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

Abstract

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.

Phosphorus-Enhanced and Calcium-Retarded Transport of Ferrihydrite Colloid: Mechanism of Electrostatic Potential Changes Regulated via Adsorption Speciation

“…The values of k 1d / k 1a increased at pH 6.0 and 8.0 with increasing P concentrations, in which the values were proximate to or up to 1 in the presence of P at high concentrations (5 and 20 mg L –1 ) (Supporting Information, Table S4), indicating that the high concentrations of P caused the reversible deposition of FHC to detach from the collector . The change in the values of k 1d / k 1a and corresponding transport characteristics were similar to the data observed in dissolved organic matter, leading to the reduced deposition of other nanoparticles or colloids. ,− …”

Dynamic display of cell targeting motifs via natural glycopeptide recognition for cancer cell isolation

“…The broad peaks at 3300-3500 cm À1 in the FT-IR spectra indicated the stretching vibration of the Van-M amino group; the sharp peak at 2890 cm À1 is ascribed to the C-H stretching vibration; the peak at 1650 cm À1 is ascribed to the CQC stretching vibration; and the peak at 1240 cm À1 is ascribed to the C-O stretching vibration. 25 The above results indicated the smooth proceeding of NHS ester cross-linking and successful synthesis of Van-M.…”

Exposure Order to Photoaging and Humic Acids Significantly Modifies the Aggregation and Transformation of Nanoplastics in Aqueous Solutions

“…The dispersibility of nanoplastics in the aquatic environment is highly dependent on the interaction between NOM and nanoplastics . NOM could bind with nanoplastics through diverse attractions such as electrostatic interaction, hydrophobic effect, and hydrogen bond. − It is well documented that photoaging is likely to increase oxygen-containing groups and surface charge density of nanoplastics and thus enhance the suspending ability. , Previous attempts to explore the NOM effect on the dispersion of photoaged nanoplastics were mainly based on the structural alterations of nanoplastics during photoaging and overlook the impact of sunlight-mediated reactions between NOM and nanoplastics.…”

“…The dispersibility of nanoplastics in the aquatic environment is highly dependent on the interaction between NOM and nanoplastics. 11 NOM could bind with nanoplastics through diverse attractions such as electrostatic interaction, hydro-phobic effect, and hydrogen bond. 12−14 It is well documented that photoaging is likely to increase oxygen-containing groups and surface charge density of nanoplastics and thus enhance the suspending ability.…”