The objective of this study was to investigate the application of manganese oxide [MnO_x(s)] and granular activated carbon (GAC) media for the removal of caffeine and acetaminophen from water. Organic contaminants of emerging concern represent a developing issue due to their effects on human health and the environment. Manganese oxides are effective for water treatment because of their ability to mediate adsorption and oxidation–reduction reactions for many organic and inorganic constituents. Laboratory scale column experiments were performed using different combinations of commercial MnO_x(s) and GAC for assessing the removal of caffeine and acetaminophen, and the subsequent release of soluble Mn due to the reductive dissolution of MnO_x(s). The removal of acetaminophen was detected for all media combinations investigated. However, the removal of caffeine by adsorption only occurred in columns containing GAC media. There was no removal of caffeine in columns containing only MnO_x(s) media. Manganese release occurred in columns containing MnO_x(s) media, but concentrations were below the secondary drinking water standard of 50 μg L⁻¹ set by the US Environmental Protection Agency. Soluble Mn released from a first process by MnO_x(s) media column was removed through adsorption into the GAC media used in a second process. The results of this investigation are relevant for implementation of MnO_x(s) and GAC media combinations as an effective treatment process to remove organic contaminants from water.

中文翻译：

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柱实验中通过MnOx和GAC介质去除对乙酰氨基酚和咖啡因

这项研究的目的是研究氧化锰[MnO _x（s） ]和颗粒状活性炭（GAC）介质在去除水中咖啡因和对乙酰氨基酚中的应用。受到关注的有机污染物由于对人体健康和环境的影响而成为一个发展中的问题。锰氧化物对水的处理非常有效，因为它们能够介导许多有机和无机成分的吸附和氧化还原反应。实验室规模的柱实验使用市售的MnO的不同组合执行_X（S）和GAC用于评估除去咖啡因和对乙酰氨基酚的和可溶性Mn的随后释放由于MnO的的还原溶解_X（s）。对于所研究的所有培养基组合，均检测到对乙酰氨基酚的去除。但是，通过吸附去除咖啡因仅发生在含有GAC介质的色谱柱中。仅包含MnO _x（s）介质的色谱柱中没有去除咖啡因。锰释放发生在含MnO的列_X（S）的媒体，但浓度为50微克L中的二级饮用水标准低于^-1由美国环保署制定的。可溶的Mn从由MnO的第一过程中释放_{X（多个）}媒体柱通过吸附除去成在第二处理中使用的GAC介质。研究结果与实施MnO _{x有关（s）}和GAC介质组合作为从水中去除有机污染物的有效处理过程。