassium Tetratitanate Whisker. Materials 2017, 10, 262.

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