Environmental Science and Pollution Research

, Volume 23, Issue 6, pp 5609–5617 | Cite as

Statistical investigation on the role of supporting electrolytes during NTA degradation on BDD anodes

  • Jingyu Wu
  • Xiaoming Du
  • Zhenzhu He
  • Chunyong Zhang
  • Degang Fu
Research Article
First Online:
Received:
Accepted:

Abstract

This work reported a comparative study on the electrochemical incineration of nitrilotriacetic acid (NTA) in the presence of different supporting electrolytes (Na2SO4 and NaCl). Galvanostatic electrolyses were conducted in an undivided electrochemical cell containing boron-doped diamond (BDD) anode and platinum cathode. Initial solution pH, flow rate, applied current density, and supporting electrolyte concentration were selected as variables, besides the mineralization efficiency of NTA that was selected as response. Central composite rotatable design and response surface methodology were employed here to examine the statistical significance of the selected variables, as well as to determine the optimal conditions of the degradation process. Under the same operating conditions, two regression models were thus constructed to illustrate the differing impact of supporting electrolytes in BDD anode cells. The kinetics for NTA degradation followed different reaction orders for the two scenarios (in the absence and presence of NaCl), indicating the complex interaction between hydroxyl radicals and active chlorine. Despite this, the experimental results demonstrated that effective mineralization of NTA might also be achieved in the presence of chlorides (of lower concentrations). Besides, in the case of chlorides, the average mass transfer coefficient of the system was found to be strongly dependent on the initial solution pH. Lastly, a plausible reaction sequence concerning the electrolytic oxidation of NTA in chloride media was also proposed.

Keywords

Boron-doped diamond Nitrilotriacetic acid Response surface methodology Degradation Supporting electrolyte 
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Notes

Acknowledgments

This study is supported by Fundamental Research Fund for the Central Universities, Nanjing Agricultural University (KYZ201219). We wish to express our sincere thanks to the Editor and reviewers for their helpful comments and suggestions.

Compliance with ethical standards

All authors have approved the publication of this article in its present form.

Conflict of interest

The authors declare that they have no competing interests.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Jingyu Wu
    • 1
  • Xiaoming Du
    • 1
  • Zhenzhu He
    • 1
  • Chunyong Zhang
    • 1
    • 2
  • Degang Fu
    • 2
    • 3
  1. 1.Department of Chemistry, College of ScienceNanjing Agricultural UniversityNanjingChina
  2. 2.Suzhou Key Laboratory of Environment and BiosafetySuzhou Academy of Southeast University, Dushuhu Lake Higher Education TownSuzhouChina
  3. 3.State Key Laboratory of BioelectronicsSoutheast UniversityNanjingChina

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