The surface functionality leading to a high reversibility adsorption of melamine was determined. Four different silane coupling agents, namely, 3-(tri-methoxysilyl) propyl methacrylate (TMSPMA), n-propyl tri-methoxy-silane (PTMS), 3-(tri-ethoxysilyl) propionitrile (TESPN), and tri-methoxy-(octadecyl) silane (OTMS) were taken for making chemical functionality methacrylate, short methyl, nitrile, and extended methyl group respectively. The adsorption behavior of melamine over the substrates with four functionalities was determined using quartz crystal microbalance (QCM). The adsorption kinetics and adsorption isotherms of the adsorption studies were analyzed. The initial adsorption rate depends on the hydrophobicity and roughness of the surfaces. However, the subsequent adsorption rate depends on the specific interaction. The data of equilibrium adsorbed mass at various equilibrium concentrations were fitted with the modified Brunauer–Emmett–Teller (BET) and Freundlich adsorption isotherms. The estimated model parameters were analyzed and compared with the reported parameters of the relevant systems. There is good agreement between our results and the reported results. In addition, very high adsorption with a very high binding constant was observed for the adsorption of melamine OTMS surface. On the other hand, high adsorption with an intermediate layer binding constant for the adsorption of melamine on the methacrylate surface was observed. Based on this, we propose using acrylate chemical functionality to develop molecularly imprinted polymer-based melamine sensors.

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三聚氰胺特征吸附的表面化学功能

确定了导致三聚氰胺高可逆吸附的表面官能度。四种不同的硅烷偶联剂，即甲基丙烯酸3-(三甲氧基甲硅烷基)丙酯(TMSPMA)、正丙基三甲氧基硅烷(PTMS)、3-(三乙氧基甲硅烷基)丙腈(TESPN)和三甲氧基硅烷偶联剂。 (十八烷基)硅烷(OTMS)分别用于制备化学官能团甲基丙烯酸酯、短甲基、腈和长甲基。使用石英晶体微天平（QCM）测定了三聚氰胺在具有四种功能的基材上的吸附行为。分析了吸附研究的吸附动力学和吸附等温线。初始吸附速率取决于表面的疏水性和粗糙度。然而，随后的吸附速率取决于特定的相互作用。不同平衡浓度下的平衡吸附质量数据符合修正的 Brunauer-Emmett-Teller (BET) 和 Freundlich 吸附等温线。对估计的模型参数进行了分析，并与相关系统的报告参数进行了比较。我们的结果和报告的结果之间有很好的一致性。此外，对于三聚氰胺 OTMS 表面的吸附，观察到具有非常高的结合常数的非常高的吸附。另一方面，在甲基丙烯酸酯表面上观察到三聚氰胺的吸附具有中间层结合常数的高吸附。基于此，我们建议使用丙烯酸酯化学功能来开发基于分子印迹聚合物的三聚氰胺传感器。