Hydrothermal Preparation of Silver Doping Zinc Oxide Nanoparticles: Studys, Characterization and Photocatalytic Activity

In this study , we report the prepared of ZnO nanoparticles and Ag doped ZnO nanostructure via a hydrothermal process. The obtained nanostructures were characterized using different characterization techniques such as X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) , atomic force microscopy (AFM) ,Fourier transform infrared spectrometry (FTIR)and UV/Visible spectrophotometer.The XRD results showed the wurtzite hexagonal structure of the ZnO Nanoparticles. Furthermore, the morphology of ZnO and Ag-ZnO nanostructures was obtained from SEM and AFM. The photocatalytic degradation of Cibacron Brilliant Yellow 3G-P (CB) dye was studied in presence of visible light using Ag-ZnO nanostructures as a photocatalyst. There are numerous factors which has an effect on the efficiency color removal of this process. Hence a study was conducted on the effect of several parameters on Ag-ZnO like amount of catalyst, CB dye concentration and pH of solution. Results showed Ag doping ZnO with 3% loading shows photocatalytic removal about 65% after 120 min which influenced superior photocatalytic activity than pure ZnO.

Download Full-text

A comparative study on the VOCs sensing behaviors of various ZnO nanostructures

Vietnam Journal of Catalysis and Adsorption ◽

10.51316/jca.2020.080 ◽

2020 ◽

Vol 9 (4) ◽

pp. 117-122

Author(s):

Vuong Nguyen Minh ◽

Dung Dinh Tien ◽

Hieu Hoang Nhat ◽

Nghia Nguyen Van ◽

Truong Nguyen Ngoc Khoa ◽

...

Keyword(s):

Electron Microscopy ◽

Hierarchical Structure ◽

Hydrothermal Process ◽

Zno Nanostructures ◽

X Ray Diffraction ◽

Wet Chemical Method ◽

Electrospinning Technique ◽

Transmission Electron ◽

Volatile Organic ◽

Wet Chemical

The volatile organic compounds (VOCs) sensing layers were studied using ZnO nanomaterials with different morphologies including hierarchical nanostructure (ZnO-H), nanorods (ZnO-NRs), commercial nanoparticles (ZnO-CNPs) and wet chemical synthesized nanoparticles (ZnO-HNPs). ZnO hierarchical structure was fabricated by an electrospinning technique followed by hydrothermal process. ZnO vertical nanorods structure was fabricated by hydrothermal method, while ZnO nanoparticles based sensors were prepared from commercial powder and wet chemical method. The morphology and properties of the fabricated samples were examined by scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). VOCs sensing responses toward acetone, ethanol and methanol with respect to altered ZnO nanostructureswas systematically compared at different working temperatures. The enhanced response at low working temperatures induced by theopen space hierarchical structure was observed. The VOCs sensing mechanisms of the ZnO nanostructures based sensing layer were also explained and discussed in detail.

Download Full-text

Electrical behavior and enhanced photocatalytic activity of (Ag, Ni) co-doped ZnO nanoparticles synthesized from co-precipitation technique

Water Science & Technology ◽

10.2166/wst.2020.230 ◽

2020 ◽

Vol 81 (6) ◽

pp. 1296-1307

Author(s):

R. Jeyachitra ◽

S. Kalpana ◽

T. S. Senthil ◽

Misook Kang

Keyword(s):

Electron Microscopy ◽

Photocatalytic Activity ◽

Zno Nanoparticles ◽

Uv Light ◽

Light Exposure ◽

Precipitation Method ◽

Zno Nps ◽

Transmission Electron ◽

Doped Zno ◽

Co Precipitation

Abstract Methylene blue (MB) dye is the most common harmful, toxic, and non-biodegradable effluent produced by the textile industries. The present study investigates the effect of zinc oxide (ZnO) nanoparticles (NPs) and Ag–Ni doped ZnO NPs on the performance of photocatalytic degradation of MB dye. Pure ZnO and Ag–Ni doped ZnO NPs are synthesized using the co-precipitation method. The crystalline nature and surface morphology of the synthesized pure ZnO and Ag–Ni doped ZnO NPs was characterized by powder X-ray diffraction, scanning electron microscopy (SEM), and high resolution transmission electron microscopy (HRTEM) analysis. The presence of spherical-like morphologies was confirmed from SEM and HRTEM analysis. The presence of Ni–O and Zn–O bands in the synthesized materials was found by Fourier transform infrared (FTIR) spectroscopy analysis. The MB dye was degraded under UV-light exposure in various pH conditions. The Ag (0.02%)–Ni doped ZnO NPs exhibits highest photocatalytic activity of 77% under pH 4.

Download Full-text

Improved visible-light photocatalytic activity of sodium tantalum oxide via biomass-derived silk fibroin doping

Textile Research Journal ◽

10.1177/0040517518770677 ◽

2018 ◽

Vol 89 (7) ◽

pp. 1332-1339

Author(s):

Yehua Sun ◽

Yuzhuo Luo ◽

Yaofeng Zhu ◽

Yaqin Fu

Keyword(s):

Electron Microscopy ◽

Photocatalytic Activity ◽

Visible Light ◽

Silk Fibroin ◽

Photoelectron Spectroscopy ◽

Structural Changes ◽

Diffuse Reflectance Spectroscopy ◽

Hydrothermal Process ◽

X Ray ◽

Transmission Electron

Biomass-derived silk fibroin (SF)-doped NaTaO3 catalysts were successfully synthesized by a simple hydrothermal process using SF as the dopant. The as-prepared samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS) analyses. The samples were tested as photocatalysts in the degradation of methylene blue under UV and visible light. XRD results showed the monoclinic structure of NaTaO3 lacking significant structural changes after anion doping. SEM and TEM images revealed the nanocubic morphology of the samples, the crystal particle sizes of which were about 100–300 nm. The XPS spectrum showed the peak of Ta4p3&N1s, indicating the combination of N and Ta. The UV-vis DRS results of the samples revealed a cut-off edge that red shifted from 315 nm of the pure NaTaO3 to 324 nm of the SF-doped counterpart. SF doping helped narrow the band gap and rendered the prepared sample sensitive to visible light. Under UV and visible-light irradiation, SF-doped NaTaO3 exhibited higher photocatalytic activity than that the undoped compound. SF-doped NaTaO3 samples also exhibited excellent stability during the recycling photocatalytic process.

Download Full-text

A novel synthetic method for nanosized crystalline titania for use in the decomposition of dyes

Water Science & Technology ◽

10.2166/wst.2004.0255 ◽

2004 ◽

Vol 49 (4) ◽

pp. 177-181 ◽

Cited By ~ 4

Author(s):

C.Y. Yun ◽

J. Moon ◽

K. Chung ◽

M. Kang ◽

C.B. Shin ◽

...

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Photocatalytic Activity ◽

Hydrothermal Process ◽

Synthetic Method ◽

X Ray Diffraction ◽

X Ray ◽

Nanocrystalline Titania ◽

Transmission Electron ◽

Bet Method

Photocatalytically active nanocrystalline titania particles were prepared using a hydrothermal process, by controlling the particle size and crystallinity. The crystalline structures and morphologies of the particles were characterized by X-ray diffraction and transmission electron microscopy. The BET method was used to determine the surface area and verify the grain size. To estimate the photocatalytic activity of the synthesized particles, a dye photodegradation experiment was carried out and the activity of the particles was compared with that of conventional titania. The results show that synthesized nanocrystalline titania particles had a higher photocatalytic activity than that of conventional titania. These findings provide a basis for the preparation of more effective and useful materials for use in AOP applications.

Download Full-text

Temperature Induced Morphology Transformation of ZnO under Hydrothermal Condition

Materials Science Forum ◽

10.4028/www.scientific.net/msf.694.559 ◽

2011 ◽

Vol 694 ◽

pp. 559-564

Author(s):

Yan Wei Li ◽

Guang Sun ◽

Jian Liang Cao ◽

Hari Bala ◽

Yan Wang ◽

...

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Zno Nanoparticles ◽

Hydrothermal Condition ◽

Zno Nanostructures ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

High Resolution Tem ◽

Scanning Electron

ZnO nanostructures with different morphology were successfully prepared via a hexamethylendiamine-assisted hydrothermal synthesis route by only adjusting reaction temperature. The prepared ZnO samples were characterized by powder X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and high resolution TEM (HRTEM). Results indicated that uniform flake-like ZnO nanoparticles with a similar thickness of about 70 nm and flower-like ZnO nanostructures assembled by prism-like nanorods were prepared at 120 °C and 180 °C, respectively. Possible mechanisms for the formation of ZnO with different morphologies were discussed. The photocatalytic properties of the as-prepared flake-like ZnO nanoparticles and flower-like ZnO nanostructures were studied.

Download Full-text

Effects of Annealing Treatment on Structural, Optical and Morphology Characteristics of ZnO Nanostructures

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.626.967 ◽

2012 ◽

Vol 626 ◽

pp. 967-970 ◽

Cited By ~ 1

Author(s):

Siti Khadijah Mohd Bakhori ◽

Chuo Ann Ling ◽

Shahrom Mahmud

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Annealing Treatment ◽

Near Band Edge ◽

Band Edge Emission ◽

Zno Nanostructures ◽

Zno Nanostructure ◽

Band Emission ◽

Transmission Electron ◽

Xrd Patterns

The ZnO nanostructure produced by CFCO or French process were undergone annealing treatment at 700°C in oxygen and nitrogen ambient. Subsequently, the characteristics of structural, optical and morphology of ZnO nanostructures were investigated using X-ray diffraction (XRD), photoluminescence (PL) and transmission electron microscopy (TEM) respectively. The crystallite size of the nanostructures were calculated from full width half maximum (FWHM) of (101) peak in XRD patterns and the size is around 42 nm. PL measuremment were carried out and the near band edge emission (NBE) is increase in wavelength or namely redshifted. Moreover, deep band emission (DBE) is observed at 520 nm for ZnO annealed in nitrogen, which commonly regarded as the defect level of oxygen vacancies. The investigation continues with conducting transmission electron microscopy (TEM) to demonstrate the mophology of as grown nanostructures and annealed in both nitrogen and oxygen ambient.

Download Full-text

Ultrasonic-Assisted Synthesis, Characterization, and Optical Properties of Sb Doped ZnO and Their Photocatalytic Activities

Journal of Nanomaterials ◽

10.1155/2014/725817 ◽

2014 ◽

Vol 2014 ◽

pp. 1-10 ◽

Cited By ~ 5

Author(s):

Anukorn Phuruangrat ◽

Waipawan Kongpet ◽

Oranuch Yayapao ◽

Budsabong Kuntalue ◽

Somchai Thongtem ◽

...

Keyword(s):

Electron Microscopy ◽

Photocatalytic Activity ◽

Uv Light ◽

Blue Shift ◽

Zno Nanostructures ◽

Absorption Bands ◽

X Ray ◽

Transmission Electron ◽

Ultrasonic Assisted ◽

Doped Zno

Sb doped ZnO nanostructures were synthesized by an ultrasonic-assisted method. Effect of Sb dopant on the structure, morphology, and composition of as-synthesized Sb doped ZnO nanostructures was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy, and transmission electron microscopy (TEM). All samples were identified to wurtzite hexagonal ZnO structure. UV-visible spectra of the as-synthesized 3% Sb doped ZnO sample exhibit broad absorption bands at around 343 nm which is blue shift of 373 nm of pure ZnO. The photocatalytic activity was tested by decolorization of methylene blue (MB) solution under UV light. After 300 min irradiation, the degradation efficiencies were 56, 90, and 95% for ZnO, 1% Sb doped ZnO, and 3% Sb doped ZnO, respectively. The 3% Sb doped ZnO shows the highest photocatalytic activity than any other samples.

Download Full-text

Few-Layered MoS2 Nanostructures for Highly Efficient Visible Light Photocatalysis

NANO ◽

10.1142/s1793292016501149 ◽

2016 ◽

Vol 11 (10) ◽

pp. 1650114 ◽

Cited By ~ 5

Author(s):

Dan Li ◽

Jianwei Li ◽

Caiqin Han ◽

Xinsheng Zhao ◽

Haipeng Chu ◽

...

Keyword(s):

Electron Microscopy ◽

Photocatalytic Activity ◽

Visible Light ◽

Electrochemical Impedance ◽

X Ray Diffraction ◽

Electron Hole ◽

Electrochemical Impedance Spectra ◽

X Ray ◽

Transmission Electron ◽

Electron Hole Pair

Few-layered MoS2 nanostructures were successfully synthesized by a simple hydrothermal method without the addition of any catalysts or surfactants. Their morphology, structure and photocatalytic activity were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, electrochemical impedance spectra and UV-Vis absorption spectroscopy, respectively. These results show that the MoS2 nanostructures synthesized at 180[Formula: see text]C exhibit an optimal visible light photocatalytic activity (99%) in the degradation of Rhodamine B owing to the relatively easier adsorption of pollutants, higher visible light absorption and lower electron–hole pair recombination.

Download Full-text

In Situ Growth of ZnO Nanostructures on Cotton Fabric by Solochemical Process for Antibacterial Purposes

Journal of Nanomaterials ◽

10.1155/2018/9082191 ◽

2018 ◽

Vol 2018 ◽

pp. 1-9 ◽

Cited By ~ 4

Author(s):

D. A. R. Souza ◽

M. Gusatti ◽

R. Z. Ternus ◽

M. A. Fiori ◽

H. G. Riella

Keyword(s):

Electron Microscopy ◽

Cotton Fabric ◽

Zinc Nitrate ◽

Nitrate Hexahydrate ◽

Zno Nanostructures ◽

In Situ Growth ◽

Zinc Oxide Nanostructures ◽

Gram Positive Bacteria ◽

Transmission Electron

A practical and economical method was developed for the production of an antibacterial cotton fabric using zinc oxide nanostructures without the use of surface modifying agents. In this process, zinc nitrate hexahydrate and potassium hydroxide were used as starting materials and the reaction was performed at 50°C. The in situ growth of ZnO nanostructures on cotton fabric occurred in a single-stage process, and it started when the fabric samples were dipped for 1 min in the solution containing all the starting materials. The treated and untreated fabric samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and EDS. The cotton fabrics coated with ZnO nanostructures presented an antibacterial efficiency towards Pseudomonas aeruginosa, a gram-negative bacteria, and Staphylococcus aureus (S. aureus), a gram-positive bacteria.

Download Full-text