Polyaluminum chloride (PAC) is a commonly used water treatment agent used to remove chromaticity and organic substances from water. The decolorization mechanism of PAC involves the following aspects:
1. Adsorption: The aluminum chloride ion (AlCl3) in PAC has high adsorption capacity and can adsorb organic substances and pigment molecules in water. These organic substances and pigments typically bind to the surface of PAC through electrostatic interactions and chemical adsorption, thereby reducing the chromaticity of water.
2. Association: Aluminum ions in PAC can form complexes or coordination compounds with certain organic substances in water. This association can change the structure and properties of organic substances, causing them to lose color or reduce chromaticity.
3. Flocculation: PAC can combine with suspended solids and colloidal particles in water to form a floc. These flocs are large and dense, capable of adsorbing and encapsulating pigment molecules and organic substances in water, thereby reducing the chromaticity of the water.
4. PH regulation effect: The addition of PAC can adjust the pH value of water to an appropriate range. For some organic pigments, adjusting the pH value can change their ionization state and molecular structure, thus affecting their color performance.
Overall, the decolorization mechanism of PAC is achieved through a combination of adsorption, association, flocculation, and pH regulation to reduce the chromaticity and organic matter content in water. The specific decolorization effect and mechanism will be influenced by factors such as water quality characteristics, PAC type and dosage, and treatment time. Therefore, when using PAC for decolorization treatment, appropriate dosage and operational control should be carried out according to the actual situation.
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