<sup>125</sup>I<sup>-</sup>在高庙子膨润土上的吸附行为

齐立也; 杨小雨; 王春丽; 周万强; 刘春立

doi:10.7538/hhx.2017.YX.2017016

¹²⁵I^-在高庙子膨润土上的吸附行为

1.
北京分子科学国家实验室,放射化学与辐射化学重点学科实验室,北京大学化学与分子工程学院,北京100871
2.
环境保护部核与辐射安全中心,北京100082

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- 刊出日期: 2018-04-19

Sorption Behavior of ¹²⁵I^- on Gaomiaozi Bentonite

1.
Beijing National Laboratory for Molecular Sciences, Fundamental Science Laboratory on Radiochemistry & Radiation Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
2.
Nuclear and Radiation Safety Center, Ministry of Environmental Protection of the People’s Republic of China, Beijing 100082, China

摘要

摘要: 通过批式吸附实验研究了溶液pH值、离子强度、温度、固液比等因素对¹²⁵I^-在高庙子膨润土上吸附行为的影响。结果表明，¹²⁵I^-在高庙子膨润土上的吸附受溶液pH值和离子强度影响显著，在中性和碱性条件下，¹²⁵I^-的吸附很弱，随着pH的降低吸附迅速增强并在pH=2.0出现最大值，之后随着pH继续降低，吸附迅速减小。在T=298 K、pH=2.0、0.10 mol/L NaClO₄背景电解质浓度下，¹²⁵I^-在高庙子膨润土上的最大吸附分配系数约为92 mL/g。采用自动电位滴定技术测得高庙子膨润土的pH_PZC≈9.5，蒙脱石的pH_PZC≈10.5。温度对¹²⁵I^-在膨润土上的吸附无显著影响，Freundlich等温吸附模型更适合描述不同温度下¹²⁵I^-在高庙子膨润土上的吸附行为。
- 高庙子膨润土 /
- ¹²⁵I^- /
- 吸附
Abstract: The sorption behavior of ¹²⁵I^- on Gaomiaozi bentonite was studied as a function of pH, ionic strength, temperature and solid-to-liquid ratio with the method of batch sorption experiments. ¹²⁵I^- sorption on Gaomiaozi bentonite is shown to be sensitive to pH and ionic strength. The sorption of ¹²⁵I^- is negligibly small under neutral and alkaline conditions, while with the decrease of pH, the sorption increases rapidly until the maximum sorption appeares at pH=2.0, and with the pH decreases, the sorption rapidly decreases. It is found that the maximum equilibrium sorption constant of ¹²⁵I^- on bentonite appeares under the condition of pH=2.0 at the background electrolyte concentration of 0.10 mol/L NaClO₄, which is approximately 92 mL/g at T=298 K. The pH PZC of bentonite is about 9.5 and the pH PZC of montmorillonite is about 10.5 from the results of acid-base titration. Temperature has little effect on the sorption of iodine on Gaomiaozi bentonite and Freundlich isotherm model is more suitable to describe sorption of iodine on Gaomiaozi bentonite at different temperatures.
- Gaomiaozi bentonite /
- ¹²⁵I^- /
- sorption

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125I-在高庙子膨润土上的吸附行为

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Sorption Behavior of 125I- on Gaomiaozi Bentonite

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¹²⁵I^-在高庙子膨润土上的吸附行为

Sorption Behavior of ¹²⁵I^- on Gaomiaozi Bentonite