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

0122863基尔达夫本研究的目的是对两种吸附-解吸滞后现象有一个基本的了解。其中包括热力学不可逆吸附，其中吸附和解吸遵循不同的微观路径，以及由于非生物表面催化的吸附物的化学转化而导致的滞后，其中产物仍然不可逆转地结合到固体上。这项研究将集中在有机化合物在自然环境中的热力学吸附原理：大分子有机碳(腐殖质)和微石墨质OC(黑碳)。吸附实验将在表征良好的模型吸附剂上进行，其行为可以比整个天然地质吸附剂更好地与机理相关。吸附和解吸数据将被用来计算不可逆性指数，以量化不可逆吸附滞后。非反应性测试化合物将是三氯甲烷、三氯乙烯、苯和萘，反应性测试化合物将是苯酚、邻苯二酚和邻苯三酚。对滞后现象的理解对于模拟化学物质的去向、确定土壤或沉积物质量标准、开发修复技术以及为修复后可接受的污染水平设定标准至关重要。这是康涅狄格州农业实验站(BES-0122761)和伦斯勒理工学院(BES-0122863)之间的合作研究资助。***

0122863 Kilduff 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). ***