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

探索表面特性在确定炭和烟灰吸附特性中的作用

• 批准号: 0332160
• 负责人: William Ball
• 金额: $ 44.29万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-09-01 至 2006-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0332160&HistoricalAwards=false
• 关键词: Exploring; Role; Surface; Characteristics; Determining

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.

0332160 Ball 拟议工作的目标是评估木炭和烟灰颗粒中 HOC 吸附的程度和性质；仔细表征吸附剂的显着物理和化学性质，并使用这些信息来测试有关内表面结构、表面化学和自生（天然结合）多环芳烃 [PAH] 在控制 HOC 吸附中的作用的具体假设。这项工作将包括对以下类型的选定烟灰和炭进行研究：（1）从受控燃烧地点燃烧的松木原木中获得的天然炭； (2)由相同的木材来源在不同的碳化最终温度下形成的合成炭； (3) NIST 提供的柴油机烟尘参考资料； (4) 实验室产生的己烷烟灰； (5)经过化学改性的精选炭和烟灰，其表面特性差异得到良好控制。大多数吸附研究将使用两种山梨酸盐（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盐的实验将阐明山梨酸盐结构对吸附特定方面的作用，包括 p.p 键合以及偶极-偶极和与表面氧化物的氢键相互作用。