文献类型：期刊文献

英文题名：Efficient adsorption of aged microplastics by a lignin-based hydrogel: Performance and mechanism

作者：Xia, Qi He, Linjing Cai, Xiaohua Nie, Dengpan Leng, Yanli Li, Xiaohong Wang, Huanjiang Liu, Ying

第一作者：Xia, Qi

通信作者：Li, XH[1];Liu, Y[2]

机构：[1]Guizhou Minzu Univ, Sch Chem Engn, Guiyang 550025, Guizhou, Peoples R China;[2]Guizhou Inst Technol, Sch Chem Engn, Guiyang 550025, Peoples R China

第一机构：Guizhou Minzu Univ, Sch Chem Engn, Guiyang 550025, Guizhou, Peoples R China

通信机构：corresponding author), Guizhou Minzu Univ, Sch Chem Engn, Guiyang 550025, Guizhou, Peoples R China;corresponding author), Guizhou Inst Technol, Sch Chem Engn, Guiyang 550025, Peoples R China.|贵州理工学院化学工程学院;贵州理工学院;

年份：2026

卷号：14

期号：5

外文期刊名：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING

收录：;EI(收录号：20263421333648);Scopus(收录号：2-s2.0-105047666371);WOS:【SCI-EXPANDED(收录号:WOS:001856209600001)】；

基金：This work was financially supported by National Natural Science Foundation of China (52160010, 42277403) , Guizhou Provincial Basic Research Program (Natural Science) (No.QiankeheJichu ZK [2024] yiban 503, QiankeheJichu ZK [2023] yiban 132,QiankeheJichu MS [2026] 264) , Guizhou Provincial Major Science and Technology Program (No. Qiankehe zhongdazhuanxinag [2024] -001) , Central Government Program for Local Science and Technology Development Project (No. Qiankehe Zhongyindi [2025] 007) , Guizhou Provincial Key Science and Technology Program (No. Qiankeherencai XKBF [2025] 003, Guizhou Provincial Science and Technology Support Program (No. Qiankehe zhicheng [2025] yiban 007) .

语种：英文

外文关键词：Microplastics; Aging; PH effect; Adsorption; Mechanism

摘要：Aging of microplastics in the environment is common and poses risks to ecosystem health. Therefore, it is crucial to develop effective strategies for removing aged microplastics. In this study, the aging behavior of 1 & micro;m and 5 & micro;m polystyrene (PS) microplastics under various pH conditions was systematically investigated in simulated real water environments using UV and/or H2O2 treatments. The results indicate that 1 & micro;m and 5 & micro;m PS microplastics underwent significant aging and fragmentation during UV/H2O2 treatment under both neutral and alkaline conditions, resulting in smaller particles with an increased presence of oxygen-containing functional groups. Subsequently, a green lignin-based hydrogel (LG-GH-PVA@2) was developed for the efficient adsorption of aged PS. Compared to pristine PS, the hydrogel's adsorption capacity for aged PS increased by 105.5% at pH 7.0, with equilibrium adsorption capacities of 347.3 +/- 15.81, 395.7 +/- 17.65, and 427.6 +/- 16.42 mg/g at pH 3.0, 7.0, and 10.0, respectively. Experimental characterization, density functional theory (DFT) calculations, and wavefunction-based visualization analyses of noncovalent interactions in real space were performed. For pristine PS, the primary adsorption enhancement mechanisms involved pi-pi stacking and C-H & sdot;& sdot;& sdot;pi interactions. Notably, the aged PS surface exhibited a higher concentration of oxygen-containing functional groups and increased polarity, resulting in a predominant shift in the adsorption mechanism toward stronger hydrogen bonding and electrostatic interactions. More importantly, this study not only advances the understanding of the environmental aging behavior and interfacial mechanisms of microplastics but also provides a novel strategy for developing targeted remediation technologies based on the self-evolution patterns of microplastics.