Sol–gel synthesis of erbium-doped ZnO with nest structure for photocatalysis

2018 ◽  
Vol 11 (01) ◽  
pp. 1750082 ◽  
Author(s):  
Chun Li ◽  
Zuoyun Yan ◽  
Yuan Zhou ◽  
Shuang Zhao ◽  
Xiaotao Zhang ◽  
...  
Keyword(s):  
Uv Light ◽  
Sol Gel ◽  
Kinetic Studies ◽  
Bandgap Energy ◽  
Nest Structure ◽  
Er Doping ◽  
Erbium Doped ◽  
Doped Zno ◽  
Er Doped ◽  
Sol Gel Synthesis

Rare earth erbium-doped ZnO samples were synthesized via a facile sol–gel method. The influences of Er-doping on structural properties, morphological features and optical properties were characterized by XRD, BET, SEM and UV–Vis DRS techniques. The results showed that the as-synthesized products were well crystallined in the absence of impurity phases and Er-doping resulted in the reduction of bandgap energy deducted from the UV–Vis DRS results. Amongst the samples, layer-like 0.5% Er-doped ZnO with nest structure achieved the highest photodegradation (90.7%) of methylene blue (MB) after UV light irradiation for 2[Formula: see text]h. The kinetic studies of MB degradation over different Er-doped ZnO were also conducted and proved to obey the pseudo-first-order kinetics.

Synthesis of Cu2+ Doped ZnO by the Combination of Sol-Gel-Sonochemical Methods with Duck Egg Albumen as Additive for Photocatalytic Degradation of Methyl Orange

2021 ◽  
Vol 21 (3) ◽  
pp. 564
Author(s):  
Sherly Kasuma Warda Ningsih ◽  
Hary Sanjaya ◽  
Bahrizal Bahrizal ◽  
Edi Nasra ◽  
Syuhada Yurnas
Keyword(s):  
Methyl Orange ◽  
Uv Light ◽  
Irradiation Time ◽  
Sol Gel ◽  
Bandgap Energy ◽  
Sonochemical Method ◽  
Chemical Additives ◽  
Egg Albumen ◽  
Doped Zno ◽  
Duck Egg

Cu2+ doped ZnO by green synthesis was successfully prepared by using a combination of the Sol-Gel-Sonochemical method. Duck egg albumen was used as an additive, a substitute for chemical additives, such as monoethanolamine (MEA) and diethanolamine (DEA). Zn(CH3COO)2·2H2O was used as a precursor, Cu(CH3COO)2·H2O was used as a dopant source with concentrations of 5 wt.%, and isopropanol was used as the solvent. The addition of albumen variations was 10, 20, 30, 40, and 50 mL. The prepared catalyst was applied for the degradation of the methyl orange dyes by using photosonolysis with variations of the degradation time of methyl orange for 30, 60, 90, 120, 150, 180, and 240 min. FTIR spectra showed stretching at 400–550 cm–1 indicating the presence of Zn–O and Zn–O–Cu metal oxides. The optimum bandgap energy value was 2.82 eV with the addition of 30 mL of albumen. XRD analysis showed the optimum particle size of 16.62–53.21 nm after adding 30 mL of additives. The SEM image showed a spherical shape with an average diameter of 2.7 μm. The optimum percentage of degradation obtained was 94.88%, with the irradiation time under UV light for 210 min.

Sol–gel synthesis of Ba‐doped ZnO nanoparticles and its use in varistor ceramics

2018 ◽  
Vol 13 (10) ◽  
pp. 1506-1509 ◽  
Author(s):  
Rong Yang ◽  
Xiao Qu ◽  
Mao‐Hua Wang
Keyword(s):  
Zno Nanoparticles ◽  
Sol Gel ◽  
Doped Zno ◽  
Sol Gel Synthesis

Effect of annealing temperature on optical properties of Er-doped ZnO films prepared by sol–gel method

2008 ◽  
Vol 148 (1-3) ◽  
pp. 35-39 ◽  
Author(s):  
Fanyong Ran ◽  
Lei Miao ◽  
Sakae Tanemura ◽  
Masaki Tanemura ◽  
Yongge Cao ◽  
...  
Keyword(s):  
Optical Properties ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Zno Films ◽  
Gel Method ◽  
Sol Gel Method ◽  
Doped Zno ◽  
Er Doped

scholarly journals Room Temperature Synthesis of V-Doped TiO2 and Its Photocatalytic Activity in the Removal of Caffeine under UV Irradiation

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 911 ◽  
Author(s):  
Olga Sacco ◽  
Diana Sannino ◽  
Mariantonietta Matarangolo ◽  
Vincenzo Vaiano
Keyword(s):  
Room Temperature ◽  
Uv Light ◽  
Sol Gel ◽  
Doped Tio2 ◽  
Toc Removal ◽  
Calcination Step ◽  
Caffeine Degradation ◽  
Wavelength Emission ◽  
Sol Gel Synthesis ◽  
Uv Leds

In this work, the influence of simple acids in the room temperature sol-gel synthesis of TiO2 was investigated and the efficiency of prepared photocatalysts was evaluated in the removal of caffeine. To improve the photoactivity of TiO2, vanadium-doped TiO2 (VTiO2) samples were obtained starting from different amount of vanadyl sulphate as a dopant source. The samples were centrifuged, washed and finally dried at room temperature, and no calcination step was carried out. The prepared photocatalysts were characterized by different techniques (X-ray powder diffraction (XRD), specific surface area (SSA), ultraviolet-visible diffuse reflectance spectra (UV-vis DRS) and Raman). VTiO2 photocatalysts were tested in the photocatalytic removal of aqueous solutions containing caffeine. The photocatalytic tests were carried out in a recirculating batch cylindrical photoreactor irradiated by a UV LEDs strip (nominal power of 12 W and wavelength emission peak at about 365 nm) surrounding the external surface of the reactor. The optimized VTiO2 photocatalyst was able to reach a caffeine degradation of about 96% after 360 min of UV light irradiation with a total organic carbon (TOC) removal of 72%.

Sol-gel synthesis and nanostructured semiconductor analysis of undoped and Cd-doped ZnO thin films

Optik ◽  
2018 ◽  
Vol 169 ◽  
pp. 303-313 ◽  
Author(s):  
Badis Rahal ◽  
Boubekeur Boudine ◽  
Youssef Larbah ◽  
Lakhdar Guerbous ◽  
Miloud Sebais ◽  
...  
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Zno Thin Films ◽  
Doped Zno ◽  
Sol Gel Synthesis ◽  
Nanostructured Semiconductor

Influence of Annealing on the Structure and 1.54 µm Photoluminescence of Er-Doped ZnO Thin Films Prepared by Sol–Gel Method

2011 ◽  
Vol 50 (6R) ◽  
pp. 061101 ◽  
Author(s):  
Lei Miao ◽  
Xiudi Xiao ◽  
Fanyong Ran ◽  
Sakae Tanemura ◽  
Gang Xu
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Zno Thin Films ◽  
Gel Method ◽  
Sol Gel Method ◽  
Doped Zno ◽  
Er Doped

Performance of Ultraviolet Photoconductive Sensor Based on Aluminium-Doped Zinc Oxide Nanorod-Nanoflake Network Thin Film Using Aluminium Contacts

2013 ◽  
Vol 832 ◽  
pp. 298-302 ◽  
Author(s):  
M.H. Mamat ◽  
Nor Diyana Md Sin ◽  
I. Saurdi ◽  
N.N. Hafizah ◽  
Mohd Firdaus Malek ◽  
...  
Keyword(s):  
Thin Film ◽  
Zinc Oxide ◽  
Seed Layer ◽  
Uv Light ◽  
Sol Gel ◽  
Zno Nanorod ◽  
Immersion Method ◽  
Coated Glass Substrate ◽  
Sensor Applications ◽  
Doped Zno

In this research, we fabricated UV photoconductive sensor using aluminium (Al)-doped ZnO nanorod-nanoflake network thin film. These nanostructures were deposited on the seed-layer-coated glass substrate using sonicated sol-gel immersion method. By using Al contacts, it was found that the performance of the UV photoconductive sensor is very good. The responsivity of the device was 46.4 mA/W with sensitivity of 17.5 under 365-nm UV light (5 mW/cm2) at bias voltage of 10 V. Our study revealed that these nanostructures are very promising material for the UV photoconductive sensor applications.

scholarly journals Degradation and Loss of Antibacterial Activity of Commercial Amoxicillin with TiO2/WO3-Assisted Solar Photocatalysis

2021 ◽  
Author(s):  
Augusto Arce-Sarria ◽  
Fiderman Machuca-Martínez ◽  
Ciro Bustillo-Lecompte ◽  
Aracely Hernández-Ramírez ◽  
José Colina-Márquez
Keyword(s):  
Antibacterial Activity ◽  
Calcination Temperature ◽  
Sol Gel ◽  
Rutile Phase ◽  
Pilot Scale ◽  
Bandgap Energy ◽  
Amoxicillin Removal ◽  
Sol Gel Synthesis ◽  
Parabolic Collector ◽  
Catalyst Load

In this study, a TiO2 catalyst, modified with tungsten oxide (WO3), was synthesized to reduce its bandgap energy (Eg) and to improve its photocatalytic performance. For the catalyst evaluation, the effect of the calcination temperature on the solar photocatalytic degradation was analyzed. The experimental runs were carried out in a CPC (compound parabolic collector) pilot-scale solar reactor, following a multilevel factorial experimental design, which allowed analysis of the effect of the calcination temperature, the initial concentration of amoxicillin, and the catalyst load on the amoxicillin removal. The most favorable calcination temperature for the catalyst performance, concerning the removal of amoxicillin, was 700 °C; because it was the only sample that showed the rutile phase in its crystalline structure. Regarding the loss of the antibiotic activity, the inhibition tests showed that the treated solution of amoxicillin exhibited lower antibacterial activity. The highest amoxicillin removal achieved in these experiments was 64.4% with 100 ppm of amoxicillin concentration, 700 °C of calcination temperature, and 0.1 g L−1 of catalyst load. Nonetheless, the modified TiO2/WO3 underperformed compared to the commercial TiO2 P25, due to its low specific surface and the particles sintering during the sol-gel synthesis

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