Polypropylene microplastics alter the cadmium adsorption capacity on different soil solid fractions

doi:10.1007/s11783-021-1437-z

Front. Environ. Sci. Eng.

2022, Vol. 16

Issue (1) : 3 https://doi.org/10.1007/s11783-021-1437-z

RESEARCH ARTICLE

Polypropylene microplastics alter the cadmium adsorption capacity on different soil solid fractions

Xianying Ma^1,², Xinhui Zhou^1,², Mengjie Zhao^1,², Wenzhuo Deng^1,², Yanxiao Cao^1,²(

), Junfeng Wu³, Jingcheng Zhou^1,²(

)

¹. School of Information and Safety Engineering, Zhongnan University of Economics and Law, Wuhan 430073, China
². Research Center for Environment and Health, Zhongnan University of Economics and Law, Wuhan 430073, China
³. Wuhan Regen Environmental Remediation Co., Ltd, Wuhan 430073, China

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Abstract

• PP-MPs reduced the adsorption capacity of the bulk soil for Cd in aqueous medium.

• The responses of the POM, OMC and mineral fractions to PP-MPs were different.

• PP-MPs reduced the adsorption of POM and OMC fractions to Cd.

• PP-MPs increased the adsorption of mineral fraction to Cd.

• Effect of MPs on soil may be controlled by proportion of POM, OMC and mineral fractions.

Microplastics (MPs) are widely present in a variety of environmental media and have attracted more and more attention worldwide. However, the effect of MPs on the the interaction between heavy metals and soil, especially in soil fraction level, is not well understood. In this study, batch experiments were performed to investigate the adsorption characteristics of Cd in bulk soil and three soil fractions (i.e. particulate organic matter (POM), organic-mineral compounds (OMC), and mineral) with or without polypropylene (PP) MPs. The results showed that the addition of PP-MPs reduced the Cd adsorption capacity of the bulk soil in aqueous solution, and the effects varied with PP-MPs dose and aging degree. Whereas, the responses of the three fractions to PP-MPs were different. In presence of PP-MPs, the POM and OMC fractions showed negative adsorption effects, while the mineral fraction showed positive adsorption. For the bulk soil, POM and OMC fractions, the adsorption isotherm fitted to the Langmuir model better than the Freundlich model, whereas, the Freundlich isotherm model is more fitted for the mineral fraction. Combined with the comprehensive analysis of the partitioning coefficients, XRD and FTIR results, it was found that OMC fraction extremely likely play a leading role in the bulk soil adsorption of Cd in this study. Overall, the effect of MPs on adsorption capacity of the bulk soil for Cd may be determined by the proportion of POM, OMC, and mineral fractions in the soil, but further confirmation is needed.

Keywords Polypropylene microplastics Cadmium Adsorption POM OMC Mineral

Corresponding Author(s): Yanxiao Cao,Jingcheng Zhou

Issue Date: 14 September 2021

Cite this article:

Xianying Ma,Xinhui Zhou,Mengjie Zhao, et al. Polypropylene microplastics alter the cadmium adsorption capacity on different soil solid fractions[J]. Front. Environ. Sci. Eng., 2022, 16(1): 3.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-021-1437-z
https://academic.hep.com.cn/fese/EN/Y2022/V16/I1/3

Fig.1 The experimental kinetics data for Cd adsorption onto bulk soil and three soil fractions [(a) bulk soil; (b) POM; (c) OMC; and (d) mineral].

Tab.1 Kinetic parameters of Cd adsorption by the bulk soil and three soil fractions obtained from the Elovich model before and after adding MPs

Tab.2 The average, fast and slow reaction rate [mg/(L·min)] of Cd adsorption to bulk soil and three soil fractions (POM, OMC, and mineral) before and after adding MPs

Fig.2 The isotherm models of of Cd on bulk soil and three soil fractions (POM, OMC, and mineral) before (a) and after (b) adding PP-MPs. (bulk soil, POM and OMC fractions fit by the Langmuir isotherm model; mineral fration fit by Freundlich isotherm model; The left Y-axis are bulk soil, OMC, and mineral fraction; The right Y axis is POM).

Tab.3 The Langmuir and Freundlich isotherm models parameter values of Cd adsorption to bulk soil and three soil fractions (POM, OMC, and mineral) before and after adding MPs

Tab.4 Partitioning coefficients K_d (L/g) of Cd in different solid fractions under different initial concentrations

Fig.3 SEM images of PP-MPs [virgin PP-MPs: (a) magnification: 100×, (b) magnification: 400×; aged PP-MPs: (c) magnification: 100×, (d) magnification: 400×].

Fig.4 XRD patterns of virgin PP-MPs (before and after adsorption in bulk soil, POM, OMC and mineral systems) [pdf-paraffin [(CH₂)_x] in the figure is the standard card of paraffin (JCPDS No.40-1995)].

Fig.5 FTIR spectra of virgin PP-MPs (before and after adsorption in bulk soil, POM, OMC and mineral systems) and aged PP-MPs.

Fig.6 The effect of MPs dosage on Cd adsorption to bulk soil and three soil fractions (POM, OMC, and mineral).

Fig.7 The effect of virgin and aged PP-MPs on Cd adsorption to bulk soil and three soil fractions (POM, OMC, and mineral).

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