Chemical magnesium hydroxide (Mg(OH)₂) is a white amorphous powder or colorless hexagonal crystal with high specific surface area, excellent adsorption performance and stable chemical properties. These characteristics make chemical magnesium hydroxide show unique advantages in wastewater treatment. Its high specific surface area provides a large number of adsorption sites, which can effectively capture heavy metal ions, organic matter and various suspended particles in wastewater.
The mechanism of chemical magnesium hydroxide adsorbing heavy metal ions mainly includes replacement and adsorption. On the one hand, the solubility product of chemical magnesium hydroxide is larger than that of general metals, which enables it to effectively replace heavy metal ions in wastewater and form precipitation. On the other hand, the hydroxyl groups on the surface of chemical magnesium hydroxide can form complexes with heavy metal ions to enhance the adsorption effect. This dual action mechanism makes chemical magnesium hydroxide show good results in treating wastewater containing heavy metals such as nickel, chromium and lead.
In addition to its excellent adsorption performance for heavy metal ions, chemical magnesium hydroxide can also effectively adsorb organic matter in wastewater. This is mainly due to its multi-level pore structure, which provides a large number of physical adsorption sites for various ions and molecules in the water. In addition, the alkaline nature of chemical magnesium hydroxide also helps it to neutralize the acidic organic matter in the wastewater, thereby further improving the adsorption efficiency.
Chemical magnesium hydroxide also has excellent buffering properties, which can effectively neutralize the acidic components in the wastewater and help maintain the pH value of the wastewater within an appropriate range. This feature is of great significance for preventing wastewater from causing further damage to the environment. At the same time, a stable pH value is also conducive to the best adsorption performance of chemical magnesium hydroxide.
In practical applications, chemical magnesium hydroxide has been widely used to treat various industrial wastewaters. For example, it can be used as a heavy metal ion adsorbent, an organic adsorbent, and a pH regulator. By making it into a filter bed of a certain thickness and filling it in the exchange column, the liquid to be treated can be adsorbed and purified by flowing through it. In addition, chemical magnesium hydroxide can also react with certain components in the wastewater to generate valuable by-products such as magnesium ammonium phosphate fertilizer, thereby realizing the reuse of resources.
The adsorption performance of chemical magnesium hydroxide is affected by many factors, including ion concentration, pH value, temperature, and particle size and morphology of chemical magnesium hydroxide in wastewater. For example, when the concentration of heavy metal ions in wastewater is too high, simple adsorption may not be able to completely remove them, and other treatment methods need to be combined to improve the treatment effect. At the same time, the smaller the particle size of chemical magnesium hydroxide and the larger the specific surface area, the better its adsorption performance is generally.
With the increasingly stringent environmental regulations and the continuous improvement of public environmental awareness, the market demand and application prospects of chemical magnesium hydroxide, an environmentally friendly water treatment agent, will become more and more broad. In the future, researchers will continue to explore more application potentials of chemical magnesium hydroxide, such as developing more efficient preparation methods, optimizing its adsorption performance, and expanding its application in other fields. At the same time, with the continuous advancement of science and technology and the gradual reduction of costs, the application of chemical magnesium hydroxide in the field of wastewater treatment will be more extensive and in-depth.
Chemical magnesium hydroxide shows excellent adsorption performance and broad application prospects in wastewater treatment. By in-depth research on its adsorption mechanism and influencing factors, we can better use this environmentally friendly material to protect water resources and improve the water environment.
