Photocatalytic Degradation of Rhodamine B on MoS2 Microspheres Prepared by Sodium Dialkyldithiophosphate-Assisted Hydrothermal Synthesis

MoS 2 microspheres were synthesized via a facile hydrothermal method using (NH 4 ) 2 MoO 4 , H 2 C 2 O 4 ·2H 2 O, and sodium dialkyldithiophosphate (NaDDP) as reactants. Herein, NaDDP plays a role of surfactant for the formation of the MoS 2 microspheres, unlike other different sulfur sources. The m...

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Bibliographic Details
Published in:Kinetics and catalysis 2023-06, Vol.64 (3), p.241-249
Main Authors: Ri, Yu-Il, Kim, Jong-Min, Kim, Kyong-Il
Format: Article
Language:English
Subjects:
Ammonium molybdate
Catalysis
Catalytic activity
Chemistry
Chemistry and Materials Science
Crystal structure
Cysteine
Hydrothermal crystal growth
Microspheres
Molybdenum disulfide
Oxalic acid
Photocatalysis
Photodegradation
Physical Chemistry
Rhodamine
Sodium
Sulfur
Synthesis
Thioureas
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Summary:MoS 2 microspheres were synthesized via a facile hydrothermal method using (NH 4 ) 2 MoO 4 , H 2 C 2 O 4 ·2H 2 O, and sodium dialkyldithiophosphate (NaDDP) as reactants. Herein, NaDDP plays a role of surfactant for the formation of the MoS 2 microspheres, unlike other different sulfur sources. The morphology and crystal structure of the MoS 2 microspheres were characterized using scanning electron microscope (SEM) and X-ray diffraction (XRD). The prepared MoS 2 microspheres were used as a catalyst for photocatalytic degradation of rhodamine B. The effect of the size of the MoS 2 microspheres on photocatalytic activity was investigated. For comparison, NaDDP was replaced by thiourea, thioacetamide and L-cysteine. The results indicate that the MoS 2 microspheres are spherical, and the diameter of the MoS 2 microsphere decreases with increasing concentration of oxalic acid in the reactants. The MoS 2 microspheres have hexagonal 2H-MoS 2 structure and preferentially grow along the (002) plane. In addition, it is found that when the concentration of oxalic acid is 0.075 mol/L, the best photocatalytic efficiency is 91.3% within irradiation time of 120 min and the reaction rate constant is 0.163 min –1 . The photocatalytic activity of MoS 2 synthesized from four sulfur sources can be arranged in the following order: NaDDP > thioacetamide > L-cysteine > thiourea.
ISSN:0023-1584
1608-3210
DOI:10.1134/S0023158423030084