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首页> 外文期刊>The Science of the Total Environment >Probing molecular interaction mechanisms of organic fouling on polyamide membrane using a surface forces apparatus: Implication for wastewater treatment
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Probing molecular interaction mechanisms of organic fouling on polyamide membrane using a surface forces apparatus: Implication for wastewater treatment

机译：使用表面力装置探测聚酰胺膜上有机污垢的分子相互作用机理：对废水处理的意义

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Surface fouling is the dominant fouling mechanism of thin-film composite (TFC) membranes used in reverse osmosis (RO) technology. Understanding the complex interactions between foulant-membrane which drive the attachment and growth of foulants on membrane surface is of both fundamental and practical importance. This work aims to understand the molecular interaction mechanisms of organic fouling on RO-TFC membranes. A surface forces apparatus (SFA) was employed to directly measure the interaction forces and time-dependent adsorption behaviors between model organic foulants: humic acid (HA), bovine serum albumin (BSA), and lipopolysaccharides (LPS) and a polyamide (PA) thin film. PA thin film was prepared by interfacial condensation polymerization on mica substrates usingm-phenylenediamine and 1,3,5-benzenetricarbonyltrichloride. The interaction forces between PA films and different foulant (HA, BSA, LPS) were directly measured under controlled solution chemistries in an asymmetric configuration (foulant-deposited PA films vs. PA films). The adsorption behaviors of these foulants on PA films were directly monitored in a symmetric configuration (PA films vs. PA films). These interactions were examined as a function of both contact time and solution chemistry (ionic strength). In asymmetrical configuration, both HA and BSA show repulsion with PA surface during approach and adhesion during separation, but LPS demonstrates repulsion only. In symmetrical configuration, all the foulants show adsorption on PA surface and the initial adsorption rate of foulant to PA surface follows the order of BSA>LPS>HA. The interaction mechanisms between PA films and foulants were discussed based on the interaction forces and interaction dynamics measurement.
机译：表面结垢是用于反渗透（RO）技术的薄膜复合（TFC）膜的主要结垢机理。理解推动膜表面污垢附着和生长的污垢-膜之间复杂的相互作用，具有根本和实际的重要性。这项工作旨在了解RO-TFC膜上有机污垢的分子相互作用机理。使用表面力装置（SFA）直接测量模型有机污垢物：腐殖酸（HA），牛血清白蛋白（BSA），脂多糖（LPS）和聚酰胺（PA）之间的相互作用力和随时间变化的吸附行为薄膜。通过使用间苯二胺和1,3,5-苯三羰基三氯化物在云母基材上进行界面缩聚制备PA薄膜。 PA膜与不同污垢（HA，BSA，LPS）之间的相互作用力是在受控溶液化学状态下以非对称配置直接测量的（污垢沉积的PA膜与PA膜）。这些污垢在PA膜上的吸附行为以对称配置（PA膜vs. PA膜）直接监测。这些相互作用是接触时间和溶液化学性质（离子强度）的函数。在非对称配置中，HA和BSA都在进近过程中显示出与PA表面的排斥力，而在分离过程中出现了粘附，但LPS仅显示出排斥力。在对称构型下，所有污垢均显示在PA表面吸附，并且污垢对PA表面的初始吸附速率遵循BSA> LPS> HA的顺序。基于相互作用力和相互作用动力学的测量，探讨了PA膜与污垢之间的相互作用机理。

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