Effects of solution chemistry and humic acid on the transport of polystyrene microplastics in manganese oxides coated sand

Tan, Miaomiao; Liu, Longfei; Zhang, Minggu; Yan-li, Liu; Li, Chengliang

doi:10.1016/j.jhazmat.2021.125410

Cited by 59 publications

(26 citation statements)

References 40 publications

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“…Due to the unsaturated coordination, GT easily coordinated with water and formed a hydroxylated surface after water dissociation. The surface hydroxyl group of GT could undergo proton migration, showing amphoteric oxidation characteristics and finally resulting in NPs adsorption . Although GT caused the retardation of 50NPs, the retention was primarily in reversible sites, which corresponded to high k 1a and low k 2a values (SI Table S4).…”

Section: Resultsmentioning

confidence: 99%

Effect of Agricultural Organic Inputs on Nanoplastics Transport in Saturated Goethite-Coated Porous Media: Particle Size Selectivity and Role of Dissolved Organic Matter

Qiu

Zhao

et al. 2022

Environ. Sci. Technol.

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The transport of nanoplastics (NPs) through porous media is influenced by dissolved organic matter (DOM) released from agricultural organic inputs. Here, cotransport of NPs with three types of DOM (biochar DOM (BC DOM ), wheat straw DOM (WS DOM ), and swine manure DOM (SM DOM )) was investigated in saturated goethite (GT)coated sand columns. The results showed that codeposition of 50 nm NPs (50NPs) with DOM occurred due to the formation of a GT− DOM−50NPs complex, while DOM loaded on GT-coated sand and 400 nm NPs (400NPs) aided 400NPs transport due to electrostatic repulsion. According to the quantum chemical calculation, humic acid and cellulose played a significant role in 50NPs retardation. Owing to its high concentration, moderate humification index (HIX), and cellulose content, SM DOM exhibited the highest retardation of 50NPs transport and promoting effect on 400NPs transport. Owing to a high HIX, the effect of BC DOM on the mobility of 400NPs was higher than that of WS DOM . However, high cellulose content in WS DOM caused it to exhibit a 50NPs retardation ability that was similar to that of BC DOM . Our results highlight the particle size selectivity and significant influence of DOM type on the transport of NPs and elucidate their quantum and colloidal chemical-interface mechanisms in a typical agricultural environment.

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Section: Resultsmentioning

confidence: 99%

Effect of Agricultural Organic Inputs on Nanoplastics Transport in Saturated Goethite-Coated Porous Media: Particle Size Selectivity and Role of Dissolved Organic Matter

Qiu

Zhao

et al. 2022

Environ. Sci. Technol.

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“…Another possibility was that part of HA molecules rst adsorbed on the surface of PSMPs, which introduced more functional groups (-COOH and -OH), and functioned as anchors and aid adsorption in the adsorption of Pb 2+ (Qi et al 2021). The negative charged functional groups (-COOH and -OH) of HA increased the negative charge of PSMPs surface when combined with PSMPs , and thus enhancing the electrostatic interaction between PSMPs and Pb 2+ (Tan et al 2021). This principle was similar to the bio lm on the surface of microplastics .…”

Section: Effect Of Different Ha Concentration On Pb 2+ Adsorption Onto Psmpsmentioning

confidence: 79%

Humic Acid Promotes the Adsorption of Lead onto PSMPs: Site Energy Distribution Theory and Fluorescence Quenching Analysis

Feng

Wei

et al. 2021

Preprint

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Microplastics (MPs) have a great potential to adsorb heavy metal pollutants such as Pb2+ and the dissolved organic matter(DOM) in the aquatic environment will affect this adsorption behavior. In this study, batch experiments were performed to investigate the adsorption characteristics of Pb2+ onto polystyrene microplastics (PSMPs) in the presence and absence of HA(a kind of representative DOM). The adsorption kinetics of Pb2+ onto PSMPs conformed to the pseudo-second order model, and the adsorption isotherms were well fitted by the Langmuir model. With the increase of HA concentration, the Pb2+ adsorption onto PSMPs increased. Site energy distribution analysis showed that the presence of HA increased the adsorption site energy of PSMPs, thus enhancing the adsorption capacity for Pb2+. The fluorescence quenching analysis of HA further indicated that part of HA were adsorbed onto PSMPs, which increased additional binding sites on the surface of PSMPs. This was attributed to the abundant functional groups that could react with Pb2+ of HA. The pH and ionic strength of solution changed the structure of HA and the adsorption sites of PSMPs, which influenced the adsorption capacity of PSMPs for Pb2+. This study illustrated the effect of HA on the process and mechanism of Pb2+ adsorption onto PSMPs, and provided more information for the evaluation of environmental behavior and toxicological effects of microplastics in aquatic environments.

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“…This is because the humic/fulvic acid layer could act as a scavenger of oxidative radicals and optical light filters. In addition, the NOM corona may facilitate the transportation of M/NPs in porous media [ 158 ], seawater [ 159 ] and sands [ 160 ] and stabilize M/NPs by reducing aggregation and sedimentation [ 161 ]. In addition to environmental migration, NOM coronas showed differential effects in safety assessments of M/NPs.…”

Section: Corona Formation On Micro/nanoplasticsmentioning

confidence: 99%

Coronas of micro/nano plastics: a key determinant in their risk assessments

et al. 2022

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As an emerging pollutant in the life cycle of plastic products, micro/nanoplastics (M/NPs) are increasingly being released into the natural environment. Substantial concerns have been raised regarding the environmental and health impacts of M/NPs. Although diverse M/NPs have been detected in natural environment, most of them display two similar features, i.e.,high surface area and strong binding affinity, which enable extensive interactions between M/NPs and surrounding substances. This results in the formation of coronas, including eco-coronas and bio-coronas, on the plastic surface in different media. In real exposure scenarios, corona formation on M/NPs is inevitable and often displays variable and complex structures. The surface coronas have been found to impact the transportation, uptake, distribution, biotransformation and toxicity of particulates. Different from conventional toxins, packages on M/NPs rather than bare particles are more dangerous. We, therefore, recommend seriously consideration of the role of surface coronas in safety assessments. This review summarizes recent progress on the eco–coronas and bio-coronas of M/NPs, and further discusses the analytical methods to interpret corona structures, highlights the impacts of the corona on toxicity and provides future perspectives.

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Effects of solution chemistry and humic acid on the transport of polystyrene microplastics in manganese oxides coated sand

Cited by 59 publications

References 40 publications

Effect of Agricultural Organic Inputs on Nanoplastics Transport in Saturated Goethite-Coated Porous Media: Particle Size Selectivity and Role of Dissolved Organic Matter

Effect of Agricultural Organic Inputs on Nanoplastics Transport in Saturated Goethite-Coated Porous Media: Particle Size Selectivity and Role of Dissolved Organic Matter

Humic Acid Promotes the Adsorption of Lead onto PSMPs: Site Energy Distribution Theory and Fluorescence Quenching Analysis

Coronas of micro/nano plastics: a key determinant in their risk assessments

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