SURFACE-AREAS AND POROSITIES OF FE(III)-DERIVED AND FE(II)-DERIVED OXYHYDROXIDES
SURFACE-AREAS AND POROSITIES OF FE(III)-DERIVED AND FE(II)-DERIVED OXYHYDROXIDES
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DOI：
10.1021/es00118a004
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发表时间：
1983-01-01
影响因子：
11.4
通讯作者：
MILLWARD, GE
中科院分区：
文献类型：
--
作者：
CROSBY, SA;GLASSON, DR;MILLWARD, GE
本文报道了在与天然沃茨相似的条件下，由三价铁和二价铁生成的羟基氧化铁沉淀的比表面积和孔隙特征。由Fe（Ⅲ）衍生的磷灰石的比表面积在159-234 m2·g ~（-1）范围内，具有窄颈宽体型孔的磁滞回线。X射线衍射、红外光谱和穆斯堡尔谱等鉴定实验表明，沉淀物在初始阶段是无定形的，但在时效12天后，它们含有10-20%的-FeOOH。由Fe（Ⅱ）衍生的铁酸盐的比表面积在97-120 m ~ 2·g ~（-1）范围内，它们被鉴定为结晶不良的7-FeOOH。来自富铁源的天然样品显示出6.4-164 m2 g_1的表面积，具有多孔和非多孔特征。本研究的结果是相关的溶解痕量组分的吸附铁羟基氧化物在天然沃茨。
This paper reports the surface areas and pore charac-teristics of iron oxyhydroxide precipitates derived from ferric and ferrous iron by using conditions verysimilar to those encountered in natural waters. Precipitates derived from Fe (III) hadsurface areas in therange 159-234 m2 g" 1 with hysteresis loops which suggested pores of the nar-row-necked, wide-bodied type. The identification exper-iments involving X-ray diffraction, infrared spectroscopy, and Mossbauer spectroscopy showed that the precipitates were amorphous in the initial phases but on aging for 12 days they contained 10-20%-FeOOH. Precipitates de-rived from Fe (II) had surface areas in the range 97-120 m2 g-1, and they were identified as poorly crystalline 7-FeOOH. The natural samples from iron-rich sources showed surface areas in therange 6.4-164 m2 g_1 with both porous and nonporous characteristics. The results of this study are of relevance to the adsorption of dissolved trace constituents by iron oxyhydroxides in natural waters.