Effects of phosphate on biotite dissolution and secondary precipitation under conditions relevant to engineered subsurface processes

Physical Chemistry Chemical Physics : PCCP
Lijie ZhangYoung-Shin Jun

Abstract

Brine-mica interfacial interactions affect both the caprock integrity and the fate and transport of reactive fluids at deep subsurface sites. Phosphate naturally exists at low concentration in subsurface brines, and its concentration can be increased significantly during energy-related engineered subsurface processes. However, our understanding of the influence of phosphate on brine-mica interactions is limited, especially under subsurface conditions. Here, biotite dissolution experiments were conducted without and with phosphate (0.1, 1, and 10 mM) at 95 °C and 102 atm CO2. Compared to the control, 0.1 mM, and 1 mM phosphate systems, biotite dissolution was four times higher with 10 mM phosphate. Despite the dissolution differences, in all the phosphate systems, phosphate interacted with Al and Fe sites in biotite, forming surface complexation and precipitating as Fe- or Al-bearing minerals on surfaces and in solutions. Consequently, aqueous Fe and Al concentrations became lower with phosphate than in the control experiments. In addition, the biotite basal surfaces became more hydrophilic after reaction with phosphate, even at 0.1 mM, mainly from phosphate adsorption. This study offers new information on how phosphate-containi...Continue Reading

References

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Sep 20, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Yandi Hu, Young-Shin Jun
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Jul 8, 2017·Accounts of Chemical Research·Young-Shin JunQingyun Li

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Citations

Mar 7, 2019·Physical Chemistry Chemical Physics : PCCP·Lijie ZhangYoung-Shin Jun
Apr 19, 2018·Environmental Science & Technology·Lijie ZhangYoung-Shin Jun
Jul 27, 2018·Environmental Science & Technology·Lijie Zhang, Young-Shin Jun

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Methods Mentioned

BETA
X-ray
infrared spectroscopy
atomic force microscopy
AFM
electron
electron diffraction

Software Mentioned

Nanoscope
Geochemist s Workbench ( GWB

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