scholarly journals Effect of Nitrogen Doping on Photocatalytic Activity of TiO2

2020 ◽  
Vol 6 (4) ◽  
pp. 918-923
Author(s):  
Pawar Mahendrasingh ◽  
Nimbalkar Vrushali ◽  
Gaonar Manisha ◽  
Khajone Anita ◽  
Taywade Rahul
Keyword(s):  
Anatase Phase ◽  
Visible Region ◽  
Chemical Characterization ◽  
Host Lattice ◽  
Doped Tio2 ◽  
Physico Chemical ◽  
N Doping ◽  
Degradation Reaction ◽  
Uv Visible ◽  
Surface Hydroxylation

Nitrogen doped TiO2 nanoparticles (N-doped TiO2) in different mol percentage (2-6 mol%) of nitrogen with anatase phase, have been prepared by using EDTA-glycol method. Samples were characterized by various physico-chemical techniques. Physico-chemical characterization revealed that crystallite size, surface hydroxylation, and tuning of optical band gap towards visible region of catalyst increases with increase in dopant concentration upto 4.0 mol% in TiO2 host lattice. Thereafter, the samples were used to photocatalytic degradation of the organic dye methylene blue (MB) under sunlight irradiation directly. The progress of photodegradation reaction was monitored by UV-visible spectroscopy. During photocatalytic reaction, the effect of calcination temperature, amount of catalyst, initial concentration of dye and the effect of pH on the rate of degradation reaction was also studied. It is clearly shown that N doping in TiO2 results in the enhancement of the degradation ability of MB in UV-visible light.

Quantitation and Adsorption of Glyphosate Using Various Treated Clay

2017 ◽  
Vol 231 (11-12) ◽  
Author(s):  
Rodrigo Mattos ◽  
Sabir Khan ◽  
Sajjad Hussain ◽  
José de Alencar Simoni
Keyword(s):  
Low Cost ◽  
Chemical Characterization ◽  
Adsorption Capacities ◽  
Physico Chemical ◽  
As Adsorption ◽  
Uv Visible

AbstractThe objective of this work is to develop a low-cost, alternative UV-visible Spectrophotometer method using ninhydrin to the current chromatography techniques (GC and HPLC), which is usually use for the quantitation of glyphosate. The physico-chemical characterization, such as adsorption capacities, effect of time and temperature has been studied. The reaction between the ninhydrin and compounds that present NH

Preparation of TiO2 Nanoparticles Doped with Cs+ and Sr2+ and Their Photocatalytic Activity under Solar Light

2010 ◽  
Vol 113-116 ◽  
pp. 1945-1950 ◽  
Author(s):  
Jie Luo ◽  
Xin Yuan Yang ◽  
De Liang Li
Keyword(s):  
Photocatalytic Activity ◽  
Anatase Phase ◽  
Sol Gel ◽  
Visible Region ◽  
Solar Light ◽  
Tetrabutyl Titanate ◽  
Strontium Nitrate ◽  
Doped Tio2 ◽  
As Doping ◽  
Xrd Patterns

Using cesium nitrate and strontium nitrate as doping metal ions source, Cs-doped TiO2 and Sr-doped TiO2 photocatalysts were successfully synthesized through the hydrolysis of tetrabutyl titanate by an acid-catalyzed sol-gel method. The photocatalytic activities of these catalysts prepared at 600 °C for 2 h were evaluated by the degradation of methyl orange in aqueous solution under solar light irradiation, and the as-prepared samples with higher photocatalytic efficiency were characterized by means of X-ray diffraction (XRD) and UV-Vis absorption spectroscopy. The XRD patterns indicate that the crystal structure still remains as anatase phase for the doped samples, and the average crystal size of TiO2, 0.1 at% Cs-doped TiO2 and 0.3 at% Sr-doped TiO2 is 21.3, 13.1 and 10.8 nm, respectively. The band gap absorption shows red shift to the visible region for the doped samples from the UV-Vis spectrogram. The results show that the photocatalytic activity of TiO2 nanoparticles doped with Cs+ and Sr2+ exhibits a significant improvement and their degradation efficiencies are more than 30% in comparison with those of TiO2 under the same condition, and the optimal doping concentration is determined to be 0.1 at% and 0.3 at% for Cs+ and Sr2+, respectively.

scholarly journals Visible Light-Driven high Photocatalytic Activity of Cu-Doped TiO2 Nanoparticles Synthesized by Hydrothermal Method

2018 ◽  
Vol 15 (3) ◽  
pp. 197-208 ◽  
Author(s):  
Ravi Kamble ◽  
Smita Mahajan ◽  
Vijaya Puri ◽  
Harish Shinde ◽  
Kalayanrao Garadkar
Keyword(s):  
Visible Light ◽  
Tio2 Nanoparticles ◽  
Hydrothermal Method ◽  
Anatase Phase ◽  
Visible Region ◽  
Oxygen Demand ◽  
High Photocatalytic Activity ◽  
Tio2 Nps ◽  
Doped Tio2 ◽  
Tio2 Lattice

TiO2 and Cu-doped TiO2 nanoparticles (NPs) with totally extraordinary substance of Cu by exploitation hydrothermal method. The part immaculateness, morphology, molecule estimate, optical properties, and elemental composition of as-incorporated Cu-doped TiO2 NPs were investigated by numerous systematic methods. The XRD designs unveiled Cu-doped TiO2 NPs inside the part unadulterated anatase phase. The plane of (101) XRD and XPS results show the lucky doping of Cu2+ inside the TiO2 lattice. The optical edges of Cu-doped TiO2 demonstrated a transparent light absorption in visible region that assumes an essential part inside the photocatalytic action underneath characteristic daylight. Certain Cu2+ content shows least PL intensity that backings the decrease in recombination rate of charge species. In addition, to get a handle on photocatalytic action, we have tried Cu-doped TiO2 for the degradation of Malachite Green (MG) under visible light. A large portion of 85% degradation was found for Cu-doped TiO2 (1.71 wt.%) underneath daylight minimum of 180 min, severally, that is past that of TiO2 (53%). Also, the degradation of the MG was affirmed by measurement of the chemical oxygen demand of the photodegraded solution. These outcomes demonstrates that the Cu-doped TiO2 NPs are extremely productive for the photodegration of the MG.

scholarly journals Photocatalysis over N-Doped TiO2 Driven by Visible Light for Pb(II) Removal from Aqueous Media

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 945
Author(s):  
Endang Tri Wahyuni ◽  
Titi Rahmaniati ◽  
Aulia Rizky Hafidzah ◽  
Suherman Suherman ◽  
Adhitasari Suratman
Keyword(s):  
Visible Light ◽  
Photocatalytic Oxidation ◽  
Irradiation Time ◽  
Aqueous Media ◽  
Visible Region ◽  
Significant Activity ◽  
Solution Ph ◽  
Doped Tio2 ◽  
Photo Oxidation ◽  
N Doping

The photocatalysis process over N-doped TiO2 under visible light is examined for Pb(II) removal. The doping TiO2 with N element was conducted by simple hydrothermal technique and using urea as the N source. The doped photocatalysts were characterized by DRUVS, XRD, FTIR and SEM-EDX instruments. Photocatalysis of Pb(II) through a batch experiment was performed for evaluation of the doped TiO2 activity under visible light, with applying various fractions of N-doped, photocatalyst mass, irradiation time, and solution pH. The research results attributed that N doping has been successfully performed, which shifted TiO2 absorption into visible region, allowing it to be active under visible irradiation. The photocatalytic removal of Pb(II) proceeded through photo-oxidation to form PbO2. Doping N into TiO2 noticeably enhanced the photo-catalytic oxidation of Pb(II) under visible light irradiation. The highest photocatalytic oxidation of 15 mg/L Pb(II) in 25 mL of the solution could be reached by employing TiO2 doped with 10%w of N content 15 mg, 30 min of time and at pH 8. The doped-photocatalyst that was three times repeatedly used demonstrated significant activity. The most effective process of Pb(II) photo-oxidation under beneficial condition, producing less toxic and handleable PbO2 and good repeatable photocatalyst, suggest a feasible method for Pb(II) remediation on an industrial scale.

scholarly journals Physico-Chemical Characterization and Biological Screening of Cyanex 302 complexes

2012 ◽  
Vol 4 (2) ◽  
pp. 427 ◽  
Author(s):  
T. K. Pal ◽  
M. A. Alam ◽  
M. A. A. A. A. Islam ◽  
S. R. Paul
Keyword(s):  
Metal Complexes ◽  
Magnetic Measurements ◽  
Chemical Characterization ◽  
Molar Conductance ◽  
Mass Determination ◽  
Ir Studies ◽  
Cyanex 302 ◽  
Physico Chemical ◽  
Uv Visible ◽  
Antibacterial And Antifungal

Several new complexes of Cr(III), Mn(II), Fe(II), Co(II) and Cu(II) containing Cyanex 302 [bis(2,4,4-trimethylpentyl) monothiophosphinic acid] were synthesized and characterized by elemental analysis, molar conductance, molecular mass determination, magnetic, UV-Visible and IR studies. The prepared metal complexes has the compositions: 2. [CrL3].H2O, 3. K[MnL3].H2O, 4. [FeL2].H2O, 5. K[CoL3] and 6. K[CuL3].H2O (Where, L means anion of bis(2,4,4-trimethylpentyl) monothiophosphinic acid). The complexes 2, 3, 5 and 6 are assumed to have octahedral geometries, but the complex 4 is tetrahedral based on experimental data. From magnetic measurements all the complexes are found to be paramagnetic. Measured molar conductance showed that the complexes 2 and 4 are non-electrolytes and complexes 3, 5 and 6 are electrolytes. Besides, some metal complexes have shown very good antibacterial and antifungal activities.Keywords:  Bis(2,4,4-trimethylpentyl) monothiophosphinic acid; Biological activity.© 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: http://dx.doi.org/10.3329/jsr.v4i2.9366 J. Sci. Res. 4 (2), 427-435 (2012)

scholarly journals Biosynthesis of fluorescent silver nanoparticles from Leea coccinea leaves and their antibacterial potentialities against Xanthomonas phaseoli pv phaseoli

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
María del Carmen Travieso Novelles ◽  
Annie Rubio Ortega ◽  
Beatriz Alvarez Pita ◽  
Mylene Corzo López ◽  
Lianet Díaz Pérez ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Chemical Characterization ◽  
Kinetic Studies ◽  
Spectroscopic Techniques ◽  
Stabilizing Agents ◽  
Physico Chemical ◽  
Environmentally Safe ◽  
Uv Visible ◽  
Microbial Growth Inhibition ◽  
High Degree

AbstractThe synthesis of silver nanoparticles (SNP) from plants is a simple, fast and environmentally safe route. In the present study, the aqueous extract of fresh leaves from Leea coccinea L. was evaluated as a possible source of reducing and stabilizing agents to obtain SNP. The synthesized SNP were characterized by spectroscopic techniques such as UV–visible spectrophotometry and Fourier transform infrared spectroscopy (FTIR), scanning electron and confocal microscopies and the antimicrobial activity against Xanthomonas phaseoli pv. phaseoli was evaluated using agar diffusion methods. The results showed that the evaluated extract was promising for the green synthesis of the SNP, which was visually identified by the formation of a dark-brown complex and the presence of a peak of maximum absorption at 470 nm in a UV–VIS spectrum. FTIR spectrum of SNP showed main characteristic signals of aromatic compounds, carboxylic group among others confirmed by phytochemical screening that made evident the presence of flavonoids, phenols, leucoanthocyanidins, terpenes and steroids groups. Fluorescent SNP with high degree of agglomeration were observed by the microscopical technics used. A promising antibacterial activity of SNP was shown by a zone of microbial growth inhibition. These results suggested the need for going deeper in the physico-chemical characterization and kinetic studies, as well as the biological evaluations to make possible the use of this plant source in the future development of antibacterial formulations for bean seed protection.

scholarly journals Highly Crystalline Ordered Cu-dopedTiO2Nanostructure by Paper Templated Method: Hydrogen Production and Dye Degradation under Natural Sunlight

2020 ◽  
Vol 4 (2) ◽  
pp. 48 ◽  
Author(s):  
Gajanan Kale ◽  
Sudhir Arbuj ◽  
Ujjwala Chothe ◽  
Supriya Khore ◽  
Latesh Nikam ◽  
...  
Keyword(s):  
Dye Degradation ◽  
Anatase Phase ◽  
Visible Region ◽  
Titanium Isopropoxide ◽  
Cu Doping ◽  
Doped Tio2 ◽  
Natural Sunlight ◽  
Diffraction Peaks ◽  
Templated Method ◽  
Synthesis Approach

A highly crystalline ordered Cu-TiO2 nanostructure was synthesized using a simple paper template method using cupric nitrate and titanium isopropoxide as precursors. The structural study by XRD confirmed the formation of highly crystalline anatase phase of Cu-TiO2. The broad diffraction peaks of Cu-TiO2 exhibit the nanocrystalline nature of the product. The optical study by UV-DRS indicated the red shift in absorption wavelength with an increase in Cu doping, i.e., towards the visible region. The FE-SEM and FE-TEM study validated the formation of spherical shaped nanoparticles of Cu-TiO2 having sizes in the range of 20–30 nm. Considering the absorption in the visible region, the photocatalytic study was performed for water splitting and rhodamine-B (RhB) dye degradation under natural sunlight. The 2% Cu-doped TiO2 showed the highest photocatalytic hydrogen evolution, i.e., 1400 µmol·g−1·h−1 from water, among the prepared compositions. The photocatalytic performance of Cu-TiO2 conferred complete degradation of RhB dye within 40 min. The higher activity in both cases was attributed to the formation of highly crystalline ordered nanostructure of Cu-doped TiO2. This synthesis approach has potential to prepare other highly crystalline ordered nanostructured semiconductors for different applications.

scholarly journals Tunable band gap of Bi3+-doped anatase TiO2 for enhanced photocatalytic removal of acetaminophen under UV-visible light irradiation

2018 ◽  
Vol 9 (1) ◽  
pp. 31-46 ◽  
Author(s):  
Ahmed Alzamly ◽  
Fathalla Hamed ◽  
Tholkappiyan Ramachandran ◽  
Maram Bakiro ◽  
Salwa Hussein Ahmed ◽  
...  
Keyword(s):  
Band Gap ◽  
Photoelectron Spectroscopy ◽  
Diffuse Reflectance Spectroscopy ◽  
Anatase Phase ◽  
Visible Region ◽  
Light Irradiation ◽  
Mole Percent ◽  
Tio2 Photocatalysts ◽  
X Ray ◽  
Uv Visible

Abstract A series of Bi3+-doped TiO2 photocatalysts has been prepared via the propylene oxide (PO) assisted sol-gel method. The effect of Bi3+ doping on structural surface morphology and optical properties of the as-prepared photocatalysts was characterized using UV-Visible (UV-Vis) diffuse reflectance spectroscopy, X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Brunauer-Emmett-Teller for determination of the specific surface area and porosity, and X-ray photoelectron spectroscopy. Increasing the Bi3+ doping percentage up to 10 mole percent, resulted in all as-prepared photocatalysts exhibiting pure anatase phase upon calcination at 400 °C for 3 hours. A red shift in optical band gap measurements was observed with increasing Bi3+ ion percent doping, which led to extension of the photocatalysts' activity to the visible region. The enhanced photocatalytic activity for removal of the pharmaceutical compound acetaminophen under UV-Vis light irradiation was demonstrated by comparing bismuth doped as-prepared photocatalysts with pure TiO2 photocatalysts prepared under the same conditions. Based on experimental conditions, the highest activity was achieved using 10 mole percent Bi3+-doped photocatalyst, where over a period of 4 hours more than 98% acetaminophen removal was achieved.

Investigation of Phase Transformation and Optical Properties of TiO2 Thin Films Deposited by Electron Beam Evaporation

2014 ◽  
Vol 941-944 ◽  
pp. 1279-1282
Author(s):  
Lin Hua Xu ◽  
Gai Ge Zheng ◽  
Yu Lin Chen ◽  
Jing Su
Keyword(s):  
Thin Films ◽  
Electron Beam ◽  
Annealing Temperature ◽  
Ion Beam ◽  
Anatase Phase ◽  
Visible Region ◽  
Electron Beam Evaporation ◽  
Atomic Force ◽  
Optical Bandgaps ◽  
Uv Visible

TiO2thin films were deposited by ion beam assisted electron beam evaporation and annealed at 200, 300, 400 and 500 ¡æ in air for one hour. The crystal structures and morphology of the samples were analyzed by an X-ray diffractometer and an atomic force microscope. The transmittance spectra were recorded by a UV-visible spectrophotometer. The results show that both the as-deposited TiO2thin film and that one annealed at 200 ¡æ are amorphous. The sample annealed at 300 ¡æ crystallizes in pure brookite phase and is preferentially oriented along the (121) plane. When the annealing temperature rises up to 400 and 500 ¡æ, TiO2thin films turn into pure anatase phase. All the samples exhibit high transmittance in the visible region. With the increase of annealing temperature, the transmittance slightly declines and the optical bandgaps also slightly decreases.

Sign in / Sign up

Export Citation Format

Share Document