Abstract
Mg(OH)2 whiskers were successfully prepared under mechanical stirring with D301 ion exchange resin and Mg(NO3)2. The products were systematically characterized by testing settling ratio, turbidity, and analyzing SEM, FT-IR. The results showed that Mg(OH)2 prepared with 0.05 or 0.1 mol/L Mg(NO3)2 had excellent dispersion, and the settling ratio was close to 100 % after 360 min; The time extension was extremely helpful to improve the dispersion; The dispersion of product was correspondingly good under pH value of about 9. The products synthesized with different concentrations and reaction time could reach nanoscale, and the product obtained using 0.05 mol/L Mg(NO3)2 for 4 h had whisker structure with a length of 10 im and had a lipophilicity. FT-IR analysis showed the product included some functional groups or fragments from the resin, which had a positive modification effect on the products. The preparation of Mg(OH)2 whisker with resin as raw material is simple, green, and environmentally friendly, which is worthy of further application.
Highlights
Mg(OH)2 has been widely used in chemical industry, environmental protection, medical treatment, and nano material synthesis due to its unique physical, chemical, and mechanical properties [1-6]
Effect of different concentrations of Mg(NO3)2 solution on the dispersion of Mg(OH)2 Settling ratio is often used to evaluate the stability of inorganic powder in dispersion system
When the concentration of Mg(NO3)2 is 0.05 or 0.1 mol/L, the settling ratio curve is almost a straight line with the extension of time, which is very close to 100 %, and it is very clear that the dispersion of the product is very excellent
Summary
Mg(OH) has been widely used in chemical industry, environmental protection, medical treatment, and nano material synthesis due to its unique physical, chemical, and mechanical properties [1-6]. Have prepared Mg(OH) with sheet structure by liquid phase precipitation method using sodium dodecyl sulfate and ethanol as dispering agents, magnesium chloride hexahydrate and sodium hydroxide as raw materials; Zhu Huabing et al [15] used brine as raw material, and firstly prepared high activity coarse magnesium oxide by direct dynamic pyrolysis, and prepared flake and strip Mg(OH) by hydration process. The former used ethanol and deionized water to filter and wash the crude product for many times, so as to obtain Mg(OH) with high purity; while the latter pumped and filtered the emulsion containing magnesium quickly, and adopted distilled water at the corresponding temperature to wash the filter cake for three times, and used anhydrous ethanol to wash the filter cake repeatedly, in order to stop the reaction and take away the magnesium nitrate on the solid surface, and dried the filter cake to achieve pure Mg(OH) product. It can be seen that these methods usually need a lot of water or organic solvents to wash the product repeatedly in order to improve the purity, which can produce the large amount of wastewater and raise the production cost
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