水体组分对聚苯乙烯纳米颗粒聚沉行为的影响 |
摘要点击 1163 全文点击 198 投稿时间:2023-02-05 修订日期:2023-04-24 |
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中文关键词 聚苯乙烯(PS) 纳米颗粒 团聚 沉降 环境水体 |
英文关键词 polystyrene (PS) nano-plastics aggregation sedimentation environmental waters |
作者 | 单位 | E-mail | 汤端阳 | 长江大学油气地球化学与环境湖北省重点实验室, 武汉 430100 生态环境部华南环境科学研究所, 广州 510530 生态环境部生态环境应急研究所, 广州 510530 | 1781954130@qq.com | 郑文丽 | 生态环境部华南环境科学研究所, 广州 510530 生态环境部生态环境应急研究所, 广州 510530 | | 陈关潼一 | 生态环境部华南环境科学研究所, 广州 510530 生态环境部生态环境应急研究所, 广州 510530 | | 陈思莉 | 生态环境部华南环境科学研究所, 广州 510530 生态环境部生态环境应急研究所, 广州 510530 | | 陈尧 | 生态环境部华南环境科学研究所, 广州 510530 生态环境部生态环境应急研究所, 广州 510530 | | 赵晓丽 | 中国环境科学研究院环境基准与风险评估国家重点实验室, 北京 100012 | | 汪浩 | 生态环境部华南环境科学研究所, 广州 510530 生态环境部生态环境应急研究所, 广州 510530 | wanghao@scies.org |
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中文摘要 |
微/纳米塑料在环境水体中的团聚和沉降行为是影响其迁移和分布的重要因素.以聚苯乙烯纳米颗粒(PS-NPs)为对象,研究了Na+和天然有机质(NOM)两种典型水体组分对其团聚粒径和沉降性能的影响规律,分析了海水、湖水和生活污水等6种水体中团聚、沉降效果及潜在影响因子.结果表明,c(Na+) < 80 mmol·L-1时有利于PS-NPs沉降;反之,则促进其团聚和悬浮.NOM可借助Na+在颗粒表面形成多层吸附结构,改变颗粒表面电势和相对密度,进而影响PS-NPs团聚和沉降性能.ρ(NOM) > 10 mg·L-1时可增强PS-NPs分散和悬浮性能,可能归因于大量附着在颗粒表面的NOM降低了PS-NPs相对密度.环境水体较实验室合成水体更能促进颗粒团聚,这可能与环境水体富含氨基酸和蛋白质等大分子有关. |
英文摘要 |
The aggregation and sedimentation of micro/nano-plastics significantly affect their migration and distribution in the environment. This study investigated the effects of Na+ and natural organic matter (NOM) on the aggregation and sedimentation of polystyrene nano-plastics (PS-NPs) in the aqueous phase. Six types of water, such as seawater, lake water, and domestic sewage, were used to evaluate the above effects and other potential influencing factors. The results indicated that Na+ could facilitate the sedimentation of PS-NPs when it was less than 80 mmol·L-1, whereas it could promote the aggregation and suspension of PS-NPs when the concentration was greater than 80 mmol·L-1. NOM molecules affected the aggregation and sedimentation of PS-NPs by changing the ζ potential and relative density of particles via forming a multilayer adsorption structure with Na+ on the particle surface. It was observed that NOM greater than 10 mg·L-1 enhanced the dispersion and suspension of PS-NPs, which might have been attributed to the decrease in relative density of the particles as a large amount of NOM was absorbed onto the surface. Compared with synthetic waters, environmental waters enhanced the aggregation of PS-NPs, which may have been related to the amino acid, protein, and other organic macro-molecules in the water. |