Dissolution Characteristics and Morphology of Large-sized Scorodite Particles Synthesized from Fe(II) and As(V) in Aqueous Solution
Dissolution Characteristics and Morphology of Large-sized Scorodite Particles Synthesized from Fe(II) and As(V) in Aqueous Solution
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DOI：
10.1515/htmp-2012-0080
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发表时间：
2012-10
期刊：
影响因子：
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通讯作者：
S. Fujieda;K. Shinoda;T. Inanaga;M. Abumiya;Shigeru Suzuki
中科院分区：
文献类型：
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作者：
S. Fujieda;K. Shinoda;T. Inanaga;M. Abumiya;Shigeru Suzuki
摘要DOWA金属和矿业公司开发了一种从水溶液中的Fe（II）和As（V）制备直径约为20 µm的臭葱石颗粒的新工艺。本文研究了不同条件下合成臭葱石中铁和砷的溶出特性。结果表明，砷在水溶液中的溶出量很低，但溶出量与溶液的温度和pH值有复杂的依赖关系。利用透射电子显微镜（TEM）和能量色散X射线光谱仪（EDS）对臭葱石颗粒的形貌、结构和组成进行了分析。结果表明，臭葱石颗粒呈近八面体结构，其晶面几乎由（111）晶面组成。颗粒表面的铁浓度高于颗粒内部的铁浓度。这种特征形态，沿着臭葱石颗粒的最小表面缺陷，被认为是水溶液中砷从颗粒中的低溶解的原因。大气温度和溶液条件也被发现是重要的安全，长期储存砷使用臭葱石颗粒。
Abstract A novel process for preparing scorodite particles with a diameter of approximately 20 µm from Fe(II) and As(V) in aqueous solution has been developed by DOWA Metals and Mining. In the present study, the dissolution characteristics of iron and arsenic from the scorodite particles synthesized by this process have been investigated under different conditions. The results show that the concentration of arsenic dissolved from the particles in aqueous solution is very low, but it has a complicated dependence on the temperature and pH of the solution. Transmission electron microscopy (TEM) with an energy dispersive X-ray spectrometer (EDS) was used to analyze the morphology, structure, and composition of the scorodite particles. The results indicate that the scorodite particles exhibit a nearly octahedral shape with planes composed of almost (111) planes in the orthorhombic structure. The concentration of iron at the surface of the particles is higher than that of iron inside of the particles. This characteristic morphology, along with the minimal surface defects of the scorodite particles, is considered to be responsible for the low dissolution of arsenic from the particles in aqueous solution. Atmospheric temperature and solution conditions were also found to be important for the safe, long-term storage of arsenic using scorodite particles.