Synthesis and Characterization of CdS Photocatalyst with Different Morphologies: Visible Light Activated Dyes Degradation Study

CdS nanoparticles (CdS NPs) and CdS nanoslabs (CdS NSs) were synthesized from the single source (SS) and multi-source (MS) precursors, respectively. Our target was to observe any change in morphology by altering the synthetic route. CdS NPs with spherical morphology (0.2–0.5 µm in diameter) were obt...

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Bibliographic Details
Published in:Kinetics and catalysis 2018-11, Vol.59 (6), p.710-719
Main Authors: Hussain, W., Malik, H., Bahadur, A., Hussain, R. A., Shoaib, M., Iqbal, Sh, Hussain, H., Green, I. R., Badshah, A., Li, H.
Format: Article
Language:English
Subjects:
Catalysis
Catalytic activity
Chemistry
Chemistry and Materials Science
Diffraction patterns
Dyes
Energy dispersive X ray spectroscopy
Energy transmission
Malachite green
Methylene blue
Microscopy
Morphology
Nanoparticles
NMR
Nuclear magnetic resonance
Photocatalysis
Photodegradation
Physical Chemistry
Precursors
Rate constants
Rhodamine
Scanning electron microscopy
Synthesis
Transmission electron microscopy
X-ray diffraction
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Summary:CdS nanoparticles (CdS NPs) and CdS nanoslabs (CdS NSs) were synthesized from the single source (SS) and multi-source (MS) precursors, respectively. Our target was to observe any change in morphology by altering the synthetic route. CdS NPs with spherical morphology (0.2–0.5 µm in diameter) were obtained by using the SS precursor route via the formation of a Cd-complex. CdS NSs (100–200 nm in length, 50–100 nm wide and 25–50 nm in thickness) were obtained by using the MS precursors, by direct addition of the ligand to metal salt. Both NPs and NSs were used for the degradation of four different cationic organic dyes viz., malachite green (MG), methylene blue (MB), rhodamine B (RhB) and methyl violet (MV) under visible light. CdS NPs synthesized from SS precursor exhibited higher photocatalytic activity than CdS NSs fabricated via MS precursor due to spherical morphologies (small size of particles increases the surface area) and higher band gap. On the other hand, CdS NSs show sheet or cube like morphologies. The kinetic study proved that the rate constants for the MG, MB, MV, and RhB degradation by CdS NPs (1.65 × 10 –2 , 1.25 × 10 –2 , 1.2 × 10 –2 , and 1.24 × 10 –2 min –1 , respectively) are higher than those for CdS NSs (1.45 × 10 –2 , 1.13 × 10 –2 , 1.05 × 10 –2 , 1.14 × 10 –2 min –1 , respectively). The precursors were characterized by 1 H and 13 C nuclear magnetic resonance. Phase pattern and composition of CdS were confirmed by X-ray diffraction and energy dispersive X-ray spectroscopy. Morphology and size were confirmed by transmission electron microscopy and scanning electron microscopy.
ISSN:0023-1584
1608-3210
DOI:10.1134/S0023158418060058