The coagulation principle of polyaluminum chloride 02
Adsorption and neutralization
Adsorption charge neutralization refers to the strong adsorption of the particle surface to the opposite-sign ions, the opposite-numbered colloidal particles or the part of the chain-like off-molecule with the opposite-sign charge, because this adsorption neutralizes part of its charge and reduces static electricity. Repulsive force, so it is easy to get close to other particles and adsorb each other.
At this time, electrostatic gravity is often the main aspect of these effects, but in many cases, other effects exceed electrostatic gravity.
For example, using Na+ and dodecylammonium ion (C12H25NH3+) to remove the turbidity caused by the negatively charged silver iodide solution, it is found that the same monovalent organic amine ion has a much greater destabilization ability than Na+, and Na+ is over-dosed. Addition will not cause the colloidal particles to be stable again, while organic amine ions do not. When exceeding a certain amount, the colloidal particles can be stabilized, which means that the rubber particles have absorbed too much counter ions, and the original negative charge will be transformed into a charged one. positive charge.
When the dosage of aluminum salt and iron salt is high, the stabilization phenomenon and the charge change will also occur. The above phenomenon is very suitable to be explained by the mechanism of adsorption and neutralization.
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