Redispersion Behavior of 2D MoS2 Nanosheets: Unique Dependence on the Intervention Timing of Natural Organic Matter

Liu，Bei1; Han，Zixin1; Han，Qi1; Shu，Yufei1; Li，Li1; Chen，Beizhao1; Wang，Zhongying1; Pedersen，Joel A.2

2023-01-17

10.1021/acs.est.2c05282

Environmental Science and Technology   影响因子和分区

0013-936X

1520-5851

The aggregation-redispersion behavior of nanomaterials determines their transport, transformation, and toxicity, which could be largely influenced by the ubiquitous natural organic matter (NOM). Nonetheless, the interaction mechanisms of two-dimensional (2D) MoS and NOM and the subsequent influences on the redispersion behavior are not well understood. Herein, we investigated the redispersion of single-layer MoS (SL-MoS) nanosheets as influenced by Suwannee River NOM (SRNOM). It was found that SRNOM played a decisive role on the redispersion of MoS 2D nanosheets that varied distinctly from the 3D nanoparticles. Compared to the poor redispersion of MoS aggregates in the absence or post-addition of SRNOM to the aggregates, co-occurrence of SRNOM in the dispersion could largely enhance the redispersion and mobility of MoS by intercalating into the nanosheets. Upon adsorption to SL-MoS, SRNOM enhanced the hydration force and weakened the van der Waals forces between nanosheets, leading to the redispersion of the aggregates. The SRNOM fractions with higher molecular mass imparted better dispersity due to the preferable sorption of the large molecules onto SL-MoS surfaces. This comprehensive study advances current understanding on the transport and fate of nanomaterials in the water system and provides fresh insights into the interaction mechanisms between NOM and 2D nanomaterials.

aggregation redispersion transformation transition metal dichalcogenides (TMDs) two-dimensional nanomaterials

SCI ; EI

英语

NI论文

第一 ; 通讯

WOS:000898835200001

20230513466066

Aggregates ; Biogeochemistry ; Layered semiconductors ; Molybdenum compounds ; Nanosheets ; Nanostructured materials ; Organic compounds ; Timing circuits ; Van der Waals forces

Highway Engineering:406 ; Concrete Reinforcements:412.2 ; Geochemistry:481.2 ; Metallurgy and Metallography:531 ; Semiconducting Materials:712.1 ; Pulse Circuits:713.4 ; Nanotechnology:761 ; Biochemistry:801.2 ; Physical Chemistry:801.4 ; Organic Compounds:804.1 ; Atomic and Molecular Physics:931.3 ; Solid State Physics:933 ; Crystalline Solids:933.1

ENVIRONMENT/ECOLOGY

2-s2.0-85146365228

Scopus

1.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Department of Environmental Health and Engineering,Johns Hopkins University,Baltimore,21218,United States

Liu，Bei,Han，Zixin,Han，Qi,et al. Redispersion Behavior of 2D MoS2 Nanosheets: Unique Dependence on the Intervention Timing of Natural Organic Matter[J]. Environmental Science and Technology,2023,57(2):939-950.

Liu，Bei.,Han，Zixin.,Han，Qi.,Shu，Yufei.,Li，Li.,...&Pedersen，Joel A..(2023).Redispersion Behavior of 2D MoS2 Nanosheets: Unique Dependence on the Intervention Timing of Natural Organic Matter.Environmental Science and Technology,57(2),939-950.

Liu，Bei,et al."Redispersion Behavior of 2D MoS2 Nanosheets: Unique Dependence on the Intervention Timing of Natural Organic Matter".Environmental Science and Technology 57.2(2023):939-950.