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Precipitation Method Synthesis and Characterization of Basic Magnesium Carbonate and Magnesium Hydroxide

Author: HaoZhiHua
Tutor: DuFangLin
School: Qingdao University of Science and Technology
Course: Materials Physics and Chemistry
Keywords: Precipitation method Fungus -like Surface of the leaf-shaped rod-like structure Flower globular Magnesium carbonate Magnesium hydroxide
CLC: O614.22
Type: Master's thesis
Year: 2009
Downloads: 115
Quote: 2
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Abstract


In recent years, controllable morphologies of magnesium carbonate and magnesium hydroxide as an important inorganic materials in pharmaceuticals, cosmetics, rubber, widely used, has aroused widespread interest. In this paper, a simple precipitation controllable prepared with special morphology of magnesium carbonate and magnesium hydroxide, reaction conditions on the morphology and crystal structure by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and thermal analysis (TG-DTA) were characterized. Explore the mechanism of their formation. The main content and the results are as follows: 1. The precipitate prepared coryneform basic magnesium carbonate in the case of without any template and the surfactant, using Mg (NO 3 ) 2 · 6H 2 O and K 2 CO 3 as a raw material for the synthesis of the surface of the rod-like structure of the leaf-like. By changing the temperature, the morphology of the product by the smooth surface of the rod-like structure to the surface of the rod-like structure of the leaf-shaped, and its corresponding component by MgCO 3 · 3H 2 O into a Mg 5 (CO 3 ) 4 (OH) 2 · 4H 2 O. Ultrasound - prepared by precipitation fungus-like basic magnesium carbonate Mg (NO 3 ) 2 · 6H 2 O and Na 2 CO 3 as a starting material, under ultrasonication were synthesized by adjusting the temperature of the micro-structure of the various shapes of magnesium carbonate. At 70 ° C, the product of a fungus-like structure, this fungus-like structure by the thickness of 10-20 nm nanosheets self-assembled;, the shape of the product is similar to the shape of 70 ° C at 60 ° C, but from 10-20 nm, the thickness of the sheet into a few nanometers; product at 40 ° C, and the product becomes a radius of 0.5μm, and the rod-like structure having a length of 10μm; With morphology by the fungus-like structure into a rod-like structure, and the product ingredients by MgCO 3 · 3H 2 O into a Mg 5 (CO 3 ) 4 (OH) 2 · 4H 2 O. 3. Template prepared rod-like basic magnesium carbonate use of Na 2 CO 3 Mg (NO 3 ) 2 · 6H 2 O as a starting material prepared by a radius of 0.5-1μm, and a length of 10-20μm coryneform magnesium carbonate. The use of a rod-like magnesium carbonate as a template without adding any chemical reagent, but was prepared by raising the temperature of the radius of 2μm, and the length of the rod-like structure of the surface of the 10-20μm for the leaf-shaped. The XRD structure that final product Mg 5 (CO 3 ) 4 (OH) 2 · 4H 2 O. 4 magnesium hydroxide precipitate prepared to spend spherical MgCl 2 · 6H 2 O and NH 3 · H 2 O as reactants flower spherical Mg (OH) 2 was prepared at atmospheric pressure with a simple precipitation method. SEM showed that the radius of the ball by a 50 nm thick nanosheets piled flowers 3μm, and the morphology of uniform. The morphology of the final product and the reaction temperature and NH 3 · H 2 O the amount of coffee used. (A) when the reaction temperature is 70 ° C, the final product is of radius 1μm thin sheet-like structure; temperature was 50 ° C, the final product was a rose-like structure; when the temperature is 40 ° C, and finally product for flower globular structure. (B) When NH 3 · H 2 O in an amount of 10 ml of 1-2μm, the final product as a flaky structure; When NH 3 < / sub> · H 2 O in an amount of 10 ml, the final product is a sheet aggregation body; When the NH 3 · H the 2 O in an amount of 5 ml, the final product is a flower spherical structure.

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > Section II group metal element and its compounds > Magnesium Mg
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