摘要
为探究聚乙烯(PE)微塑料的不同形态对Fe^(3+)吸附性能的影响,分析两者之间的相互作用。选用低密度聚乙烯(LDPE)和线型低密度聚乙烯(LLDPE)作为不同形态PE的代表,利用SEM、FTIR、吸附比表面测试法及Zeta电位表征其结构形貌,并通过静态吸附实验探讨不同形态PE对Fe^(3+)的吸附效果影响。结果表明LDPE相较于LLDPE具有更优的颗粒分散性、比表面积和表面负电性,其对Fe^(3+)的最大吸附量达到5.01 mg·L^(-1),PE对Fe^(3+)的吸附量随着微塑料投加量的增加先增大后减小,升温有利于吸附反应的进行。LDPE和LLDPE对Fe^(3+)的吸附均符合准一级动力学和朗缪尔模型,这表明吸附过程以单层物理吸附为主;颗粒内扩散模型表明吸附过程以表面吸附为主,且内扩散不是吸附速率控制的唯一步骤。此外,扩散力和静电力是LDPE和LLDPE吸附Fe^(3+)的主要作用机制,并且不受其线型结构的影响。
To explore the influence of different forms of polyethylene(PE)microplastic on the adsorption performance of Fe^(3+),and the interaction between PE with Fe^(3+),low-density polyethylene(LDPE)and linear low-density polyethylene(LLDPE)were chosen to represent different forms of PE in this investigation.The structures and morphologies were characterized by SEM,FTIR,Brunauer-Emmett-Teller method and Zeta potential,and the impact of various forms of PE on the adsorption of Fe^(3+)was systematically examined through static adsorption experiments.The results indicated that LDPE was better than LLDPE in particle dispersion,specific surface area,and surface negativity,with a maximum adsorption capacity for Fe^(3+)of 5.01 mg·L^(-1).The adsorption capacity of PE for Fe^(3+)increased first and then decreased with the increase of microplastic dosage,the temperature rise was beneficial to the adsorption reaction.The adsorption of Fe^(3+)by LDPE and LLDPE was consistent with the pseudo-first-order kinetics and Langmuir model,indicating that single-layer physical adsorption was the dominant mechanism.The particle diffusion model revealed that the adsorption process was predominantly governed by surface adsorption,and internal diffusion was not the only controlling step of the adsorption rate.In addition,diffusion force and electrostatic force were the primary mechanisms of Fe^(3+)adsorption by LDPE and LLDPE,and the mechanism was not affected by linear structure.
作者
章萍
郁李
曾博
李雨洁
张吴
毛玉婷
邹友琴
ZHANG Ping;YU Li;ZENG Bo;LI Yujie;ZHANG Wu;MAO Yuting;ZOU Youqin(School of Resources and Environment,Nanchang University,Nanchang 330031,China;Key Laboratory of Poyang Lake Environment and Resource Utilization,Ministry of Education,Nanchang University,Nanchang 330031,China;Nanchang Ecological Environment Monitoring Center,Nanchang 330038,China;Jiangxi Research Academy of Ecological Civilization,Nanchang 330036,China)
出处
《南昌大学学报（工科版）》
CAS
2024年第3期276-284,306,共10页
Journal of Nanchang University(Engineering & Technology)
基金
国家自然科学基金资助项目(52160020)
江西省重点研发计划“揭榜挂帅”项目(20223BBG71014)。
