Photocatalytic paraquat degradation over TiO2 modified by hydrothermal technique in alkaline solution

2017 ◽  
Vol 20 (2) ◽  
Author(s):  
Pallavi Nagaraju ◽  
Rattabal Khunphonoi ◽  
Shivaraju Harikaranahalli Puttaiah ◽  
Totsaporn Suwannaruang ◽  
Chatkamol Kaewbuddee ◽  
...  
Keyword(s):  
Alkaline Solution ◽  
Anatase Phase ◽  
Hydrothermal Process ◽  
Band Gap Energy ◽  
Xrd Pattern ◽  
Hydrothermal Technique ◽  
Gap Energy ◽  
Sem Image ◽  
Central Composite ◽  
Preparation Parameter

AbstractIn the present research, titanium nanotubes were synthesized via the soft hydrothermal method. A study on the effect of the synthesizing parameters such as aging temperature and time of the hydrothermal process on the photocatalytic paraquat degradation was explored. Central Composite Design (CCD) was used to determine the influence of the preparation parameter on the optimal condition, main and interaction effects on crystalline size, percent paraquat removal by adsorption and photocatalytic degradation as responses. The XRD pattern of the synthesized nanomaterial reported the anatase phase of titania nanotubes. SEM image of the prepared nanomaterial clearly indicated the agglomerated with tubular structure. Band gap energy of the nanotubes was found lower than that of the pure anatase TiO

The Optical Performance of Holmium Oxide Doped Tellurite Glass for Potential Optical Fiber

2021 ◽  
Vol 317 ◽  
pp. 95-99
Author(s):  
Muhammad Noorazlan Abd Azis ◽  
Halimah Mohamed Kamari ◽  
Suriani Abu Bakar ◽  
Azlina Yahya ◽  
Umar Saad Aliyu
Keyword(s):  
Refractive Index ◽  
Band Gap ◽  
Tellurite Glass ◽  
Optical Band Gap ◽  
Band Gap Energy ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
Gap Energy ◽  
Xrd Method ◽  
Nonlinear Pattern

Borotellurite glass had been widely applied in the field of optical communications and devices. In this work, holmium oxides doped borotellurite glass had been successfully fabricated via conventional melt-quenched technique. The structural properties of holmium doped tellurite glass were found using x-ray diffraction (XRD) method. The nonexistence of sharp peaks in XRD pattern shows that the inclusion of holmium tellurite glass leads to the formation long range of disorderness. The optical properties of the glass system such as refractive index and optical band gap energy are investigated using UV-Vis spectrophotometer. The value of refractive index is found in nonlinear trend along with holmium oxides concentration. It is found that the refractive index is more than 2 at 0.01, 0.03 and 0.04 of holmium concentrations. The optical band gap energy was found in similar trend with refractive index which is in nonlinear pattern.

scholarly journals Bulky Macroporous TiO2Photocatalyst with Cellular Structure via Facile Wood-Template Method

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Qingfeng Sun ◽  
Yun Lu ◽  
Jinchun Tu ◽  
Dongjiang Yang ◽  
Jun Cao ◽  
...  
Keyword(s):  
Cellular Structure ◽  
Anatase Phase ◽  
Dip Coating ◽  
X Ray Diffraction ◽  
Photocatalytic Ability ◽  
Xrd Pattern ◽  
X Ray ◽  
Sem Image ◽  
Transmission Electron ◽  
Wood Template

We report a bulky macroporous TiO2particles with cellular structure prepared in the presence of wood slices as template. Firstly, TiO2sol was coated onto the wood slices by repeated dip-coating process. Then, after calcinations at 550°C, the wood template could be removed, and the bulky TiO2structure was obtained. The prepared samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), and transmission electron microscope (TEM) techniques. XRD pattern confirmed the crystalline phase of the wood-templated TiO2is anatase phase. And interestingly, from the observation of SEM image, the wood-templated TiO2inherited the initial cellular structures of birch lumber (B. albosinensis Burk), and numerous macropores were observed in the sample. Meanwhile, the wood-templated TiO2presented a superior photocatalytic ability to decompose Rhodamine B (RhB) under ultraviolet irradiation.

scholarly journals Influence of Different Annealing Temperatures on the Structural and Optical Properties of TiO2 Nanoparticles Synthesized via Sol-Gel Method: Potential Application as UV Sensor

2021 ◽  
Vol 21 (2) ◽  
pp. 279
Author(s):  
Nur Munirah Safiay ◽  
Rozina Abdul Rani ◽  
Najwa Ezira Ahmed Azhar ◽  
Zuraida Khusaimi ◽  
Fazlena Hamzah ◽  
...  
Keyword(s):  
Optical Properties ◽  
Anatase Phase ◽  
Sol Gel ◽  
Band Gap Energy ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
Tio2 Thin Films ◽  
Xrd Pattern ◽  
X Ray ◽  
Annealing Temperatures

In this research, TiO2 thin films were prepared using a simple sol-gel spin coating process. The films were characterized using Field Emission Scanning Electron Microscopy (FE-SEM), Energy Dispersive Ray (EDX), X-ray diffraction (XRD) and Ultraviolet–visible Spectrophotometer in order to investigate the influence of different annealing temperatures to the structural and optical properties of TiO2. The surface morphology images from FE-SEM display a uniform layer of nanoparticles with a sample of 500 °C possess the most uniform and the visible spherical grain of TiO2 nanoparticles. EDX spectra confirm the presence of Ti and O elements in the samples. The structural properties from the XRD pattern demonstrate that the films are crystalline at a temperature of 500 and 600 °C and the peak (101) intensity was increased as the annealing temperature increased. They exist in the anatase phase at the preferred plane orientation of (101). The calculated crystallite size for 500 and 600 °C samples is 19.22 and 28.37 nm, respectively. The films also possessed excellent absorption in the ultraviolet (UV) region with optical band gap energy ranging from 3.32 to 3.43 eV. These results can be fundamental for the fabrication of a UV sensing device.

Band Gap Narrowed P Doped 1T@2H MoS2 Nanosheets Towards Synergistically Enhanced Visible Light Photochemical Property

2020 ◽  
Vol 15 (2) ◽  
pp. 257-263 ◽  
Author(s):  
Yipin Wang ◽  
Rongfang Zhang ◽  
Genliang Han ◽  
Xiaoping Gao
Keyword(s):  
Catalytic Activity ◽  
Visible Light ◽  
Band Gap ◽  
Surface Area ◽  
Hydrothermal Process ◽  
Band Gap Energy ◽  
Commercial Application ◽  
Photochemical Property ◽  
Mos2 Nanosheets ◽  
Gap Energy

The weak transport charge efficiency and great band gap energy of layered MoS2 hamper its further commercial application. To overcome these deficiencies, we report a simple, controlled and handy hydrothermal process for realizing 2H MoS2 to 1T MoS2 transition with P source. Due to the more conductive ability and larger surface area, P-doped 1T@2H MoS2 nanosheets show an outstanding catalytic activity. Noticeably, P-doped 1T@2H MoS2 nanosheets with narrowed bandgap exhibits a remarkable optical photochemical performance. It fully eliminates 50 ml of 20 mg L–1 RhB in 70 minutes with outstanding recycling and structural stability by using 10 mg catalyst.

Effect of the ZnO Rods Growth Time to the Conductivity of ZnO Thin Film Combined with N3 Dye

2011 ◽  
Vol 383-390 ◽  
pp. 3286-3290
Author(s):  
Engku Abd Engku Ali Ghapur ◽  
W.A. Dhafina ◽  
S. Hasiah ◽  
N.A.N. Ali
Keyword(s):  
Thin Film ◽  
Aspect Ratio ◽  
Band Gap ◽  
Zno Nanorods ◽  
Hydrothermal Process ◽  
Hydrothermal Solution ◽  
Band Gap Energy ◽  
Growth Time ◽  
Gap Energy ◽  
Zno Rods

In this work, ZnO nanorod has been grown by hydrothermal solution method. The samples were prepared by two stages. The first stage was seeding process where the ZnO nanoparticles are spin-casted onto ITO coated glasses and the second stage was hydrothermal process. The morphology of nanorods were investigated by using scanning electron microscope (SEM) and different of length and diameter of nanorods with different growth durations have been observed. The differences of diameters and aspect ratio of nanorods have affected the optical and electrical properties of the ZnO-coated thin film with dye due to its surface area and morphologies of growth rod. Aspect ratio of ZnO nanorods increases by increasing the reaction time (growth time). From the band gap energy study, the thin film with the longest ZnO nanorods growth time has the lowest band gap energy (3.55 eV). The higher aspect ratio of the nanorod affected the conductivity, by increasing the conductivity when combined with N3 dye.

Synthesis and Characterization of SnO2/N-Doped TiO2 Nanoparticles

2012 ◽  
Vol 488-489 ◽  
pp. 22-26
Author(s):  
Lek Sikong ◽  
H. Panritdam ◽  
Juntima Chungsiriporn ◽  
S. Te-Chato
Keyword(s):  
Photocatalytic Activity ◽  
Crystallite Size ◽  
Anatase Phase ◽  
Sol Gel ◽  
Band Gap Energy ◽  
High Photocatalytic Activity ◽  
Gap Energy ◽  
Xrd Patterns ◽  
Tin Tetrachloride

SnO2/N – doped TiO2photocatalysts were prepared by the modified sol-gel method. Tin tetrachloride pentahydrate, urea and polyethylene glycol were used as precursors and calcined at a temperature of 500 °C for 2 h for making powders. Different interstitial amount of nitrogen additives were in range of 0 to 40 mol%N. The XRD patterns show the TiO2nanocomposites are anatase phase. It was also apparent that doped nitrogen has an effect on crystallite size and band gap energy on absorbed light wavelength leading of enhancement of photocatalytic activity of TiO2composite nanoparticles. The result showed 20 mol%N of TiO2nanocomposites exhibited high photocatalytic activity, redshift in adsorption edge and a small crystallite size.

Physical Properties Study of TiO2 Nanoparticle Synthesis via Hydrothermal Method Using TiO2 Microparticles as Precursor

2013 ◽  
Vol 772 ◽  
pp. 365-370 ◽  
Author(s):  
Mohd Hasmizam Razali ◽  
M.N. Ahmad-Fauzi ◽  
Abdul Rahman Mohamed ◽  
Srimala Sreekantan
Keyword(s):  
Electron Microscopy ◽  
Band Gap ◽  
Hydrothermal Method ◽  
Hydrothermal Reaction ◽  
Anatase Phase ◽  
Nanoparticle Synthesis ◽  
Band Gap Energy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Gap Energy

Titanium dioxide (TiO2) nanoparticles were successfully synthesised by hydrothermal method using TiO2 microparticle powder (Merck) as precursor. TiO2 microparticles powder (~160 nm) was mixed with 10 M NaOH and treated hydrothermally at 150 °C and 2 MPa pressure in autoclave for 24 hours. After hydrothermal reaction was completed, the sample was washed, dried and heated at 500 °C for 2 hours to produce TiO2 nanoparticles. The synthesised nanoparticles were characterized using field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and raman spectroscopy. UV-Vis DRS was used to determine the band gap energy. Field emissions and transmissions electron microscopy images revealed that nanoparticles obtained was about 14 nm. X-ray diffraction patterns showed that TiO2 nanoparticles were anatase phase (tetragonal). The band gap energy of TiO2 nanoparticles was determined to be 3.32 eV.

The Preparation of Porous TiO2 Nanostructure by Triblock Copolymers Co-Templating Method of TiOSO4 Solution Derived from Ilmenite Ore

2014 ◽  
Vol 887-888 ◽  
pp. 132-138
Author(s):  
Akhmad Herman Yuwono ◽  
Hanum Latifa ◽  
Amalia Sholehah
Keyword(s):  
Pore Diameter ◽  
Anatase Phase ◽  
Average Crystallite Size ◽  
Porous Titanium ◽  
Band Gap Energy ◽  
Narrow Pore Size Distribution ◽  
Templating Method ◽  
Gap Energy ◽  
Porous Titania ◽  
Vis Spectroscopy

Porous titanium dioxide (TiO2) nanostructure has been successfully synthesized by a modified solgel method using non-ionic triblock copolymer pluronic F-127 as surfactant template and titanylsulfate (TiOSO4) solution as the inorganic precursor derived from the sulfuric process of Bangka-Indonesia ilmenite ore. The resulting nanostructure samples were characterized by XRD, SEM, TEM and UV-Vis spectroscopy. The results showed that porous titania particles have sphere-like shape and can be indexed as the anatase phase with average crystallite size of about 5-7 nm, narrow pore size distribution with an averange pore diameter of about 3-5 nm and band gap energy in the range of 3.10 3.16 eV.

Nanocrystallinity Enhancement of TiO2 Nanotubes by Post-Hydrothermal Treatment

2011 ◽  
Vol 277 ◽  
pp. 90-99 ◽  
Author(s):  
Akhmad Herman Yuwono ◽  
Nofrijon Sofyan ◽  
Indriana Kartini ◽  
Alfian Ferdiansyah ◽  
Tego Hadi Pujianto
Keyword(s):  
Hydrothermal Treatment ◽  
Optical Characteristic ◽  
Hydrothermal Process ◽  
Sodium Titanate ◽  
Xrd Analysis ◽  
Band Gap Energy ◽  
Crystallite Growth ◽  
Hydrothermal Temperature ◽  
Gap Energy ◽  
Vis Spectroscopy

In the present research, a modified post-hydrothermal treatment with different temperature of 80-150°C has been applied on as-annealed TiO2 nanotubes derived from conventional hydrothermal process. The treatment has two-fold objectives, i.e. enhancing the nanocrystallinity of anatase TiO2, and at the same time maintaining the integrity of nanotube structures. The resulting TiO2 nanotubes were characterized by using XRD and UV-Vis spectroscopy. The XRD analysis revealed that the as dried TiO2 nanotubes contain combined crystalline structures of sodium-titanate and anatase. It was also found that by increasing the post-hydrothermal temperature from 80 to 150°C, the nanocrystallinity of nanotubes enhances as indicated by increasing the crystallite size of anatase TiO2 from 6.93 to 7.81 nm. The anatase crystallite growth affected the optical characteristic of nanotubes, as represented with the reduction of the band gap energy, Eg from 3.75 to 3.67 eV by using Kubelka-Munk analysis for the obtained UV-Vis reflectance spectra. TEM observation confirms that the integrity of nanotubes structure can be well-maintained upon post-hydrothermal treatment.

Electronic Chemical Properties of Vanadium Doped TiO2 for Photocatalytic Degradation of BTEX

2011 ◽  
Vol 700 ◽  
pp. 223-226 ◽  
Author(s):  
Laksana Laokiat ◽  
Pongtanawat Khemthong ◽  
Nurak Grisdanurak
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Visible Light Irradiation ◽  
Active Sites ◽  
Chemical Properties ◽  
Band Gap Energy ◽  
Xrd Pattern ◽  
Gap Energy ◽  
Electronic Chemical ◽  
Tetravalent State

V-doped TiO2(V-TiO2) was synthesised using solvothermal technique and immobilised onto fibreglass cloth (FGC). The XRD pattern of doped sample showed slight positive shift to higher angle indicating that the V ions were well substituted into the Ti lattices. The band-gap energy of V-TiO2was lower than that of P25, pure TiO2, (3.28 eV for P25 and 2.90 eV for V-TiO2) demonstrating it could be excited by visible light. The XANES spectra of the Ti K-edge transition indicated most Ti ions were in the tetravalent state with octahedral coordination. The A2species on the surfaces of V-TiO2were found to be the main active sites during photocatalytic degradation of BTEX under visible light irradiation.

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