ADSORPTION AND SURFACE PRECIPITATION OF METALS ON AMORPHOUS IRON OXYHYDROXIDE
ADSORPTION AND SURFACE PRECIPITATION OF METALS ON AMORPHOUS IRON OXYHYDROXIDE
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DOI：
10.1021/es00117a012
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发表时间：
1983-01-01
影响因子：
11.4
通讯作者：
BENJAMIN, MM
中科院分区：
文献类型：
--
作者：
BENJAMIN, MM
研究了Cd、Cu、Co和Zn对Cr 〇 4和Se 〇 4在Fe 2 〇 3·H2 〇（am）上吸附的影响。阴离子的吸附不受阳离子存在的影响，除非阳离子形成表面沉淀，推测为M（OH）2（s）。通常，当形成这种沉淀时，阴离子的吸附就会增加。如果不形成表面沉淀，金属和阴离子之间对表面位置的竞争以及阳离子对阴离子吸附的静电效应都可以忽略不计，即使在金属的表观吸附密度非常高的情况下（1 mol M/mol Fe）。金属的吸附在某些系统中增加了它们沉淀的倾向，而在另一些系统中则减少了它。结果表明，该技术可能是有用的，在检测表面沉淀物的形成。
The effects of Cd, Cu, Co, and Zn on sorption of Cr04 and Se04 onto Fe203* H20 (am) have been investigated. Sorption of theanions is unaffected by the presence of the cations unless the cations form a surface precipitate, presumably M (OH) 2 (s). Generally when such a precipitate forms, sorption of the anion increases. If a surface pre-cipitate does not form, competition between the metal and the anion for surface sites and electrostatic effects of the cations on anion adsorption are both negligible, even at very high apparent adsorption densities of the metals (1 mol of M/mol of Fe). Adsorption of metals increases their tendency to precipitate in some systems and decreases it in others. The results suggest a technique which may be useful in detecting the formation of surface precipitates.