A novel AgI/BiOI/pg-C3N4 composite with enhanced photocatalytic activity for removing methylene orange, tetracycline and E. coli

2020 ◽  
Vol 177 ◽  
pp. 108253 ◽  
Author(s):  
Ding Yuan ◽  
Liying Huang ◽  
Yeping Li ◽  
Hao Wang ◽  
Xiuquan Xu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
E Coli ◽  
Methylene Orange

Controllable synthesis of phosphate-modified BiPO4 nanorods with high photocatalytic activity: surface hydroxyl groups concentrations effects

RSC Advances ◽  
2015 ◽  
Vol 5 (121) ◽  
pp. 99712-99721 ◽  
Author(s):  
Yan Li ◽  
Yawen Wang ◽  
Yu Huang ◽  
Junji Cao ◽  
Wingkei Ho ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Surface Modification ◽  
Photocatalytic Performance ◽  
High Photocatalytic Activity ◽  
Hydroxyl Groups ◽  
Controllable Synthesis ◽  
Surface Hydroxyl ◽  
Methylene Orange ◽  
Surface Hydroxyl Groups

Surface modification by phosphate efficiently improves the photocatalytic performance of BiPO4 for the degradation of methylene orange (MO), by enhancing the concentration of surface hydroxyl groups and improving its hydrophilicity.

scholarly journals 1D TiO2 Nanostructures Prepared from Seeds Presenting Tailored TiO2 Crystalline Phases and Their Photocatalytic Activity for Escherichia coli in Water

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Julieta Cabrera ◽  
Dwight Acosta ◽  
Alcides López ◽  
Roberto J. Candal ◽  
Claudia Marchi ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Photocatalytic Activity ◽  
Bactericidal Activity ◽  
Sol Gel ◽  
Titanium Isopropoxide ◽  
E Coli ◽  
1D Nanostructures ◽  
Sol Gel Synthesis ◽  
Hydrolysis Of ◽  
Tio2 Nanostructures

TiO2 nanotubes were synthesized by alkaline hydrothermal treatment of TiO2 nanoparticles with a controlled proportion of anatase and rutile. Tailoring of TiO2 phases was achieved by adjusting the pH and type of acid used in the hydrolysis of titanium isopropoxide (first step in the sol-gel synthesis). The anatase proportion in the precursor nanoparticles was in the 3–100% range. Tube-like nanostructures were obtained with an anatase percentage of 18 or higher while flake-like shapes were obtained when rutile was dominant in the seed. After annealing at 400°C for 2 h, a fraction of nanotubes was conserved in all the samples but, depending on the anatase/rutile ratio in the starting material, spherical and rod-shaped structures were also observed. The photocatalytic activity of 1D nanostructures was evaluated by measuring the deactivation of E. coli in stirred water in the dark and under UV-A/B irradiation. Results show that in addition to the bactericidal activity of TiO2 under UV-A illumination, under dark conditions, the decrease in bacteria viability is ascribed to mechanical stress due to stirring.

scholarly journals Enhanced Photocatalytic and Antibacterial Performance of ZnO Nanoparticles Prepared by an Efficient Thermolysis Method

Catalysts ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 608 ◽  
Author(s):  
Md. Hanif ◽  
Insup Lee ◽  
Jeasmin Akter ◽  
Md. Islam ◽  
Ali Zahid ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Zno Nanoparticles ◽  
Zinc Acetate Dihydrate ◽  
Hexagonal Wurtzite Structure ◽  
Thermal Method ◽  
X Ray Diffraction ◽  
Zno Nps ◽  
E Coli ◽  
Antibacterial Performance ◽  
Short Time

ZnO nanoparticles (ZnO-NPs) were synthesized by a straightforward modified thermal method using only one chemical: zinc acetate dihydrate. The process is environmentally safer than other methods because it does not involve other chemicals or a catalyst, acid, or base source. X-ray diffraction analysis indicated that the ZnO-NPs crystallize in the hexagonal wurtzite structure. The UV–vis absorption spectra revealed a marked redshift, which is critical for enhanced photocatalytic activity. We used methylene blue for photocatalytic activity tests and found an excellent degradation percentage (99.7%) within a short time (80 min). The antibacterial activity of the synthesized ZnO-NPs was tested against Escherichia coli at different concentrations of ZnO-NPs. The analysis revealed that the minimum inhibitory concentration (MIC) of the ZnO-NPs against E. coli was 30–50 μg/mL. Our ZnO-NPs were found to be more effective than previously reported ZnO-NPs synthesized via other methods.

Microwave Synthesis and Photocatalytic Activity of CeVO4 Nanocrystalline

2014 ◽  
Vol 1081 ◽  
pp. 146-150 ◽  
Author(s):  
Cong Sen Wang ◽  
Xiao Dong Chen ◽  
Xue Hong Liao
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Raw Materials ◽  
Layer Structure ◽  
Sodium Dodecyl ◽  
X Ray Diffraction ◽  
Methylene Orange ◽  
Degradation Ratio ◽  
Cerium Vanadate

Cerium vanadate nanocrystalline was prepared by cerium nitrate, vanadium (V) oxide as raw materials and sodium dodecyl sulfate as surfactant under microwave irradiation. The sample was characterized by X-ray diffraction (XRD) and scanning electron micrograph (SEM). The XRD show that the as-prepared sample calcined at 773 K is tetragonal zircon, and the SEM graph show that the as-prepared CeVO4nanocrystalline is layer structure formated of small particles aggregation. We studied the photocatalytic activity of the as-prepared samples by using degradation of methyl orange in visible light. It shows that the photocatalytic activity of Cerium vanadate nanocrystalline was very well. The effects of different factors such as calcination temperature and the concentration of methyl orange on the characterization of CeVO4are discussed. It found that when the catalyst calcined at 873 K was 0.10 g, and 0.3 mL hydrogen peroxide joined as well as, pH was 2.0, the degradation ratio of CeVO4for methylene orange of 100 mL 20 mg/L reached 87% in 80 min.

scholarly journals Facile Synthesis of Silver-salicylic acid (modified)/TiO2-nanotube/Ti plates for UV-light Promoted Dye Degradation

2019 ◽  
Vol 63 (2) ◽  
Author(s):  
Masoud Faraji ◽  
Ahmad Poursattar Marjani ◽  
Fatemeh Najafi
Keyword(s):  
Photocatalytic Activity ◽  
Salicylic Acid ◽  
Tio2 Nanotubes ◽  
Dye Degradation ◽  
Uv Light ◽  
Slow Electron ◽  
Oh Groups ◽  
Methylene Orange ◽  
Photodegradation Efficiency ◽  
Degradation Ratio

Abstract. Salicylic acid (mod)-Ag/TiO2NTs/Ti photocatalyst plates were prepared using chemical modification process of TiO2-nanotubes/Ti plates with salicylic acid and silver nanoparticles. Morphology studies exhibit that esterification between salicylic acid and -OH groups on TiO2 surface as well as deposition of Ag has been led to formation of uniform deposits on the walls of TiO2-nanotubes/Ti plates. The photocatalytic activity of the plates was tested on the degradation of Methylene Orange (MO) dye. The activity tests showed that the photodegradation efficiency for salicylic acid(mod)-Ag/TiO2NTs/Ti is higher than for Ag/TiO2NTs/Ti, salicylic acid(mod)/TiO2NTs/Ti and TiO2NTs/Ti plates, showing the integration the photocatalytic advantages of both Ag-TiO2 and salicylic acid-Mod-TiO2 composites. The modified plates can eliminate 96.6% of MO under UV light irradiation after 1 h, while can be recycled 4 times with 72.9% degradation ratio. Improved surface adsorption of MO, fast charge separation and slow electron-hole recombination are the main factors being responsible for the increase the photocatalytic activity of salicylic acid (mod)-Ag/TiO2-nanotubes/Ti plate. Resumen. Se prepararon placas de fotocatalizador de ácido salicílico (mod)-Ag/TiO2NTs/Ti, utilizando un proceso de modificación química de placas de nanotubos/TiO2-TiO2, con ácido salicílico y nanopartículas de plata. Los estudios morfológicos muestran que la esterificación entre el ácido salicílico y los grupos -OH en la superficie de TiO2, así como la deposición de Ag, ha llevado a la formación de depósitos uniformes en las paredes de las placas de nanotubos de TiO2/ Ti. La actividad fotocatalítica de las placas se probó en la degradación del colorante naranja de metileno (MO). Las pruebas de actividad mostraron que la eficiencia de fotodegradación para el ácido salicílico (mod)-Ag /TiO2NTs/Ti es mayor que para las placas Ag/TiO2NTs/Ti, ácido salicílico (mod)/TiO2NTs/Ti y TiO2NTs/Ti, mostrando la integración de las ventajas fotocatalíticas de los compuestos de Ag-TiO2 y ácido salicílico-Mod-TiO2. Las placas modificadas pueden eliminar el 96.6% del MO bajo la irradiación con luz UV después de 1 h, mientras que pueden reciclarse 4 veces con una relación de degradación del 72.9%. La mejora de la adsorción superficial de MO, la rápida separación de la carga y la lenta recombinación del hueco de electrones son los principales factores responsables del aumento de la actividad fotocatalítica del ácido salicílico (mod)-Ag/TiO2-nanotubos/placa de Ti.

The Study of NiO/TiO2 Photocatalytic Activity for Degradation of Methylene Orange

2014 ◽  
Vol 3 (4) ◽  
pp. 371-374 ◽  
Author(s):  
Lihua Chu ◽  
Meicheng Li ◽  
Peng Cui ◽  
Yongjian Jiang ◽  
Zipei Wan ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Methylene Orange

scholarly journals One Step Synthesis of Tetragonal-CuBi2O4/Amorphous-BiFeO3 Heterojunction with Improved Charge Separation and Enhanced Photocatalytic Properties

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1514
Author(s):  
Fang Cai ◽  
Ting Zhang ◽  
Qiong Liu ◽  
Pengran Guo ◽  
Yongqian Lei ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Solvothermal Method ◽  
Removal Rate ◽  
Cost Effective ◽  
Mild Conditions ◽  
Methylene Orange ◽  
Post Annealing ◽  
One Step ◽  
The One

Tetragonal CuBi2O4/amorphous BiFeO3 (T-CBO/A-BFO) composites are prepared via a one-step solvothermal method at mild conditions. The T-CBO/A-BFO composites show expanded visible light absorption, suppressed charge recombination, and consequently improved photocatalytic activity than T-CBO or A-BFO alone. The T-CBO/A-BFO with an optimal T-CBO to A-BFO ratio of 1:1 demonstrates the lowest photoluminescence signal and highest photocatalytic activity. It shows a removal rate of 78.3% for the photodegradation of methylene orange under visible light irradiation for 1 h. XPS test after the cycle test revealed the reduction of Bi3+ during the photocatalytic reaction. Moreover, the as prepared T-CBO/A-BFO show fundamentally higher photocatalytic activity than their calcinated counterparts. The one-step synthesis is completed within 30 min and does not require post annealing process, which may be easily applied for the fast and cost-effective preparation of photoactive metal oxide heterojunctions.

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