One-pot polycondensation and characterization of melamine-based polymer for mercury and sodium hypochlorite sensing

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-01-05 DOI:10.3233/mgc-230071

Mamta Devi, Navjot Sandhu, Renu Devi, Meenakshi Verma, Meena Nemiwal, Rahul Shrivastava, N. K. Gupta, Ripsa Rani Nayak, Rajesh K. Yadav, A. P. Singh

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Abstract

A porous, low-cost, organic, amorphous and carbon-nitride functionalized polymer was synthesized using melamine and 5-bromo-2-thiophenecarboxaldehyde. One-pot polycondensation method was opted, to yield hyper-crosslinked polyaminal network which was used for the detection of NaOCl and Hg2+. Reaction proceeds in single step without addition of any catalyst and gives promising yield. The authenticity of the synthesized polymer MB was established using X-Ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FT-IR) and Energy-dispersive spectroscopy (EDS). However, the morphology and thermal stability of MB was studied using X-Ray diffraction (XRD) & Scanning electron microscopy (SEM) and Thermogravimetric analysis (TGA) & Differential thermal analysis (DTA) respectively. BET studies were carried out to analyze the porous structure of MB. The pore diameter is centred at 6.2851 nm with specific surface area of 24.348 m2 g–1 and pore volume of 0.038258 cm3 g–1. The TGA curve showed that it has a good thermal stability (250°C). The synthesized compound was checked for its sensing behaviour with different analytes (metal ions: Cu2+, Cr2+, Mg2+, Cd2+, Mn2+, Zn2+, Pb2+, Hg2+; acids: HCl, H2SO4, HNO3 and ROS: t-BuOOH, KO2, NaOCl) in deionized water and was found to show significant change in intensity with NaOCl and Hg2+. The change in absorption spectra was observed at varied concentrations of NaOCl and Hg2+ solutions in deionized water using UV-Vis. Spectrophotometer.

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用于汞和次氯酸钠传感的三聚氰胺基聚合物的一锅缩聚和特性分析

使用三聚氰胺和 5-溴-2-噻吩甲醛合成了一种多孔、低成本、有机、无定形和氮化碳功能化聚合物。采用单锅缩聚法生成超交联聚酰胺网络，用于检测 NaOCl 和 Hg2+。反应在不添加任何催化剂的情况下一步完成，产量可观。利用 X 射线光电子能谱（XPS）、傅立叶变换红外光谱（FT-IR）和能量色散光谱（EDS）确定了合成聚合物 MB 的真实性。此外，还分别使用 X 射线衍射（XRD）和扫描电子显微镜（SEM）以及热重分析（TGA）和差热分析（DTA）研究了甲基溴的形态和热稳定性。BET 研究用于分析甲基溴的多孔结构。孔隙直径以 6.2851 nm 为中心，比表面积为 24.348 m2 g-1，孔隙体积为 0.038258 cm3 g-1。TGA 曲线显示，它具有良好的热稳定性（250°C）。在去离子水中与不同的分析物（金属离子：Cu2+、Cr2+、Mg2+、Cd2+、Mn2+、Zn2+、Pb2+、Hg2+；酸：HCl、H2SO4、HNO3 和 ROS：t-BuOOH、KO2、NaOCl）检测其传感行为，发现 NaOCl 和 Hg2+ 的强度有显著变化。使用紫外可见分光光度计观察了去离子水中不同浓度的 NaOCl 和 Hg2+ 溶液吸收光谱的变化。分光光度计。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.