Experimental modeling of platinum sorption on organic matter |
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| Institution: | 1. Jadavpur University, Kolkata, India;2. Osaka City University, Osaka, Japan;3. Tanta University, Tanta, Egypt;4. Anna University, Chennai, India;5. University of Pretoria, Pretoria, South Africa;1. Geocom Consultants, Benitachell, Spain;2. Geological Institute, Adam Mickiewicz University, Poznań, Poland;1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;2. Key Laboratory of Stratigraphy and Paleontology, Ministry of Land and Resources, Beijing 100037, China;3. School of Earth and Environment, The University of Western Australia, Crawley, WA 6009, Australia;4. The Beijing SHRIMP Centre, National Science and Technology Infrastructure, Beijing 102206, China |
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| Abstract: | In connection with the discovery of a new type of Pt deposit in low-rank brown coals and black shales, the interaction of Pt-bearing aqueous solutions with fractionated organic matter (asphaltenes and asphaltenic acids) was studied at 200–400°C and 1 kbar total pressure. It was found that chemical sorption onto the organic matter lowers Pt content in the aqueous solutions by about two orders of magnitude relative to organic-free systems. Thermal maturation of the asphaltenes leads to its aromatization and concomitant sorption of Pt from n×10−4 mPt (mol per kg of dry matter) at 200°C to n×10−2 mPt at 400°C. Thus, the Pt chemisorption on activated carbonized organic matter may be an effective mechanism of Pt accumulation in C-bearing rocks. |
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