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Roles of Nano- and Micro-Scale Subsu...

Hu, Yandi.

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Roles of Nano- and Micro-Scale Subsurface Geochemical Reactions on Environmentally Sustainable Geologic Carbon Dioxide Sequestration.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Roles of Nano- and Micro-Scale Subsurface Geochemical Reactions on Environmentally Sustainable Geologic Carbon Dioxide Sequestration./
Author:	Hu, Yandi.
Description:	280 p.
Notes:	Source: Dissertation Abstracts International, Volume: 74-09(E), Section: B.
Contained By:	Dissertation Abstracts International74-09B(E).
Subject:	Engineering, Environmental. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3563560
ISBN:	9781303119248

Roles of Nano- and Micro-Scale Subsurface Geochemical Reactions on Environmentally Sustainable Geologic Carbon Dioxide Sequestration.
Hu, Yandi.

Roles of Nano- and Micro-Scale Subsurface Geochemical Reactions on Environmentally Sustainable Geologic Carbon Dioxide Sequestration. - 280 p.

Source: Dissertation Abstracts International, Volume: 74-09(E), Section: B.

Thesis (Ph.D.)--Washington University in St. Louis, 2013.

Geologic CO2 sequestration (GCS) is a promising approach to reduce anthropogenic CO2 emissions into the atmosphere. At GCS sites, injected CO2 is kept in formation rock by an overlying low permeability caprock. During and after CO2 injection, geochemical reactions can affect the porosity, permeability, and pollutant transport in aquifers. Despite their importance, nano- and micro-scale subsurface geochemical reactions are far from well-understood.

ISBN: 9781303119248Subjects--Topical Terms:

783782
Engineering, Environmental.

Roles of Nano- and Micro-Scale Subsurface Geochemical Reactions on Environmentally Sustainable Geologic Carbon Dioxide Sequestration.
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020 $a 9781303119248
035 $a (MiAaPQ)AAI3563560
035 $a AAI3563560
040 $a MiAaPQ $c MiAaPQ
100 1 $a Hu, Yandi. $3 2095383
245 1 0 $a Roles of Nano- and Micro-Scale Subsurface Geochemical Reactions on Environmentally Sustainable Geologic Carbon Dioxide Sequestration.
300 $a 280 p.
500 $a Source: Dissertation Abstracts International, Volume: 74-09(E), Section: B.
500 $a Adviser: Young-Shin Jun.
502 $a Thesis (Ph.D.)--Washington University in St. Louis, 2013.
520 $a Geologic CO2 sequestration (GCS) is a promising approach to reduce anthropogenic CO2 emissions into the atmosphere. At GCS sites, injected CO2 is kept in formation rock by an overlying low permeability caprock. During and after CO2 injection, geochemical reactions can affect the porosity, permeability, and pollutant transport in aquifers. Despite their importance, nano- and micro-scale subsurface geochemical reactions are far from well-understood.
520 $a Clay mobilization has been reported to decrease aquifer permeability during water flooding, and clay minerals are abundant in caprock. Thus, we studied CO2-brine-clay interactions under varied conditions relevant to different GCS sites (at 35-95°C and under 35-120 atm CO2, in water, NaCl, MgCl2, or CaCl2 solutions). Biotite, Fe-bearing mica, was used as a model clay mineral. We observed numerous fibrous illite precipitates on mica after reaction for only 3 h, which had not been previously reported. A few hours later, the mica surface cracked and fibrous illite detached. The mobilization of fibrous illite can decrease the aquifer's permeability greatly and affect the safety and efficiency of GCS. Mechanisms related to ion exchange, mica swelling, and CO2 intercalation were explored. Oriented aggregation of illite nanoparticles forming the fibrous illite was directly observed, suggesting a new mechanism for fibrous illite formation. Interestingly, besides the pH effect, aqueous CO2 enhances mica cracking over N2. These findings can help to achieve safer subsurface operations.
520 $a At GCS field sites, Fe concentration increased near the injection sites and originally adsorbed pollutants were released. As the brine flows, Fe re-precipitated because of pH increase. To better predict the fate and transport of aqueous pollutants, the nucleation and growth of Fe(III) (hydr)oxides were studied. New information about sizes and volumes of the Fe(III) (hydr)oxide nanoparticles precipitated in solution and on quartz, mica, and sapphire were provided using small angle X-ray scattering, in the presence of different ions (Al 3+, Cl-, NO3-, and SO 42-). Using complementary techniques, the controlling mechanisms related to surface charge, bond formation, and interfacial energies were explored. These new findings can help better predict pollutant transport in aquifers not only at GCS sites, but also in managed aquifer recharge and acid mine drainage sites.
590 $a School code: 0252.
650 4 $a Engineering, Environmental. $3 783782
650 4 $a Geochemistry. $3 539092
650 4 $a Nanoscience. $3 587832
650 4 $a Engineering, Geological. $3 1035566
690 $a 0775
690 $a 0996
690 $a 0565
690 $a 0466
710 2 $a Washington University in St. Louis. $b Energy, Environmental & Chemical Engineering. $3 1669538
773 0 $t Dissertation Abstracts International $g 74-09B(E).
790 $a 0252
791 $a Ph.D.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3563560