Collaborative Research: Sorption Reversibility of Hydrophobic Compounds in Geosorbents Investigated with Model Sorbents

0122761 Pignatello本研究的目的是获得两种吸附-解吸滞后的基本理解。 这些包括不可逆吸附，其中吸附和解吸遵循不同的微观途径，以及由于被吸附物的非生物表面催化的化学转化而产生的滞后，其中产物保持不可逆转地与固体结合。 这项研究将集中在自然环境中的有机化合物的热力学吸附剂的原则：大分子有机碳（腐殖物质）和微晶OC（黑碳）。 吸附实验将进行充分表征的模型吸附剂，其行为可以更好地相关的机制比整个天然地质吸附剂。吸附和解吸数据将用于计算不可逆指数，以量化不可逆吸附滞后。 非反应性供试化合物为三氯甲烷、三氯乙烯、苯和萘，反应性供试化合物为苯酚、邻苯二酚和邻苯三酚。 对滞后现象的理解对于模拟化学品的命运、确定土壤或沉积物质量标准、开发补救技术以及制定补救后可接受的污染水平标准至关重要。 这是康涅狄格州农业实验站（BES-0122761）和伦斯勒理工学院（BES-0122863）之间的合作研究基金。 ***

0122761 Pignatello The objective of this research is to obtain a fundamental understanding of two kinds of adsorption-desorption hysteresis. These include thermodynamically irreversible sorption, in which adsorption and desorption follow different microscopic pathways, and hysteresis due to abiotic surface-catalyzed chemical transformation of the adsorbate where the products remain irretrievably bound to the solid. This research will focus on the principle thermodynamic sorbents of organic compounds in natural settings: macromolecular organic carbon (humic substances) and micrographitic OC (black carbon). Sorption experiments will be performed on well-characterized model sorbents, whose behavior can be better related to mechanism than whole natural geosorbents. Adsorption and desorption data will be used to compute an irreversibility index to quantify irreversible sorption hysteresis. Non-reactive test compounds will be trichloromethane, trichloroethene, benzene, and naphthalene, and the reactive test compounds will be phenol, catechol, and pyrogallol. An understanding of hysteresis is crucial to modeling a chemical's fate, defining soil or sediment quality criteria, developing remediation technologies, and setting standards for acceptable levels of contamination after remediation. This is a collaborative research grant between Connecticut Agricultural Experiment Station (BES-0122761) and Rensselaer Polytechnic Institute (BES-0122863). ***