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Title: In Situ Electrochemical Dilatometry of Phosphate Anion Electrosorption

Abstract

Here in this paper we investigate the competitive electrosorption of mono- and divalent phosphate anions through electrochemical desalination- and dilatometry-based experiments. Through in situ dilatometry, we monitor the strain at the electrode surface as anions and cations are electrosorbed. Strain measurements show that the presence of divalent ions promotes a greater than anticipated electrode expansion during cation (Na+) electrosorption. The expansion observed with Na + equaled the expansion observed with HPO 4 2–. Because the ionic radius of Na+ is smaller than that of HPO 4 2–, the symmetric expansion suggests that divalent anions do not completely desorb during electrode regeneration, causing the adverse interactions with the cation during co-ion expulsion. This results in a decrease in desalination performance, indicated by a decreased salt adsorption capacity. Conversely, an expected asymmetric expansion during anion and cation electrosorption occurs with monovalent phosphate anions (H 2PO 4–), indicating that monovalent ions can be effectively replaced by the cation at the electrode surface.

Authors:
 [1];  [1]; ORCiD logo [2]; ORCiD logo [2];  [3]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1]
  1. Georgia Inst. of Technology, Atlanta, GA (United States). George W. Woodruff School of Mechanical Engineering
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
  3. Vanderbilt Univ., Nashville, TN (United States). Dept. of Mechanical Engineering
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1491313
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Environmental Science & Technology Letters (Online)
Additional Journal Information:
Journal Volume: 5; Journal Issue: 12; Journal ID: ISSN 2328-8930
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Moreno, Daniel, Bootwala, Yousuf, Tsai, Wan-Yu, Gao, Qiang, Shen, Fengyu, Balke, Nina, Hatzell, Kelsey B., and Hatzell, Marta C. In Situ Electrochemical Dilatometry of Phosphate Anion Electrosorption. United States: N. p., 2018. Web. doi:10.1021/acs.estlett.8b00542.
Moreno, Daniel, Bootwala, Yousuf, Tsai, Wan-Yu, Gao, Qiang, Shen, Fengyu, Balke, Nina, Hatzell, Kelsey B., & Hatzell, Marta C. In Situ Electrochemical Dilatometry of Phosphate Anion Electrosorption. United States. doi:10.1021/acs.estlett.8b00542.
Moreno, Daniel, Bootwala, Yousuf, Tsai, Wan-Yu, Gao, Qiang, Shen, Fengyu, Balke, Nina, Hatzell, Kelsey B., and Hatzell, Marta C. Wed . "In Situ Electrochemical Dilatometry of Phosphate Anion Electrosorption". United States. doi:10.1021/acs.estlett.8b00542.
@article{osti_1491313,
title = {In Situ Electrochemical Dilatometry of Phosphate Anion Electrosorption},
author = {Moreno, Daniel and Bootwala, Yousuf and Tsai, Wan-Yu and Gao, Qiang and Shen, Fengyu and Balke, Nina and Hatzell, Kelsey B. and Hatzell, Marta C.},
abstractNote = {Here in this paper we investigate the competitive electrosorption of mono- and divalent phosphate anions through electrochemical desalination- and dilatometry-based experiments. Through in situ dilatometry, we monitor the strain at the electrode surface as anions and cations are electrosorbed. Strain measurements show that the presence of divalent ions promotes a greater than anticipated electrode expansion during cation (Na+) electrosorption. The expansion observed with Na+ equaled the expansion observed with HPO42–. Because the ionic radius of Na+ is smaller than that of HPO42–, the symmetric expansion suggests that divalent anions do not completely desorb during electrode regeneration, causing the adverse interactions with the cation during co-ion expulsion. This results in a decrease in desalination performance, indicated by a decreased salt adsorption capacity. Conversely, an expected asymmetric expansion during anion and cation electrosorption occurs with monovalent phosphate anions (H2PO4–), indicating that monovalent ions can be effectively replaced by the cation at the electrode surface.},
doi = {10.1021/acs.estlett.8b00542},
journal = {Environmental Science & Technology Letters (Online)},
issn = {2328-8930},
number = 12,
volume = 5,
place = {United States},
year = {2018},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on November 14, 2019
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