Ferrihydrite coating reduces microplastic induced soil water repellency†

IF 4.3 3区 环境科学与生态学 Q1 CHEMISTRY, ANALYTICAL
Andreas Cramer, Johanna Schmidtmann, Pascal Benard, Anders Kaestner, Matthias Engelhardt, Stefan Peiffer and Andrea Carminati
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Abstract

Addition of microplastics (MP) to soil has the potential to increase soil water repellency. However, coating of MP with soil abundant substances e.g., iron compounds, can reduce this effect. Here, we tested if pre-coating or in situ coating of MP with ferrihydrite (Fh) reduces soil water repellency. We applied hotspots of pristine and coated MP (20–75 μm, PS and PET) to sand and imaged capillary rise via neutron radiography. Capillary rise experiments in wetting–drying cycles were conducted using water and Fh suspension. Pristine MP hotspots were not wettable. Capillary rise of water into coated MP hotspots differed in wettability depending on polymer type. While coated PS was still non-wettable, water imbibed into the coated PET hotspot. Capillary rise of Fh suspensions in wetting and drying cycles also showed varying results depending on polymer type. MP hotspots were still non-wettable and local water content increased only marginally. Our results indicate that Fh coating of MP changes MP surface wettability depending on polymer type and therefore counteracts the hydrophobic properties of pristine MP. However, MP coating is likely to be slowed down by the initial hydrophobicity of pristine MP. Dynamics of MP coating and increasing wettability are key factors for biotic and abiotic degradation processes.

Abstract Image

水合铁涂层减少微塑性引起的土壤拒水性†
在土壤中添加微塑料(MP)有可能增加土壤的拒水性。然而,用土壤中丰富的物质(如铁化合物)覆盖MP可以减少这种影响。在这里,我们测试了用水合铁(Fh)预涂或原位涂MP是否会降低土壤的拒水性。我们将原始和涂层的MP (20-75 μm, PS和PET)的热点应用于沙子,并通过中子射线成像毛细管上升。用水和Fh悬浮液进行了干湿循环中的毛细上升实验。原始MP热点不可湿。毛细上升的水进入涂层MP热点不同的润湿性取决于聚合物类型。当涂覆的PS仍不可湿性时,水被吸收到涂覆的PET热点中。在不同的聚合物类型下,Fh悬浮液在干湿循环中的毛细上升也表现出不同的结果。MP热点仍然不可润湿,局部含水量仅略有增加。我们的研究结果表明,聚合物的Fh涂层根据聚合物类型改变了MP的表面润湿性,从而抵消了原始MP的疏水性。然而,原始MP的初始疏水性可能会减慢MP涂层的速度。MP涂层的动态和润湿性的增加是生物和非生物降解过程的关键因素。
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来源期刊
Environmental Science: Processes & Impacts
Environmental Science: Processes & Impacts CHEMISTRY, ANALYTICAL-ENVIRONMENTAL SCIENCES
CiteScore
9.50
自引率
3.60%
发文量
202
审稿时长
1 months
期刊介绍: Environmental Science: Processes & Impacts publishes high quality papers in all areas of the environmental chemical sciences, including chemistry of the air, water, soil and sediment. We welcome studies on the environmental fate and effects of anthropogenic and naturally occurring contaminants, both chemical and microbiological, as well as related natural element cycling processes.
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