Comparison of adsorption capacity of 4-Nonylphenol on conventional and biodegradable microplastics aged under natural water.

IF 3.5 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Journal of contaminant hydrology Pub Date : 2024-12-09 DOI:10.1016/j.jconhyd.2024.104486

Fallon Nacaratte, Anahi Valdivia, Sylvia V Copaja

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Abstract

This study investigated the adsorption of 4-Nonylphenol (4-NP) on aged microplastics (MPs) composed of polyethylene terephthalate (PET) and poly(butylene-adipate-co-terephthalate)/polylactic acid (PBAT/PLA). Morphological analysis revealed wear, wrinkles, and increased surface roughness in both aged MPs, with X-ray diffraction showing slight increases in crystallinity. Infrared spectroscopy showed an increase in the carbonyl index from 2.78 to 4.37 for PBAT/PLA and 0.51 to 2.32 for PET after aging. The natural water from the San Pedro River in Chile Atacama region (5.91 mS·cm^-1 conductivity, 3.25 PSU salinity, 2955 mg·L^-1 total dissolved solids, 435 mg·L^-1 CaCO₃ hardness) was used as the environmental medium and compared with a 0.01 mol·L^-1 CaCl₂ as a model solution. Kinetic modeling showed a decrease in 4-NP percentage removal from 90.0 % (2277 μg∙g^-1 adsorption capacity) to 50.2 % (1268 μg∙g^-1) for PET and from 86.8 % (2087 μg∙g^-1) to 70.3 % (1955 μg∙g^-1) for PBAT/PLA when comparing the model solution to natural water, with 30 and 84 h equilibrium times, respectively. Isotherm data showed that 4-NP/PET fits BET n-layer and Temkin models, while 4-NP-PBAT/PLA fits the Toth and Hill models The ionic composition of natural water induces cation attraction to polarized MPs surfaces, intensifying competition for adsorption sites. This involves ion and molecular cooperation, 4-NP reorientation, external diffusion effects, and surface oxidation variations, which are attributed to explaining the bilayer (PET) and monolayer (PBAT/PLA) formation. This work contributes to understanding MP pollution and the importance of considering the bioplastics life cycle, since their waste presents significant potential to resist external factors for transporting contaminants.

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传统微塑料和可生物降解微塑料在天然水中老化后对 4-壬基苯酚吸附能力的比较。

本研究调查了 4-壬基酚（4-NP）在由聚对苯二甲酸乙二醇酯（PET）和聚对苯二甲酸丁二醇酯/聚乳酸（PBAT/PLA）组成的老化微塑料（MPs）上的吸附情况。形态分析表明，两种老化的 MP 都存在磨损、皱纹和表面粗糙度增加的现象，X 射线衍射显示结晶度略有增加。红外光谱显示，老化后 PBAT/PLA 的羰基指数从 2.78 增加到 4.37，PET 的羰基指数从 0.51 增加到 2.32。以智利阿塔卡马地区圣佩德罗河的天然水（电导率 5.91 mS-cm-1、盐度 3.25 PSU、总溶解固体 2955 mg-L-1、CaCO3 硬度 435 mg-L-1）为环境介质，并以 0.01 mol-L-1 CaCl2 作为模型溶液进行比较。动力学模型显示，在将模型溶液与天然水进行比较时，PET 对 4-NP 的去除率从 90.0 %（吸附容量为 2277 μg∙g-1）降至 50.2 %（1268 μg∙g-1），PBAT/PLA 对 4-NP 的去除率从 86.8 %（2087 μg∙g-1）降至 70.3 %（1955 μg∙g-1），平衡时间分别为 30 小时和 84 小时。等温线数据显示，4-NP/PET 符合 BET n 层和 Temkin 模型，而 4-NP-PBAT/PLA 则符合 Toth 和 Hill 模型。这涉及到离子和分子合作、4-NP 重新定向、外部扩散效应和表面氧化变化，这些都是双层（PET）和单层（PBAT/PLA）形成的原因。这项研究有助于了解 MP 污染以及考虑生物塑料生命周期的重要性，因为生物塑料的废弃物具有抵御外部因素运输污染物的巨大潜力。

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来源期刊

Journal of contaminant hydrology 环境科学-地球科学综合

CiteScore

6.80

自引率

2.80%

发文量

129

审稿时长

68 days

期刊介绍： The Journal of Contaminant Hydrology is an international journal publishing scientific articles pertaining to the contamination of subsurface water resources. Emphasis is placed on investigations of the physical, chemical, and biological processes influencing the behavior and fate of organic and inorganic contaminants in the unsaturated (vadose) and saturated (groundwater) zones, as well as at groundwater-surface water interfaces. The ecological impacts of contaminants transported both from and to aquifers are of interest. Articles on contamination of surface water only, without a link to groundwater, are out of the scope. Broad latitude is allowed in identifying contaminants of interest, and include legacy and emerging pollutants, nutrients, nanoparticles, pathogenic microorganisms (e.g., bacteria, viruses, protozoa), microplastics, and various constituents associated with energy production (e.g., methane, carbon dioxide, hydrogen sulfide). The journal''s scope embraces a wide range of topics including: experimental investigations of contaminant sorption, diffusion, transformation, volatilization and transport in the surface and subsurface; characterization of soil and aquifer properties only as they influence contaminant behavior; development and testing of mathematical models of contaminant behaviour; innovative techniques for restoration of contaminated sites; development of new tools or techniques for monitoring the extent of soil and groundwater contamination; transformation of contaminants in the hyporheic zone; effects of contaminants traversing the hyporheic zone on surface water and groundwater ecosystems; subsurface carbon sequestration and/or turnover; and migration of fluids associated with energy production into groundwater.