Studies on the Coordination Reaction of VO2+ and Tannic Acid in the Tannin Extract Desulfurization

Abstract:

At different temperatures, the protonation constants of tannic acid and the complex apparent stability constants between tannic acid and VO2+ were determined by using pH potentimetric method. The results showed that the protonation constants and the complex apparent stability constants slightly decreased with the raising temperature. In accordance with the pH value in the tannin extract technology, the conditional stability constants of the complex were calculated on the basis of the acid effect of tannic acid and the hydrolysis effect of VO2+. It was found that pH greatly affected the stability constants of the complex , so pH must be strictly controlled in the tannin extract technology.

• Periodical: Applied Mechanics and Materials (Volumes 239-240)
• Pages: 1573-1576
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.239-240.1573
• Online since: December 2012
• Authors: Zhu Qing Gao, Xiao Dong Cai, Kai Cheng Ling
• Keywords: Coordination Reaction, pH-Potentiometry, Tannic Acid, VO²⁺

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