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首页> 外文期刊>Environmental Science & Technology >Effect of Pore-Blocking Background Compounds on the Kinetics of Trace Organic Contaminant Desorption from Activated Carbon
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Effect of Pore-Blocking Background Compounds on the Kinetics of Trace Organic Contaminant Desorption from Activated Carbon

机译：孔阻背景化合物对活性炭中微量有机污染物解吸动力学的影响

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摘要

This study examined the effect of pore-blocking (PB) background organic matter, which is known to hinder adsorption kinetics, on the rate of trace contaminant desorption. Adsorption, displaced desorption (DD) and nondisplaced desorption (NDD) kinetic tests were performed using powdered activated carbon (PAC) that was preloaded with natural organic matter (NOM). Since the NOM contained both strongly competing (SC) and PB components, the proposed model separated the contributions of the SC and PB NOM to the overall diffusion coefficient of the target contaminant By factoring out the SC NOM contribution, which increases the overall diffusion coefficient, it was found that the relationship used to model the effect of PB NOM on adsorption kinetics could also describe desorption kinetics. The results highlighted the substantial influence of competitive SC NOM on the kinetics of adsorption and desorption. SC NOM competition aids contaminant removal by offsetting the undesirable effects of pore blocking on adsorption kinetics. However, for desorption events, PB NOM serves a practical benefit of reducing the rate of release of adsorbed micropollutants, while SC NOM counters that gain by both displacing contaminants and accelerating their diffusion.
机译：这项研究检查了已知会阻碍吸附动力学的孔隙阻塞（PB）背景有机物对痕量污染物解吸速率的影响。使用预先装有天然有机物（NOM）的粉状活性炭（PAC）进行吸附，置换解吸（DD）和非置换解吸（NDD）动力学测试。由于NOM包含强竞争（SC）和PB成分，因此建议的模型通过考虑SC NOM的贡献来分离SC和PB NOM对目标污染物的总扩散系数的贡献，这会增加总扩散系数，发现用于模拟PB NOM对吸附动力学影响的关系也可以描述解吸动力学。结果强调了竞争性SC NOM对吸附和解吸动力学的重大影响。 SC NOM竞争产品通过抵消孔堵塞对吸附动力学的不良影响来帮助去除污染物。但是，对于解吸事件，PB NOM具有降低吸附的微污染物释放速率的实际好处，而SC NOM可通过置换污染物和加速其扩散来抵消这种增加。

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