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Open AccessArticle

Implementation of Modified Acacia Tannin by Mannich Reaction for Removal of Heavy Metals (Cu, Cr and Hg)

Chemistry Department, Science Faculty, Pontificia Universidad Javeriana, 110231 Bogotá, Colombia
Author to whom correspondence should be addressed.
Water 2020, 12(2), 352;
Received: 13 December 2019 / Revised: 12 January 2020 / Accepted: 20 January 2020 / Published: 28 January 2020
(This article belongs to the Special Issue Removal of Heavy Metals from Wastewater)
The modified tannin by Mannich reaction was investigated for wastewater treatment. The removal of heavy metals, such as copper, chromium and mercury, in industrial wastewater was evaluated through the coagulation–flocculation technique, using modified Acacia tannin (MAT) as a coagulant agent. The successful tannin modification was evaluated by infrared spectopometry (FTIR), nuclear magnetic resonance (NMR); monitoring the removal of heavy metals was performed by atomic absorption (AA) and a direct mercury analyzer (DMA). Additionally, the parameters of water quality, total suspended solids (TSS), turbidity and chemical oxygen demand (COD) were assessed. Different doses of MAT were evaluated (375 ppm, 750 ppm, 1250 ppm and 1625 ppm) and three different levels of pH (4, 7 and 10). The highest percentages of removal obtained were copper 60%, chromium 87%, mercury 50%–80%, COD 88%, TSS 86% and turbidity 94%, which were achieved with the dose of 375 ppm of MAT at pH 10. The coagulation–flocculation process with the modified Acacia tannin is efficient for the removal of conventional parameters and for a significant removal of the metals studied. View Full-Text
Keywords: coagulation–flocculation; heavy metals; tannin; wastewater treatment coagulation–flocculation; heavy metals; tannin; wastewater treatment
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MDPI and ACS Style

Lugo, L.; Martín, A.; Diaz, J.; Pérez-Flórez, A.; Celis, C. Implementation of Modified Acacia Tannin by Mannich Reaction for Removal of Heavy Metals (Cu, Cr and Hg). Water 2020, 12, 352.

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