Controlled deposition of calcium carbonate particles on porous membranes by using alternating current system.
Controlled deposition of calcium carbonate particles on porous membranes by using alternating current system.
复制标题
使用交流电系统控制碳酸钙颗粒在多孔膜上的沉积。
DOI：
10.1016/j.jcis.2008.07.049
复制
发表时间：
2008
影响因子：
9.9
通讯作者：
M. Akashi
中科院分区：
文献类型：
--
作者：
J. Watanabe;M. Akashi
在不存在添加剂的情况下，通过施加交流电进行碳酸钙颗粒的沉积。将氯化钙和碳酸钠的溶液填充在玻璃池中，并将多孔聚合物膜插入玻璃池之间。通过使用铂电极施加具有正弦波形（频率：10Hz）的交流电流。在此过程中，发生钙离子和碳酸根离子朝向膜上的孔的界面的相互迁移。此外，在孔的界面处发生小程度的离子混合。施加交流电30分钟，在此期间继续离子混合。当使用扫描电子显微镜观察时，发现大部分形成的碳酸钙颗粒表现出球状球文石晶体结构。经X射线衍射分析，该晶体结构为球文石。在没有交流电的情况下，在多孔聚合物膜上仅形成方解石。考虑到这一结果，得出的结论是，交流电可以诱导通过膜的孔的相互离子迁移，和球文石沉积可以实现。这是通过使用交流系统在多孔膜上形成碳酸钙所采用的方法之一。
The deposition of calcium carbonate particles in the absence of additives was performed through the application of an alternating current. Solutions of calcium chloride and sodium carbonate were filled in glass cells, and a porous polymer membrane was interposed between the glass cells. An alternating current with a sine waveform (frequency: 10 Hz) was applied by using a platinum electrode. In this process, the reciprocal migration of calcium and carbonate ions toward the interface of the pores on the membrane takes place. Moreover, ion mixing occurs to a small extent at the interface of the pores. An alternating current was applied for 30 min during which the ion mixing continued. When observed using a scanning electron microscope, a majority of the formed calcium carbonate particles was found to exhibit a spheroidal vaterite crystal structure. This crystal structure was confirmed to be vaterite after characterization by X-ray diffraction. In the absence of an alternating current, only calcite was formed on the porous polymer membrane. Taking this result into account, it was concluded that the alternating current could induce reciprocal ion migration through the pores of the membrane, and vaterite deposition can be achieved. This is one of the methods employed for the calcium carbonate formation on the porous membrane by using an alternating current system.