Immobilization of palladium nanoparticles on thiol-functionalized multi-walled carbon nanotubes with enhanced photocatalytic activity for the degradation of alizarin red

Veisi, Hojat; Tatli, Somayeh; Haghgoo, Mohammad; Amisama, Abbas; Farahmand, Shohreh; Hemmati, Saba

doi:10.1016/j.poly.2019.03.002

Cited by 6 publications

(4 citation statements)

References 41 publications

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“…It is worth mentioning that the MO-NS photocatalyst is also significantly better than other reported materials for degrading ARS in terms of the degradation efficiency and reuse times. , Furthermore, the preparative method of MO-NS is relatively simple and does not require complex preparation methods such as sol–gel, , hydrothermal, , coprecipitation, ,, or combinations with other compounds to form heterojunctions such as ZnS/CQDs, G-TiO 2 @Fe 3 O 4 , β-SiC/g-C 3 N 4 , etc. A comparison of the degradation properties of ARS by different catalysts is listed in Table S4 in detail.…”

Section: Resultsmentioning

confidence: 99%

“…In detail, the MO-NS performs 62.5% TOC removal in an ARS aqueous solution, which is 2.5 and 1.5 times that of the 350°C(1h)550°C(2h) (25.4%) and 350°C(1h)450°C(2h) (41.3%) samples, indicating that MO-NS has a more effective degradation ability and more organic molecules are mineralized during the degradation It is worth mentioning that the MO-NS photocatalyst is also significantly better than other reported materials for degrading ARS in terms of the degradation efficiency and reuse times. 45,46 Furthermore, the preparative method of MO-NS is relatively simple and does not require complex preparation methods such as sol−gel, 47,48 hydrothermal, 44,49 coprecipitation, 45,50,51 or combinations with other compounds to form heterojunctions such as ZnS/CQDs, 51 G-TiO 2 @Fe 3 O 4 , 45 β-SiC/g-C 3 N 4 , 35 etc. A comparison of the degradation properties of ARS by different catalysts is listed in Table S4 in detail.…”

Section: Optical and Electrochemicalmentioning

confidence: 99%

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Nongraphitic Carbon Nitride Melem Oligomer Nanosheets for Photocatalytic Degradation of Organic Pollutants

Wen

Wang

Hao

et al. 2022

ACS Appl. Nano Mater.

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The 2 nm ultrathin nongraphitic carbon nitride melem oligomer nanosheets (MO-NS) were prepared by the combination of melamine pyrolysis process at low temperature and dimethyl sulfoxide solvation centrifugation. The properties of the prepared MO-NS were determined by X-ray diffraction, Fourier transform infrared, scanning electron microscopy, atomic force microscopy, Brunauer–Emmett–Teller (BET), UV–vis, photoluminescence, electrochemical impedance spectroscopy, transient photocurrent response, and Mott–Schottky technologies. The results reveal that the composition and structure of the MO-NS photocatalyst are significantly different from those of the conventional bulk g-C3N4. The presence of “defects” might enhance the photocatalytic activity of a melem oligomer compared with the traditional bulk g-C3N4. The large BET specific surface area, better light absorption ability, and photogenerated carrier separation efficiency further impoved the photodegradation performance of MO-NS. These all lead to the excellent photodegradation efficiency of MO-NS for alizarin red S (ARS), rhodamine B, methyl orange, hydrochloride tetracycline, aureomycin, and acid fuchsin. MO-NS also has good stability even after 10 repeated degradation uses, and a superoxide radical •O2– is the main active species during photodegradation. This paper provides an idea for the design and construction of nongraphitic carbon nitride materials.

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Section: Resultsmentioning

confidence: 99%

Section: Optical and Electrochemicalmentioning

confidence: 99%

Nongraphitic Carbon Nitride Melem Oligomer Nanosheets for Photocatalytic Degradation of Organic Pollutants

Wen

Wang

Hao

et al. 2022

ACS Appl. Nano Mater.

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“…34 The absorption peaks at 2920 and 2857 cm −1 are characteristic absorption peaks of −CH 2 . 35 The weak absorption peak at 2360 cm −1 can be attributed to the characteristic absorption peak of sulfhydryl (−SH), 36 which indicates that −SH has been successfully modified on CdS nanoparticles. The characteristic absorption peaks at 1389 and 1124 cm −1 correspond to the Cd−S bond.…”

Section: Structure and Characterization Of Catalystsmentioning

confidence: 99%

CdS–SH/TiO₂ Heterojunction Photocatalyst Significantly Improves Selectivity for C–O Bond Breaking in Lignin Models

Xu,

Gao,

et al. 2023

ACS Catal.

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The selective breaking of the Cβ–O bond has great potential for the conversion of lignin into high-value aromatic monomers. In the present work, we designed a CdS–SH/TiO2 heterojunction photocatalyst for the efficient selective breaking of the Cβ–O bond. The surface modification of CdS by –SH promoted close contact between the catalyst and lignin and further promoted the Fermi level matching with TiO2. A type-II heterojunction was constructed by CdS–SH and TiO2 nanosheets to enhance the light absorption range and further increase the separation of photogenerated electron–hole pairs, resulting in high catalytic activity. Finally, 85% phenol and 87% acetophenone yields were obtained under mild light irradiation using 2-phenoxy-1-phenylethanol as the model substrate. Several control experiments, along with DFT calculations, indicate that the reaction pathway is more likely to involve the oxidation of Cα–OH to form CαO initially, followed by the activation of Cβ–O, which is then reduced to further form aromatic monomers. This work achieves the efficient selectivity of lignin depolymerization and provides a reference for the design of heterojunction photocatalysts in the valorization of lignin.

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“…However, these metal NPs can be immobilized onto appropriate supports enhancing their recovery, reusability, durability, catalytic efficiency, and cost effectiveness. Different materials such as graphene oxide, [17][18][19] iron oxide, [20][21][22] titanium dioxide, [23][24][25] zeolites, [26][27][28][29] carbon nanotubes, [30][31][32] polymers, [33][34][35][36] chitosan [37][38][39][40] and cellulose [41][42][43][44] have been used as substrates for the immobilization of Pd NPs.…”

mentioning

confidence: 99%

Catalytic degradation of methyl orange using beta cyclodextrin modified polyvinylidene fluoride mixed matrix membranes imbedded with in‐situ generated palladium nanoparticles

Ndlovu

Malatjie

Donga

et al. 2022

J of Applied Polymer Sci

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Azo dyes effluent can cause severe and chronic effects to living organisms since they are toxic, carcinogenic, and mutagenic. They color water, reduce dissolved oxygen, block light penetration, decrease the rate of photosynthesis and adversely affect the whole aquatic biota. Catalysis is one of the methods used in degrading azo dyes to less harmful species. Catalytic palladium nanoparticles (Pd NPs) are effective in the degradation of azo dyes owing to their large surface area and unique electronic properties. However, they are costly, unstable and easily aggregate; hence, a substrate is necessary to enhance their stability, reusability, durability, catalytic efficiency, and cost effectiveness.Herein, Pd NPs were in-situ synthesized and immobilized in beta cyclodextrin (β-CD) modified polyvinylidene-fluoride (PVDF) membranes. The fabricated membranes were characterized using different techniques. Pd NPs slightly improved the properties and performance of the membranes. A complete catalytic degradation of methyl orange azo dye was carried out within 20 min in the presence of sodium borohydride and the increase in Pd NP content increased the rate of degradation. The membranes were recycled and reused five times with no considerable loss of catalytic performance. Therefore, PVDF/β-CD-Pd membranes proved to be self-cleaning, reusable, and efficient in removal of methyl orange from water.

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Immobilization of palladium nanoparticles on thiol-functionalized multi-walled carbon nanotubes with enhanced photocatalytic activity for the degradation of alizarin red

Cited by 6 publications

References 41 publications

Nongraphitic Carbon Nitride Melem Oligomer Nanosheets for Photocatalytic Degradation of Organic Pollutants

Nongraphitic Carbon Nitride Melem Oligomer Nanosheets for Photocatalytic Degradation of Organic Pollutants

CdS–SH/TiO₂ Heterojunction Photocatalyst Significantly Improves Selectivity for C–O Bond Breaking in Lignin Models

Catalytic degradation of methyl orange using beta cyclodextrin modified polyvinylidene fluoride mixed matrix membranes imbedded with in‐situ generated palladium nanoparticles

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Immobilization of palladium nanoparticles on thiol-functionalized multi-walled carbon nanotubes with enhanced photocatalytic activity for the degradation of alizarin red

Cited by 6 publications

References 41 publications

Nongraphitic Carbon Nitride Melem Oligomer Nanosheets for Photocatalytic Degradation of Organic Pollutants

Nongraphitic Carbon Nitride Melem Oligomer Nanosheets for Photocatalytic Degradation of Organic Pollutants

CdS–SH/TiO2 Heterojunction Photocatalyst Significantly Improves Selectivity for C–O Bond Breaking in Lignin Models

Catalytic degradation of methyl orange using beta cyclodextrin modified polyvinylidene fluoride mixed matrix membranes imbedded with in‐situ generated palladium nanoparticles

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CdS–SH/TiO₂ Heterojunction Photocatalyst Significantly Improves Selectivity for C–O Bond Breaking in Lignin Models