MoS2 nanosheets supported on carbon hybridized montmorillonite as an efficient heterogeneous catalyst in aqueous phase

Peng, Kang; Wang, Jianwei; Li, Xiaoyu; Wan, Pengfei; Zhang, Hanyi; Bai, Longqi

doi:10.1016/j.clay.2019.105346

“…For direct transition semiconductors the value of 'n' is 1 47 . Since both BiVO 4 and Ag 2 S are direct semiconductors, a plot of (αhv) 2 against hv was made from which the value of E g for BiVO 4 and Ag 2 S were estimated to be 2.36 eV and 0.97 eV respectively (Fig. 3b).…”

Section: Resultsmentioning

confidence: 99%

“…For instance, Soltani et al 29 , prepared BiFeO 3 /BiVO 4 with p-n heterojunction through facile ultrasonic/hydrothermal route and they observed improved charge separation in the composite as shown in the current density of 0.23 mA/cm −2 achieved on BiFeO 3 /BiVO 4 which was three times higher than that of pristine BiVO 4 . Additionally, higher percentage degradation of tetracycline was reported with the application of the prepared BiFeO 4 . The selection of an appropriate p-type semiconductor is a critical step to achieve p-n heterojunction of BiVO 4 with improved performance.…”

mentioning

confidence: 86%

“…When such antibiotics are present in water, they pose serious danger to aquatic organisms and continuous consumption of such water by human can also result in chronic health issues such as the development of strains of bacteria that are resistant to antibiotics 2 . Over the past decades much attention has been directed to developing water treatment methods that are efficient and environmentally friendly since methods based on conventional wastewater treatments often lead to secondary pollutions and incomplete removal of target pollutants in water 3,4 . A recent approach for removing these recalcitrant organics from wastewater is photoelectrocatalytic (PEC) oxidation using suitable semiconducting materials as photoanodes 5,6 .…”

mentioning

confidence: 99%

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Towards visible light driven photoelectrocatalysis for water treatment: Application of a FTO/BiVO4/Ag2S heterojunction anode for the removal of emerging pharmaceutical pollutants

Orimolade

¹

,

Arotiba

²

2020

Sci Rep

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Pharmaceuticals have been classified as emerging water pollutants which are recalcitrant in nature. In the quest to find a suitable technique in removing them from contaminated water, photoelectrocatalytic oxidation method has attracted much attention in recent years. this report examined the feasibility of degrading ciprofloxacin and sulfamethoxazole through photoelectrocatalytic oxidation using fto-BiVo 4 /Ag 2 S with p-n heterojunction as anode. BiVo 4 /Ag 2 S was prepared through electrodeposition and successive ionic layer adsorption/reaction on fto glass. Structural and morphological studies using XRD, SEM, EDS and diffusive reflectance UV-Vis confirmed the successful construction of p-n heterojunction of BiVo 4 /Ag 2 S. electrochemical techniques were used to investigate enhanced charge separation in the binary electrode. the fto-BiVo 4 /Ag 2 S electrode exhibited the highest photocurrent response (1.194 mA/cm −2 ) and longest electron lifetime (0.40 ms) than both pristine BiVo 4 and Ag 2 S electrodes which confirmed the reduction in recombination of charge carriers in the electrode. Upon application of the prepared FTO-BiVO 4 /Ag 2 S in photoelectrocatalytic removal of ciprofloxacin and sulfamethoxazole, percentage removal of 80% and 86% were achieved respectively with a low bias potential of 1.2 V (vs Ag/AgCl) within 120 min. The electrode possesses good stability and reusability. the results obtained revealed BiVo 4 /Ag 2 S as a suitable photoanode for removing recalcitrant pharmaceutical molecules in water. open Scientific RepoRtS | (2020) 10:5348 | https://doi.org/10.1038/s41598-020-62425-w www.nature.com/scientificreports www.nature.com/scientificreports/ Scientific RepoRtS | (2020) 10:5348 | https://doi.org/10.1038/s41598-020-62425-wwww.nature.com/scientificreports www.nature.com/scientificreports/ the BiOI electrode. The electrode was subsequently placed in a furnace at 420 °C for 1 h. Finally, excess V 2 O 5 was washed off from the electrode by soaking it in 1.0 M NaOH solution for 40 min. The resulting BiVO 4 /FTO electrode was thoroughly washed with deionized water and dried at room temperature. In order to obtain BiVO 4 / Ag 2 S electrode, the prepared FTO/BiVO 4 was dipped in a 0.3 M AgNO 3 solution for 10 s and followed by immersion in 0.3 M Na 2 S for 10 s. The cycle was repeated ten times and the obtained electrode was rinsed with deionized water and air dried at room temperature for 24 h. Scientific RepoRtS |(2020) 10:5348 | https://doi.org/10.1038/s41598-020-62425-w www.nature.com/scientificreports www.nature.com/scientificreports/ conclusion A photoanode of BiVO 4 /Ag 2 S with p-n heterojunction was successful prepared through electrodeposition and successive ionic layer adsorption/reaction method on FTO glass. The construction of p-n heterojunction reduced the common problem of rapid recombination of photogenerated electron-hole pairs. This was confirmed through the photocurrent response of BiVO 4 /Ag 2 S (1.194 mA/cm −2 ) which was higher than both pristine BiVO 4 (0.802 mA/cm −2 ) and...

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“…3. The reflection at 1.2 nm is found in the XRD pattern of MMT, which is corresponding to (001) basal spacing of Na-montmorillonite [33]. The XRD pattern of SA exhibits two obvious reflections of stearic acid at 21.5° and 23.8°.…”

Section: Resultsmentioning

confidence: 94%

Graphene Modified Montmorillonite Based Phase Change Material for Thermal Energy Storage with Enhanced Interfacial Thermal Transfer

Peng

¹

,

Wang

²

,

Wan

³

et al. 2020

Preprint

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Thermal energy storage technology plays a crucial role in the thermal management system. Clay based organic phase change material has considerable advantages in the application of thermal energy storage due to low cost and high energy storage capacity. However, the low thermal conductivity of clay, especially poor interfacial thermal transfer, limits its thermal energy storage efficiency. Herein, stearic acid/reduced graphene oxide modified montmorillonite composites (SA/ RGO-MMT) were prepared by the vacuum impregnation of stearic acid into graphene modified montmorillonite matrix, which was obtained via the in situ reduction of graphene oxide on the surface of montmorillonite. Stearic acid is assembled in the porous structures of RGO-MMT with the physical interactions. SA/RGO-MMT possesses high melting enthalpy of 159 J/g, low extent of supercooling of 1.4°C and excellent thermal reliability after 100 thermal cycling. Energy storage and release rates of SA/RGO-MMT were significantly improved due to the enhanced interfacial thermal transfer by graphene. Therefore, SA/RGO-MMT is a promising form-stable phase change material for applications in solar heat storage fields. The strategy in this study highlights the importance of enhancing interfacial thermal transfer for the efficient thermal energy storage materials.

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“…The reflection at 1.2 nm is found in the XRD pattern of MMT, which is corresponding to (001) basal spacing of Namontmorillonite. [25] The XRD pattern of SA exhibits two obvious reflections of stearic acid at 21.5°and 23.8°. The XRD pattern of RGO-MMT is similar with that of MMT, and no obvious reflection is attributed to the RGO.…”

Section: Resultsmentioning

confidence: 99%

Graphene Modified Montmorillonite Based Phase Change Material for Thermal Energy Storage with Enhanced Interfacial Thermal Transfer

Peng

¹

,

Wan

²

,

Wang

³

et al. 2020

Self Cite

View full text Add to dashboard Cite

Thermal energy storage technology plays a crucial role in the thermal management system. Clay based organic phase change material has considerable advantages in the application of thermal energy storage due to low cost and high energy storage capacity. However, the low thermal conductivity of clay, especially poor interfacial thermal transfer, limits its thermal energy storage efficiency. Herein, stearic acid/reduced graphene oxide modified montmorillonite composites (SA/ RGO-MMT) were prepared by the vacuum impregnation of stearic acid into graphene modified montmorillonite matrix, which was obtained via the in situ reduction of graphene oxide on the surface of montmorillonite. Stearic acid is assembled in the porous structures of RGO-MMT with the physical interactions. SA/RGO-MMT possesses high melting enthalpy of 159 J/g, low extent of supercooling of 1.4°C and excellent thermal reliability after 100 thermal cycling. Energy storage and release rates of SA/RGO-MMT were significantly improved due to the enhanced interfacial thermal transfer by graphene. Therefore, SA/RGO-MMT is a promising form-stable phase change material for applications in solar heat storage fields. The strategy in this study highlights the importance of enhancing interfacial thermal transfer for the efficient thermal energy storage materials.

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MoS2 nanosheets supported on carbon hybridized montmorillonite as an efficient heterogeneous catalyst in aqueous phase

Cited by 39 publications

References 26 publications

Towards visible light driven photoelectrocatalysis for water treatment: Application of a FTO/BiVO4/Ag2S heterojunction anode for the removal of emerging pharmaceutical pollutants

Towards visible light driven photoelectrocatalysis for water treatment: Application of a FTO/BiVO4/Ag2S heterojunction anode for the removal of emerging pharmaceutical pollutants

Graphene Modified Montmorillonite Based Phase Change Material for Thermal Energy Storage with Enhanced Interfacial Thermal Transfer

Graphene Modified Montmorillonite Based Phase Change Material for Thermal Energy Storage with Enhanced Interfacial Thermal Transfer

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