Photodissolution of Rare Earth Elements and Dissolved Organic Carbon from Subbituminous Coal: Effects of Environmental Variables and Implications for Biogeochemical Cycling
Photodissolution of Rare Earth Elements and Dissolved Organic Carbon from Subbituminous Coal: Effects of Environmental Variables and Implications for Biogeochemical Cycling
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DOI：
10.1021/acs.estlett.3c00545
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发表时间：
2023-08
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通讯作者：
Maxwell L. Harsha;Elizabeth A. Whisenhant;Deja Hebert;Janelle Y. Do;C. Pham;P. Zito;D. Podgorski;P. Tomco
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作者：
Maxwell L. Harsha;Elizabeth A. Whisenhant;Deja Hebert;Janelle Y. Do;C. Pham;P. Zito;D. Podgorski;P. Tomco
稀土元素（REEs）是一组独特的元素，在能源，医学和技术方面有着广泛的应用。全球需求不断增加，而供应有限，这促使人们探索从煤炭等来源提取国内原料的经济可行性。由于环境驱动的光溶解过程，人们对煤中稀土元素的释放知之甚少。在这项研究中，水溶性稀土和溶解有机碳（DOC）从次烟煤的光溶解进行了研究，使用实验室模拟阳光照射。考察了光照强度、温度和光照时间对光溶解的影响。照射后，水溶性REE和DOC浓度显着增加，高于非辐照对照，表明光溶解是一个重要的过程。光照强度和曝光时间都影响光溶解速率，而温度则不影响。从这项研究的结果提供了动力，以进一步研究从次烟煤和DOC配体的相互作用的稀土元素的光溶解途径，鉴于光增溶的稀土元素可能是有机相关的。这些研究结果可能对稀土元素的环境影响产生积极和消极的影响。
Rare earth elements (REEs) make up a group of unique elements with diverse applications in energy, medicine, and technology. Increasing global demand and limited supplies have led to exploring the economic viability of domestic feedstock extraction from sources such as coal. Little is known about the release of REEs from coal due to the environmentally driven processes of photodissolution. In this study, the photodissolution of water-soluble REEs and dissolved organic carbon (DOC) from subbituminous coal was investigated using laboratory-simulated sunlight exposures. The effects of the solar intensity, temperature, and exposure time on photodissolution were also examined. Following irradiation, water-soluble REE and DOC concentrations increased significantly above nonirradiated controls, indicating photodissolution is a significant process. Both solar intensity and exposure time influenced photodissolution rates, while temperature did not. Results from this study provide motivation to further investigate the photodissolution pathways of REEs from subbituminous coal and interaction with DOC ligands, given that photosolubilized REEs may be organic associated. These findings may have implications, both positive and negative, for the environmental impact of REEs.