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

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

Sol-Gel Synthesis of SnO2-TiO2 System - Morphologic, Photocatalytic and Antibacterial Properties

2018 ◽  
Vol 762 ◽  
pp. 273-277
Author(s):  
Anzelms Zukuls ◽  
Gundars Mežinskis ◽  
Aigars Reinis ◽  
Ingus Skadins ◽  
Juta Kroica ◽  
...  
Keyword(s):  
Sol Gel ◽  
Antibacterial Properties ◽  
Soda Lime ◽  
Rutile Phase ◽  
X Ray Diffraction ◽  
Oxide Coatings ◽  
Atomic Force ◽  
Heat Treated ◽  
Soda Lime Silicate Glass ◽  
Sol Gel Synthesis

SnO2-TiO2 sol-gel coatings on soda-lime silicate glass heat treated at 500 °C and xerogel specimens also heat treated at 500 °C were investigated in this study. The morphology of 1, 3, 5 and 7 mol% SnO2 doped titanium oxide coatings were evaluated with a scanning electron microscope (SEM), an atomic force microscope (AFM) and an UV-VIS light spectrophotometer, whilst xerogel structure was analysed with X-ray diffraction spectroscopy (XRD). The physicochemical properties of the TiO2-SnO2 systems depended mainly on the Sn-to-Ti ratio. The surface morphology of the layer was compact and homogeneous with no visible cracks. Anatase and rutile phase was found in the tested 1, 3, 5, 7 and 10 mol% SnO2 doped and heat treated xerogel specimens. Rutile phase content in the heat treated xerogel was reduced, if Sn4+ content was increased. Photocatalytic activity and antibacterial properties were evaluated as well.

Sol-gel Synthesis of a Novel χSm2Ti2O7/HZSM-5 Composite Photocatalyst for the Promoted Activity on RBR X-3B Degradation

2017 ◽  
Vol 14 (1) ◽  
pp. 17-25
Author(s):  
Wenjie Zhang ◽  
Jiao Yang ◽  
Ling Du
Keyword(s):  
Photocatalytic Activity ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Sol Gel ◽  
Pyrochlore Phase ◽  
Bandgap Energy ◽  
Powder Materials ◽  
Sol Gel Synthesis ◽  
Adsorption Desorption

Background: Pyrochloro structured Sm2Ti2O7 has photocatalytic activity on degradation of organic substances and on hydrogen evolution from water. Powder materials usually encounter the obstacle of separating from treated water. HZSM-5 zeolite is a kind of porous structured material with large surface area. Its role as a support for Sm2Ti2O7 is interesting. Methods: The supported Sm2Ti2O7 was synthesized using sol-gel method. The composite χSm2Ti2O7/HZSM-5 was characterized by XRD, SEM, TEM, FT-IR/FIR, UV-Vis DRS, N2 adsorption- desorption and XPS measurements. Photocatalytic degradation of Reactive Brilliant Red X-3B (RBR X-3B) was measured to evaluate the activity of the composite. Results: Sm2Ti2O7 is in the pyrochlore phase after loading on the surface of HZSM-5 zeolite. The crystal cell of pyrochlore Sm2Ti2O7 continuously expanses with decreasing Sm2Ti2O7 loading content in the composite. Bandgap energy of Sm2Ti2O7 is enlarged after supporting. The specific surface area of Sm2Ti2O7 was enlarged from 9.8 m2/g to 93 m2/g after loading. Both of the adsorption capacity and photocatalytic activity of the χSm2Ti2O7/HZSM-5 are greater than those of pure Sm2Ti2O7. After 120 min of irradiation, 73.1% of the initial RBR X-3B molecules are decomposed on 70%Sm2Ti2O7/HZSM-5, and only 27.7% of the dye is decomposed on the bare Sm2Ti2O7. Conclusion: Sm2Ti2O7 crystal growth is constrained after loading due to dispersion of Sm2Ti2O7 on the surface of HZSM-5. The specific surface area of Sm2Ti2O7 is significantly enlarged after loading. All the supported samples have greatly enhanced photocatalytic activity as compared to the bare Sm2Ti2O7.

Effects of calcination temperature on sol-gel synthesis of porous La2Ti2O7 photocatalyst on degradation of Reactive Brilliant Red X3B

2017 ◽  
Vol 20 (2) ◽  
Author(s):  
Dechang Han ◽  
Zheng Ma ◽  
Ling Du ◽  
Wenjie Zhang
Keyword(s):  
Photocatalytic Degradation ◽  
Calcination Temperature ◽  
Sol Gel ◽  
Lanthanum Titanate ◽  
Sol Gel Synthesis

AbstractThe effects of calcination temperature on properties of porous lanthanum titanate using PEG4000 template in a sol-gel route were studied. Photocatalytic degradation of Reactive Brilliant Red X3B on the materials was evaluated. Monoclinic La

SOL-GEL SYNTHESIS AND CHARACTERIZATION OF COPPER STABILIZED ZIRCONIA NANOPARTICLES

2011 ◽  
Vol 25 (21) ◽  
pp. 2823-2839 ◽  
Author(s):  
Y. VAHIDSHAD ◽  
H. ABDIZADEH ◽  
H. R. BAHARVANDI ◽  
M. AKBARI BASERI
Keyword(s):  
Particle Size ◽  
Hydrogen Production ◽  
Calcination Temperature ◽  
Aging Temperature ◽  
Sol Gel ◽  
Chelating Agent ◽  
Molar Ratio ◽  
Gel Method ◽  
Sol Gel Method ◽  
Sol Gel Synthesis

A sol-gel method is investigated to synthesize CuO – ZrO 2 nanoparticles as catalyst for hydrogen production from methanol. Finer precursor nanoparticles give rise to larger specific areas in catalyst which result in a high hydrogen production. The effects of some critical process parameters on the sol-gel synthesis of CuO – ZrO 2 nanoparticles are studied. These parameters are affected on synthesis of CuO – ZrO 2 when it is prepared with sol-gel method. Particle size and distribution are considered as the results. The parameters including the effect of calcination temperature, aging temperature, nature and concentration of catalyst (acidic or basic conditions), H 2 O /precursor molar ratio, and chelating agent that have been identified as most important, are focused. It is found that the calcination temperature strongly influenced the morphology and interaction between the active species and support, and hence the structure and catalytic performance. Nature and concentration of catalyst ( pH value), chelating agent, ( H 2 O /precursor) molar ratio and also aging temperature have influence on the nanoparticles. Thus, by controlling these factors, it is possible to vary the morphology and properties of the sol-gel-derived inorganic network over wide ranges. Morphology, particle size and distribution, phase evaluation, structure, and chemical analysis of the products are investigated by SEM, TEM, DTA/TG, XRD and EDX respectively.

Preparation of TiO2 Nanopowders by Non-Hydrolytic Sol−Gel and Solvothermal Synthesis

2011 ◽  
Vol 110-116 ◽  
pp. 1934-1939
Author(s):  
Yan Xiang Wang ◽  
Min Xu ◽  
Jian Sun
Keyword(s):  
Size Distribution ◽  
Solvothermal Synthesis ◽  
Solvothermal Method ◽  
Sol Gel ◽  
Rutile Phase ◽  
Uniform Size ◽  
Oxygen Donor ◽  
Method Effects ◽  
Sol Gel Synthesis ◽  
Uniform Size Distribution

TiO2nanopowders were synthesized by non-hydrolytic sol−gel synthesis and solvothermal method. Effects of the type of alcohol on the properties of TiO2nanopowders were investigated. XRD and FSEM were used to characterize TiO2nanopowders. The results showed that TiO2nanopowders with diameters of about 50nm and micro-spheres with diameters of about 400~500nm were obtained by non-hydrolytic sol−gel synthesis, when ethanol and isopropanol were used as oxygen donor and solvent, respectively. TiO2prepared with ethanol by non-hydrolytic sol−gel synthesis and calcined at 700°C consisted only 3.8% rutile phase. After solvothermal synthesis, TiO2nanopowders with diameters of about 50nm were obtained when ethanol and isopropanol were used as the oxygen donor. However, submicrometer spheres with uniform size distribution were obtained with 1-octanol.

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.

scholarly journals Effect of γ-Irradiation and Calcination Temperature of Nanosized ZnO/TiO2 System on Its Structural and Electrical Properties

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Abdelrahman A. Badawy ◽  
Shaymaa E. El-Shafey ◽  
Suzan Abd El All ◽  
Gamil A. El-Shobaky
Keyword(s):  
Electrical Properties ◽  
Calcination Temperature ◽  
Sol Gel ◽  
Ammonium Hydroxide ◽  
Rutile Phase ◽  
Degree Of Crystallinity ◽  
Γ Irradiation ◽  
Mobility Of Charge Carriers ◽  
Structural And Electrical Properties ◽  
The Matrix

ZnO/TiO2 powders were synthesized by sol-gel method using ammonium hydroxide. The effects of calcination temperature (500–1000°C) and gamma rays (with doses from 25 to 150 kGy) on the phases present and their electrical properties were investigated. The results revealed that heating the system investigated at 500°C led to the formation of ZnTiO3-rohom and TiO2-rutile. The degree of crystallinity of the phases produced increased by increasing the calcination temperature. When heating at 1000°C, ZnTiO3-rohom turned to ZnTiO3-cubic but the rutile phase remained stable. γ-Irradiation decreased considerably the crystallite size of the rutile phase from 146 to 63 nm and that of ZnTiO3-cubic decreased from 101 to 39 nm. This treatment led also to the creation of holes in the matrix of irradiated solids which increased the mobility of charge carriers (electrons) leading to a significant increase in the electrical conductivity reaching to 102 to 103-fold.

Sol-Gel Synthesis and Characterization of TiO2-Based Photocatalyst and its Photoactivity Research

2013 ◽  
Vol 864-867 ◽  
pp. 613-616
Author(s):  
Xue Mei Qi ◽  
Xin Yuan Zhu ◽  
Jiang Wu ◽  
Yu Wu ◽  
Han Cheng Luo
Keyword(s):  
Anatase Phase ◽  
Sol Gel ◽  
Great Influence ◽  
Rutile Phase ◽  
Xrd Diffraction ◽  
Sol Gel Process ◽  
Photocatalytic Activities ◽  
Stirring Time ◽  
Sol Gel Synthesis

The TiO2-based photocatalysts have been synthesized by using sol-gel process and their photocatalytic activities were studied by the degradation of methylene blue (MB). It was shown that the calcination temperature has great influence on the crystalline phase transition of TiO2. For all the samples (Ag-doped and undoped TiO2photocatalysts) calcined at 573K, only anatase phase was observed from XRD diffraction spectra and the intensity of peaks is weak. After the calcined at 773K, a mixture of anatase-rutile phase appeared. The contents of rutile phase were about 85% and77% for undoped and Ag-adopted TiO2photocatalysts.There were only rutile phases for all the TiO2photocatalysts calcined at 973K observed from XRD diffraction spectra. Magnetically stirring time of A solution before added B had no obvious effects on the polymorphs transition of TiO2.

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