College of Water Sciences, Beijing Normal University, Beijing 100875, China; Engineering Research Center of Groundwater Pollution Control and Remediation, Ministry of Education, Beijing 100875, China.
College of Water Sciences, Beijing Normal University, Beijing 100875, China; Engineering Research Center of Groundwater Pollution Control and Remediation, Ministry of Education, Beijing 100875, China.
J Contam Hydrol. 2020 Aug;233:103659. doi: 10.1016/j.jconhyd.2020.103659. Epub 2020 May 23.
The sorption behaviour of Sr into granite was studied with the presence or absence of typical colloids (goethite, bentonite and humic acid). A batch technique was used to analyse the influencing process of colloids and key factors. Moreover, scanning electron microscopy and Fourier transform infrared spectroscopy were used to characterize granite samples before and after the batch experiments. The experiments showed that the presence of colloids promotes the sorption of Sr in the broken granite system; when goethite, bentonite or humic acid (HA) was present, the sorption capacity percentages were 1.8, 2.13 and 1.93 times higher, respectively, than those in the granite only system. As the initial Sr concentration increased, the sorption of Sr increased, but the sorption percentage decreased; the sorption percentage reached a maximum at pH = 7 and decreased as the acidity or alkalinity of the solution increased. The sorption of granite may be related to the interstitial water of the hydroxyl, quartz, and feldspar, the intergranular water of granite groups and the water molecules attached to the granite. Moreover, the surface of the granite sample was rougher after the sorption experiment.
研究了在存在或不存在典型胶体（针铁矿、膨润土和腐殖酸）的情况下，锶在花岗岩中的吸附行为。采用批量技术分析胶体和关键因素的影响过程。此外，还使用扫描电子显微镜和傅里叶变换红外光谱对批实验前后的花岗岩样品进行了表征。实验表明，胶体的存在促进了 Sr 在破碎花岗岩体系中的吸附；当存在针铁矿、膨润土或腐殖酸（HA）时，Sr 的吸附容量百分比分别比仅在花岗岩体系中的高 1.8、2.13 和 1.93 倍。随着初始 Sr 浓度的增加，Sr 的吸附增加，但吸附百分比降低；当溶液的酸度或碱度增加时，吸附百分比在 pH = 7 时达到最大值，然后降低。花岗岩的吸附可能与羟基、石英和长石的间隙水、花岗岩基团的粒间水以及附着在花岗岩上的水分子有关。此外，吸附实验后，花岗岩样品的表面变得更粗糙。
