Synthesis and photocatalytic activity of anatase TiO2 nanoparticles for degradation of methyl orange

In this study, functionalized-MWCNTs with 3-aminopropyltriethoxysilane (APTES) loaded titania nanoparticles (MWCNTs-APTES-TiO2) were prepared to investigate their physicochemical properties and photocatalytic activity for methyl orange (MO) degradation. The TiO2 nanoparticles, functionalized-MNCNT and composite powders were characterized by XRD, raman, and TEM. The results obtained proved that titania (TiO2) nanoparticles was successfully loaded on APTES-MWCNTs. The best photocatalytic degradation of methyl orange solution under UV light irradiation was recorded over MWCNTs-APTES-TiO2 (1:2), with 87% after 180 min. Kinetic analysis indicated that photocatalytic degradation of MO solution by MWCNTs-APTES-TiO2 obeyed second-order kinetic model (R2 > 0.95), supported by half-life equations and graph. The presence of carbon nanotubes accelerated the degradation of methyl orange due to inhibition of electron-hole recombination, the formation of additional hydroxyl radicals and functional groups of the latter had an inhibitory effect on the degradation of methyl orange. This study shows that the MWCNTs-APTES-TiO2 nanocomposites exhibit promising photocatalytic degradation against methyl orange.

Download Full-text

Enhanced photocatalytic activity of (Mo, C)-codoped anatase TiO2 nanoparticles for degradation of methyl orange under simulated solar irradiation

Journal of Materials Research ◽

10.1557/jmr.2010.0307 ◽

2010 ◽

Vol 25 (12) ◽

pp. 2392-2400 ◽

Cited By ~ 37

Author(s):

Pengyu Dong ◽

Bin Liu ◽

Yuhua Wang ◽

Huanhuan Pei ◽

Shu Yin

Keyword(s):

Photocatalytic Activity ◽

Methyl Orange ◽

Energy Gap ◽

Adsorption Property ◽

Sol Gel ◽

Anatase Tio2 ◽

Solar Irradiation ◽

Sol Gel Process ◽

Simulated Solar Irradiation ◽

Degradation Of Methyl Orange

C-doped, Mo-doped, and (Mo, C)-codoped TiO2 photocatalysts were prepared by a sol-gel process. The photocatalytic activity was evaluated by the photocatalytic degradation of methyl orange (MO) under simulated solar irradiation. Results indicated that both monodoped and codoped TiO2 exhibited better visible light absorption behavior and narrower energy gap than pure TiO2, and codoped TiO2 showed a slightly higher adsorption property in the dark because of higher Brunauer–Emmett–Teller-specific surface area. The photocatalytic activity of monodoped TiO2 was also enhanced, and the (0.04% Mo, C)-codoped sample had the best photocatalytic activity for degrading MO among all of the samples. The reason can be ascribed to the synergistic effect due to Mo and C doping. Furthermore, the transfer pathways of photoinduced carriers and photocatalytic reaction mechanism of (Mo, C)-codoped TiO2 was first investigated.

Download Full-text

Sol–gel microwave assisted synthesis of Sm-doped TiO2 nanoparticles and their photocatalytic activity for the degradation of Methyl Orange under sunlight

Journal of Materials Science Materials in Electronics ◽

10.1007/s10854-016-4581-7 ◽

2016 ◽

Vol 27 (6) ◽

pp. 6425-6432 ◽

Cited By ~ 6

Author(s):

G. V. Khade ◽

M. B. Suwarnkar ◽

N. L. Gavade ◽

K. M. Garadkar

Keyword(s):

Photocatalytic Activity ◽

Methyl Orange ◽

Tio2 Nanoparticles ◽

Sol Gel ◽

Microwave Assisted Synthesis ◽

Doped Tio2 ◽

Microwave Assisted ◽

Degradation Of Methyl Orange

Download Full-text

Effect of Samarium on the Photocatalytic Property of Sm-TiO2/CNFs Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.79-82.541 ◽

2009 ◽

Vol 79-82 ◽

pp. 541-544 ◽

Cited By ~ 1

Author(s):

Li Ying Zhu ◽

Xiao Ping Yang ◽

Dong Hua Teng ◽

Yun Hua Yu

Keyword(s):

Aqueous Solution ◽

Photocatalytic Activity ◽

Methyl Orange ◽

Photocatalytic Degradation ◽

Tio2 Nanoparticles ◽

Carbon Nanofibers ◽

Uv Irradiation ◽

Photocatalytic Property ◽

Uniform Size ◽

Degradation Of Methyl Orange

Composites of Sm doped TiO2 nanoparticles dispersed on carbon nanofibers (Sm-TiO2/CNFs) with different Sm contents were prepared by preoxidation, hydrolyzation and calcination of Sm-TiO2 precursor/PAN nanofibers. The characterizations of SEM, EDX, XPS and XRD showed that the CNFs surface was loaded by Sm-TiO2 nanoparticles with a uniform size of about 10nm, existing as anatase. It was concluded from XPS results that Ti element exist as Ti4+ and Sm doping increased the content of absorbed oxygen in composites. The effect of Sm doping on the photocatalytic activity of the Sm-TiO2/CNFs composite was investigated by the photocatalytic degradation of methyl orange aqueous solution under UV irradiation. It was found that Sm doping could improve the photocatalytic property of Sm-TiO2/CNFs effectively compared with the undoped specimen, and the photocatalytic activity of the Sm-TiO2/CNFs samples enhanced firstly and then reduced with Sm content increasing.

Download Full-text