Effect of pH on the selectivity and coagulation of humic acids in the presence of Al3+ by zeta potential
Abstract
In this research, the effect of pH (5 and 7) on the coagulation of humic acids (HAs) in presence of a coagulating agent such as aluminum (Al3 +) was evaluated.
Physicochemical analysis of studied HAs (commercial HA-CH and extracted in the laboratory HA-A and HA-T) showed polyacid and stable characteristics, which is corroborated with its ability to coagulate with the trivalent metal through zeta potential values. It was shown that there is a rapid interaction of HAs-Al in less than 5 min and especially when increasing the concentration of the metal (1, 2 and 3 mM) at a pH of 5, due to the deprotonation of carboxylic groups (-COOH) principally, that can coordinate under these conditions, reducing the net negative charge and enabling such complexes to approach one another and interact through hydrogen bonding.
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