Macroscopic and spectral exploration on the removal performance of pristine and phytic acid-decorated titanate nanotubes towards Eu(III)

作者：Wu, Chunfang; Cai, Yawen; Xu, Lin; Xie, Jian; Liu, Zhiyong; Yang, Shitong^*; Wang, Shuao^*

来源：Journal of Molecular Liquids, 2018, 258: 66-73.

DOI：10.1016/j.molliq.2018.02.110

• TNTs
• PA/TNTs
• Eu(III)
• Sorption selectivity
• XPS analysis
• Removal mechanisms

In the present work, the titanate nanotubes (TNTs) were synthesized via the hydrothermal approach and the phytic acid decorated TNTs (PA/TNTs) were prepared by using the one-pot method. Batch technique was adopted to explore the removal performance of TNTs and PA/TNTs towards Eu(III) under various environmental conditions. At pH 4.0 and 5.5, the sorption of Eu(III) on TNTs decreased with increasing NaNO3 concentration, while the removal of Eu(III) by PA/TNTs was independent of ionic strength. The saturated Eu(III) sorption capacities of TNTs and PA/TNTs were calculated to be 9.52 x 10(-4) and 9.57 x 10(-4) mol/g at pH 5.5 and 298 K, being higher than a variety of previously reported adsorbents. PA/TNTs also exhibited high selectivity for capturing Eu(III) from a simulated wastewater containing multiple competing metal ions. According to the Fourier transform infrared spectroscopy (FTIR), solid fluorescence and X-ray photoelectron spectroscopy (XPS) analysis, the predominant removal mechanisms of TNTs and PA/TNTs towards Eu(III) at pH 5.5 were ion exchange/outer-sphere surface complexation and inner-sphere surface complexation, respectively. These experimental findings demonstrated the wide application prospects of TNTs and PA/TNTs for the highly efficient purification of Eu(III)-bearing wastewater.

• 出版日期2018-5-15
• 单位苏州大学