矿物吸附胶原蛋白性能差异及其环境意义  

The Performance Differences of Collogen Adsorption by Minerals and the Environmental Implications

作　　者：解欣悦 陈艳 周跃飞[1] 阚立波 杜蒙蒙 谢巧勤[1] 陈天虎[1] XIE Xinyue;CHEN Yan;ZHOU Yuefei;KAN Libo;DU Mengmeng;XIE Qiaoqin;CHEN Tianhu(Key Laboratory of Nanominerals and Pollution Control of Anhui Higher Education Institutes,School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China;China Jikan Research Institute of Engineering Investigations and Design Co.,Ltd.,Xi’an 710043,China)

机构地区：[1]合肥工业大学资源与环境工程学院,纳米矿物与污染控制安徽省重点实验室,合肥230009 [2]机械工业勘察设计研究院有限公司,西安710043

出　　处：《高校地质学报》2025年第2期255-262,共8页Geological Journal of China Universities

基　　金：国家自然科学基金(41872043)资助。

摘　　要：胶结壳有孔虫伪足及壳体有机质中富含胶原蛋白,其对矿物的选择性捕获和固定起着关键作用,但相关机制和环境效应还不明确。文章以常见碎屑矿物石英、钠长石、金红石为研究对象,通过吸附实验探讨三种矿物吸附胶原蛋白的效果、热力学、动力学、pH值的影响、吸附产物对重金属吸附的影响等。结果表明,钠长石和石英达到吸附平衡的时间约为25 h,金红石约为12 h;三种矿物的吸附过程均具有准二级动力学的特征。吸附热力学上,石英和钠长石更符合Freundlich方程;金红石更符合Langmuir方程;石英、钠长石和金红石的饱和吸附量分别为3.7、5.0和35.7 mg·g^(-1)。钠长石和金红石在pH=3时吸附量最大,pH对石英吸附胶原蛋白的影响不显著。大体上,吸附胶原蛋白的矿物对Zn和Cu的固定能力均有所增强,其中Zn增加更多。研究表明,有孔虫可以通过降低pH选择性捕获和固定钠长石和金红石;在利用有孔虫吸附的金属量追索海水重金属浓度时,需要考虑重金属的种类及有机质的影响。Collogens in the pseudopodia and organic matters in the shell of the agglutinated foraminifera play key roles in the capturing and preserving of special detrital minerals.However,the relative mechanism and environmental implications are still not well understood.In this study,adsorption experiments were conducted to investigate the efficiency,thermodynamics,kinetics,the effect of solution pH on the adsorption of collogen,and the effect of adsorbed collogen on the adsorption of heavy metals by minerals,were conducted.Results showed that the equilibrium time of collogen adsorption by quartz and albite is 25 h,while that by rutile is about 12 h.The adsorption can be described by the quasi-second-order dynamics equation for all the three minerals.As for adsorption thermodynamics,quartz and albite are more in line with the Freundlich equation,while rutile is in line with the Langmuir equation.The order of the maximum adsorption capacity for three minerals is rutile>albite>quartz.At pH=3.0,both albite and rutile obtain respective maximum collogen adsorption capacity;while for quartz, the adsorption capacity is unrelated to the solution pH. Generally, the immobilization abilities of Zn and Cu by three minerals are enhanced after the modification of mineral surface by the adsorbed collogen. The results indicated that the agglutinated foraminifera can achieve the targets of selectively capturing and locking minerals through decreasing pH, and the effect of organic matters should be considered when the foraminifera shells are introduced for tracing the heavy metal concentrations.

关 键 词：矿物 胶原蛋白 吸附 影响因素 环境效应 

分 类 号：P574[天文地球—矿物学]