Effectively enhanced piezocatalytic activity in flower-like 2H-MoS2 with tunable S vacancy towards organic pollutant degradation

Li，Rui1; Liang，Shuoyang1; Aihemaiti，Aikelaimu1; Li，Shun2; Zhang，Zuotai1,3

2023-09-15

10.1016/j.apsusc.2023.157461

Applied Surface Science   影响因子和分区

0169-4332

1873-5584

Piezocatalysis technology is emerging as a promising strategy for removing organic pollutants from water by harvesting mechanical energy from the surrounding environment. Herein, 2H-MoS flower-like nanosheets with tunable S vacancies was synthesized via a hydrothermal method by adjusting pH of the precursor solution, Mo and S molar ratio, reaction time and temperature. The results showed that the presence of S vacancy leads to significantly enhanced piezoelectric response in the MoS nanosheets, as confirmed by both theoretical calculation using first-principle based density functional theory and probe force microscopy (PFM) measurements. As a result, the as-obtained MoS nanoflower piezocatalyst exhibited excellent degradation efficiency for Orange Ⅱ solution (removal rate > 95 % in 1 h) under ultrasonic vibration (40 kHz and 110 W). Importantly, we demonstrated for the first time that the piezocatalytic performance was tightly related with the water level in ultrasonic cleaner. The present work not only reports a simple and effective strategy for improving the piezocatalytic degradation activity of MoS by introducing vacancy, but also provides new insights and deeper understanding on the underlying mechanism.

Degradation Mechanism MoS2 Piezocatalytic S vacancy

SCI ; EI

英语

第一

National Natural Science Foundation of China[52225407];

Chemistry ; Materials Science ; Physics

Chemistry, Physical ; Materials Science, Coatings & Films ; Physics, Applied ; Physics, Condensed Matter

WOS:001003163900001

ELSEVIER

20232114118164

Degradation ; Density functional theory ; Layered semiconductors ; Molar ratio ; Nanosheets ; Organic pollutants ; Ultrasonic effects ; Water levels ; Water pollution

Water Pollution:453 ; Semiconducting Materials:712.1 ; Ultrasonic Waves:753.1 ; Nanotechnology:761 ; Physical Chemistry:801.4 ; Chemical Reactions:802.2 ; Organic Compounds:804.1 ; Probability Theory:922.1 ; Atomic and Molecular Physics:931.3 ; Quantum Theory; Quantum Mechanics:931.4 ; Solid State Physics:933

MATERIALS SCIENCE

2-s2.0-85159550504

Scopus

1.School of Environmental Science and Engineering,Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,Southern University of Science and Technology,Shenzhen,518055,China
2.Institute of Quantum and Sustainable Technology (IQST),School of Chemistry and Chemical Engineering,Jiangsu University,Zhenjiang,Jiangsu,212013,China
3.Key Laboratory of Municipal Solid Waste Recycling Technology and Management of Shenzhen City,Shenzhen,518055,China

Li，Rui,Liang，Shuoyang,Aihemaiti，Aikelaimu,et al. Effectively enhanced piezocatalytic activity in flower-like 2H-MoS2 with tunable S vacancy towards organic pollutant degradation[J]. Applied Surface Science,2023,631.

Li，Rui,Liang，Shuoyang,Aihemaiti，Aikelaimu,Li，Shun,&Zhang，Zuotai.(2023).Effectively enhanced piezocatalytic activity in flower-like 2H-MoS2 with tunable S vacancy towards organic pollutant degradation.Applied Surface Science,631.

Li，Rui,et al."Effectively enhanced piezocatalytic activity in flower-like 2H-MoS2 with tunable S vacancy towards organic pollutant degradation".Applied Surface Science 631(2023).