Reduction of perchlorate using zero-valent titanium (ZVT) anode

Kinetic models

Chunwoo Lee, Bill Batchelor, Sung Hyuk Park, Dong Suk Han, Ahmed Abdel-Wahab, Timothy A. Kramer

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The kinetics of perchlorate reduction by zero-valent titanium (ZVT) undergoing electrical pitting corrosion was described by interactions of two domains (pit and solution). Two kinetic models were developed based on two possible inhibition mechanisms. A competitive adsorption model was developed based on surface coverage of perchlorate and chloride on bare ZVT, and a Ti(II) consumption model was developed based on Ti(II) oxidation by electrochemically developed chlorine. Both models well predicted perchlorate concentration changes in the solution. The competitive adsorption model showed that chloride has a higher adsorption affinity on both sites where oxidative dissolution of ZVT occurs and where chloride oxidation occurs. Also, the rates of perchlorate removal and chloride oxidation were directly proportional to current applied. For the Ti(II) consumption model, the rate constant of Ti(II) production was dependent on current. The rate of chloride oxidation is also believed to be proportional to current, but this conclusion cannot be made with confidence. Both kinetic models described changes in perchlorate concentration well. However, the Ti(II) consumption model was limited in its ability to predict chloride concentration. This limitation was probably caused by a lack of available information like electrochemical oxidation of chloride on bare ZVT and Ti(II) oxidation by chlorine.

Original languageEnglish
Pages (from-to)122-129
Number of pages8
JournalJournal of Colloid and Interface Science
Volume385
Issue number1
DOIs
Publication statusPublished - 1 Nov 2012

Fingerprint

Titanium
Anodes
Chlorides
Kinetics
Oxidation
Chlorine
Adsorption
perchlorate
Electrochemical oxidation
Pitting
Rate constants
Dissolution
Corrosion

Keywords

  • Anode
  • Kinetic model
  • Perchlorate
  • Reduction
  • Zero-valent titanium

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

Cite this

Reduction of perchlorate using zero-valent titanium (ZVT) anode : Kinetic models. / Lee, Chunwoo; Batchelor, Bill; Park, Sung Hyuk; Han, Dong Suk; Abdel-Wahab, Ahmed; Kramer, Timothy A.

In: Journal of Colloid and Interface Science, Vol. 385, No. 1, 01.11.2012, p. 122-129.

Research output: Contribution to journalArticle

Lee, Chunwoo ; Batchelor, Bill ; Park, Sung Hyuk ; Han, Dong Suk ; Abdel-Wahab, Ahmed ; Kramer, Timothy A. / Reduction of perchlorate using zero-valent titanium (ZVT) anode : Kinetic models. In: Journal of Colloid and Interface Science. 2012 ; Vol. 385, No. 1. pp. 122-129.
@article{3ee0d46680ba4e54af7cd1ed3b6aa87b,
title = "Reduction of perchlorate using zero-valent titanium (ZVT) anode: Kinetic models",
abstract = "The kinetics of perchlorate reduction by zero-valent titanium (ZVT) undergoing electrical pitting corrosion was described by interactions of two domains (pit and solution). Two kinetic models were developed based on two possible inhibition mechanisms. A competitive adsorption model was developed based on surface coverage of perchlorate and chloride on bare ZVT, and a Ti(II) consumption model was developed based on Ti(II) oxidation by electrochemically developed chlorine. Both models well predicted perchlorate concentration changes in the solution. The competitive adsorption model showed that chloride has a higher adsorption affinity on both sites where oxidative dissolution of ZVT occurs and where chloride oxidation occurs. Also, the rates of perchlorate removal and chloride oxidation were directly proportional to current applied. For the Ti(II) consumption model, the rate constant of Ti(II) production was dependent on current. The rate of chloride oxidation is also believed to be proportional to current, but this conclusion cannot be made with confidence. Both kinetic models described changes in perchlorate concentration well. However, the Ti(II) consumption model was limited in its ability to predict chloride concentration. This limitation was probably caused by a lack of available information like electrochemical oxidation of chloride on bare ZVT and Ti(II) oxidation by chlorine.",
keywords = "Anode, Kinetic model, Perchlorate, Reduction, Zero-valent titanium",
author = "Chunwoo Lee and Bill Batchelor and Park, {Sung Hyuk} and Han, {Dong Suk} and Ahmed Abdel-Wahab and Kramer, {Timothy A.}",
year = "2012",
month = "11",
day = "1",
doi = "10.1016/j.jcis.2012.06.075",
language = "English",
volume = "385",
pages = "122--129",
journal = "Journal of Colloid and Interface Science",
issn = "0021-9797",
publisher = "Academic Press Inc.",
number = "1",

}

TY - JOUR

T1 - Reduction of perchlorate using zero-valent titanium (ZVT) anode

T2 - Kinetic models

AU - Lee, Chunwoo

AU - Batchelor, Bill

AU - Park, Sung Hyuk

AU - Han, Dong Suk

AU - Abdel-Wahab, Ahmed

AU - Kramer, Timothy A.

PY - 2012/11/1

Y1 - 2012/11/1

N2 - The kinetics of perchlorate reduction by zero-valent titanium (ZVT) undergoing electrical pitting corrosion was described by interactions of two domains (pit and solution). Two kinetic models were developed based on two possible inhibition mechanisms. A competitive adsorption model was developed based on surface coverage of perchlorate and chloride on bare ZVT, and a Ti(II) consumption model was developed based on Ti(II) oxidation by electrochemically developed chlorine. Both models well predicted perchlorate concentration changes in the solution. The competitive adsorption model showed that chloride has a higher adsorption affinity on both sites where oxidative dissolution of ZVT occurs and where chloride oxidation occurs. Also, the rates of perchlorate removal and chloride oxidation were directly proportional to current applied. For the Ti(II) consumption model, the rate constant of Ti(II) production was dependent on current. The rate of chloride oxidation is also believed to be proportional to current, but this conclusion cannot be made with confidence. Both kinetic models described changes in perchlorate concentration well. However, the Ti(II) consumption model was limited in its ability to predict chloride concentration. This limitation was probably caused by a lack of available information like electrochemical oxidation of chloride on bare ZVT and Ti(II) oxidation by chlorine.

AB - The kinetics of perchlorate reduction by zero-valent titanium (ZVT) undergoing electrical pitting corrosion was described by interactions of two domains (pit and solution). Two kinetic models were developed based on two possible inhibition mechanisms. A competitive adsorption model was developed based on surface coverage of perchlorate and chloride on bare ZVT, and a Ti(II) consumption model was developed based on Ti(II) oxidation by electrochemically developed chlorine. Both models well predicted perchlorate concentration changes in the solution. The competitive adsorption model showed that chloride has a higher adsorption affinity on both sites where oxidative dissolution of ZVT occurs and where chloride oxidation occurs. Also, the rates of perchlorate removal and chloride oxidation were directly proportional to current applied. For the Ti(II) consumption model, the rate constant of Ti(II) production was dependent on current. The rate of chloride oxidation is also believed to be proportional to current, but this conclusion cannot be made with confidence. Both kinetic models described changes in perchlorate concentration well. However, the Ti(II) consumption model was limited in its ability to predict chloride concentration. This limitation was probably caused by a lack of available information like electrochemical oxidation of chloride on bare ZVT and Ti(II) oxidation by chlorine.

KW - Anode

KW - Kinetic model

KW - Perchlorate

KW - Reduction

KW - Zero-valent titanium

UR - http://www.scopus.com/inward/record.url?scp=84865349834&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84865349834&partnerID=8YFLogxK

U2 - 10.1016/j.jcis.2012.06.075

DO - 10.1016/j.jcis.2012.06.075

M3 - Article

VL - 385

SP - 122

EP - 129

JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

SN - 0021-9797

IS - 1

ER -