Synthesis of a red iron oxide/montmorillonite pigment in a CO2-rich brine solution
Synthesis of a red iron oxide/montmorillonite pigment in a CO2-rich brine solution
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DOI：
10.1016/j.jcis.2006.07.064
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发表时间：
2006-11-15
影响因子：
9.9
通讯作者：
Villieras, F.
中科院分区：
文献类型：
--
作者：
Montes-Hernandez, G.;Pironon, J.;Villieras, F.
利用同离子钙蒙脱土在富含co2的盐水溶液（0.5 M NaCl）中，通过搅拌间歇式反应器（工程釜）合成了一种红色氧化铁/粘土颜料。操作条件为反应时间15天，压力200巴，温度150℃。采用SEM/EDS、STEM/EDS、XRD和红外光谱对反应前后固相进行表征。结果表明：在粘土基体中析出球形纳米颗粒（50 ~ 500 nm）的氧化铁（Fe2O3）分散或凝固；显然，这种氧化物在最终产品中产生了红色。在这种情况下，Fe3+阳离子是通过ca -蒙脱土的溶解提供给水溶液的，特别是溶解了初始粘土材料中含有的大多数细颗粒。观察了阳离子交换过程和多晶二氧化硅的沉淀过程。(c) 2006爱思唯尔公司版权所有。
The homoionic calcium-montmorillonite was used to synthesize a red iron oxide/clay pigment in a CO2-rich brine solution (0.5 M of NaCl) by using an agitated batch-reactor (engineer autoclave). The operating conditions were 15 days of reaction, 200 bars of pressure and 150 degrees C of temperature. SEM/EDS, STEM/EDS, XRD and Infrared Spectrometry were performed to characterize before and after reaction the solid phase. The results showed the precipitation of spherical nanoparticles (50-500 nm) of iron oxide (Fe2O3) dispersed and/or coagulated in the clay-matrix. Evidently, this oxide produced red coloration in the final product. For this case, the Fe3+ cation was provided to the aqueous solution by the dissolution of Ca-montmorillonite, particularly, the dissolution of most fine particles contained in the starting clay material. The cation exchange process and precipitation of polymorph silica were also observed. (c) 2006 Elsevier Inc. All rights reserved.