Superparamagnetic core/shell Fe 2 O 3 /ZnO nanosheets as photocatalyst cum bactericide

Karunakaran, C.; Vinayagamoorthy, P.

doi:10.1016/j.cattod.2016.11.022

Cited by 31 publications

(16 citation statements)

References 43 publications

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“…found that TiO 2 has photocatalytic bactericidal properties under ultraviolet light irradiation . Photocatalytic sterilization technology has shown attractive application prospects in the fields of public health and water purification . When semiconductors are irradiation by solar light, photogenerated electrons and holes are produced.…”

Section: Energy and Environment Applicationsmentioning

confidence: 99%

Ultrathin Two‐Dimensional Semiconductors for Photocatalysis in Energy and Environment Applications

Zhu

2019

ChemCatChem

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The search for highly active photocatalysts remains one of the most challenging tasks for realizing efficient solar energy utilization. Inspired by their unique and excellent physicochemical properties, ultrathin two-dimensional (2D) semiconductors present great advantages in photocatalytic researches. In this review, we summarize the state-of-art progress on the ultrathin 2D semiconductors with a particular emphasis on their recent advances in energy and environment applications. First, we introduce the historical developments of 2D nanomaterials, and outline their advantages in terms of photocatalysis. Second, the classifications of ultrathin 2D semiconductors are summarized based on their structure and compositions. Further, various energy and environment applications including water splitting, CO 2 reduction, N 2 fixation, organic syntheses, NO x removal, water treatment, and sterilization in recent years (mainly in the recent 3 years) are highlighted in detail. Finally, the personal perspectives on future challenges and outlooks in the field of energy and environment applications are featured.[a] Dr.

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Section: Energy and Environment Applicationsmentioning

confidence: 99%

Ultrathin Two‐Dimensional Semiconductors for Photocatalysis in Energy and Environment Applications

Zhu

2019

ChemCatChem

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“…The blue emissions by all the three nanomaterials are almost of equal intensity. Electron‐transfer to the VB from shallow donor level of zinc interstitials as well as from shallow donor level of oxygen vacancies gives rise to blue emission 33–38 . The blue–green emission of nanocrystalline Ni 0.5 Zn 0.5 Fe 2 O 4 /ZnO‐In 2 O 3 (T) and pristine ZnO are almost equally intense but that by Ni 0.5 Zn 0.5 Fe 2 O 4 /ZnO‐In 2 O 3 (A) nanocrystals is marginally low.…”

Section: Resultsmentioning

confidence: 99%

Ni_0.5Zn_0.5Fe₂O₄‐dispersed In₂O₃‐spotted ZnO nanoparticles: Ammonia‐source and surface and photocatalytic properties

Karunakaran

Singh

Vinayagamoorthy

2022

Int J Applied Ceramic Tech

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Ammonia‐source, used to attain the desired pH during synthesis, is conceived to influence the physical characteristics of ZnO‐based nanomaterials, and the catalytic activity is susceptible to surface characteristics of semiconductor–photocatalyst. In this context, Ni0.5Zn0.5Fe2O4‐dispersed In2O3‐spotted ZnO nanoparticles have been obtained by using either tetramethyl ammonium hydroxide or ammonium carbonate as ammonia‐source at identical pH (9) using identical quantities of the precursors following identical synthetic procedure. The nanoparticles have been characterized using energy dispersive X‐ray spectroscopy, elemental mapping, selected area electron and X‐ray diffractometries, transmission electron microscopy, etc. The nanoparticles obtained using ammonium carbonate possess larger (1) pore width, (2) pore volume, and (3) surface area compared with nanoparticles prepared employing tetramethyl ammonium hydroxide. Although the electrical properties of both the samples do not differ remarkably, the violet light‐absorption of the sample prepared using the carbonate is slightly larger than that of the other sample. Further, the In2O3‐spotting is slightly larger on using ammonium carbonate than using tetramethyl ammonium hydroxide. To degrade dye under visible light, the sample obtained using ammonium carbonate shows larger catalytic activity compared with nanoparticles prepared using tetramethyl ammonium hydroxide. The observed photocatalytic activities are explained based on the surface characteristics.

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“…It is known that the intensity of X-rays reflected decreases sharply with increase of the order of diffraction (n), which is determined by the depth of the reflecting crystal plane; more is the depth (from the crystal surface) higher is the 'n' value. The diffraction by deeply buried Fe 3 O 4 core is so weak to be detected [25,26]. Further, it has been shown that the intensity of XRD peaks of Fe 3 O 4 core decreases with increase of the thickness of ZnO shell and the X-ray reflections of Fe 3 O 4 core is completely suppressed by thick ZnO shell [28].…”

Section: Fe 3 O 4 -Implanted Ag 2 S-capped Znomentioning

confidence: 99%

“…The recorded Raman spectrum is characteristic of hexagonal ZnO lattice. The observed Raman frequency at 427 cm −1 corresponds to the E 2 (high) mode representing the vibration of oxygen atom of wurtzite lattice [25,26]. The intensity of E 2 (high) mode reflects the crystallinity of the ZnO lattice and also intrinsic defects stemming from oxygen vacancies (V o ).…”

Section: Fe 3 O 4 -Implanted Ag 2 S-capped Znomentioning

confidence: 99%

“…Although extensive research on semiconductor-photocatalytic mineralization of organic pollutants towards water purification have been made recovery of the particulate photocatalyst after treatment is the bottle neck for adoption of this technology by industries and sewage treatment plants. Magnetic recovery is a solution and for this magnetic core is to be implanted in the particulate photocatalyst [25,26]. The deeply buried magnetic core (iron oxide) is completely and fully wrapped by the photocatalytic semiconductor lattice and is insulated from the semiconductor-effluent interface.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of superparamagnetic biocidal superior solar photocatalytic Fe3O4-implanted Ag2S-capped ZnO micro-clubbells

2019

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Semiconductor-photocatalytic mineralization of organics is an emerging technology. However, recovery of the photocatalytic particles post pollutant-mineralization is a stumbling block for adoption of this technique. Implantation of magnetic core in the particulate photocatalyst ensures magnetic recovery. The magnetic core, deeply buried in the photocatalytic semiconductor lattice, is secluded from the photocatalyst/effluent interface and has insignificant influence on the photocatalytic processes. As the magnetic core is concealed its photocorrosion is overcome. With this, we report synthesis of Fe 3 O 4-implanted Ag 2 S-capped ZnO microstructure by a two-step hydrothermal process. Scanning electron micrograph shows the synthesized particles as micro-clubbell-shaped. The energy dispersive X-ray spectrum confirms the presence of the constituent elements and the elemental mapping images display the even distribution of the constituent elements in the micro-clubbells. The X-ray diffractogram and the Raman spectrum show ZnO in zincite structure and Ag 2 S in acanthite phase. The synthesized microstructure and precursor Fe 3 O 4 nanocrystals are superparamagnetic and their magnetic properties are comparable. The charge-transfer resistance of the microstructure is more than 20-fold that of Fe 3 O 4 nanocrystals (New J Chem 40:1845-1852, 2016). The micro-clubbells absorb in the entire visible region and displays strong absorption in the UV-A region. The microcomposite exhibits green and strong blue-green emissions and the lifetime of photogenerated charge carriers is 10 ps. The synthesized microsized clubbell is mesoporous and its specific surface area is comparable to those of nanostructured composites. The synthesized microcomposite (1) displays superior photocatalytic activity under natural sunlight and (2) is reusable and magnetically recoverable. In addition, the title microstructure exhibits bactericidal activity, even without direct illumination.

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Superparamagnetic core/shell Fe 2 O 3 /ZnO nanosheets as photocatalyst cum bactericide

Cited by 31 publications

References 43 publications

Ultrathin Two‐Dimensional Semiconductors for Photocatalysis in Energy and Environment Applications

Ultrathin Two‐Dimensional Semiconductors for Photocatalysis in Energy and Environment Applications

Ni_0.5Zn_0.5Fe₂O₄‐dispersed In₂O₃‐spotted ZnO nanoparticles: Ammonia‐source and surface and photocatalytic properties

Synthesis of superparamagnetic biocidal superior solar photocatalytic Fe3O4-implanted Ag2S-capped ZnO micro-clubbells

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Superparamagnetic core/shell Fe 2 O 3 /ZnO nanosheets as photocatalyst cum bactericide

Cited by 31 publications

References 43 publications

Ultrathin Two‐Dimensional Semiconductors for Photocatalysis in Energy and Environment Applications

Ultrathin Two‐Dimensional Semiconductors for Photocatalysis in Energy and Environment Applications

Ni0.5Zn0.5Fe2O4‐dispersed In2O3‐spotted ZnO nanoparticles: Ammonia‐source and surface and photocatalytic properties

Synthesis of superparamagnetic biocidal superior solar photocatalytic Fe3O4-implanted Ag2S-capped ZnO micro-clubbells

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Ni_0.5Zn_0.5Fe₂O₄‐dispersed In₂O₃‐spotted ZnO nanoparticles: Ammonia‐source and surface and photocatalytic properties