Synthesis of nanocomposite CdS/TiO2 and investigation of its photocatalytic activity for CO2 reduction to CO and CH4 under visible light irradiation

Beigi, Atefe Ahmad; Fatemi, Shohreh; Salehi, Zeinab

doi:10.1016/j.jcou.2014.06.003

Cited by 107 publications

(26 citation statements)

References 17 publications

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“…This strategy provides means of increasing absorption toward the visible light region, at the same time enhancing the electron-hole pair separation, setting apart the reduction and oxidation sites for an improved performance [40,139]. Examples of narrow bandgap semiconductors that have been coupled with TiO 2 for photocatalytic reduction of CO 2 under visible light irradiation include CdS [140], Bi 2 S 3 [141], CdSe quantum dots (QDs) [142], PbS QDs [143], and AgBr [144]. To enhance the adsorption of CO 2 molecules, materials with high intrinsic basicity, such as cobalt aluminum hydroxide, can be applied as sensitizers of TiO 2 [145].…”

Section: Heterostructuresmentioning

confidence: 99%

Synthesis and Surface Modification of TiO2-Based Photocatalysts for the Conversion of CO2

2020

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Among all greenhouse gases, CO2 is considered the most potent and the largest contributor to global warming. In this review, photocatalysis is presented as a promising technology to address the current global concern of industrial CO2 emissions. Photocatalysis utilizes a semiconductor material under renewable solar energy to reduce CO2 into an array of high-value fuels including methane, methanol, formaldehyde and formic acid. Herein, the kinetic and thermodynamic principles of CO2 photoreduction are thoroughly discussed and the CO2 reduction mechanism and pathways are described. Methods to enhance the adsorption of CO2 on the surface of semiconductors are also presented. Due to its efficient photoactivity, high stability, low cost, and safety, the semiconductor TiO2 is currently being widely investigated for its photocatalytic ability in reducing CO2 when suitably modified. The recent TiO2 synthesis and modification strategies that may be employed to enhance the efficiency of the CO2 photoreduction process are described. These modification techniques, including metal deposition, metal/non-metal doping, carbon-based material loading, semiconductor heterostructures, and dispersion on high surface area supports, aim to improve the light absorption, charge separation, and active surface of TiO2 in addition to increasing product yield and selectivity.

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Section: Heterostructuresmentioning

confidence: 99%

Synthesis and Surface Modification of TiO2-Based Photocatalysts for the Conversion of CO2

2020

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“…Photocatalysis is a potential method to overcome many problems in chemical pollution such as organic waste degradation and dye molecules degradation. TiO 2 is a well-known photocatalyst used either as a single photocatalyst powder, or in a composite form such as TiO 2 /carbon [1], ZnS-CdS/TiO 2 [2], and nano-CdS/TiO 2 [3]. Titanium dioxide (TiO 2 ) or titania is a very well-known and well-researched material due to the stability of its chemical structure, biocompatibility, physical, optical and electrical properties [4].…”

Section: Introductionmentioning

confidence: 99%

The Photocatalytic Activity of Zns-TiO2 on a Carbon Fiber Prepared by Chemical Bath Deposition

2019

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This research prepared a TiO2, ZnS, and ZnS-TiO2 film on a carbon fiber, to produce TiO2/C-fiber, ZnS-C-fiber, and ZnS-TiO2/C-fiber by Chemical Bath Deposition (CBD). Results show that TiO2/C-fiber consist of anatase at 2θ 25.3 o and 54.6 o, rutile at 2θ 43.5 o and a carbon characteristic peak at 2θ of 24.5 o. Meanwhile, the characteristic peaks of ZnS on ZnS-TiO2/C-fiber present at 2θ of 27.91 o and 54.58 o. TiO2/C-fiber has a band gap energy of 3.60 eV, the ZnS/C-fiber of 3.73 eV; when those two catalyst combine, the gap energy is 3.15 eV indicating the interface charge transfer between ZnS-TiO2. Photocatalytic treatment of an isopropanol solution with TiO2/C-fiber as a catalyst and under UV light radiation present results peaks at 222- 224 nm and 265 nm, indicating the electronic transition of acetone. Meanwhile, the isopropanol degradation with ZnS-TiO2/C-fiber produced a new peak at 234-237 nm. The Quantum Yield, QY, of ZnS-TiO2/C-fiber is 6.96 x 10-4, higher than TiO2/C-fiber, i.e., 0.42 x 10-4. It indicates that ZnS provides a significant role in the photocatalytic activity through a red shift of light response and decreasing electron-hole recombination.

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“…Furthermore, similar XRD patterns were obtained for PMOF structures in the previous studies [40,54,55], which can be concluded that the photocatalyst has been successfully synthesized. The crystallite size of prepared Co/PMOF calculated from the XRD spectra with Scherrer equation as follows [56,57]…”

Section: Resultsmentioning

confidence: 99%

High selective photocatalytic CO2 conversion into liquid solar fuel over a cobalt porphyrin-based metal–organic framework

Sadeghi

2021

Photochem Photobiol Sci

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In the present study, porphyrin-based metal-organic framework (Co/PMOF) was synthesized and characterized by different spectra analyses. The photoluminescence properties of porphyrin and Co/PMOF revealed that the photoluminescence of Co/PMOF was quenched compared to the porphyrin, indicating that the lifetime of photo-generated charge carriers in Co/ PMOF is longer than porphyrin. The prepared Co/PMOF was applied as an efficient photocatalyst for CO 2 photoconversion to formate in the presence of triethanolamine (TEOA) as a sacrificial agent under visible-light irradiation. The photoreaction results showed that 23.21 µmol HCOO − was produced over Co/PMOF during the 6 h photocatalytic reaction under visible illumination, showing much better activity than the porphyrin, 4.56 µmol HCOO − . No other products were detected, suggesting that this reaction over Co/PMOF has high selectivity. Co/PMOF reusability and stability were examined through recycling tests and there were no remarkable losses of photoactivity even after three cycles of photoreaction. Moreover, FTIR measurement and UV-Vis spectra demonstrated no notable changes in Co/PMOF structure. As a result, superior photocatalytic behavior of Co/PMOF was implied for CO 2 photoreduction which highlights the great potential of assembly porphyrin and cobalt into MOFs for CO 2 photoreduction.

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Synthesis of nanocomposite CdS/TiO2 and investigation of its photocatalytic activity for CO2 reduction to CO and CH4 under visible light irradiation

Cited by 107 publications

References 17 publications

Synthesis and Surface Modification of TiO2-Based Photocatalysts for the Conversion of CO2

Synthesis and Surface Modification of TiO2-Based Photocatalysts for the Conversion of CO2

The Photocatalytic Activity of Zns-TiO2 on a Carbon Fiber Prepared by Chemical Bath Deposition

High selective photocatalytic CO2 conversion into liquid solar fuel over a cobalt porphyrin-based metal–organic framework

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