Study of H2O adsorption on sulfides surfaces and thermokinetic analysis |
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| Affiliation: | 1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China;2. College of Material Science and Engineering, Guangxi University, Nanning 530004, China;3. College of Resources and Metallurgy, Guangxi University, Nanning 530004, China;4. College of Physics Science and Engineering, Guangxi University, Nanning 530004, China;1. Beijing National Laboratory for Molecular Sciences, Fundamental Science Laboratory on Radiochemistry & Radiation Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China;2. Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai, 519082, China;3. CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;4. Environmental Geochemistry Group, ISTerre, University of Grenoble I, 38041 Grenoble, France;1. College of Resources and Metallurgy, Guangxi University, Nanning 530004, China;2. College of Material Science and Engineering, Guangxi University, Nanning 530004, China;1. Guangxi Colleges and Universities Key Laboratory of Chemical and Biological Transformation Process Technology, School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530006, China;2. School of Resources and Metallurgy, Guangxi University, Nanning 530004, China;1. Innovation Center for Metal Resources Utilization and Environment Protection, College of Resources and Metallurgy, Guangxi University, Nanning, 530004, China;2. Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Guangxi University, Nanning, 530004, China;3. College of Resources and Metallurgy, Guangxi University, Nanning, 530004, China |
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| Abstract: | Adsorption of water on mineral surfaces was studied using density functional theory and microcalorimetry technique. The calculation results show that galena and molybdenite are hydrophobic, while pyrite and sphalerite is hydrophilic. Thermokinetic analysis shows that the heat of adsorption is in decreasing order of pyrite, sphalerite, galena and molybdenite, which is in good agreement with the calculation results. The adsorption kinetics parameters of hydrophobic galena and molybdenite surfaces are close, while those of hydrophilic pyrite and sphalerite surfaces are very different. The adsorption rate of water on the sphalerite surface is larger than that of water on the pyrite surface. |
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| Keywords: | Water adsorption Sulfide minerals Density functional theory Microcalorimetry Thermokinetic |
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