Application of talc powder in water treatment

Application of talc powder in water treatment

With the development of society and economy, various kinds of pollution problems caused by environmental pollution are becoming more and more serious. Heavy metal wastewater pollution is especially urgent. Using talc adsorption method to treat heavy metal wastewater pollution has become another major application of talc in environmental field. Today, we will briefly introduce the application of talc in water pollution.

The crystalline structure of talc

Talc structure layer silica and direction of the hydroxyl (hydrogen and oxygen electronegativity difference is less than 1.7) for the polar covalent bonds, at a relatively weak van der Waals force connection between layers, no other cationic, make it easy to split into thin layers during grinding. Talc composition is given priority to with Mg, in the class of Fe ion mass with elephant, the octahedral take part of the positively charged, at the same time, can also occur in the silicon oxygen tetrahedron instead of Si Al ions phenomenon, and lead to tetrahedron take some negatively charged, offset the positive and negative charges, so the talc unit within the layer charge balance. Layer inside OH - Mg - O and OH - Mg - OH magnesium atoms and oxygen atoms in the electronegativity difference was 2.3, close to each other in some conditions, ionic bonds are formed by electrostatic attraction, combined with the relatively strong, and talc with unique pore structure and larger specific surface area, therefore, its chemical properties of stability and strong adsorption ability.

A dynamic adsorption experiment was used to study the adsorption experiment of Cu ion, Pb ion and Cd ion of talc powder in water. The results show that the talc on the three kinds of heavy metal ions adsorption isotherm to accord with the Langmuir and Freundlich equation, at the same time in the initial concentration of three kinds of heavy metal ions, the adsorption capacity for Pb ions from big to small order, Cd, Cu ions; Under optimal conditions, Pb ion removal rate is 99.95%, Cu ion removal rate is about 98%, and Cd ion removal rate is 99.9%.

Although talcum powder has good adsorption effect, but still has a certain distance away from the industrial application, talc in the actual recovery rate is low, in the process of wastewater treatment by adsorption of heavy metals are difficult to recycle, etc. Therefore, the research on the recovery and reuse of talc powder should be strengthened to provide a theoretical basis for further developing the application of talc powder in water treatment. With the deepening research on the purification of water pollution by talc powder and the continuous development of the processing and modification technology of talc, it is expected that talc powder will have a significant breakthrough in water treatment.

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