Enhanced Photocatalytic Activity of ZnO–CdS Composite Nanostructures towards the Degradation of Rhodamine B under Solar Light

A simple chemical precipitation route was utilized for the synthesis of ZnO nanoparticles (NPs), CdS NPs and ZnO–CdS nanocomposites (NCs). The synthesized nanostructures were examined for the crystal structure, morphology, optical properties and photodegradation activity of rhodamine B (RhB) dye. The ZnO–CdS NCs showed a mixed phase of hexagonal wurtzite structure for both ZnO NPs and CdS NPs. Pure ZnO NPs and CdS NPs possessed bandgaps of 3.2617 and 2.5261 eV, respectively. On the other hand, the composite nanostructures displayed a more narrow bandgap of 2.9796 eV than pure ZnO NPs. When compared to bare ZnO NPs, the PL intensity of near-band-edge emission at 381 nm was practically suppressed, suggesting a lower rate of photogenerated electron–hole (e−/h+) pairs recombination, resulting in enhanced photocatalytic activity. Under solar light, the composite nanostructures displayed a photodegradation efficiency of 98.16% towards of RhB dye. After four trials, the structural stability of ZnO–CdS NCs was verified.

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Synthesis of one-dimensional WO3–Bi2WO6 heterojunctions with enhanced photocatalytic activity

CrystEngComm ◽

10.1039/c4ce01884b ◽

2015 ◽

Vol 17 (3) ◽

pp. 569-576 ◽

Cited By ~ 70

Author(s):

Yin Peng ◽

Qing-Guo Chen ◽

Dan Wang ◽

Hai-Yan Zhou ◽

An-Wu Xu

Keyword(s):

Photocatalytic Activity ◽

Rhodamine B ◽

Photogenerated Electron ◽

High Photocatalytic Activity ◽

Light Irradiation ◽

Solar Light ◽

Electron Hole ◽

One Dimensional ◽

Effective Separation ◽

Solar Light Irradiation

A one-dimensional WO3–Bi2WO6 photocatalyst exhibits high photocatalytic activity for the degradation of rhodamine B (RhB) under solar light irradiation, which is attributed to the effective separation of photogenerated electron–hole pairs by the staggered band potentials between WO3 and Bi2WO6.

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Investigation of Ti Doping on the Structural, Optical and Magnetic Properties of ZnO Nanoparticles

10.21203/rs.3.rs-171786/v1 ◽

2021 ◽

Author(s):

Raji P ◽

K Balachandra Kumar

Keyword(s):

Hexagonal Wurtzite Structure ◽

Xrd Analysis ◽

Infrared Analysis ◽

Near Band Edge ◽

Band Edge Emission ◽

X Ray Diffraction ◽

Absorption Bands ◽

X Ray ◽

Co Precipitation ◽

Ti Doping

Abstract Ti - doped ZnO (TixZn1-xO x= 0.00, 0.05, 0.10, 0.15) nanoparticles have been synthesized through co - precipitation approach. X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence (PL), UV-Visible spectroscopy, and Vibrating Sample Magnetometer (VSM) have been used to characterize the samples. X-Ray Diffraction (XRD) analysis manifested the hexagonal wurtzite structure. The crystallite size decreased from 37 nm to 29 nm as dopant concentration is increased. Fourier transform infrared analysis showed the absorption bands of ZnO, with few within the intensities. SEM investigation showed the irregular shape and agglomeration of the particles. Ti, Zn, and O composition were determined from EDX analysis and confirmed the purity of the samples.PL spectra showed a near band edge emission and visible emission.Vibrating sample magnetometer (VSM) demonstrated pure and doped samples exhibited ferromagnetism behavior at room temperature.

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Synthesis and Enhanced Solar Light Photocatalytic Activity of a C/N Co-Doped TiO2/Diatomite Composite with Exposed (001) Facets

Australian Journal of Chemistry ◽

10.1071/ch17544 ◽

2018 ◽

Vol 71 (5) ◽

pp. 315 ◽

Cited By ~ 15

Author(s):

Xiongbo Dong ◽

Zhiming Sun ◽

Xiangwei Zhang ◽

Xue Li ◽

Shuilin Zheng

Keyword(s):

Electron Microscopy ◽

Photocatalytic Activity ◽

Photogenerated Electron ◽

Pure Tio2 ◽

Solar Light ◽

Tetrabutyl Titanate ◽

Light Illumination ◽

Doped Tio2 ◽

X Ray ◽

Co Doped

A C/N co-doped TiO2/diatomite composite with exposed (001) facet was prepared through a facile sol–gel method using tetrabutyl titanate as a titanium precursor and hexamethylenetetramine as C/N dopant. The as-prepared photocatalyst composites were characterised by X-ray diffraction (XRD), nitrogen adsorption–desorption isotherms, scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis diffuse reflectance spectra (DRS), photoluminescence spectroscopy (PL), as well as X-ray photoelectron spectroscopy (XPS). The TiO2 nanoparticles were immobilised and uniformly distributed on the surface of diatomite with a smaller grain size compared with pure TiO2. In addition, compared with pure TiO2 and the undoped TiO2/diatomite composite, the photocatalytic activity of the C/N co-doped TiO2/diatomite composite under solar light illumination was obviously enhanced. Results indicate that the introduction of a C/N dopant can effectively promote the growth of the highly active anatase (001) facet of TiO2. On the other hand, the N impurity was doped into the interstitial spaces of the TiO2 lattice, which accelerated the charge transfer and hindered the recombination of photogenerated electron–hole pairs. The results show that the as-prepared composite exhibited promising applications in dye wastewater degradation owing to its outstanding reusability and cost-effectiveness.

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Enhanced Photocatalytic and Antibacterial Performance of ZnO Nanoparticles Prepared by an Efficient Thermolysis Method

Catalysts ◽

10.3390/catal9070608 ◽

2019 ◽

Vol 9 (7) ◽

pp. 608 ◽

Cited By ~ 11

Author(s):

Md. Hanif ◽

Insup Lee ◽

Jeasmin Akter ◽

Md. Islam ◽

Ali Zahid ◽

...

Keyword(s):

Photocatalytic Activity ◽

Zno Nanoparticles ◽

Zinc Acetate Dihydrate ◽

Hexagonal Wurtzite Structure ◽

Thermal Method ◽

X Ray Diffraction ◽

Zno Nps ◽

E Coli ◽

Antibacterial Performance ◽

Short Time

ZnO nanoparticles (ZnO-NPs) were synthesized by a straightforward modified thermal method using only one chemical: zinc acetate dihydrate. The process is environmentally safer than other methods because it does not involve other chemicals or a catalyst, acid, or base source. X-ray diffraction analysis indicated that the ZnO-NPs crystallize in the hexagonal wurtzite structure. The UV–vis absorption spectra revealed a marked redshift, which is critical for enhanced photocatalytic activity. We used methylene blue for photocatalytic activity tests and found an excellent degradation percentage (99.7%) within a short time (80 min). The antibacterial activity of the synthesized ZnO-NPs was tested against Escherichia coli at different concentrations of ZnO-NPs. The analysis revealed that the minimum inhibitory concentration (MIC) of the ZnO-NPs against E. coli was 30–50 μg/mL. Our ZnO-NPs were found to be more effective than previously reported ZnO-NPs synthesized via other methods.

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Synthesis and High Visible Light Photocatalytic Activity of Ternary Brookite-g-C3N4-BiOBr Composite

NANO ◽

10.1142/s1793292020500459 ◽

2020 ◽

Vol 15 (04) ◽

pp. 2050045

Author(s):

Ning Liu ◽

Huidong Xie ◽

Jie Li ◽

Yajuan Zhao ◽

Na Wang

Keyword(s):

Photocatalytic Activity ◽

Visible Light ◽

Rhodamine B ◽

Separation Efficiency ◽

Photogenerated Electron ◽

Photocurrent Density ◽

Electron Hole ◽

Degradation Ratio ◽

Loading Amount ◽

Visible Light Photocatalytic

Brookite TiO2 was synthesized by a hydrothermal method, g-C3N4 was prepared by a pyrolytic method, brookite/g-C3N4 composites were prepared by a calcining method, and brookite/g-C3N4/BiOBr ternary composites were prepared by loading BiOBr on the surface of brookite/g-C3N4. XRD and XPS analysis of the composites confirmed the formation of brookite TiO2/g-C3N4/BiOBr. SEM and TEM results confirmed the as-prepared composites were nanosized. The optimum loading amount of BiOBr was 30%. The photocatalytic results showed that the brookite/g-C3N4/30%BiOBr composites degraded rhodamine B completely under visible light irradiation. The degradation ratio of brookite/g-C3N4/30%BiOBr toward rhodamine B was nearly 100% for 2[Formula: see text]h, which was much higher than that of brookite TiO2 and brookite/g-C3N4 catalysts. The reason for the improvement of photocatalytic activity might be because the composites promoted the formation of superoxide radicals and the separation efficiency of photogenerated electron-hole pairs. The photocurrent density of the brookite/g-C3N4/30%BiOBr was about 10 times higher than that of pure brookite. In addition, the brookite/g-C3N4/BiOBr showed a good repeatablity of photocatalysis.

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Photocatalytic Activity of ZnO Nanoparticles on the Degradation of Organic Dyes Under Solar Light

Research Anthology on Synthesis, Characterization, and Applications of Nanomaterials ◽

10.4018/978-1-7998-8591-7.ch023 ◽

2021 ◽

pp. 514-536

Author(s):

Sivakumar Krishnamoorthy ◽

Dharani M.

Keyword(s):

Methylene Blue ◽

Photocatalytic Activity ◽

Organic Pollutants ◽

Rhodamine B ◽

Zno Nanoparticles ◽

Organic Dyes ◽

Preliminary Investigation ◽

Solar Light ◽

Precipitation Method ◽

Co Precipitation

Zinc oxide (ZnO) nanoparticles prepared using simple co-precipitation method are characterized and photocatalytic activity is tested on the degradation of methylene blue and rhodamine B organic pollutants. Morphological and structural properties of synthesized nanomaterial have been characterized using FESEM, EDAX spectroscopy, and XRD, while UV-visible DRS spectroscopy and photoluminescence have been used to understand their optical properties. The photocatalytic behaviour of synthesized nanoparticles was evaluated on the degradation of methylene blue (MB) and rhodamine B (RhB) organic pollutants under solar light irradiation. The highest degradation was achieved for MB (100%) over RhB (96%). Preliminary investigation shows the effective degradation of organic pollutants by ZnO nanoparticles.

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Synthesis of Mg-doped ZnO NPs via a chemical low-temperature method and investigation of the efficient photocatalytic activity for the degradation of dyes under solar light

Solid State Sciences ◽

10.1016/j.solidstatesciences.2019.106053 ◽

2020 ◽

Vol 99 ◽

pp. 106053 ◽

Cited By ~ 6

Author(s):

Rania E. Adam ◽

Hatim Alnoor ◽

Galia Pozina ◽

Xianjie Liu ◽

Magnus Willander ◽

...

Keyword(s):

Photocatalytic Activity ◽

Low Temperature ◽

Solar Light ◽

Zno Nps ◽

Degradation Of Dyes ◽

Temperature Method ◽

Doped Zno ◽

Mg Doped

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Photocatalytic activity of ZnO nanostructured film grown by activated reactive

MRS Proceedings ◽

10.1557/proc-1217-y03-50 ◽

2009 ◽

Vol 1217 ◽

Author(s):

Yuvaraj Dhayalan ◽

narasimha rao k

Keyword(s):

Photocatalytic Activity ◽

Microstructural Analysis ◽

Cotton Fabrics ◽

Morphological Observation ◽

Metal Catalyst ◽

Near Band Edge ◽

Band Edge Emission ◽

Nanostructured Film ◽

Nanostructured Films ◽

Glass Substrates

AbstractZnO nanostructured films were deposited at room temperature on glass substrates and cotton fabrics by activated reactive evaporation in a single step without using metal catalyst or templates. Morphological observation has shown that the nanostructured film contains seaurchin-like structures, and this seaurchin containing large number of randomly grown ZnO nanoneedles. Microstructural analysis revealed the single crystalline nature of the grown nanoneedles and their growth direction was indentified to be along [0002]. PL spectrum of nanostructured films has shown a relatively weak near-band-edge emission peak at 380 nm, and a significant broad peak at 557 nm due to the oxygen vacancy-related emission. ZnO nanostructured films grown on glass substrates and cotton fabrics have shown good photocatalytic activity against rhodamine B.

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ROOM TEMPERATURE FERROMAGNETISM IN Co-DOPED ZnO NANOPARTICLES: MILLING TIME DEPENDENCE AND ANNEALING EFFECT

International Journal of Nanoscience ◽

10.1142/s0219581x11007697 ◽

2011 ◽

Vol 10 (01n02) ◽

pp. 307-311 ◽

Cited By ~ 3

Author(s):

BAPPADITYA PAL ◽

P. K. GIRI

Keyword(s):

Zno Nanoparticles ◽

Room Temperature ◽

Room Temperature Ferromagnetism ◽

Near Band Edge ◽

Band Edge Emission ◽

Magnetic Impurities ◽

Zno Nps ◽

Small Magnitude ◽

Doped Zno ◽

Co Doped

We report on the occurrence of room temperature ferromagnetism in Co -doped ZnO nanoparticles (NPs). Doping is performed by ball milling of 3 wt% of Co mixed with ZnO nanopowders (commercial) for durations of 2–8 h. X-ray diffraction data and high-resolution transmission electron microscopy (HRTEM) confirm the absence of metallic Co clusters or any other phase different from würtzite-type ZnO . The magnetization (M–H curve) measured at room temperature exhibits the clear ferromagnetic characteristic with saturation magnetization (Ms) and coercive field (Hc) of the order of 3–4 emu/g and 225 Oe, respectively. Post-growth annealing at 250°C results in an increase of Ms by a small magnitude, while annealing at 500°C results in reduction of Ms. UV–visible absorption spectra show small redshift in the absorption peaks in the Co -doped ZnO NPs due to the incorporation of Co atoms in ZnO lattice. Room temperature photoluminescence studies show enhanced near-band-edge emission at 378 nm in the doped NPs as compared to the undoped NPs indicating low density of defects in the doped ZnO crystals. Contribution of intrinsic defects and magnetic impurities in the observed ferromagnetism is discussed.

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