Exploring the Role of Surface Characteristics in Determining Sorption Properties of Chars and Soots

0332160拟议工作的总体目标是评估木炭和煤烟颗粒中自组织吸附的程度和性质；仔细描述吸附剂的显著物理和化学性质，并利用这些信息来测试关于内部表面结构、表面化学和自生(天然结合)多环芳烃[PAHs]在控制HOCs吸附方面的作用的具体假设。这项工作将包括对以下类型的煤烟和焦炭的研究：(1)在受控燃烧地点从燃烧的松木原木中获得的天然焦炭；(2)由同一木材来源在不同碳化最终温度下形成的合成焦炭；(3)NIST的柴油煤烟标准物质；(4)实验室产生的正己烷煤烟；以及(5)表面特征差异得到很好控制的经过化学修饰的选定焦炭和煤烟。大多数吸附研究将用两种山梨酸酯(1，2，4-三氯苯和2，4-二氯苯酚)进行。使用这些和其他山梨酸酯的实验将阐明山梨酸酯结构在吸附的特定方面的作用，包括p-p键以及与表面氧化物的偶极-偶极和氢键相互作用。

0332160 Ball Objectives of the proposed work are to evaluate the extent and nature of HOC sorption in wood char and soot particles; to carefully characterize salient physical and chemical properties of the sorbents and to use this information to test specific hypotheses regarding the role of internal surface structure, surface chemistry, and authigenic (natively bound) polycyclic aromatic hydrocarbons [PAHs] in controlling sorption for HOCs. The work will include studies with selected soots and chars of the following types: (1) natural chars obtained from burnt pine logs at sites of controlled burn; (2) synthetic chars formed from the same wood source at different final temperatures of carbonization; (3) diesel soot reference materials from NIST; (4) laboratory-generated hexane soot; and (5) chemically modified selected chars and soots with well-controlled differences in surface characteristics. Most sorption studies will be performed with two sorbates (1,2,4-trichlorobenzene and 2,4-dichlorophenol). Experiments with these and other sorbates will elucidate the role of sorbate structure on specific aspects of sorption, including p.p bonding as well as dipole-dipole and hydrogen-bonding interactions with surface oxides.