Enhanced visible light-driven photocatalytic activity of reduced graphene oxide/cadmium sulfide composite: Methylparaben degradation mechanism and toxicity

Reduced graphene oxide/cadmium sulfide (RGOCdS) nanocomposite synthesized through solvothermal process was used for methylparaben (MeP) degradation. The crystallinity of the nanocomposite was ascertained through X-ray diffraction. High resolution transmission electron microscope (HRTEM) results prov...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2021-02, Vol.264 (Pt 1), p.128481-128481, Article 128481
Main Authors: Mohan, Harshavardhan, Ramalingam, Vaikundamoorthy, Karthi, Natesan, Malathidevi, Sundaramoorthy, Shin, Taeho, Venkatachalam, Janaki, Seralathan, Kamala-Kannan
Format: Article
Language:English
Subjects:
Cadmium Compounds
CdS
Degradation
Graphite
Light
Methylparaben
Parabens
Photocatalysis
RGO
Sulfides
Tandem Mass Spectrometry
Titanium
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Summary:Reduced graphene oxide/cadmium sulfide (RGOCdS) nanocomposite synthesized through solvothermal process was used for methylparaben (MeP) degradation. The crystallinity of the nanocomposite was ascertained through X-ray diffraction. High resolution transmission electron microscope (HRTEM) results proved the absence of any free particle beyond the catalyst surface ensuring the composite nature of the prepared material. The enhancement in the activity on doping with RGO was substantiated by diffuse reflectance spectroscopy (DRS-UV). It is evident from the photocatalytic degradation experiments that RGOCdS is more efficient than pure CdS. Maximum MeP degradation (100%) was achieved after 90 min of irradiation with 750 mg/L RGOCdS dosage at an acidic pH of 3, for an initial MeP concentration of 30 mg/L. The degradation mechanism substantiated through HPLC-MS/MS analysis showed the complete degradation of MeP without any residual intermediaries. The catalyst could be sustained and reused for up to 9 cycles of usage. Phytotoxicity and mycotoxicity results evidently ascertain the environmental implications of the photocatalyst material. [Display omitted] •CdS decorated graphene (RGOCdS) composite effectively degraded MeP.•MeP degradation mechanism was proposed based on the intermediates.•Impact of additives and stability of the composite was established.•Several organic pollutants showed effective degradation by RGOCdS.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2020.128481