双注沉淀—水热处理法制备高分散氢氧化镁
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摘要
文章对制备高分散氢氧化镁进行了研究。结果表明:以去离子水为底料,氢氧化钠为沉淀剂的双注沉淀—水热处理工艺是制备高分散氢氧化镁的较理想方法。在水热处理过程中,加入氢氧化钠可显著改善氢氧化镁的结晶完整性、分散性和过滤性能。合成的较佳工艺条件是:反应温度为80℃,氯化镁浓度为3 mol/L,水热介质氢氧化钠浓度为4 mol/L。在上述条件下,产品主要为片状,分散性较好,平均粒径约为200 nm。
The preparation of magnesium hydroxide with high dispersity was studied in the experiment. It showed that the double injected precipitation—hydrothermal treatment was the ideal method. In this system,deionized water was used as the substrate,sodium hydroxide as the precipitator. The research also indicated that hydrothermal treatment in the presence of sodium hydroxide might effectively improved the morphology,crystallinity,dispersivity and filtration performance of products. The optimum reaction conditions for the atmospheric pressure synthesis were that the concentration of magnesium chloride was 3 mol / L and the temperature was 80 ℃. Well- dispersed regular hexagonal flakes of Mg( OH)2with a mean size of 200 nm were obtained by treating Mg( OH)2particles in the presence of 4 mol / L sodium hydroxide.
The preparation of magnesium hydroxide with high dispersity was studied in the experiment. It showed that the double injected precipitation—hydrothermal treatment was the ideal method. In this system,deionized water was used as the substrate,sodium hydroxide as the precipitator. The research also indicated that hydrothermal treatment in the presence of sodium hydroxide might effectively improved the morphology,crystallinity,dispersivity and filtration performance of products. The optimum reaction conditions for the atmospheric pressure synthesis were that the concentration of magnesium chloride was 3 mol / L and the temperature was 80 ℃. Well- dispersed regular hexagonal flakes of Mg( OH)2with a mean size of 200 nm were obtained by treating Mg( OH)2particles in the presence of 4 mol / L sodium hydroxide.
引文
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[6]A.Sierra-Fernandez,L.S.Gomez-Villalba,O.Milosevic,et.al.Synthesis and morpho-structural characterization of nanostructured magnesium hydroxide obtained by a Hydrothermal method[J].Ceramics International,2014,40:12285-12292.
[2]Xiaojun Guo,Juan Lu,Li Zhang.Magnesium hydroxide with higher adsorption capacity for effective removal of Co(Ⅲ)from aqueous solutions[J].Journal of the Taiwan Institute of Chemical Engineers,2013,44:630-636.
[3]苏明阳,赵晓洋,唐林生.纳米氢氧化镁制备方法的最新研究进展[J].盐业与化工,2014,43(1):1-6.
[4]Chen Dehong,Zhu Lunyu,Zhang Huaiping,et al.Magnesium hydroxide nanoparticles with controlled morphologies via wet coprecipitation[J].Materials chemistry and Physics,2008,109(2-3):221
[5]H.Yan,X.H.Zhang,J.M.Wu,et.al.The use of CTAB to improve the crystallinity and dispersibility of ultrafine magnesium hydroxide by hydrothermal route[J].Powder Technology,2008,188:128-132.
[6]A.Sierra-Fernandez,L.S.Gomez-Villalba,O.Milosevic,et.al.Synthesis and morpho-structural characterization of nanostructured magnesium hydroxide obtained by a Hydrothermal method[J].Ceramics International,2014,40:12285-12292.