This study presents a new, revolutionary, and easy method for evaluating the separation process through a membrane that is based on changing the color of the membrane surface during the separation process. For this purpose, a cellulose acetate membrane surface was modified in several steps: initially with amino propyl triethoxysilane, followed by glutaraldehyde reaction and calmagite immobilization. Calmagite was chosen for its dual role as a molecule that will complex and retain Gd(III) and also as an indicator for Gd(III). At the contact with the membrane surface, calmagite will actively complex and retain Gd(III), and it will change the color of the membrane surface during the complexation process, showing that the separation occurred. The synthesized materials were characterized by Fourier transform infrared spectroscopy (FT-IR), thermal analysis (TGA-DTA), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy, demonstrating the synthesis of membrane material with self-indicating properties. In addition, in the separation of the Gd(III) process, in which a solution of gadolinium nitrate was used as a source and as a moderator in nuclear reactors, the membrane changed its color from blue to pink. The membrane performances were tested by Induced Coupled Plasma–Mass Spectrometry (ICP-MS) analyses showing a separation process efficiency of 86% relative to the initial feed solution.

中文翻译：

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通过改变膜表面颜色来分离Gd（III）的具有自指示性能的醋酸纤维素膜的合成和表征

这项研究提出了一种新的，革命性的，简便的方法来评估通过膜的分离过程，该方法基于在分离过程中改变膜表面的颜色。为此目的，醋酸纤维素膜的表面经过以下几步修饰：首先用氨基丙基三乙氧基硅烷进行修饰，然后进行戊二醛反应和钙锰矿固定化。选择钙镁石是因为它具有双重作用，可以复合并保留Gd（III），也可以作为Gd（III）的指示剂。在与膜表面接触时，钙铁矿将主动络合并保留Gd（III），并且在络合过程中它将改变膜表面的颜色，表明发生了分离。通过傅立叶变换红外光谱（FT-IR）对合成的材料进行表征，热分析（TGA-DTA），X射线光电子能谱（XPS）和拉曼光谱，证明了具有自指示特性的膜材料的合成。此外，在Gd（III）工艺的分离中（其中硝酸nitrate溶液用作来源和核反应堆中的调节剂），膜的颜色从蓝色变为粉红色。膜性能通过诱导耦合等离子体质谱（ICP-MS）分析进行测试，相对于初始进料溶液，分离过程效率为86％。在核反应堆中使用硝酸g溶液作为来源和调节剂时，膜的颜色从蓝色变为粉红色。膜性能通过诱导耦合等离子体质谱（ICP-MS）分析进行测试，相对于初始进料溶液，分离过程效率为86％。在核反应堆中使用硝酸nitrate溶液作为来源和调节剂时，膜的颜色从蓝色变为粉红色。膜性能通过诱导耦合等离子体质谱（ICP-MS）分析进行了测试，相对于初始进料溶液，分离过程的效率为86％。