Pb doped ZnO nanoparticles for the sorption of Reactive Black 5 textile azo dye

Abstract In this study, Pb doped ZnO nanoparticles were synthesized by a sol-gel technique for the sorption of Reactive Black 5 (RB5) textile dye in aqueous solution. The ZnO:Pb (2 and 4%) nanoparticles have been characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy and cryogenic nitrogen adsorption method. The average size of the synthesized nanoparticles was less than 100 nm and the surface areas were 18.8 and 20.8 m2/g, respectively for ZnO:Pb 2% and ZnO:Pb 4%. Batch sorption experiments were performed for color removal of RB5 dye at ambient temperature and 30 mg/L dye concentration. The central composite design with response surface methodology was used to study the effect of sorption condition (pH, nanoparticles dose and contact time). The significance of independent variables and their interactions was tested by analysis of variance. The optimum conditions of color removal were pH = 7, 2 g/L dose of nanoparticles and a contact time of 79 min. The color removal performance was 79.4 and 98.1% for ZnO:Pb 2 and 4% respectively. The pseudo-second-order model described well the removal rates while the Langmuir model fitted well the adsorption isotherms.

Download Full-text

Synthesis and Characterization of Nanocrystalline ZnO Doped with Al3+ and Ni2+ by a Sol–Gel Method Coupled with Ultrasound Irradiation

Crystals ◽

10.3390/cryst8110406 ◽

2018 ◽

Vol 8 (11) ◽

pp. 406 ◽

Cited By ~ 9

Author(s):

M. Robles-Águila ◽

J. Luna-López ◽

Álvaro Hernández de la Luz ◽

J. Martínez-Juárez ◽

M. Rabanal

Keyword(s):

Sol Gel ◽

Nitrogen Adsorption ◽

Ultrasound Irradiation ◽

Morphological Properties ◽

Nanocrystalline Powders ◽

Metallic Ions ◽

Gel Method ◽

X Ray ◽

Sol Gel Method ◽

Doped Zno

Zinc oxide is one of the most important semiconducting metal oxides and one of the most promising n-type materials, but its practical use is limited because of both its high thermal conductivity and its low electrical conductivity. Numerous studies have shown that doping with metals in ZnO structures leads to the modification of the band gap energy. In this work, Al-doped ZnO, Ni-doped ZnO, and undoped ZnO nanocrystalline powders were prepared by a sol–gel method coupled with ultrasound irradiation, and the results show the influence of Al3+ and Ni2+ ions in the ZnO network. The doping concentrations in ZnO of 0.99 atom % for ZnO–Al and 0.80 atom % for ZnO–Ni were obtained by X-ray Fluorescence (XRF). X-ray Diffraction (XRD) and Raman Spectroscopy showed a decreased intensity and broadening of main peaks, indicating metallic ions. The crystallite size of the sample was decreased from 24.5 nm (ZnO) to 22.0 nm (ZnO–Al) and 21 nm (ZnO–Ni). The textural and morphological properties were analyzed via Nitrogen Adsorption (BET method) and Field Emission Scanning Electron Microscopy (FESEM).

Download Full-text

SYNTHESIS OF ZnO-Аg NANOPARTICLES BY SOL-GEL METHOD

Contemporary Materials ◽

10.7251/comen1901022j ◽

2019 ◽

Vol 10 (1) ◽

Author(s):

Savka Janković ◽

Dragana Milisavić ◽

Tanja Okolić ◽

Dijana Jelić

Keyword(s):

Zno Nanoparticles ◽

Wide Spectrum ◽

Sol Gel ◽

Synthesis Method ◽

Material Surface ◽

Characterization Methods ◽

Gel Method ◽

X Ray ◽

Sol Gel Method ◽

Doped Zno

Zinc oxide is a highly applicable semiconductor material. Wide applica-tion of this nanomaterial is connected to wide spectrum of energy band gap, high bond en-ergy, great thermal conductivity, but also with its non-toxicity, antibacterial activity, bio-compatibility and biodegradability characteristics. The aim of this paper is synthesis and characterization of silver doped ZnO nanoparticles (ZnO:Ag NP) using sol-gel method. Ob-tained samples of silver doped ZnO nanoparticles were characterized by following tech-niques: Fourier-transform infrared spectroscopy (FTIR), UV/VIS spectrophotometry, X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spec-troscopy (EDX). Efficiency of provided synthesis method was examined by FTIR spectros-copy. XRD determined the purity and crystallinity, and wurtzite structure of synthesized material. Surface morphology and the effect of doping were examined using SEM and EDX characterization methods. Results showed better conductivity after doping ZnO nanoparti-cles with silver. SEM micrographs showed ZnO:Ag NP in the form of nanorods with a par-ticle average size of 6 nm.

Download Full-text

Antibacterial Activity of Ag-Doped TiO2 and Ag-Doped ZnO Nanoparticles

International Journal of Photoenergy ◽

10.1155/2018/5927485 ◽

2018 ◽

Vol 2018 ◽

pp. 1-7 ◽

Cited By ~ 19

Author(s):

Gebretinsae Yeabyo Nigussie ◽

Gebrekidan Mebrahtu Tesfamariam ◽

Berhanu Menasbo Tegegne ◽

Yemane Araya Weldemichel ◽

Tesfakiros Woldu Gebreab ◽

...

Keyword(s):

Antibacterial Activity ◽

Zno Nanoparticles ◽

Pathogenic Bacteria ◽

Anatase Phase ◽

Sol Gel ◽

X Ray Diffraction ◽

Zno Nps ◽

Sem Images ◽

X Ray ◽

Doped Zno

We report in this paper antibacterial activity of Ag-doped TiO2 and Ag-doped ZnO nanoparticles (NPs) under visible light irradiation synthesized by using a sol-gel method. Structural, morphological, and basic optical properties of these samples were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectrum, and UV-Vis reflectance. Room temperature X-ray diffraction analysis revealed that Ag-doped TiO2 has both rutile and anatase phases, but TiO2 NPs only have the anatase phase. In both ZnO and Ag-doped ZnO NPs, the hexagonal wurtzite structure was observed. The morphologies of TiO2 and ZnO were influenced by doping with Ag, as shown from the SEM images. EDX confirms that the samples are composed of Zn, Ti, Ag, and O elements. UV-Vis reflectance results show decreased band gap energy of Ag-doped TiO2 and Ag-doped ZnO NPs in comparison to that of TiO2 and ZnO. Pathogenic bacteria, such as Staphylococcus aureus, Pseudomonas aeruginosa, and Escherichia coli, were used to assess the antibacterial activity of the synthesized materials. The reduction in the viability of all the three bacteria to zero using Ag-doped ZnO occurred at 60 μg/mL of culture, while Ag-doped TiO2 showed zero viability at 80 μg/mL. Doping of Ag on ZnO and TiO2 plays a vital role in the increased antibacterial activity performance.

Download Full-text

Mg and La Co-doped ZnO Nanoparticles Prepared by Sol–gel Method: Synthesis, Characterization and Photocatalytic Activity

Periodica Polytechnica Chemical Engineering ◽

10.3311/ppch.12959 ◽

2019 ◽

Vol 64 (1) ◽

pp. 61-74 ◽

Cited By ~ 7

Author(s):

Behnam Khanizadeh ◽

Morteza Khosravi ◽

Mohammad A. Behnajady ◽

Ali Shamel ◽

Behrouz Vahid

Keyword(s):

Electron Microscopy ◽

Photocatalytic Activity ◽

Zno Nanoparticles ◽

Sol Gel ◽

Bet Surface Area ◽

Gel Method ◽

X Ray ◽

Sol Gel Method ◽

Doped Zno ◽

Co Doped

In this study, La and Mg doped, and co-doped ZnO nanoparticles were prepared using the sol-gel method. The prepared samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy (DRS), and N2 physisorption techniques. The XRD results indicated that the prepared nanoparticles can be well adopted by the hexagonal wurtzite structure crystal and there are no second impurity peaks. Studies of the FESEM, EDX and TEM have shown that the samples have uniform spherical-like morphology with a homogenous distribution. The incorporation of La and Mg into the ZnO lattice had no effect on the morphology of the nanoparticles, but a reduction in the size of the grains (≈ 14 nm to ≈ 7 nm) was observed due to the insertion of these ions. The results of N2 physisorption indicated that there was an increase in BET surface area and pore volume for doped and co-doped samples. The results of DRS showed an increase in band gap energy and a blue shift at the absorption edge for doped and co-doped samples. The photocatalytic activity of the prepared catalysts was evaluated in the removal of RhB under UVA irradiation. The results showed that Mg5%-La5%/ZnO had the highest photoactivity (91.18 %) among all samples.

Download Full-text

Investigations on Photocatalytic, Antimicrobial and Magnetic Properties of Sol–Gel-Synthesized Ga-Doped ZnO Nanoparticles

International Journal of Nanoscience ◽

10.1142/s0219581x1850014x ◽

2019 ◽

Vol 18 (01) ◽

pp. 1850014 ◽

Cited By ~ 2

Author(s):

Jaskaran Singh Malhotra ◽

Arnav Sharma ◽

Arun Kumar Singh ◽

Sanjeev Kumar ◽

Bhupendra Singh Rana ◽

...

Keyword(s):

Zno Nanoparticles ◽

Uv Light ◽

Sol Gel ◽

Cost Effective ◽

Hexagonal Wurtzite Structure ◽

Weak Ferromagnetism ◽

Antibacterial Activities ◽

Blue Dye ◽

X Ray ◽

Doped Zno

Gallium (Ga)-doped zinc oxide (ZnO) nanoparticles were synthesized using simple and cost-effective sol–gel method. X-ray powder diffraction studies illustrated the crystalline nature of Ga-doped ZnO nanoparticles with hexagonal wurtzite structure. Fourier-transform infrared spectroscopy and energy dispersive X-ray fluorescence confirmed the Ga[Formula: see text] incorporation in ZnO. The photocatalytic activities of all the synthesized samples were performed on methylene blue dye solution exposed under UV light. The antibacterial activities of the synthesized nanoparticles were investigated against Aeromonas liquefaciens and Shigella flexeneri gram-negative pathogenic strains. The experimental results clearly demonstrated significant enhancement in photocatalytic and antimicrobial activity of ZnO nanoparticles doped with optimum concentration of Ga. Room temperature vibrating sample magnetometer measurements illustrated weak ferromagnetism in all the Ga-doped ZnO samples.

Download Full-text

Preparation and Characterization of a Calcium Carbonate Aerogel

Research Letters in Materials Science ◽

10.1155/2009/138476 ◽

2009 ◽

Vol 2009 ◽

pp. 1-3 ◽

Cited By ~ 4

Author(s):

Johann Plank ◽

Heinz Hoffmann ◽

Joachim Schölkopf ◽

Wolfgang Seidl ◽

Ingo Zeitler ◽

...

Keyword(s):

Carbon Dioxide ◽

Calcium Carbonate ◽

Sol Gel ◽

Nitrogen Adsorption ◽

Average Diameter ◽

Supercritical Drying ◽

Adsorption Method ◽

X Ray ◽

Sol Gel Process

We report on a facile method for the preparation of a calcium carbonate aerogel consisting of aggregated secondary vaterite particles with an approximate average diameter of 50 nm. It was synthesized via a sol-gel process by reacting calcium oxide with carbon dioxide in methanol and subsequent supercritical drying of the alcogel with carbon dioxide. The resulting monolith was opaque, brittle and had overall dimensions of cm. It was characterized by X-ray powder diffraction, nitrogen adsorption method (BET), and scanning electron microscopy.

Download Full-text

Effects of aluminum (Al) incorporation on structural, optical and thermal properties of ZnO nanoparticles

Materials Science-Poland ◽

10.1515/msp-2018-0018 ◽

2018 ◽

Vol 36 (3) ◽

pp. 419-426

Author(s):

Nashiruddin Ahammed ◽

Md Samim Hassan ◽

Mehedi Hassan

Keyword(s):

Thermal Properties ◽

Electron Microscope ◽

Zno Nanoparticles ◽

Sol Gel ◽

Scanning Calorimetry ◽

X Ray ◽

Transmission Electron ◽

Vis Spectroscopy ◽

Ft Ir ◽

Doped Zno

AbstractIn this research article, pure and 1 %, 3 % and 5 % aluminium doped zinc oxide nanoparticles (NPs) were prepared via sol-gel method and then calcined at 500 °C. X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared (FT-IR) spectroscopy, UV-Vis spectroscopy, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) techniques were used to investigate the structural, optical and thermal properties of synthesized pure and Al doped ZnO nanoparticles. Energy dispersive X-ray spectroscopy (EDX) analysis revealed high purity of nanoparticles in the synthesized products without any impurity peaks. Mean dimension of the nanoparticles was ~28 nm and they were hexagonal in shape, according to the images analyzed by transmission electron microscope (TEM). The optical absorption spectra of pure and Al doped ZnO samples studied using UV-Vis spectrometry have been presented and we have observed that the band gap increases with increasing Al concentration. In FT-IR spectra, the broad absorption peaks around 485 cm−1 and 670 cm−1 were assigned to Zn–O vibration. Above 450 °C, the TG curve became flat what means there was no weight loss. In the DSC curve it is seen that the transition at 150 °C was highly exothermic because of structural relaxation and on doping the exothermic peaks became shifted to the lower value of temperature. These types of materials are very useful in optoelectronics applications.

Download Full-text

Microstructure and optical properties of Na-doped ZnO system, synthesized by the sol–gel method

Canadian Journal of Chemistry ◽

10.1139/cjc-2018-0270 ◽

2019 ◽

Vol 97 (4) ◽

pp. 254-258 ◽

Cited By ~ 2

Author(s):

Fan Tong ◽

Ye Zhao ◽

Mao-Hua Wang

Keyword(s):

Electron Microscopy ◽

Zno Nanoparticles ◽

Lattice Structure ◽

Sol Gel ◽

Average Crystalline Size ◽

Tem Analysis ◽

Gel Method ◽

X Ray ◽

Sol Gel Method ◽

Doped Zno

Pure and Na-doped ZnO (2 at.%, 5 at.%, and 10 at.%) films are synthesized by sol–gel method and annealed at 500 °C for 4 h. The as-synthesized nanoparticles are characterized by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) with energy dispersive X-ray spectroscopy (EDS). The samples exhibited hexagonal ZnO lattice structure and another Na2O2 phase was detected in the 5 at.% Na-doped ZnO sample. The calculated average crystalline size increases from 42.0 nm to 43.5 nm when Na content increased from 0 to 10 at.%. FESEM and TEM analysis identifies that the average size of the Na-doped ZnO nanoparticles lies in between 50 nm and they appear in spheroid-like or rod-like shaped particles. The transmittance of the sample was above 80% and the results of photocatalytic activity show that Na-doped ZnO nanoparticles exhibit higher photodegradation activity (about 91%) than pure ZnO nanoparticles under UV irradiation.

Download Full-text

Effective photocatalytic degradation of an azo dye over nanosized Ag/AgBr-modified TiO2 loaded on zeolite

Chemical Papers ◽

10.2478/s11696-011-0013-6 ◽

2011 ◽

Vol 65 (3) ◽

Cited By ~ 19

Author(s):

Mohsen Padervand ◽

Mahboubeh Tasviri ◽

Mohammad Gholami

Keyword(s):

Photocatalytic Degradation ◽

Photocatalytic Performance ◽

Catalyst Concentration ◽

Sol Gel ◽

Nitrogen Adsorption ◽

Textile Dye ◽

X Ray Diffraction ◽

X Ray ◽

Adsorption Desorption ◽

Acid Blue

AbstractZeolite-based photocatalysts were prepared by the sol-gel and deposition methods. The photocatalysts were characterised by X-ray diffraction, nitrogen adsorption-desorption isotherms, FTIR spectroscopy, scanning electron microscopy and energy-dispersive X-ray spectrometry. The activity of the prepared photocatalysts was evaluated by the UV-induced degradation of acid blue 92, a textile dye in common use. The effect of various parameters, such as catalyst concentration, initial dye concentration, thiosulphate concentration and pH, on the rate and efficiency of the photocatalytic degradation of acid blue 92 was investigated. The results showed that each parameter influenced the degradation rate and efficiency in a particular way. It was also found that, under optimised conditions, Ag/AgBr/TiO2/zeolite exhibited the highest photocatalytic performance. A comparison of catalytic activity when exposed to visible light under the same conditions showed that the photocatalysts containing AgBr had the highest activity.

Download Full-text

Synthesis of Nanocrystalline-Doped ZnO with Al3+ and Ni2+ by Sol-Gel Method Coupled by Ultrasound Irradiation

10.20944/preprints201808.0366.v1 ◽

2018 ◽

Author(s):

M. J. Robles-Águila ◽

J. A. Luna-López ◽

Álvaro D. Hernández de la Luz ◽

J. Martínez-Juárez ◽

M. E. Rabanal

Keyword(s):

Sol Gel ◽

Nitrogen Adsorption ◽

Ultrasound Irradiation ◽

Band Gap Energy ◽

Nanocrystalline Powders ◽

Gel Method ◽

X Ray ◽

Sol Gel Method ◽

Bet Method ◽

Doped Zno

Zinc oxide is one of the most important semiconductor metal oxides and one of the most promising n-type materials, but its practical use is limited because of both its high thermal conductivity and its low electrical conductivity. Numerous studies have shown that doping with metals in ZnO structures leads to the modification of the band gap energy. In this work, Al-doped ZnO, Ni-doped ZnO, and undoped ZnO nanocrystalline powders were prepared by sol-gel method coupled with ultrasound irradiation. The doping concentration in ZnO was 1.0 at.% of Al and Ni. Influence of Al3+ and Ni2+ ions in the ZnO network are explored in this paper. X-ray Diffraction (XRD), Raman Spectroscopy, Nitrogen Adsorption (BET method), X-Ray Fluorescence (XRF) and Field Emission Scanning Electron Microscopy (FESEM) analyses demonstrated the incorporation of metal ions (aluminum and nickel) into the ZnO wurtzite structure. The crystallite size of the sample was decreased from 24.5 nm (ZnO) to 22.0 nm (ZnO-Al) and 21 nm (ZnO-Ni).

Download Full-text