The photocatalytic phenol degradation mechanism of Ag-modified ZnO nanorods

Feng, Chang; Chen, Zhuoyuan; Jing, Jiangping; Hou, Jian

doi:10.1039/c9tc05010h

Cited by 153 publications

(65 citation statements)

References 43 publications

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“…The photocatalytic degradation efficiency is 95% for the TiO 2 nanotubes and 55% for the ZnO nanotubes, respectively. The degradation efficiency values of the nanotubes are consistent with data previously reported in the literature for ZnO and TiO 2 nanostructures [ 28 , 37 , 45 , 46 , 47 ].…”

Section: Resultssupporting

confidence: 90%

“…They can be easily prepared in different morphologies (nanowires, nanofibers, nanoflowers, nanotubes, nanorods, etc.) by various facile and low-cost methods [ 8 , 10 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ], making them adequate for a broad range of applications, such as photovoltaics [ 26 ], electronic devices [ 27 ], photocatalysis [ 28 ], water purification [ 29 ], dye-sensitized solar cells [ 30 ], sensors [ 31 ], and renewable energy [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of ZnO and TiO2 Nanotubes via Flexible Electro-Spun Nanofibers for Photocatalytic Applications

et al. 2021

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Web-like architectures of ZnO and TiO2 nanotubes were fabricated based on a three-step process of templating polymer nanofibers produced by electrospinning (step 1). The electrospun polymer nanofibers were covered by radio-frequency magnetron sputtering with thin layers of semiconducting materials (step 2), with FESEM observations proving uniform deposits over their entire surface. ZnO or TiO2 nanotubes were obtained by subsequent calcination (step 3). XRD measurements proved that the nanotubes were of a single crystalline phase (wurtzite for ZnO and anatase for TiO2) and that no other crystalline phases appeared. No other elements were present in the composition of the nanotubes, confirmed by EDX measurements. Reflectance spectra and Tauc plots of Kubelka–Munk functions revealed that the band gaps of the nanotubes were lower than those of the bulk materials (3.05 eV for ZnO and 3.16 eV for TiO2). Photocatalytic performances for the degradation of Rhodamine B showed a large degradation efficiency, even for small quantities of nanotubes (0.5 mg/10 mL dye solution): ~55% for ZnO, and ~95% for TiO2.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Fabrication of ZnO and TiO2 Nanotubes via Flexible Electro-Spun Nanofibers for Photocatalytic Applications

et al. 2021

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“…The intermediates formed from 1,4-HQ are mostly short-chain acids, as observed earlier in similar systems [ 24 , 46 , 47 , 48 , 49 ]. Generally, the produced reactive oxygen species attack the phenyl ring of 1,4-HQ, producing dihydroxy derivatives (via • OH reaction) or promoting aromatic ring cleavage (via • O 2 − reaction).…”

Section: Resultssupporting

confidence: 77%

The Photocatalytic and Antibacterial Performance of Nitrogen-Doped TiO2: Surface-Structure Dependence and Silver-Deposition Effect

et al. 2020

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Catalysts for visible-light-driven oxidative cleaning processes and antibacterial applications (also in the dark) were developed. In order to extend the photoactivity of titanium dioxide into the visible region, nitrogen-doped TiO2 catalysts with hollow and non-hollow structures were synthesized by co-precipitation (NT-A) and sol–gel (NT-U) methods, respectively. To increase their photocatalytic and antibacterial efficiencies, various amounts of silver were successfully loaded on the surfaces of these catalysts by using a facile photo-deposition technique. Their physical and chemical properties were evaluated by using scanning electron microscopy (SEM), transmission electron microscopy–energy dispersive X-ray spectroscopy (TEM–EDS), Brunauer–Emmett–Teller (BET) surface area, X-ray diffraction (XRD), and diffuse reflectance spectra (DRS). The photocatalytic performances of the synthesized catalysts were examined in coumarin and 1,4-hydroquinone solutions. The results showed that the hollow structure of NT-A played an important role in obtaining high specific surface area and appreciable photoactivity. In addition, Ag-loading on the surface of non-hollow structured NT-U could double the photocatalytic performance with an optimum Ag concentration of 10−6 mol g−1, while a slight but monotonous decrease was caused in this respect for the hollow surface of NTA upon increasing Ag concentration. Comparing the catalysts with different structures regarding the photocatalytic performance, silverized non-hollow NT-U proved competitive with the hollow NT-A catalyst without Ag-loading for efficient visible-light-driven photocatalytic oxidative degradations. The former one, due to the silver nanoparticles on the catalyst surface, displayed an appreciable antibacterial activity, which was comparable to that of a reference material practically applied for disinfection in polymer coatings.

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“…The electrons get excited to valence band to conduction band. The excited electrons immobilized with phenol dye and resulted in the formation of byproducts CO 2 and H 2 O with reduced phenol . Due to the formation of limited free radicals the phenol dye was degraded very less.…”

Section: Resultsmentioning

confidence: 99%

Green Synthesis of Multifaceted Silver Nanoparticles Using the Flower Extract of Aerva lanata and Evaluation of Its Biological and Environmental Applications

et al. 2020

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The present investigation signifies the examination of bactericidal, cytotoxic and photocatalytic activity of Aerva lanata synthesized silver nanoparticles. Prior to activity, the silver nanoparticles were synthesized by using the flower extract of Aerva lanata. Further, the synthesized silver nanoparticles were characterized by UV-vis spectroscopy, X-ray diffraction analysis (XRD), Scanning electron microscope (SEM), Atomic force microscope (AFM) and Transmission electron microscope (TEM). Among the four test bacteria, the silver nanoparticles show higher bactericidal activity against Klebsiella planticola. The survival percentage of HepG2 cell lines treated with 25, 50, 75 and 100 μg/ml silver nanoparticles was found to be 80. 97, 65.98, 42.75 and 26.12 %, respectively. The photocatalytic dye degradation effect of synthesized silver nanoparticles was achieved of about 49.26 % and 35 % against methylene blue (MB) and phenol, respectively. The cytotoxic, bactericidal and photocatalytic activities of non-toxic flower extract synthesized silver nanoparticles have promising applications in modern medicine.[a] Dr.

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The photocatalytic phenol degradation mechanism of Ag-modified ZnO nanorods

Abstract: ZnO/Ag/Ag2O accelerates phenol degradation through different intermediate processes under white light illumination.

Cited by 153 publications

References 43 publications

Fabrication of ZnO and TiO2 Nanotubes via Flexible Electro-Spun Nanofibers for Photocatalytic Applications

Fabrication of ZnO and TiO2 Nanotubes via Flexible Electro-Spun Nanofibers for Photocatalytic Applications

The Photocatalytic and Antibacterial Performance of Nitrogen-Doped TiO2: Surface-Structure Dependence and Silver-Deposition Effect

Green Synthesis of Multifaceted Silver Nanoparticles Using the Flower Extract of Aerva lanata and Evaluation of Its Biological and Environmental Applications

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