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Importance of activated carbon's oxygen surface functional groups on elemental mercury adsorption

机译：活性炭的氧表面官能团对元素汞吸附的重要性

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The effect of varying physical and chemical properties of activated carbons on adsorption of elemental mercury (Hg~0 was studied by treating two activated carbons to modify their surface functional groups and pore structures. Heat treatment (1200 K) in nitrogen (N_2), air oxidation (693 K), and nitric acid (6N HNO_3) treatment of two activated carbons (BPL, WPL) were conducted to vary their surface oxygen functional groups. Adsorption experiments of Hg~0 by the activated carbons were conducted using a fixed-bed reactor at a temperature of 398 K and under N_2 atmosphere. The pore structures of the samples were characterized by N_2 and carbon dioxide (CO_2) adsorption. Temperature-programmed desorption (TPD) and base-acid titration experiments were conducted to determine the chemical characteristics of the carbon samples. Characterization of the physical and chemical properties of activated carbons in relation to their Hg~0 adsorption capacity provides important mechanistic information on Hg~0 adsorption. Results suggest that oxygen surface complexes, possibly lactone and carbonyl groups, are the active sites for Hg~0 capture. The carbons that have a lower carbon monoxide (CO)/CO_2 ratio and a low phenol group concentration tend to have a higher Hg~0 adsorption capacity, suggesting that phenol groups may inhibit Hg~0 adsorption. The high Hg~0 adsorption capacity of a carbon sample is also found to be associated with a low ratio of the phenol/carbonyl groups. A possible Hg~0 adsorption mechanism, which is likely to involve an electron transfer process during Hg~0 adsorption in which the carbon surfaces may act as an electrode for Hg~0 oxidation, is also discussed.
机译：通过处理两种活性炭以修饰其表面官能团和孔结构，研究了活性炭的不同理化性质对元素汞（Hg〜0）吸附的影响。在氮气（N_2），空气中进行热处理（1200 K）对两种活性炭（BPL，WPL）进行氧化（693 K）和硝酸（6N HNO_3）处理以改变其表面氧官能团，并在固定床上进行了活性炭对Hg〜0的吸附实验。在398 K温度和N_2气氛下反应器中，通过N_2和二氧化碳（CO_2）吸附来表征样品的孔结构，并进行了程序升温脱附（TPD）和碱酸滴定实验以确定化学特性。表征活性炭的物理和化学性质与其吸附Hg〜0的能力有关，提供了重要的机理信息。 n Hg〜0吸附。结果表明，氧表面复合物，可能是内酯和羰基，是捕获Hg〜0的活性位点。一氧化碳（CO）/ CO_2比值较低且酚基浓度较低的碳往往具有较高的Hg〜0吸附容量，这表明酚基可能会抑制Hg〜0吸附。还发现碳样品的高Hg〜0吸附能力与低比例的苯酚/羰基有关。还讨论了可能的Hg-0吸附机理，该机理可能涉及Hg-0吸附过程中的电子转移过程，其中碳表面可以充当Hg-0氧化的电极。

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