红叶石楠叶面角质层组分对Cs的吸附作用

发布时间：2018-05-03 20:39

本文选题：叶面角质层 + 铯　；参考：《中国环境科学》2017年08期

【摘要】：为准确预测放射性核素在植物叶面的吸附行为,用化学方法(脱蜡,皂化,酸解)分离得到角质层(PHC1),脱蜡角质层(PHC2),脱蜡-脱角质角质层(PHC3),脱蜡-脱角质-脱糖角质层(PHC4)以及蜡质等红叶石楠叶面角质层组分,研究了角质层组分对Cs的吸附特征及影响因素.结果表明:红叶石楠叶片角质层由16.63%蜡质,63.41%角质,12.86%多糖,7.10%角碳组成.PHC1、PHC2、PHC3、PHC4各组分对Cs的吸附30min即达到吸附平衡,饱和吸附量分别为1.73、1.92、4.67和0.58mg/g.角质层组分的饱和吸附量与其极性和芳香性指数具有显著的二元线性正相关性,其中极性指数对核素吸附具有更高权重的影响.糖类和角质是叶面角质层吸附核素的主要介质,各角质层组分吸附Cs贡献率分别为:糖类(51.45%)角质(38.73%)蜡质(7.51%)角碳(2.31%).竞争离子的存在能显著降低叶面对核素的吸附作用:随着Na离子浓度的增加,叶面角质层对Cs的吸附性能逐渐下降,当Na和Cs摩尔浓度比为100:1时,红叶石楠叶面角质层的吸附量仅为对照的6%.
[Abstract]:In order to accurately predict the adsorption behavior of radionuclides on plant leaves, chemical methods (dewaxing, saponification, PHC1, PHC2, PHC3, PHC4, PHC4 and PHC4 were isolated from keratinocytes, such as PHC1, PHC2, PHC3, PHC4 and PHC4, respectively. The adsorption characteristics and influencing factors of Cs by cuticle components were studied. The results showed that the adsorption equilibrium of Cs in the keratinocytes of Photinia mandshurica leaves from 16.63% (63.41%) keratinocytes (12.86%) and 7.10% (7.10%) was achieved, and the saturated adsorption amounts were 1.731.924.67 and 0.58 mg / g / g, respectively. There is a significant binary linear positive correlation between the saturated adsorption amount of keratinocytes and their polarity and aromaticity index, in which the polarity index has a higher weight on the adsorption of nuclides. Carbohydrates and horniness are the main mediums for the adsorption of nuclides in the keratinocytes of the leaf surface. The contribution rates of Cs adsorbed by each component of the cuticle are: sugar 51.45) and horniness 38.73) the wax is 7.51%) and the absorption rate of Cs is 2.31%. The presence of competitive ions can significantly reduce the adsorption of nuclides on the leaves. With the increase of Na ion concentration, the adsorption of Cs to Cs in the keratinocytes of leaves decreases gradually, when the molar ratio of Na to Cs is 100: 1, The adsorption capacity of the horniness layer on the leaf surface of Photinia rubrum was only 6% of that of the control.
【作者单位】：西南科技大学环境与资源学院环境工程系;四川省低成本废水处理技术国际科技合作基地;
【基金】：国家自然科学基金项目(21307100) 四川省科技计划国际合作项目(2017HH0042) 四川省大学生创新创业训练计划资助项目(201610619034)
【分类号】：X173;X591

【相似文献】