Synergistic Effect of Metal Cations and Visible Light on 2D MoS2Nanosheet Aggregation

Liu，Bei1; Han，Qi1; Li，Li1; Zheng，Sunxiang2; Shu，Yufei1; Pedersen，Joel A.3; Wang，Zhongying1

2021

10.1021/acs.est.1c03576

ENVIRONMENTAL SCIENCE & TECHNOLOGY   影响因子和分区

0013-936X

1520-5851

Aggregation significantly influences the transport, transformation, and bioavailability of engineered nanomaterials. Two-dimensional MoS2 nanosheets are one of the most well-studied transition-metal dichalcogenide nanomaterials. Nonetheless, the aggregation behavior of this material under environmental conditions is not well understood. Here, we investigated the aggregation of single-layer MoS2 (SL-MoS2) nanosheets under a variety of conditions. Trends in the aggregation of SL-MoS2 are consistent with classical Derjaguin-Landau-Verwey-Overbeek (DLVO) colloidal theory, and the critical coagulation concentrations of cations follow the order of trivalent (Cr3+) < divalent (Ca2+, Mg2+, Cd2+) < monovalent cations (Na+, K+). Notably, Pb2+ and Ag+ destabilize MoS2 nanosheet suspensions much more strongly than do their divalent and monovalent counterparts. This effect is attributable to Lewis soft acid-base interactions of cations with MoS2. Visible light irradiation synergistically promotes the aggregation of SL-MoS2 nanosheets in the presence of cations, which was evident even in the presence of natural organic matter. The light-accelerated aggregation was ascribed to dipole-dipole interactions due to transient surface plasmon oscillation of electrons in the metallic 1T phase, which decrease the aggregation energy barrier. These results reveal the phase-dependent aggregation behaviors of engineered MoS2 nanosheets with important implications for environmental fate and risk.

2D nanomaterials aggregation and sedimentation environmental behavior molybdenum disulfide visible light

SCI ; EI

英语

NI论文

第一 ; 通讯

National Nature Science Foundation of China[22076075,41907296] ; China Postdoctoral Foundation[2020M682776] ; National Science Foundation under the NSF Center for Sustainable Nanotechnology[CHE-2001611]

Engineering ; Environmental Sciences & Ecology

Engineering, Environmental ; Environmental Sciences

WOS:000759471400012

AMER CHEMICAL SOC

20214110993867

Biochemistry ; Layered semiconductors ; Light ; Molybdenum compounds ; Nanosheets ; Nanostructured materials ; Positive ions ; Silver compounds ; Surface plasmons ; Transition metals

Metallurgy and Metallography:531 ; Semiconducting Materials:712.1 ; Light/Optics:741.1 ; Nanotechnology:761 ; Biochemistry:801.2 ; Plasma Physics:932.3 ; Solid State Physics:933 ; Crystalline Solids:933.1

ENVIRONMENT/ECOLOGY

2-s2.0-85116518226

Scopus

1.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Andlinger Center for Energy and the Environment,Princeton University,Princeton,08544,United States
3.Departments of Soil Science,Civil and Environmental Engineering,and Chemistry,University of Wisconsin,Madison,53706,United States

Liu，Bei,Han，Qi,Li，Li,et al. Synergistic Effect of Metal Cations and Visible Light on 2D MoS2Nanosheet Aggregation[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2021,55(24):16379-16389.

Liu，Bei.,Han，Qi.,Li，Li.,Zheng，Sunxiang.,Shu，Yufei.,...&Wang，Zhongying.(2021).Synergistic Effect of Metal Cations and Visible Light on 2D MoS2Nanosheet Aggregation.ENVIRONMENTAL SCIENCE & TECHNOLOGY,55(24),16379-16389.

Liu，Bei,et al."Synergistic Effect of Metal Cations and Visible Light on 2D MoS2Nanosheet Aggregation".ENVIRONMENTAL SCIENCE & TECHNOLOGY 55.24(2021):16379-16389.