Enhanced adsorption and reduction performance of nitrate by Fe-Pd-Fe3O4 embedded multi-walled carbon nanotubes

Zeyu Wang; Luyao Dai; Jiachao Yao; Tianjiao Guo; Dzmitry Hrynsphan; Savitskaya Tatsiana; Jun Chen

doi:10.1016/j.chemosphere.2021.130718

Enhanced adsorption and reduction performance of nitrate by Fe-Pd-Fe₃O₄ embedded multi-walled carbon nanotubes

Chemosphere. 2021 Oct:281:130718. doi: 10.1016/j.chemosphere.2021.130718. Epub 2021 May 14.

Authors

Zeyu Wang¹, Luyao Dai², Jiachao Yao³, Tianjiao Guo³, Dzmitry Hrynsphan⁴, Savitskaya Tatsiana⁴, Jun Chen⁵

Affiliations

¹ Interdisciplinary Research Academy, Zhejiang Shuren University, Hangzhou, 310021, PR China.
² College of Environment, Zhejiang University of Technology, Hangzhou, 310032, PR China.
³ College of Biological and Environmental Engineering, Zhejiang Shuren University, Hangzhou, 310021, PR China.
⁴ Research Institute of Physical and Chemical Problems, Belarusian State University, Minsk, 220030, Belarus.
⁵ College of Biological and Environmental Engineering, Zhejiang Shuren University, Hangzhou, 310021, PR China. Electronic address: bec@zjut.edu.cn.

PMID: 34044302
DOI: 10.1016/j.chemosphere.2021.130718

Abstract

Multi walled carbon nanotubes (MWCNTs) have attracted more and more attention as adsorbents due to their excellent adsorption properties. By loading metal particles on MWCNTs, the chemical reduction ability of adsorbed pollutants could be provided, so as to achieve the purpose of adsorption and degradation of pollutants. Therefore, the removal process of NO₃^--N by Fe-Pd-Fe₃O₄/MWCNTs was studied, including rapid adsorption of initial pollutants, gradual reduction of intermediate products and re-adsorption of final products. The results showed that Fe-Pd-Fe₃O₄/MWCNTs completely removed NO₃^--N within 2 h, 39% and 25% of which were converted into NO₂^--N and NH₄⁺-N. The adsorption efficiency, kinetics, capacity and adsorption energy all followed the order of NH₄⁺-N > NO₂^--N > NO₃^--N. With the recoverability and reusability of Fe-Pd-Fe₃O₄/MWCNTs having been confirmed in 5 consecutive cycles, the removal rate of NO₃^--N still reached 43%. It has been shown that MWCNTs prolonged the reducing power for NO₃^--N, due to avoiding the aggregation of metal particles. The rapid adsorption of initial pollutants, effective stepwise reduction and convenient recovery processes were of great value for the rehabilitation of polluted water.

Keywords: Adsorption; Fe–Pd–Fe(3)O(4)/MWCNTs; NO(3)(−)-N; Recovery; Reduction.

MeSH terms

Adsorption
Kinetics
Nanotubes, Carbon*
Nitrates
Nitrogen Oxides
Water Pollutants, Chemical* / analysis

Substances

Nanotubes, Carbon
Nitrates
Nitrogen Oxides
Water Pollutants, Chemical