研究了纳米材料多壁碳纳米管(MWCNTs)对黄土表面含氟矿物的溶氟现象,并对其溶氟机理进行讨论。土柱实验结果表明:掺杂少量MWCNTs能将黄土中含氟矿物持续溶出;土柱实验后土样的透射电镜(TEM)测试表明,MWCNTs存在于黄土颗粒之间的孔隙内,且土柱实验后纳米管直径明显增大。通过MWCNTs柱实验、吸附实验以及模型拟合结果表明,MWCNTs对黄土表面的溶氟作用过程主要经历离子交换吸附、化学吸附、脱附溶解过程,从而不断促使黄土中大量氟离子进入水体中。因此,当MWCNTs被当作新材料大量使用时,应注意其对水土环境造成的危害,这一研究成果将为保护环境提供科学依据。
The effect of multi-walled carbon nanotubes (MWCNTs),a new nano material,on the dissolution of fluorine(F) in loess was studied,and discussed the mechanism.The results of soil column experiment showed that small amount of MWCNTs could continuously dissolve large number of F-bearing minerals from loess particles with water flow in the soil column experiment doped with MWCNTs.TEM tests of the soil samples after soil column experiment showed that MWCNTs existed widely in the pore between loess particles,and the diameter of nanotubes after soil column experiment was larger than that of the original MWCNTs.The column experiment,adsorption experiment and model fitting results shown that the F dissolution process of MWCNTs on loess surface mainly gone through chemical adsorption,desorption and dissolution,which continuously promoted large number of F ions in loess into water body.Therefore,when MWCNTs were widely used as new materials,attention should be paid to their harm to the water and soil environment.This result will provide scientific basis for the protection of environment.
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基金资助
陕西省自然科学基金项目(2021SF-443);长安大学大学生创新创业项目(202010710138和202110710083)
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