TY - JOUR
T1 - Elucidating CO2 nanobubble interfacial reactivity and impacts on water chemistry
AU - Antonio Cerrón-Calle, Gabriel
AU - Luna Magdaleno, Andre
AU - Graf, John C.
AU - Apul, Onur G.
AU - Garcia-Segura, Sergi
N1 - Funding Information:
The authors thank the financial support provided by NASA through the Maine Space Grant Consortium (MSGC) project EP-22-01 . Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Aeronautics and Space Administration or of the Maine Space Grant Consortium. A.L. Magdaleno and S. Garcia-Segura thank the support of the Western Alliance to Expand Student Opportunities (WAESO) Louis Stokes Alliance for Minority Participation (LSAMP) National Science Foundation (NSF) Cooperative Agreement No. HRD-1619524. Authors would like to acknowledge Yanyang Tang and Ian Shoemaker for the valuable training and experience on the use of the nanotrack analyzer (NTA). Authors are thankful for the discussions with Dr. Christopher M. Matty and Dr. Emily Matula.
Publisher Copyright:
© 2021 Elsevier Inc.
PY - 2022/2
Y1 - 2022/2
N2 - Hypothesis: Carbon dioxide nanobubbles can increase effective gas-transfer to solution and enhance buffering capacity given the stable suspension in water of CO2 gas within nanobubbles and the existence of larger gas/water interface. Experiments: The physico-chemical properties and responses of CO2 nanobubbles were recorded at different generation times (10, 30, 50, and 70 min) and benchmarked against traditional macrobubbles of CO2 for the same amount of delivered gas. Effective concentration of CO2 was evaluated by measuring the buffer capacity (β). The size distribution of nanobubbles during the experiments was measured by Nanoparticle Track Analysis. Findings: The mass transfer coefficient (KLa) showed a dramatically increase by 11-fold for the same volume of gas delivered when using nanobubbles. The β values obtained for nanobubbles were 7 times higher than that of traditional bubbles which can lead to significant source of CO2 availability by using the nanobubble method. Nanobubbles, consequently, undergo mass loss at higher pH corresponding to mass transfer process due to concentration gradient at the surrounding nanobubbles. This is the first report of CO2 nanobubbles buffer capacity evaluation.
AB - Hypothesis: Carbon dioxide nanobubbles can increase effective gas-transfer to solution and enhance buffering capacity given the stable suspension in water of CO2 gas within nanobubbles and the existence of larger gas/water interface. Experiments: The physico-chemical properties and responses of CO2 nanobubbles were recorded at different generation times (10, 30, 50, and 70 min) and benchmarked against traditional macrobubbles of CO2 for the same amount of delivered gas. Effective concentration of CO2 was evaluated by measuring the buffer capacity (β). The size distribution of nanobubbles during the experiments was measured by Nanoparticle Track Analysis. Findings: The mass transfer coefficient (KLa) showed a dramatically increase by 11-fold for the same volume of gas delivered when using nanobubbles. The β values obtained for nanobubbles were 7 times higher than that of traditional bubbles which can lead to significant source of CO2 availability by using the nanobubble method. Nanobubbles, consequently, undergo mass loss at higher pH corresponding to mass transfer process due to concentration gradient at the surrounding nanobubbles. This is the first report of CO2 nanobubbles buffer capacity evaluation.
KW - Buffer capacity
KW - Gas transfer
KW - Nanointerfaces
KW - Nanoparticle track analysis
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U2 - 10.1016/j.jcis.2021.09.033
DO - 10.1016/j.jcis.2021.09.033
M3 - Article
C2 - 34536932
AN - SCOPUS:85114942240
VL - 607
SP - 720
EP - 728
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
SN - 0021-9797
ER -