Montes-Rojas Antonio, Ramírez-Orizaga Marlen, Ávila-Rodríguez Jesús Gerardo, Torres-Rodríguez Luz María
Laboratorio de Electroquímica, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Av. Dr. Manuel Nava, Zona Universitaria, San Luis Potosí CP. 78210, Mexico.
Membranes (Basel). 2020 Nov 30;10(12):387. doi: 10.3390/membranes10120387.
One of the intended applications for the modification of ion exchange membranes with polyaniline (PAni) is to use it as a matrix to include chemical species that confer a special property such as resistance to fouling or ion selectivity. In particular, the inclusion of polyelectrolyte molecules into the PAni matrix appears to be the way to modulate these properties of selective membranes. Therefore, it must be clearly understood how the polyelectrolyte is incorporated into the matrix of polyaniline. Among the results obtained in this paper using poly(sodium 4-styrenesulfonate) (PSS) and an electrochemical quartz crystal microbalance, the amount of polyelectrolyte incorporated into PAni is found to be proportional to the PSS concentration in solution if its value is between 0 and 20 mM, while it reaches a maximum value when the PSS in solution is greater than 20 mM. When the anion exchange membranes are modified with these composite deposits, the transport number of chloride was found to decrease progressively (when the PSS concentration in solution is between 0 and 20 mM) to reach a practically constant value when a concentration of PSS greater than 20 mM was used.
用聚苯胺（PAni）对离子交换膜进行改性的预期应用之一是将其用作基质，以包含赋予特殊性能（如抗污染性或离子选择性）的化学物质。特别是，将聚电解质分子纳入PAni基质似乎是调节选择性膜这些性能的方法。因此，必须清楚地了解聚电解质是如何掺入聚苯胺基质中的。在本文使用聚（4-苯乙烯磺酸钠）（PSS）和电化学石英晶体微天平获得的结果中，发现如果溶液中PSS浓度在0至20 mM之间，掺入PAni的聚电解质量与溶液中PSS浓度成正比，而当溶液中PSS大于20 mM时，其达到最大值。当用这些复合沉积物对阴离子交换膜进行改性时，发现氯离子的迁移数逐渐降低（当溶液中PSS浓度在0至20 mM之间时），当使用大于20 mM的PSS浓度时达到实际恒定值。
