在SDS辅助下,利用氯化镁和碳酸钠溶液在较低温度下(＜55℃)反应结晶直接合成碱式碳酸镁微球.利用XRD、FTIR,SEM等技术研究了SDS加入量,反应温度,反应物浓度以及NaCl浓度等合成条件对产物的影响.结果表明:在反应温度低于55℃时,控制反应物浓度小于0.20 mol· L-1,加入一定量的SDS,可以有效抑制无定形颗粒向MgCO3·3H2O生长,促使无定形纳米颗粒通过相转移与自组装直接向碱式碳酸镁4MgCO3·Mg(OH)2·4H2O转变.SDS加入量,反应温度,反应物浓度以及NaCl浓度对碱式碳酸镁微球尺寸和微观形貌均起到调节作用.%Hydromagnesite microspheres were synthesized by a sodium dodecyl sulfate-assisted process under lower temperature (<55 ℃). The process was conducted via reactive crystallization of magnesium chloride with sodium carbonate solution. The effects of synthesis conditions, such as SDS amount, the reactive temperature, reactant concentration and NaCl concentration, were experimentally investigated by means of XRD, FTIR, SEM and other methods. The results showed that when the reactive temperature <55 ℃ and the reactant concentration <0.20 mol · L-1, the presence of SDS can effectively inhibit the amorphous nanoparticles grow into MgCO3 · 3H2O, and promote the transformation to hydromagnesite by the assembling crystallization of amorphous nanoparticles. Therefore, SDS amount, reactive temperature, reactant concentration and NaCl concentration play a regulatory role on the microspheres' size and morphology of as-synthesized hydromagnesite.
展开▼
