Due to the facile identification feature of the test paper, we design the tannic acid test paper to differentiate iron ions. Herein, we selected the 1. The optimal preparation condition of the tannic acid test paper is considered to immerse the filter paper in 1. The result suggests that the test paper can identify the concentration of Fe III solution more than 5.
The tannic acid test paper designed can detect the concentrations of more than 5. A facile and convenient method was offered to identify the iron ion by the tannic acid test paper. The strategy can be applied to identify other metal ions through color changes of the coordination reaction in several fields including medicine, food industry, environment, biology, metallurgy, and other industries.
The studies of iron-mediated self-assembly and the structure of iron-tannic complexes are currently in progress in our laboratories. The data used to support the findings of this study are available from the corresponding author upon request. Figure 1S: using the tannic acid test paper to identify 1. Figure 2S: using the tannic acid test paper to identify 1.
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Received 24 Aug Revised 28 Oct Accepted 03 Jan Published 03 Feb Abstract UV-Vis absorption spectra of tannic acid were gained at pH 1. Introduction In recent years, tannic acid, a natural plant product, has been widely applied in medicine [ 1 — 3 ], food [ 4 ], tanning [ 5 ], cosmetic [ 6 ], metallurgical, and other industries [ 7 , 8 ].
Experimental The experimental was carried out as described by Sungur and Uzar [ 16 ] and Li et al. Table 1. The amount of citric acid and sodium citrate at different pH values. Scheme 1. Chemical structure of tannic acid, a decagalloyl residue consisting of a center glucose molecule esterified at all five hydroxyl moieties with two gallic acids.
The circle indicates pentagalloylglucose and the core structure of tannic acid. Figure 1. UV-Vis absorption spectra of 1. Figure 2. Figure 3. Figure 4. The mole ratio curves of the tannic acid-Fe III complex by the mole ratio method. The solid line denotes 2.
The dotted line denotes 1. Figure 5. The mole ratio curves of the tannic acid-Fe II complex by the mole ratio method. The solid line denotes 1. The dotted line denotes 5. Figure 6. References K. Chung, T. Wong, C. Wei, Y. Huang, and Y. Bart, A. Halkes, A. Van den Berg, M. Hoekstra, J. Pont, and R.
View at: Google Scholar S. Lau, J. Wahn, G. Schulz, C. Sommerfeld, and U. McAllister, Y. Wang, and T. Colak, B. Yapici, and A. View at: Google Scholar İ. Huyut, M. Winkelmann, E. Badisch, S. Ilo, and S. Mutabaruka, K. Hairiah, and G. Slawinska, J. Slawinski, K. Polewski, and W. Mollenhauer and D. Chang, S. Lin, S. Wu, and C. Chu, H. Wang, Y.
Jiang et al. Nie, Y. Liang, B. Guo, K. Ni, D. Wei and Y. Ren, RSC Adv. To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page. If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given. If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given.
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