A potential threat from biodegradable microplastics: mechanism of cadmium adsorption and desorption in the simulated gastrointestinal environment

IF 6.1 2区 环境科学与生态学 Q2 ENGINEERING, ENVIRONMENTAL
Timing Jiang, Xiang Wu, Shushan Yuan, Changfei Lai, Shijie Bian, Wenbo Yu, Sha Liang, Jingping Hu, Liang Huang, Huabo Duan, Yafei Shi, Jiakuan Yang
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Abstract

It has been demonstrated that microplastics (MPs) can accumulate heavy metals from the environment and transfer them into organisms via the food chain. However, adsorption and desorption capacities for biodegradable MPs relative to those for conventional MPs remain poorly understood. In this study, cadmium (Cd(II)) adsorption and desorption characteristics of polylactic acid (PLA), a typical biodegradable MP, were investigated. Two conventional MPs, i.e., polypropylene (PP) and polyamide (PA) were used for comparison. The maximum Cd(II) adsorption capacities of the MPs studied in the adsorption experiments decreased in the order PA (0.96 ± 0.07 mg/g) > PLA (0.64 ± 0.04 mg/g) > PP (0.22 ± 0.03 mg/g). The Pseudo-second-order kinetic model and Freundlich isothermal model described the Cd(II) adsorption behaviors of PLA MPs well. X-ray photoelectron spectroscopy and two-dimensional Fourier transform infrared correlation spectroscopy analysis indicated that oxygen functional groups were the major and preferential binding sites of PLA MPs, which contributed to their high Cd(II) adsorption capacities. Simulated gastric and intestinal fluids both significantly enhanced the desorption capacities of the examined MPs. Notably, degradation of the PLA MPs during in vitro human digestion made the Cd(II) on the PLA MPs more bioaccessible (19% in the gastric phase and 62% in the intestinal phase) than Cd(II) on the PP and PA MPs. These results indicate the remarkable capacities of biodegradable MPs to accumulate Cd(II) and transfer it to the digestive system and show that biodegradable MPs might pose more severe threats to human health than conventional nonbiodegradable MPs.

Abstract Image

可生物降解微塑料的潜在威胁:镉在模拟胃肠道环境中的吸附和解吸机制
研究表明,微塑料(MPs)可以从环境中积累重金属,并通过食物链将其转移到生物体中。然而,相对于传统MPs的吸附和解吸能力,可生物降解MPs的吸附和解吸能力仍然知之甚少。研究了典型的可生物降解聚乳酸(PLA)对镉(Cd(II))的吸附和解吸特性。两种常规MPs,即聚丙烯(PP)和聚酰胺(PA)进行比较。吸附实验中所研究的MPs对Cd(II)的最大吸附量依次为PA(0.96±0.07 mg/g) >PLA(0.64±0.04 mg/g) >PP(0.22±0.03 mg/g)。拟二级动力学模型和Freundlich等温模型较好地描述了PLA MPs对Cd(II)的吸附行为。x射线光电子能谱和二维傅里叶变换红外相关光谱分析表明,氧官能团是PLA MPs的主要和优先结合位点,这是其具有高Cd(II)吸附能力的原因。模拟胃液和肠液都显著增强了所检测MPs的解吸能力。值得注意的是,在体外人体消化过程中,PLA MPs的降解使得PLA MPs上的Cd(II)比PP和PA MPs上的Cd(II)更具生物可及性(胃期19%,肠期62%)。这些结果表明,可生物降解的MPs具有显著的积累Cd(II)并将其转移到消化系统的能力,并表明可生物降解的MPs可能比传统的不可生物降解的MPs对人体健康造成更严重的威胁。
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来源期刊
Frontiers of Environmental Science & Engineering
Frontiers of Environmental Science & Engineering ENGINEERING, ENVIRONMENTAL-ENVIRONMENTAL SCIENCES
CiteScore
10.90
自引率
12.50%
发文量
988
审稿时长
6.1 months
期刊介绍: Frontiers of Environmental Science & Engineering (FESE) is an international journal for researchers interested in a wide range of environmental disciplines. The journal''s aim is to advance and disseminate knowledge in all main branches of environmental science & engineering. The journal emphasizes papers in developing fields, as well as papers showing the interaction between environmental disciplines and other disciplines. FESE is a bi-monthly journal. Its peer-reviewed contents consist of a broad blend of reviews, research papers, policy analyses, short communications, and opinions. Nonscheduled “special issue” and "hot topic", including a review article followed by a couple of related research articles, are organized to publish novel contributions and breaking results on all aspects of environmental field.
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