摘要
为了评估老化对聚酰胺(PA)微塑料吸附重金属的影响,本研究通过SEM和XPS对老化前后的PA进行表征分析,并开展紫外老化前后PA吸附Pb(Ⅱ)的动力学实验以及环境因子对PA吸附Pb(Ⅱ)的影响研究。实验结果表明:紫外老化增加了PA的表面粗糙度、孔洞和含氧官能团的数量;吸附过程更符合准二级动力学模型;2.5<pH<6时,PA的吸附能力与pH呈正相关关系,即随着PA表面的去质子化作用增大,PA对Pb(Ⅱ)的吸附能力增强;盐度会抑制PA对Pb(Ⅱ)的吸附能力,盐度越高,抑制作用越明显,而老化作用缓解了盐度对PA吸附Pb(Ⅱ)的抑制作用。
In order to evaluate the effect of aging on the adsorption of heavy metals on polyamide microplastics(PA),this study characterized and analyzed PA before and after aging by SEM and XPS,and carried out kinetic experiments on the adsorption of Pb(Ⅱ)by PA before and after photoaging and the effect of environmental factors on the adsorption of Pb(Ⅱ)by PA.The experimental results show that photoaging increases the surface roughness,pores and oxygen-containing functional groups of PA;pseudosecond-order kinetics describes the adsorption process better;the adsorption capacity of PA is positively correlated with pH at 2.5<pH<6,the adsorption capacity of PA on Pb(Ⅱ)is enhanced with the increase of deprotonation on the surface of PA;the salinity would inhibit the adsorption capacity of PA on Pb(Ⅱ),and the higher the salinity,the more obvious the inhibition is.Salinity inhibits the adsorption of Pb(Ⅱ)by PA,and the higher the salinity,the more obvious the inhibition,and the aging effect alleviates the inhibition of salinity on the adsorption of Pb(Ⅱ)by PA.
作者
杜婉婷
崔炜恒
崔亚婷
丁庆伟
刘宏芳
DU Wanting;CUI Weiheng;CUI Yating;DING Qingwei;Liu Hongfang(College of Environment and Resources,Taiyuan University of Science and Technology,Taiyuan 030024,China;Shanxi Ecological Functional Materials and Pollution Remediation Technology Engineering Research Center,Taiyuan 030024,China)
出处
《中北大学学报(自然科学版)》
2025年第6期793-799,共7页
Journal of North University of China(Natural Science Edition)
基金
国家自然科学基金资助项目(U21A20524)。
