Chemometric study on the electrochemical incineration of nitrilotriacetic acid using platinum and boron-doped diamond anode

Chunyong Zhang; Zhenzhu He; Jingyu Wu; Degang Fu

doi:10.1016/j.chemosphere.2015.02.018

Chemometric study on the electrochemical incineration of nitrilotriacetic acid using platinum and boron-doped diamond anode

Chemosphere. 2015 Jul:130:1-7. doi: 10.1016/j.chemosphere.2015.02.018. Epub 2015 Mar 3.

Authors

Chunyong Zhang¹, Zhenzhu He², Jingyu Wu², Degang Fu³

Affiliations

¹ Department of Chemistry, College of Science, Nanjing Agricultural University, Nanjing 210095, China; Suzhou Key Laboratory of Environment and Biosafety, Suzhou Academy of Southeast University, Dushuhu Lake Higher Education Town, Suzhou 215123, China. Electronic address: zhangchy@njau.edu.cn.
² Department of Chemistry, College of Science, Nanjing Agricultural University, Nanjing 210095, China.
³ Suzhou Key Laboratory of Environment and Biosafety, Suzhou Academy of Southeast University, Dushuhu Lake Higher Education Town, Suzhou 215123, China; State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, China.

PMID: 25747300
DOI: 10.1016/j.chemosphere.2015.02.018

Abstract

This study investigated the electrochemical incineration of nitrilotriacetic acid (NTA) at boron-doped diamond (BDD) and platinum (Pt) anodes. Trials were performed in the presence of sulfate electrolyte media under recirculation mode. The parameters that influence the degradation efficiency were investigated, including applied current density, flow rate, supporting electrolyte concentration and reaction time. To reduce the number of experiments, the system had been managed under chemometric technique named Doehlert matrix. As a consequence, the mineralization of NTA demonstrated similar behavior upon operating parameters on these two anodes. Further kinetic study indicated that the degradations followed pseudo-first-order reactions for both BDD and Pt anodes, and the reaction rate constant of the former was found to be higher than that of the latter. Such difference could be interpreted by results from fractal analysis. In addition, a reaction sequence for NTA mineralization considering all the detected intermediates was also proposed.

Keywords: Boron-doped diamond; Doehlert design; Fractal analysis; Nitrilotriacetic acid; Platinum.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Boron / chemistry*
Diamond*
Electric Conductivity*
Fractals
Hydrogen-Ion Concentration
Incineration / methods
Kinetics
Models, Statistical
Nitrilotriacetic Acid / analysis*
Oxygen / chemistry
Platinum / chemistry*
Regression Analysis

Substances

Platinum
Diamond
Nitrilotriacetic Acid
Boron
Oxygen