scholarly journals Photocatalytic removal of 2,4-dichlorophenoxyacetic acid herbicide on copper oxide/titanium dioxide prepared by co-precipitation method

2016 ◽  
Vol 107 ◽  
pp. 012012 ◽  
Author(s):  
Shu Chin Lee ◽  
Norhasnita Hasan ◽  
Hendrik O. Lintang ◽  
Mustaffa Shamsuddin ◽  
Leny Yuliati
Keyword(s):  
Titanium Dioxide ◽  
Copper Oxide ◽  
Precipitation Method ◽  
Dichlorophenoxyacetic Acid ◽  
Photocatalytic Removal ◽  
Co Precipitation ◽  
2,4 Dichlorophenoxyacetic Acid

scholarly journals Synthesis and characterization of gold nanoparticles on titanium dioxide for the catalytic photodegradation of 2,4-dichlorophenoxyacetic acid

2018 ◽  
Vol 16 (5) ◽  
Author(s):  
E. Romero Torres ◽  
M. Gutiérrez Arzaluz ◽  
V Mugica Alvarez ◽  
L. González Reyes ◽  
M. Torres Rodríguez ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Titanium Dioxide ◽  
Uv Light ◽  
Anatase Phase ◽  
Precipitation Method ◽  
Dichlorophenoxyacetic Acid ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Average Size ◽  
2,4 Dichlorophenoxyacetic Acid

The photocatalytic degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) using a Au/TiO2 catalyst and ultraviolet (UV) light energy source (9 mW/cm2) discussed. Gold nanoparticles were synthesized by controlled urea reduction and deposited on titanium dioxide (TiO2) by the deposition-precipitation method. The average size of the nanoparticles was 6-8 nm. X-ray diffraction (XRD) characterization confirmed that TiO2 was present in the anatase phase, whereas the presence and particle size of gold were determined by transmission electron microscopy (TEM). The results of the degradation showed that the activity of TiO2 was improved when Au nanoparticles were present on the surface. The reactions were performed at atmospheric pressure and room temperature.

scholarly journals Photocatalytic removal of nitric oxide by Bi2Mo3O12 prepared by co-precipitation method

2013 ◽  
Vol 468 ◽  
pp. 322-326 ◽  
Author(s):  
E. Luévano-Hipólito ◽  
A. Martínez-de la Cruz ◽  
Q.L. Yu ◽  
H.J.H. Brouwers
Keyword(s):  
Nitric Oxide ◽  
Precipitation Method ◽  
Photocatalytic Removal ◽  
Co Precipitation

scholarly journals Cobalt Oxide-Modified Titanium Dioxide Nanoparticle Photocatalyst for Degradation of 2,4-Dichlorophenoxyacetic Acid

2017 ◽  
Vol 17 (2) ◽  
pp. 284 ◽  
Author(s):  
Leny Yuliati ◽  
Nur Azmina Roslan ◽  
Wai Ruu Siah ◽  
Hendrik Oktendy Lintang
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Cobalt Oxide ◽  
Uv Light ◽  
Dichlorophenoxyacetic Acid ◽  
Photocatalytic Reaction ◽  
Impregnation Method ◽  
Titanium Dioxide Nanoparticle ◽  
2,4 Dichlorophenoxyacetic Acid

2,4-dichlorophenoxyacetic acid (2,4-D) has been recognized as a possibly carcinogenic compound to human, therefore, 2,4-D should be treated before it is discharged to the environment. Photocatalytic degradation of 2,4-D has been proposed as one of the best methods that offer environmentally safe process. In the present research, titanium dioxide (TiO2) was modified with cobalt oxide (CoO) and tested for photocatalytic degradation of 2,4-D under UV light irradiation. Different amounts of CoO (0.1, 0.5, 1 and 5 mol%) were added onto TiO2 by an impregnation method. The photocatalytic reaction was monitored and analyzed by measurement of 2,4-D absorbance using UV spectrophotometer. After 1 h photocatalytic reaction, it was confirmed that the sample with low loading of 0.1 mol% gave the highest photocatalytic activity among the bare and modified TiO2 photocatalysts. The photocatalytic activity was decreased with the increase of CoO loading, suggesting that the optimum amount of CoO was an important factor to improve the performance of TiO2. Based on fluorescence spectroscopy, such addition of CoO resulted in the reduced emission intensity, which showed the successful decrease in the electron-hole recombination.

Photocatalytic Destruction of Methyl Orange by Titanium Dioxide Powder Synthesized by an Oxalate Co-Precipitation Method

2010 ◽  
Vol 93-94 ◽  
pp. 320-323
Author(s):  
Pusit Pookmanee ◽  
Sirion Angkana ◽  
Sukon Phanichphant
Keyword(s):  
Titanium Dioxide ◽  
Methyl Orange ◽  
Ammonium Hydroxide ◽  
Titanium Isopropoxide ◽  
Precipitation Method ◽  
Rutile Structure ◽  
Titanium Dioxide Powder ◽  
Dioxide Powder ◽  
Photocatalytic Destruction ◽  
Co Precipitation

Titanium dioxide powder was synthesized by an oxalate co-precipitation method with titanium isopropoxide and oxalic acid as the starting precursors. White precipitate was obtained after adding ammonium hydroxide until the final pH of solution was 8 and then calcined at 400-800 °C for 2h. The phase was characterized by X-ray diffraction. Single phase anatase structure was obtained after calcination at 400 °C. Multi-phase of anatase and rutile structure was obtained after calcined at 600 and 800 °C. The morphology was investigated by scanning electron microscopy. The particle was irregular in shape and highly agglomerate with a range of particle size from 0.1-0.3 µm. The photocatalytic destruction of methyl orange by titanium dioxide was determined by Ultraviolet spectrophotometry. Titanium dioxide powder synthesized by an oxalate co-precipitation method after calcination at 800 °C showed the highest photocatalytic activity.

On the Role of NaCl Addition to Phase Transformation of TiO2 from TiCl3

2015 ◽  
Vol 1112 ◽  
pp. 313-316 ◽  
Author(s):  
Irana Eka Putri ◽  
Herny Ariesta Budiarti ◽  
Dyah Sawitri ◽  
Doty D. Risanti
Keyword(s):  
Phase Transformation ◽  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Rutile Phase ◽  
The Other ◽  
Precipitation Method ◽  
Control Solution ◽  
Key Points ◽  
Co Precipitation

Phase transformation of TiO2 (titanium dioxide) nanoparticles has been analyzed by observing the effect of NaCl addition to the anatase-to-rutile phase transformation. NaCl is one of key points in the transformation of rutile. Co-precipitation method was employed in which TiCl3 as precursor was reacted with HCl 2M and subsequent NH4OH. Three methods were studied, namely solution without NaCl addition (TiCl3 + HCl + NH4OH) as control solution subjected to route A (TiCl3 + HCl – NaCl– NH4OH – heated at 600°C for 5 hours) and route B (TiCl3 + NaCl – heated 200°C for 5 hours – NH4OH – heated 200°C for 6 hours). Route B was subjected to heating at 200°C. The results show that without NaCl it enhanced the crystal growth of the rutile embryos allowing the ease of rutile formation at 600°C, while route A promoted the transformation of brookite and hindered anatase-to-rutile transformation as indicated by the presence of anatase at 1000°C. On the other hand route B is potential for being further explored.

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