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首页> 外文期刊>Water, Air, and Soil Pollution >Enhanced Heavy Metal Sorption by Surface-Oxidized Activated Carbon Does Not Affect the PAH Sequestration in Sediments
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Enhanced Heavy Metal Sorption by Surface-Oxidized Activated Carbon Does Not Affect the PAH Sequestration in Sediments

机译：表面氧化的活性炭对重金属的吸附作用不会影响沉积物中的PAH螯合

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摘要

We examined the sorption of heavy metals and polycyclic aromatic hydrocarbons (PAHs) to surface-oxidized activated carbon (AC) and its effect on the distribution of those compounds in sediments. Created surface oxygen groups on AC enhanced the sorption of copper, which is superior in sorption com-petition, in the marine sediments. In case of cadmium, aqueous chemistry altered by AC addition, such as pH, has greater impact on the bioavailability according to the result of a sequential extraction combined with the pore water concentration measurements. Oxidized AC exhibited 2.3 times more adsorption of reduced bioavailable copper while 23% of bioavailable cadmi-um was adsorbed onto unmodified AC. No significant changes in BET surface area, pore volume, and AC/ water distribution coefficient (K_(AC)) of PAHs were observed with surface-oxidized AC. The largest dif-ference in K_(AC) after the oxidation was only 0.14 log unit. Consequently, freely dissolved aqueous concen-trations of PAHs were reduced by more than 96% for all tested ACs in a week despite the increased Cu sorption on AC. This indicates that enhanced metal sorption by surface oxidation of AC is less significant in controlling bioavailability of PAHs in sediments than particle size or sorbent dose.
机译：我们研究了重金属和多环芳烃（PAHs）对表面氧化的活性炭（AC）的吸附及其对沉积物中这些化合物分布的影响。 AC上产生的表面氧基团增强了铜在海洋沉积物中的吸附，这在吸附竞争方面表现出众。对于镉，根据顺序萃取与孔隙水浓度测量相结合的结果，通过添加交流电（例如pH）改变了水性化学成分对生物利用度的影响更大。氧化的AC表现出的生物利用度降低的铜吸附量高2.3倍，而23％的生物利用度镉被吸附在未修饰的AC上。用表面氧化的AC未观察到PAHs的BET表面积，孔体积和AC /水分布系数（K_（AC））有显着变化。氧化后K_（AC）的最大差异仅为0.14 log单位。因此，尽管铜在AC上的吸附量增加，但所有测试的AC在一周内将PAHs的自由溶解水溶液浓度降低了96％以上。这表明在控制沉积物中PAHs的生物利用度方面，通过AC的表面氧化增强的金属吸附作用不如粒度或吸附剂剂量重要。

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