Preparation method and application prospect of nano-flaky magnesium hydroxide

Nano-flaky magnesium hydroxide (Mg(OH)₂) has shown wide application potential in many fields due to its unique physical and chemical properties. This article will discuss several common methods for preparing nano-flaky magnesium hydroxide and how these methods affect its application in flame retardants, catalyst carriers and adsorbents.

Chemical liquid phase precipitation method

Experimental conditions: Mg²⁺ concentration 0.2 mol/L, reaction temperature 60°C, time 1.5 hours, and ammonia water dosage greater than 10 mL.

Surfactant: The addition amount of polyethylene glycol (PEG) is 0.3-4.0%, which can adjust the morphology of magnesium hydroxide.

Hydrothermal synthesis method

Experimental conditions: reaction temperature 100°C to 200°C, time from several hours to tens of hours, and a mixture of magnesium salt and alkaline substances is used as a precursor.

Microwave-assisted synthesis method

Experimental conditions: reaction time from a few minutes to tens of minutes, microwave power from hundreds of watts to several kilowatts.

Co-precipitation method

Experimental conditions: reaction temperature from room temperature to boiling, time from several hours to several days, pH value adjustment to control morphology and size.

Sol-gel method

Experimental conditions: magnesium salt and alkaline substances are used as precursors, water or organic solvents are used as solvents, and acids or bases are used as catalysts.

Electrochemical deposition method

Experimental conditions: current density, electrolysis temperature and time are adjusted according to experimental requirements.

Precautions

pH control: Accurate control of pH is crucial to product morphology and crystallinity.

Post-treatment: washing, centrifugal separation, drying and other steps are crucial to obtain the final product.

Characterization methods: SEM, TEM, XRD, etc. are used to characterize the morphology, size and crystallinity of magnesium hydroxide.

Application prospects

Nano-flaky magnesium hydroxide has important application value in flame retardant materials, catalyst carriers and environmental governance due to its high specific surface area and unique physical and chemical properties.

Through different preparation methods, the morphology and size of nano-flaky magnesium hydroxide can be regulated to optimize its performance in specific applications. With the continuous advancement of technology, the application field of nano-flaky magnesium hydroxide will be further broadened.