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首页> 外文期刊>RSC Advances >Poly(vinyl alcohol) electrospun nanofibrous membrane modified with spirolactam-rhodamine derivatives for visible detection and removal of metal ions
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Poly(vinyl alcohol) electrospun nanofibrous membrane modified with spirolactam-rhodamine derivatives for visible detection and removal of metal ions

机译：螺内酰胺-若丹明衍生物修饰的聚乙烯醇电纺纳米纤维膜，用于可见离子的检测和去除

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摘要

Poly(vinyl alcohol) electrospun nanofibrous (PVANF) membranes that could sensitively detect and adsorb metal ions were modified with spirolactam-rhodamineine derivatives (PVANF-SRD) membranes and sulfo-spirolactam-rhodamine derivatives (PVANF-SSRD) membranes. Surface chemistry and morphology during functionalization of PVANF membranes were monitored using Fourier transform-infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). These two membranes could display real-time sensing by the naked eye based on ring-opening reaction of spirolactam-rhodamine derivatives induced by corresponding metals. PVANF-SRD and PVANF-SSRD membranes exhibited high selectivity and sensitivity toward Fe3+/Cr3+ and Hg2+, respectively. In terms of PVANF-SSRD membranes, adsorption capacity for Hg2+ in contaminated water was studied. Freundlich isotherm could better describe the interactions than Langmuir: K-f = 7.0175 mg g (-1) (r(2) = 0.9996) for Hg2+. The regenerability of these two membranes was investigated via Na(4)EDTA solution treatment, and results demonstrated good sustainability in detection and adsorption efficiency.
机译：螺内酰胺-若丹明胺衍生物（PVANF-SRD）膜和磺基-螺内酰胺-若丹明衍生物（PVANF-SSRD）膜修饰了可以灵敏地检测和吸附金属离子的聚乙烯醇电纺纳米纤维（PVANF）膜。使用傅里叶变换红外光谱（FT-IR），X射线光电子能谱（XPS）和扫描电子显微镜（SEM）来监测PVANF膜功能化过程中的表面化学和形态。基于相应金属诱导的螺内酰胺-若丹明衍生物的开环反应，这两个膜可以通过肉眼实时显示。 PVANF-SRD和PVANF-SSRD膜分别对Fe3 + / Cr3 +和Hg2 +表现出高选择性和敏感性。根据PVANF-SSRD膜，研究了Hg2 +在污水中的吸附能力。与Langmuir相比，Freundlich等温线可以更好地描述相互作用：Hg2 +的K-f = 7.0175 mg g（-1）（r（2）= 0.9996）。通过Na（4）EDTA溶液处理研究了这两种膜的可再生性，结果证明了在检测和吸附效率方面的良好可持续性。

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