Piperazine functionalized mesoporous silica for selective and sensitive detection of ascorbic acid

• Published in: Journal of porous materials 2016-02, Vol.23 (1), p.123-129
• Main Authors: Sachdev, Divya, Maheshwari, Priyanka H., Dubey, Amit
• Format: Article
• Language: English
• Subjects: Acids; Ascorbic acid; Catalysis; Characterization and Evaluation of Materials; Chemical sensors; Chemistry; Chemistry and Materials Science; Citric acid; Diffraction; Fourier transforms; Juices; Microscopy; Nanocomposites; Nanostructure; Physical Chemistry; Porous materials; Scanning electron microscopy; Silica; Silicon dioxide; Sorption; Transmission electron microscopy; Vitamin C; Voltammetry; X ray powder diffraction; X-ray diffraction
• ISSN: 1380-2224; 1573-4854
• DOI: 10.1007/s10934-015-0061-3

Ordered mesoporous silica SBA-15 functionalized with piperazine (SBA/Pip) was synthesized via grafting method. Incorporation of piperazine inside the mesopores without affecting the stability of the ordered mesoporous silica could be viewed from different characterization techniques such as Powder X-ray diffraction, N 2 sorption studies, Fourier-Transform Infrared spectroscopy, Scanning Electron microscopy, Transmission Electron Microscopy. The SBA/Pip nanocomposite was employed as an electrochemical sensor to detect the presence of ascorbic acid ranging from millimolar to nanomolar range via differential pulse voltammetry (DPV) in the potential window of −1.5 to +1.5 V wherein the scan rate was maintained at 4 mV/s. Further SBA/Pip displayed selective detection of ascorbic acid in packed and fresh orange juice without any interference from other acids like citric acid commonly present in packed juice.