scholarly journals Efficient Photocatalytic Degradation of Organic Pollutant in Wastewater by Electrospun Functionally Modified Polyacrylonitrile Nanofibers Membrane Anchoring TiO2 Nanostructured

Membranes ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 785
Author(s):  
Fahad A. AlAbduljabbar ◽  
Sajjad Haider ◽  
Fekri Abdulraqeb Ahmed Ali ◽  
Abdulaziz A. Alghyamah ◽  
Waheed A. Almasry ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Dye Degradation ◽  
Anatase Phase ◽  
Organic Pollutant ◽  
High Surface ◽  
Hysteresis Loops ◽  
Scanning Electron Micrographs ◽  
Tio2 Nps ◽  
X Ray ◽  
Bare Tio2

In this study, polyacrylonitrile (PAN_P) nanofibers (NFs) were fabricated by electrospinning. The PAN_P NFs membrane was functionalized with diethylenetriamine to prepare a functionalized polyacrylonitrile (PAN_F) NFs membrane. TiO2 nanoparticles (NPs) synthesized in the laboratory were anchored to the surface of the PAN_F NFs membrane by electrospray to prepare a TiO2 NPs coated NFs membrane (PAN_Coa). A second TiO2/PAN_P composite membrane (PAN_Co) was prepared by embedding TiO2 NPs into the PAN_P NFs by electrospinning. The membranes were characterized by microscopic, spectroscopic and X-ray techniques. Scanning electron micrographs (SEM) revealed smooth morphologies for PAN_P and PAN_F NFs membranes and a dense cloud of TiO2 NPs on the surface of PAN_Coa NFs membrane. The attenuated total reflectance in the infrared (ATR-IR) proved the addition of the new amine functionality to the chemical structure of PAN. Transmission electron microscope images (TEM) revealed spherical TiO2 NPs with sizes between 18 and 32 nm. X-ray powder diffraction (XRD) patterns and energy dispersive X-ray spectroscopy (EDX) confirmed the existence of the anatase phase of TiO2. Surface profilometry da-ta showed increased surface roughness for the PAN_F and PAN_Coa NFs membranes. The adsorption-desorption isotherms and hysteresis loops for all NFs membranes followed the IV -isotherm and the H3 -hysteresis loop, corresponding to mesoporous and slit pores, respectively. The photocatalytic activities of PAN_Coa and PAN_Co NFs membranes against methyl orange dye degradation were evaluated and compared with those of bare TiO2 NPs.The higher photocatalytic activity of PAN_Coa membrane (92%, 20 ppm) compared to (PAN_Co) NFs membrane (41.64%, 20 ppm) and bare TiO2 (49.60%, 20 ppm) was attributed to the synergy between adsorption, lower band gap, high surface roughness and surface area.

scholarly journals Novel Blue-Wavelength-Blocking Contact Lens with Er3+/TiO2 NPs: Manufacture and Characterization

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2190
Author(s):  
Lina Mohammed Shaker ◽  
Ahmed Alamiery ◽  
Mohd Takriff ◽  
Wan Nor Roslam Wan Isahak
Keyword(s):  
Energy Gap ◽  
Titanium Dioxide Nanoparticles ◽  
Anatase Phase ◽  
High Surface ◽  
High Surface Area ◽  
Visible Spectrum ◽  
Tio2 Nps ◽  
X Ray ◽  
Erbium Ions ◽  
Blue Wavelength

Thermally stable titanium dioxide nanoparticles (TiO2 NPs) doped with erbium ions (Er3+) are characterized by uniformity, low excitation energy, and high surface area. The impregnation methodology was used to enhance the optical properties of TiO2 NPs impregnated with various Er3+ ion contents. The synthesized Er3+/TiO2 samples were characterized by energy dispersive X-ray (EDX), metal mapping, UV–Visible spectrum, field emission scanning electron microscopy (FESEM), and X-ray diffraction (XRD). The Er3+ ions, per our findings, were well-distributed on the TiO2 surface of the anatase phase and there was an insignificant difference in particle size, but there was no change in the particle shapes of the Er3+/TiO2 NPs structure. The maximum band gap degradation occurred with 1.8 wt % of Er3+/TiO2, where the energy gap degraded from 3.13 to 2.63 eV for intrinsic TiO2. The synthesized Er3+/TiO2 samples possess predominantly finely dispersed erbium ion species on the surface. Er3+ ions agglomeration on the surface increased with increasing ions in each sample. We found that 0.6 wt/vol % of Er+3/TiO2 is the best optical coating and produced satisfying results in terms of blocking the transmittance of blue wavelength without reducing the image quality.

Facile Synthesis of Unique Bismuth Vanadate Nano-Knitted Hollow Cage and its Application in Environmental Remediation

2019 ◽  
Vol 74 (3) ◽  
pp. 259-263 ◽  
Author(s):  
M. Shamshi Hassan
Keyword(s):  
Environmental Remediation ◽  
Dye Degradation ◽  
High Surface ◽  
High Surface Area ◽  
Bismuth Vanadate ◽  
Bandgap Energy ◽  
Blue Dye ◽  
X Ray ◽  
Photodegradation Efficiency ◽  
Hollow Nanostructure

AbstractHierarchical bismuth vanadate (BiVO4) nano-knitted hollow cages have been synthesized by simple hydrothermal method and characterized by scanning electron microscopy, x-ray diffraction, energy-dispersive x-ray spectrometer, Fourier transform infrared, UV-Vis, and Raman. The photodegradation efficiency of BiVO4 nanocage for universally used methylene blue dye. The BiVO4 hollow nanostructure demonstrated better photocatalytic competence in dye degradation as compared to the commercial TiO2 powders (P25). The excellent dye degradation can be certified to the high crystallisation of monoclinic BiVO4 and hollow nanostructure, which leads to high surface area and small bandgap energy of 2.44 eV.

scholarly journals Mesoporous CdO/Al2O3 nanocomposite with enhanced optoelectronic properties for visible-light photocatalysis and bactericidal applications

2021 ◽  
Author(s):  
Janani B ◽  
Asad Syed ◽  
Abdallah M. Elgorban ◽  
Ali H. Bahkali ◽  
S. Sudheer Khan
Keyword(s):  
Photoelectron Spectroscopy ◽  
Organic Contaminants ◽  
Dye Degradation ◽  
High Surface ◽  
High Surface Area ◽  
Energy Shift ◽  
Band Gap Energy ◽  
Oh Radicals ◽  
X Ray ◽  
Viable Solution

Abstract Pristine Al2O3 and CdO are known to possess poor photocatalytic activity individually. The formation of CdO/Al2O3 heterojunction was investigated for the enhancement of photocatalytic performance. High resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) has been used to determine the crystalline feature and elemental composition of the NCs respectively. Peaks ascribed to Cd-O and O-Al-O was noted in fourier-transform infrared spectroscopy (FTIR) analysis. The NCs exhibits a high surface area (27.23 m2/g) to their contributing particles which was analysed using BET analyser. The band gap energy of CdO/Al2O3NCs was observed to be 2.95 eV which shows a considerable energy shift from its individual particles, CdO (2.73 eV) and Al2O3 (3.94 eV). The results displayed that the degradation efficiency of the CdO-Al2O3 NCs was enhanced 14 times than pristine Al2O3 and 3.5 times than pristine CdO. The MB dye has showed the half life period of 80 min. TOC analysis of degraded product supported high mineralization of the pollutants. The dye degradation was driven by OH. radicals and the CdO-Al2O3 nanocomposite possessed high reusability which was confirmed by six cycle test. Growth inhibition of E. coli, P. aeruginosa and B. subtilis was attained by exposure to CdO/Al2O3 NCs. The CdO-Al2O3 NCs can be a viable solution for degradation of organic contaminants effectively under natural sun light as well as an efficient antibacterial agent.

scholarly journals Synthesis and Characterization of Nano-TiO2 using Aqueous Extract of Erythrina variegata Leaves

2021 ◽  
Vol 33 (12) ◽  
pp. 3139-3144
Author(s):  
Jayaram Mari Selvi ◽  
Mariappan Murugalakshmi ◽  
Ponnusamy Sami
Keyword(s):  
Tio2 Nanoparticles ◽  
Dye Degradation ◽  
Anatase Phase ◽  
Spectral Studies ◽  
Blue Dye ◽  
Tio2 Sample ◽  
X Ray ◽  
Erythrina Variegata ◽  
Scanning Electron

In present work, the Erythrina variegata leaves extract acts as a reducing agent for the green synthesis of titanium dioxide (TiO2) nanoparticles. The characterization of the extracted TiO2 nanoparticles were confirmed by ultraviolet spectral studies (UV-Vis), Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDAX) and scanning electron microscopy (SEM). The UV-Vis absorption spectrum exhibited maximum absorbance peak at 317.6 nm,w hich supports the formation of TiO2 nanoparticles. The optical band gap energy value has been determined as 2.35 eV. Further characterization by XRD supports the crystallinity and the incidence of peak at 25.28 ºC corresponds to 101 anatase form. The anatase phase TiO2 sample having tetragonal structure with mean crystalline size was found to be 7.91 nm. Scanning electron microscope image supports the shape of the nanoparticles. These nanoparticles are having effective dye degradation ability with various time intervals. The green synthesized TiO2 nanoparticles exhibits interesting photocatalytic efficacy on methylene blue dye under UV irradiation (using multi-lamp photo reactor) and antibacterial activity against pathogenic organisms like Streptococci, Staphylococci, E. coli and Pseudomonas aeruginosa.

Synthesis, structural and magnetic behavior of undoped and Mn-doped anatase TiO2 nanoparticles

2015 ◽  
Vol 29 (05) ◽  
pp. 1550015
Author(s):  
Asif Mahmood ◽  
Shahid M. Ramay ◽  
Yousef S. Al-Zaghayer ◽  
Shahid Atiq ◽  
Murtaza Saleem ◽  
...  
Keyword(s):  
Crystallite Size ◽  
Anatase Phase ◽  
Magnetic Behavior ◽  
Ferromagnetic Behavior ◽  
Scanning Electron Micrographs ◽  
X Ray Diffraction ◽  
Ionic Radii ◽  
X Ray ◽  
Mn Content ◽  
Mn Doped

Ti 1-x Mn x O 2 (x = 0, 0.05) nanoparticles have been synthesized using chemically derived self-propagating combustion reaction method. X-ray diffraction studies demonstrate the formation of anatase phase of TiO 2 belonging to 141/amd space group in both samples without the formation of any impurity phase. The incorporation of 5 at.% Mn content does not produce any changes in crystal structure which reveals the exact substitution of Mn atoms at Ti sites. Some change in lattice parameters and crystallite size is observed in Mn -doped composition, attributed to the difference in ionic radii. The size of grains obtained using scanning electron micrographs shows the consistent trend with the crystallite size evaluated from X-ray diffraction analysis. Energy dispersive X-ray analysis confirms the incorporation of Mn content in TiO 2 structure. Ferromagnetic behavior detected only in Mn -doped TiO 2 composition correspond to the strong Mn  d-shell contribution.

scholarly journals Suitability of the Iraqi natural clay for the preparation of Al-Fe pillared-clays

2018 ◽  
Vol 162 ◽  
pp. 05017
Author(s):  
Faris Al-Ani ◽  
Ghayda Al-Kindi
Keyword(s):  
Batch Reactor ◽  
Organic Pollutant ◽  
High Surface ◽  
Pillared Clay ◽  
Molar Ratio ◽  
Silty Clay ◽  
Air Oxidation ◽  
Operation Condition ◽  
Iron Cation ◽  
X Ray

Some organic pollutant in aqueous wastewater inhabitant biological treatment, catalyst wet air oxidation is a method to treat this waste. Al-Fe pillared Iraqi clays with different Fe content were prepared. Aluminum was mixed with iron in different molar ratio Fe/Al (1:9- 2:8- 3:7- 4-6- 5:5) for each regions. These clays collected from different location in Iraq (Anbar, Erbil, Mosel, Baghdad, and Basra), the results of some properties studied for natural and pillared clay, from X-Ray- Fluorescence (XRF) show that iron cation replaces some Ca in the clay, and from X-Ray Diffraction (XRD) show the Calcite types of Iraqi clays. constructs clusters of active ingredient which dramatically clear on the catalytic surface for all catalyst types show through photos of catalysts by Scanning Electron Microscopy (SEM), the best molar ratio of Fe/Al in which give strong interaction between Fe and Al in the pillared were (0.5-0.4-0.3-0.3 and 0.2) for (Mosul-Basra -Anbar-Baghdad and Erbil) respectively. This ratio gives high surface area, and pore size in mesopore. It is concluded that clay and silty clay (Mosul clay) consider the best catalyst due to higher activity and stability through experiment of CWAO in batch reactor, with operation condition 150°C, 2.5 Mpa, Ccat equal to 7 mg/l.

The influence of surface roughness on diffracted X-ray intensities in Bragg–Brentano geometry and its effect on the structure determination by means of Rietveld analysis

1993 ◽  
Vol 8 (2) ◽  
pp. 74-83 ◽  
Author(s):  
W. Pitschke ◽  
H. Hermann ◽  
N. Mattern
Keyword(s):  
Surface Roughness ◽  
High Surface ◽  
Rietveld Analysis ◽  
Analytical Approximation ◽  
Thermal Parameters ◽  
Carbide Powder ◽  
X Rays ◽  
X Ray ◽  
Preparation Conditions ◽  
Powder Samples

Measurements of X-ray diffraction patterns of high-Tcsuperconductor and tungsten–carbide powder samples using a Bragg–Brentano diffractometer showed systematic variations of the intensities for different preparation conditions. For specimens with high surface roughness, an angle-dependent decrease of the intensities is observed which is caused by the microabsorption of the X-rays due to the microstructure of the powder sample. In Rietveld analysis, the thermal parameters are strongly influenced by this effect and may tend to negative values. A realistic description of the surface structure of flat powder samples is proposed. Using an analytical approximation for the microabsorption effect and its dependence on the microstructural parameters the Rietveld refinement yields reasonable values for the thermal parameters.

scholarly journals Investigation of environmental and therapeutic applications of holmium doped titanium dioxide (Ho-TiO2) nanocatalysts. Kinetic and thermodynamic study of the photocatalytic degradation of Safranin O dye

2021 ◽  
Author(s):  
F. Akbar Jan ◽  
Wajidullah ◽  
Rahat Ullah ◽  
Salman ◽  
Naimat Ullah ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Dna Binding ◽  
Tio2 Nanoparticles ◽  
Dye Degradation ◽  
Pure Tio2 ◽  
Binding Study ◽  
Tio2 Nps ◽  
X Ray ◽  
Doped Titanium Dioxide ◽  
Safranin O

Abstract Titanium dioxide (TiO2) and Holmium doped Titanium dioxide(Ho-TiO2) nanoparticles (NPs) were synthesized through Sol Gel method. The synthesized NPs were characterized by UV-Vis spectroscopy, X-ray diffraction (XRD), Energy dispersive X-ray analysis (EDX), Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and Photoluminescence spectroscopy. DNA binding, antibacterial, hemolytic and antioxidant assays of the synthesized nanoparticles were also carried out for finding their therapeutic applications. Successful doping of TiO2 with Ho reduced the band gap from 3.10 to 2.88 eV. SEM and XRD analysis showed that both TiO2 and Ho-TiO2 NPs exhibit tetragonal structure and as a result of doping the morphology of the particles improved and agglomeration reduced. PL emission intensity of TiO2 also reduced with doping.The holmium doped TiO2 were used for the first time against the degradation of Safranin O dye, DNA binding study and biocompatibility assay.The degradation of Safranin O dye over both the catalysts followed first order kinetics. The calculated activation energies for the photo degradation of given dye were found to be 51.7 and 35.2 kJ/mol using TiO2 and Ho-TiO2 NPs respectively. At 180 minutes time interval 84 and 87% dye degradation was observed using pure TiO2 and Ho-TiO2 NPs respectively. High percent degradation of dye was found at low concentration (20 ppm) and at optimal dosage (0.035 g) of both the catalysts. The rate of Safranin O dye degradation was found to increase with increase in temperature and pH of the medium. DNA binding study revealed that Ho-TiO2 NPs are more capable of binding to human DNA. Antibacterial activity study showed that Ho-TiO2 NPs were more efficient against both gram-negative and gram-positive bacterial strains as compared to pure TiO2. Hemolysis assay showed that TiO2 and Ho-TiO2 nanoparticles are non-biocompatible.Ho-TiO2 nanoparticles showed higher anti-oxidant activity as compared to bare TiO2.

scholarly journals Sintesa Titanium dioxide (TiO2) untuk Dye-Sensitized Solar Cell dengan Antosianin Bunga Rosella (Hibiscus sabdariffa)

2016 ◽  
Vol 3 (02) ◽  
pp. 181
Author(s):  
Elsa Ayu Adhitya ◽  
Ari Handono Ramelan ◽  
Suharyana S
Keyword(s):  
Titanium Dioxide ◽  
Solar Cells ◽  
Solar Cell ◽  
Anatase Phase ◽  
High Surface ◽  
Semiconductor Layer ◽  
Dye Sensitized Solar Cell ◽  
X Ray ◽  
Dye Sensitized ◽  
Dye Absorption

<span>Synthesis of <span><em>titanium dioxide </em><span>(TiO<span>2<span>) for dye sensitized solar cell (DSSC) with anthocyanins <span>rosella (<span><em>Hibisccus Sabdariffa</em><span>) has succesfully been done using sol-gel technique. The <span>semiconductor layer is a very important part of the DSSC since it gives a high surface area for <span>dye absorption which gives rise to high currents. DSSC was formed structually two electrodes <span>sandwiching the electrolyte. The working electrode is TiO<span>2 <span>layer coating on a Fluorine doped <span>Tin Oxide (FTO) glass substrat and sensitified with anthocyanin dye. A counter electrode is <span>carbon coating on the FTO. The fabricated solar cells have an area of 1.5 cm<span>2<span>, soaked in the <span>anthocyanin dye for 24 hours and 48 hours. The sample was characteriz with X-ray diffraction <span>method. The X-ray diffractogram indicates that the sample possesses rutile and anatase phase. <span>The dye absorption measured using spektrofotometer UV-Visible Lambda 25 showed the<br /><span>absorption occurs in the range 440-620 nm. The efficiencies of the solar cells measured by I-V <span>meter Keithley for 24 and 48 hours soaking are 0.0064(6)%, and 0.0151(4)%, respectively.</span></span></span></span></span></span></span></span></span></span></span><br /></span></span></span></span></span></span></span></span></span></span></span>

Structure and Magnetic Properties of Fe-Doped TiO2 Nano-Crystals by Nonaqueous Synthesis

2010 ◽  
Vol 663-665 ◽  
pp. 883-889
Author(s):  
Chu Feng Li ◽  
Ling Yue ◽  
Wen Jin ◽  
Ting Zhang ◽  
Huan Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Anatase Phase ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
X Ray ◽  
Transmission Electron ◽  
Crystallite Sizes ◽  
Nonaqueous Synthesis

Ti1-xFexO2 nanocrystals with x = 0.01, 0.02, 0.03 were prepared via a nonaqueous synthesis route. X-ray diffraction, transmission electron microscopy and high resolution transmission electron microscopy characterization confirmed the formation of anatase-phase nanocrystals with the average crystallite sizes of around 10 nm. The lattice constants alternate with the increase of the Fe content and no iron clusters were generated. X-ray photoelectron spectroscopy measurements showed that the substitutional Fe ions present mainly the valence of +3. The magnetic hysteresis loops measured at room temperature (RT) 300K showed that all the doped samples are atypically ferromagnetic, and the coercivity (Hc) of all the Fe-doping samples is around 0.1 T. An interpretation for the intrinsic RT ferromagnetism is put up based on the free carriers and defects induced interaction between Fe3+ ions.

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