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2023
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09
Water softening function of molecular sieve
Molecular sieve is an alkali metal aluminosilicate, which can adsorb water
Molecular sieve is an alkali metal aluminosilicate, which can adsorb water, NH3, H2S, sulfur dioxide, carbon dioxide, C2H5OH, C2H6, C2H4 and other molecules with a critical diameter of no larger than that. It is widely used in the drying of gases and liquids, and can also be used for the refining and purification of certain gases or liquids, and the selective adsorption performance of water is higher than that of any other molecule.
Today I will introduce you to the softening water quality function of molecular sieve.
Each oxygen atom in the zeolite skeleton is shared by two adjacent tetrahedra, and this structure forms large cavities that can be occupied by cations and water molecules, and these cations and water molecules have greater mobility for cation exchange and reversible dehydration. The ion exchange of molecular sieves is carried out on a skeleton with aluminum ions, each of which carries a negative charge, which can bind not only sodium ions, but also other cations. Calcium and magnesium ions can enter the large crystal cavities occupied by the original sodium ions, and replace the sodium ions in the molecular sieve - that is, the sodium ions in the molecular sieve can be exchanged with Ca2+, Mg2+ ions in hard water, so as to achieve the purpose of softening water quality.
The molecular sieve binds to calcium and magnesium ions more slowly than sodium tripolyphosphate, and its binding ability to magnesium ions is weak. However, molecular sieve can easily and quickly remove a small number of harmful heavy metal ions in the aqueous solution, such as Pb2+, Cd2+, and Hg2+, which is of great significance for purifying water quality.
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2023-09-19
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