研究目的
Investigating the photocatalytic effects of mesoporous molybdenum disulfide (MoS2) on the removal of methylene blue (MB) as an environmental pollutant organic dye.
研究成果
Mesoporous MoS2 nanostructures synthesized by hydrothermal method showed excellent photocatalytic activity for the removal of methylene blue under visible light at room temperature, achieving 99.6% removal in 15 minutes. This performance is significantly higher than that of bulk MoS2, attributed to the high surface area and larger pore volume of the mesoporous structure.
研究不足
The study focuses on the removal of methylene blue under specific conditions (pH = 7, room temperature, visible light). The performance under other conditions or with other pollutants was not investigated.
1：Experimental Design and Method Selection:
The mesoporous MoS2 was synthesized by hydrothermal method using Sodium molybdate and Sodium sulfide. The physicochemical properties were characterized by X-ray diffraction analysis, scanning electron microscopy, and Brunauer–Emmett–Teller surface area analysis.
2：Sample Selection and Data Sources:
Methylene blue (MB) was used as the model pollutant.
3：List of Experimental Equipment and Materials:
Sodium molybdate (Na2MoO4·2H2O), Sodium sulfide (Na2S·9H2O), Hydrochloric acid (HCl, 37%), Sodium hydroxide, Philips X’pert powder diffractometer, Quan-tachrome NOVA Instruments, SEM (KYKY, EM-3200), Metrohm 691 pH meter, Varian model CARY 50 UV-vis spectrophotometer.
4：Experimental Procedures and Operational Workflow:
The synthesis involved dissolving Na2MoO4 in distilled water, adding Na2S, adjusting pH to 1 with HCl, heating at 180°C for 24 hours, centrifuging, washing, drying, and annealing. The removal efficiency of MB was measured by UV-Vis spectrophotometry.
5：Data Analysis Methods:
The efficiency of MB removal was calculated from the percent relative deviation of absorbance from its initial value.
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Sodium molybdate
Na2MoO4·2H2O
Merck
Precursor for the synthesis of MoS2
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Sodium sulfide
Na2S·9H2O
Merck
Reducing agent in the synthesis of MoS2
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Hydrochloric acid
HCl, 37%
Merck
pH adjustment in the synthesis process
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Philips X’pert powder diffractometer
Philips
X-ray diffraction analysis
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Quan-tachrome NOVA Instruments
Quan-tachrome
Nitrogen adsorption–desorption isotherms studies
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SEM
KYKY, EM-3200
KYKY
Morphology examination
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Metrohm 691 pH meter
Metrohm
pH measurement
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Varian model CARY 50 UV-vis spectrophotometer
Varian
Quantitative determinations of methylene blue
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