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• W3021396052 abstract "The interactions between O-H groups in kaolinite and re-adsorption water is an important aspect that should be considered in the hydraulic fracturing method for the production of shale gas, because the external water adsorbed by kaolinite in shale would significantly affect the desorption of methane. In this study, the interactions were investigated via changing the amount of O-H groups and re-adsorption water in kaolinite by heating treatment and water re-adsorption. To overcome the overlap of IR vibration bands of the O-H functional groups in H2O and those in parent kaolinite, kaolinite samples with D2O re-adsorption were prepared by drying the H2O from raw kaolinite and soaking the dried kaolinite in D2O. The interactions between O-H groups in kaolinite and D2O molecules were investigated by in situ DRIFT and TG-MS. The results demonstrated that the vibration at 3670 ± 4 cm-1 in the DRIFT spectra could be due to the outer O-H groups of the octahedral sheet on the upper surface of the kaolinite microcrystal structure, rather than a type of inner-surface O-H group. All types of O-H groups, including the inner O-H groups in kaolinite, could be transformed into O-D groups after D2O re-adsorption at room temperature. The inner-surface O-H groups in kaolinite are the most preferred sites for D2O re-adsorption; thus, they would be the key factor for studying the effect of re-adsorption water on methane desorption. When the temperature increased from 100 °C to 300 °C, two layers of kaolinite slipped away from each other, resulting in the transformation of inner-surface O-H groups into outer O-H groups. Thus, the temperature range of 100 to 300 °C was suggested for the heat treatment of kaolinite to decrease the content of inner-surface O-H groups; thereby, the amount of re-adsorption water was reduced. However, to thoroughly remove the re-adsorption water, a temperature higher than 650 °C should be used." @default.
• W3021396052 created "2020-05-13" @default.
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• W3021396052 date "2020-01-01" @default.
• W3021396052 modified "2023-10-15" @default.
• W3021396052 title "<i>In situ</i> study on interactions between hydroxyl groups in kaolinite and re-adsorption water" @default.
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• W3021396052 doi "https://doi.org/10.1039/d0ra01905d" @default.
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