Synthesis of CdS–SnS photocatalyst by chemical co-precipitation for photocatalytic degradation of methylene blue and rhodamine B under irradiation by visible light

Alikarami, Somayeh; Soltanizade, Ali; Rashchi, Fereshteh

doi:10.1016/j.jpcs.2022.110993

Cited by 29 publications

(8 citation statements)

References 80 publications

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“…Holes generated in the Ag nanoparticles, with a further negative potential compared to OH – /OH • , are unable to produce OH • radicals; although, they can readily engage in a direct reaction with dye molecules and oxidize them. The reactions presented in eqs – provide an initial clarification of the degradation reactions in the existence of various radicals. , BaTiO 3 − CNT / Ag + h ν → normalBaTiO 3 − CNT / Ag false( normalh + + e − false) O 2 + normale − → O 2 • − OH − + normalh + → normalOH • OH • / O 2 • − / normalh + + MB → normalproducts of degradation + …”

Section: Results and Discussionmentioning

confidence: 99%

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Degradation of Pollutants and Photocatalytic H₂ Evolution Using Carbon Nanotube/Ag Nanoparticle-Modified BaTiO₃ Nanoparticles

Mosavari,

Alimohammadi,

Mahdikhah

et al. 2024

ACS Appl. Nano Mater.

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A ternary nanocomposite, BaTiO 3 −CNT/Ag, was synthesized via a coprecipitation method to function as a photocatalyst for pollutant degradation and H 2 production through a water-splitting reaction. The successful preparation of the nanocomposite and the enhancement of its morphological properties were confirmed through Raman spectroscopy, X-ray diffraction/photoelectron spectroscopy (XRD/XPS), and scanning/transmission electron microscopy (SEM/TEM) studies. Utilizing transient photocurrent, photoluminescence (PL) spectroscopy, UV−visible diffuse reflectance spectroscopy (DRS), Mott−Schottky, and electrochemical impedance spectroscopy (EIS) tests, it was determined that the incorporation of carbon nanotube (CNT) and Ag into BaTiO 3 led to a promotion of charge separation efficiency up to 15 times, a decrease in the bandgap energy from 3.12 to 2.85 eV, larger band bending, lower electron/ hole recombination, and extensive lower internal resistance. In photodegradation-related studies, the response surface methodology (RSM) method was performed for experimental design to optimize the amounts of photocatalyst dosage, irradiation time, and initial dye concentration, yielding optimal values of 0.681 g/L, 67.5 min, and 1 mg/L, respectively. The sample showed outstanding photocatalytic efficiency in the degradation of different organic water pollutants, coupled with remarkable stability and reusability, as evidenced by a four-run cyclic experiment. Finally, the evaluation of H 2 production revealed a remarkable amount of 542.4 μmol/g•h for the ternary nanocomposite, which is about 5 times higher than that of the pure BaTiO 3 sample. This research provides thorough insight into the synthesis of a ternary nanocomposite that extremely enhances the charge transfer abilities and, therefore, boosts the photocatalytic H 2 production and photodegradation of pollutants.

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Section: Results and Discussionmentioning

confidence: 99%

“…The reactions presented in eqs 4−7 provide an initial clarification of the degradation reactions in the existence of various radicals. 67…”

Section: Photocatalytic Activitiesmentioning

confidence: 99%

Degradation of Pollutants and Photocatalytic H₂ Evolution Using Carbon Nanotube/Ag Nanoparticle-Modified BaTiO₃ Nanoparticles

Mosavari,

Alimohammadi,

Mahdikhah

et al. 2024

ACS Appl. Nano Mater.

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“…Especially, the band gap of K 2 InCoF 6 is the closest to the recommended range of absorption layer in single junction solar cells (1.1 to 1.4 eV), which is also suitable for light absorbers in energy storage applications . The narrower band gap is suitable as a shield for ultraviolet radiation (0.50 to 0.70 eV), and a broader band gap is suitable for tandem solar cells (>1.7 eV) and photodegradation (∼2.04 eV) . Besides, there is a novel and successful method to conduct rational p-doping or n-doping to obtain interesting electrochemical properties …”

Section: Resultsmentioning

confidence: 99%

“…73 The narrower band gap is suitable as a shield for ultraviolet radiation (0.50 to 0.70 eV), 74 and a broader band gap is suitable for tandem solar cells (>1.7 eV) 75 and photodegradation (∼2.04 eV). 76 Besides, there is a novel and successful method to conduct rational p-doping or n-doping to obtain interesting electrochemical properties. 77 The density of states reveal that the individual contribution of each element to the electronic band structure can help to understand the formation band structure and provide reference to band modulation.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

First-Principles Calculations to Investigate Direct-Band Novel Cobalt-Based Double Perovskite Materials for Optoelectronic Applications

Tang

2022

Energy Fuels

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A series of novel cobalt-based perovskite materials have been studied through density functional theory first-principles calculation. The cubic perovskite structure stability is demonstrated by tolerance factors and Born−Huang stability criteria in mechanics as well as formation energies in thermodynamics. The elastic constant analysis indicates that the fluoride perovskites are ductile and ionic compounds while the chloride perovskites are brittle and covalent. All the perovskites are direct semiconductors with band gaps as 1.644, 0.455, 2.136, and 0.683 eV for K 2 InCoF 6 , K 2 InCoCl 6 , Rb 2 InCoF 6 , and Rb 2 InCoCl 6 , respectively. The absorption coefficient reveals all the materials still have broad absorption spectra compared with solar AM1.5 irradiance despite photon unavailability in the small wavelength range. Taking into account other physical properties, these perovskites still exhibit great potential and deserve further experimental research. Due to a proper band gap value and high light absorption, K 2 InCoF 6 is considered as the best candidate for solar materials.

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“…However, pristine SnS frequently suffers from low charge separation efficiency and trapping of charge carriers, which seriously affect the practical application of photocatalysis. Many efforts have been made to avoid these issues by combining SnS with other nanomaterials to form heterostructures. − Hence, in order to achieve efficient performance of devices, the coupling of p-type 1D SnS NRs with n-type 0D CdS QDs has evolved much interest in the field of photovoltaics as the depletion layer at the p–n interfacial region induces an electric field which results in improved separation ability and transport of charge carriers. CdS is a wide band gap semiconductor with high electronic mobility and excellent thermal stability, exhibiting sharp excitonic peaks and photoluminescence (PL). − SnS NRs in a heterojunction with CdS QDs can achieve excellent device performance.…”

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confidence: 99%

Ultrafast Hole Migration at the p–n Heterojunction of One-Dimensional SnS Nanorods and Zero-Dimensional CdS Quantum Dots

Kaur,

Goswami,

Babu

et al. 2023

J. Phys. Chem. Lett.

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The p−n heterojunctions fabricated from one-dimensional (1D) p-type tin sulfide nanorods (SnS NRs) decorated with n-type zero-dimensional (0D) cadmium sulfide quantum dots (CdS QDs) have gained significant research attention in energy storage devices. Herein, we have successfully synthesized a 1D/0D SnS@CdS heterostructure (HS) using a hot injection method. Structural and morphological studies clearly suggest that CdS QDs are uniformly anchored on the surface of SnS NRs, resulting in intimate contact between two components. The photoluminescence (PL) study revealed the transfer of photoexcited holes from CdS QDs to SnS NRs, which was further confirmed by transient absorption (TA) studies. TA measurements demonstrate the hole transfer from the valence band of CdS QDs to SnS NRs and delocalization of electrons between the conduction band of SnS NRs and CdS QDs in SnS@CdS HS, resulting in efficient charge separation across the p−n heterojunction. These findings will open up a new paradigm for improving the efficiency of optoelectronic devices.

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Synthesis of CdS–SnS photocatalyst by chemical co-precipitation for photocatalytic degradation of methylene blue and rhodamine B under irradiation by visible light

Cited by 29 publications

References 80 publications

Degradation of Pollutants and Photocatalytic H₂ Evolution Using Carbon Nanotube/Ag Nanoparticle-Modified BaTiO₃ Nanoparticles

Degradation of Pollutants and Photocatalytic H₂ Evolution Using Carbon Nanotube/Ag Nanoparticle-Modified BaTiO₃ Nanoparticles

First-Principles Calculations to Investigate Direct-Band Novel Cobalt-Based Double Perovskite Materials for Optoelectronic Applications

Ultrafast Hole Migration at the p–n Heterojunction of One-Dimensional SnS Nanorods and Zero-Dimensional CdS Quantum Dots

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Synthesis of CdS–SnS photocatalyst by chemical co-precipitation for photocatalytic degradation of methylene blue and rhodamine B under irradiation by visible light

Cited by 29 publications

References 80 publications

Degradation of Pollutants and Photocatalytic H2 Evolution Using Carbon Nanotube/Ag Nanoparticle-Modified BaTiO3 Nanoparticles

Degradation of Pollutants and Photocatalytic H2 Evolution Using Carbon Nanotube/Ag Nanoparticle-Modified BaTiO3 Nanoparticles

First-Principles Calculations to Investigate Direct-Band Novel Cobalt-Based Double Perovskite Materials for Optoelectronic Applications

Ultrafast Hole Migration at the p–n Heterojunction of One-Dimensional SnS Nanorods and Zero-Dimensional CdS Quantum Dots

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Product

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Degradation of Pollutants and Photocatalytic H₂ Evolution Using Carbon Nanotube/Ag Nanoparticle-Modified BaTiO₃ Nanoparticles

Degradation of Pollutants and Photocatalytic H₂ Evolution Using Carbon Nanotube/Ag Nanoparticle-Modified BaTiO₃ Nanoparticles