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首页> 外文期刊>Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine >Sorption and desorption of radiocobalt on montmorillonite - Effects of pH, ionic strength and fulvic acid
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Sorption and desorption of radiocobalt on montmorillonite - Effects of pH, ionic strength and fulvic acid

机译：蒙脱石对放射性钴的吸附和解吸-pH，离子强度和黄腐酸的影响

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摘要

Humic substances and clay minerals have been studied extensively in radioactive waste management. In our research, the sorption and desorption of radiocobalt on montmorillonite in the presence and absence of fulvic acid as a function of pH and ionic strength were investigated under ambient conditions by using batch techniques. The results indicate that the sorption of cobalt is strongly dependent on pH values and independent of ionic strength. Surface complexation rather than cation exchange is considered as the main mechanism of cobalt sorption to montmorillonite. The presence of fulvic acid enhances cobalt sorption obviously at pH values < 8. The desorption behavior changes of surface-sorbed cobalt from montmorillonite were studied by decreasing pH values and the solution cobalt concentrations independently. The results indicated that the sorption of cobalt on montmorillonite is irreversible. (c) 2007 Elsevier Ltd. All rights reserved.
机译：腐殖质和黏土矿物已在放射性废物管理中进行了广泛的研究。在我们的研究中，使用批处理技术研究了在存在和不存在黄腐酸的情况下，蒙脱石上放射性钴的吸附和解吸与pH和离子强度的关系。结果表明，钴的吸附强烈依赖于pH值，而与离子强度无关。表面络合而不是阳离子交换被认为是钴吸附到蒙脱土的主要机理。黄腐酸的存在在pH值<8时明显增强了钴的吸附。通过降低pH值和溶液中钴的浓度，研究了蒙脱石表面吸附的钴的解吸行为变化。结果表明，钴在蒙脱石上的吸附是不可逆的。 （c）2007 Elsevier Ltd.保留所有权利。

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