scholarly journals Synthesis of Titanium Containing SBA-15 and Its Application for Photocatalytic Degradation of Phenol

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Lili Yang ◽  
Zeyu Jiang ◽  
Sufeng Lai ◽  
Chongwen Jiang ◽  
Hong Zhong
Keyword(s):  
Waste Water ◽  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Physicochemical Properties ◽  
Phenol Degradation ◽  
Titanium Content ◽  
Structure Change ◽  
Cyclic Performance ◽  
One Pot ◽  
Simulated Waste

We synthesized Ti-containing SBA-15 by one-pot hydrothermal method and extensively investigated its physicochemical properties and examined its photocatalytic activity to degrade phenol. It’s shown that appropriate amount of titanium could be effectively incorporated into the framework of SBA-15 without provoking structure change and the tetrahedrally coordinated titanium species were well-ordered in Ti-incorporated SBA-15. Under UV-irradiation, the Ti-containing SBA-15 exhibits good photocatalytic activity for phenol degradation in the simulated waste water. The higher photocatalytic activity of Ti-containing SBA-15 to degrade phenol was ascribed to the more titanium content and anatase titanium dioxide. In addition, the new photocatalyst displays a good regeneration and cyclic performance after six runs.

One-pot synthesis of a TiO2–CdS nano-heterostructure assembly with enhanced photocatalytic activity

RSC Advances ◽  
2015 ◽  
Vol 5 (44) ◽  
pp. 34942-34948 ◽  
Author(s):  
Sayantan Mazumdar ◽  
Aninda J. Bhattacharyya
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Cadmium Sulfide ◽  
Self Assembly ◽  
Cost Effective ◽  
One Pot ◽  
One Pot Synthesis ◽  
Cost Effective Method

An unprecedented morphology of a titanium dioxide (TiO2) and cadmium sulfide (CdS) self-assembly obtained using a ‘truly’ one-pot and highly cost effective method with a multi-gram scale yield is reported here.

scholarly journals Activity Enhancement of P25 Titanium Dioxide by Zinc Oxide for Photocatalytic Phenol Degradation

2021 ◽  
Vol 16 (2) ◽  
pp. 310-319
Author(s):  
Yehezkiel Steven Kurniawan ◽  
Leny Yuliati
Keyword(s):  
Zinc Oxide ◽  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Rate Constant ◽  
Phenol Degradation ◽  
Reaction Rate Constant ◽  
X Ray Diffraction ◽  
Physical Mixing ◽  
Mixing Method ◽  
Activity Enhancement

As a benchmark photocatalyst, P25 titanium dioxide (TiO2) nanomaterial has been widely reported for its remarkable photocatalytic activity under ultraviolet (UV) irradiation. However, approaches to further improve the photocatalytic activity of the P25 TiO2 are still required. In the present work, we reported the activity enhancement of the P25 TiO2 up to more than five times higher rate constant for phenol degradation when the P25 TiO2 was coupled with zinc oxide (ZnO). The composites were prepared by a physical mixing method of P25 TiO2 and ZnO with various weight ratios of 1:0.5, 1:1, and 1:2. The composite materials were then characterized using X-ray diffraction (XRD), diffuse-reflectance ultraviolet-visible (DR UV-vis), Fourier transform infrared (FTIR), and fluorescence spectroscopies. All the composites gave better activity than the P25 TiO2, in which the TiO2/ZnO 1:1 composite material exhibited the highest first-order reaction rate constant (0.43 h−1). This remarkable enhanced degradation rate was much higher than that of the unmodified TiO2 (0.08 h−1) and ZnO (0.13 h-1). The fluorescence study revealed that the electron-hole recombination on the P25 TiO2 could be suppressed by the ZnO, which would be the reason for such activity enhancement. A study on the effect of the scavenger showed that the hydroxyl radicals played a crucial role in the photocatalytic phenol degradation. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 

scholarly journals Photocatalytic degradation of Phenol, Catechol and Hydroquinone over Au-ZnO nanomaterials

2019 ◽  
pp. 24-32
Author(s):  
Julie Joseane Murcia Mesa ◽  
Jonny Alberto García Arias ◽  
Hugo Alfonso Rojas Sarmiento ◽  
Oswaldo Eliecer Cárdenas González
Keyword(s):  
Photocatalytic Activity ◽  
Phenolic Compounds ◽  
Physicochemical Properties ◽  
Catalytic Reaction ◽  
Phenol Degradation ◽  
Visible Region ◽  
Electromagnetic Spectrum ◽  
Zno Nanomaterials ◽  
Target Molecules ◽  
Uv Visible

Au-ZnO nanomaterials were tested in photodegradation reactions performed under UV-Visible light; Phenol,  Catechol and Hydroquinone were selected as target molecules, and it was found that Hydroquinone is the most sensitive molecule to be degraded under illumination. The Au addition significantly increases the photocatalytic activity of ZnO in the degradation of the phenolic compounds and the Au content is an important factor influencing the physicochemical properties of the nanomaterials synthesized and therefore the effectiveness of the photocatalytic treatment. The highest effectiveness in the phenolic compounds elimination was achieved by using ZnO modified by the addition of 2 wt.% of gold, this is due to the highest absorption of this material in the visible region of the electromagnetic spectrum. By HPLC analyzes, it was determined that the degradation route of the phenolic compounds depends on the photocatalyst employed in the catalytic reaction and on the substrate to be degraded, thus, Phenol degradation takes place by formation of more intermediate compounds than the observed in Catechol or Hydroquinone photodegradation.

Photodegradation of Oily Waste Water Using Nano-TiO2

2011 ◽  
Vol 332-334 ◽  
pp. 2153-2156
Author(s):  
Zong Wei Zhang ◽  
Chuang Zhang
Keyword(s):  
Waste Water ◽  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Sol Gel ◽  
Oily Wastewater ◽  
Tio2 Powder ◽  
Nano Tio2 ◽  
Photo Degradation ◽  
Photo Oxidation ◽  
Oily Waste

Photocatalytic degradation of oily wastewater using Nano-TiO2 was studied.First Nano-TiO2 powder with photocatalytic activity were prepared by sol-gel progress.Second the photo-degradation of oily wastewater on titanium dioxide was investigated.The reaction also features the photocatalytic activity of Nano-TiO2. Finally, the mechanisms of photo-oxidation were discussed.

scholarly journals Synthesis and Photocatalytic Activity of TiO2 on Phenol Degradation

2021 ◽  
Author(s):  
Muhamad D. Permana ◽  
◽  
Atiek R. Noviyanti ◽  
Putri R. Lestari ◽  
Nobuhiro Kumada ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Band Gap ◽  
Crystallite Size ◽  
Titanium Dioxide Nanoparticles ◽  
Sol Gel ◽  
Phenol Degradation ◽  
High Catalytic Activity ◽  
Titanium Tetraisopropoxide ◽  
Titanium Butoxide

Photocatalysis is a process of accelerating reactions that are assisted by energy from light irradiation. Titanium dioxide (TiO2) is one of the most widely developed photocatalysis materials, and is used because of its high catalytic activity, stability and very affordable. The most commonly used precursors of TiO2 are titanium butoxide (TBOT) and titanium tetraisopropoxide (TTIP). These variations in precursor can lead to phase difference in the formation of TiO2 crystals, which further improves its nature in the activity of photocatalysis. In this study, the sol-gel method was used to synthesize titanium dioxide nanoparticles from variations of TBOT and TTIP. Furthermore, the structure, crystallite size and band gap of TiO2 were determined by X-ray diffraction (XRD) and UV-vis reflectance spectroscopy (DRS). Subsequently, TiO2 photocatalytic activity was evaluated in phenol photodegradation as a contaminant model with UV irradiation. The results showed the structure synthesized from TBOT had a higher amount of anatase, higher crystallinity, smaller crystallite size, larger band gap, and better photocatalytic activity than those from TTIP. Furthermore, it was shown that TiO2 from TBOT had an efficiency of 147% greater than TiO2 P25 Degussa, while TiO2 from TTIP had 66% efficiency compared to TiO2 P25.

Preparation and Photocatalytic Activity of Titanium Dioxide-organosilicone-Heteropolyacid Photocatalysts

2014 ◽  
Vol 1015 ◽  
pp. 488-491
Author(s):  
Ming Jun Piao ◽  
Jia Ting Feng ◽  
Qian Nan Li ◽  
Sheng Nan Li ◽  
Xiao Ke Han ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Rhodamine B ◽  
Triblock Copolymer ◽  
Hybrid Structure ◽  
X Ray Diffraction ◽  
One Pot ◽  
X Ray ◽  
Ft Ir ◽  
Triblock Copolymer Surfactant

TiO2-organosilicone based hybrid catalysts functioned by Keggin-type heteropolyacid, TiO2-Si (Et)Si-H3PW12O40, were prepared via one-pot co-condensation method in the presence of a triblock copolymer surfactant (F127). The materials were well characterized by FT-IR, UV-vis DRS spectroscopy methods, and X-ray diffraction analysis to confirm the hybrid structure, to investigate correlation among TiO2-organosilicone matrix and H3PW12O40. Phtocatalytic tests show that, with a little amount of organosilicone and hybridization, the composite exhibits higher photocatalytic activity when decomposing the Rhodamine B ( RhB ) than anatase TiO2.

Comparison of Photocatalytic Activities of Commercial Titanium Dioxide Powders Immobilised on Glass Substrates

2010 ◽  
Vol 13 (1) ◽  
Author(s):  
Patrick S. M. Dunlop ◽  
Americo Galdi ◽  
Trudy A. McMurray ◽  
Jeremy W. J. Hamilton ◽  
Luigi Rizzo ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Formic Acid ◽  
Parent Compound ◽  
Phenol Degradation ◽  
Spray Coating ◽  
Dip Coating ◽  
Catalyst Loading ◽  
Experimental Conditions ◽  
Wide Range

AbstractSemiconductor photocatalysis is an advanced oxidation technology reported to be effective for the degradation of a wide range of organic pollutants found in water. Titanium dioxide is the most suitable photocatalyst for water treatment as it is insoluble under normal pH conditions, is photoactive, photostable, readily available and inexpensive. In this work Millennium Chemicals PC500, PC105, PC100, PC50, PC10 and Evonik Degussa P25 powders were immobilised onto borosilicate glass, via dip-coating and spray coating, producing thick films ranging from 0.2 to 1.4 mg catalyst per square cm of glass substrate. The photocatalytic activity of the immobilised films was compared under back-face UVA irradiation in a stirred-tank reactor using formic acid and phenol as model pollutants. Based upon the rate constant derived from the removal of the parent compound, and using the optimum catalyst loading determined under the experimental conditions employed, the order of photocatalytic activity for the degradation of formic acid was found to be P25 > PC100 > PC50 > PC105 ≥ PC500 > PC10, while for phenol degradation the order was P25 > PC50 > PC105 > PC100 ≥ PC500 > PC10.

Endurance Test of TiO2-Based Photocatalytic Oxidation

1998 ◽  
Vol 3 (2) ◽  
Author(s):  
J. W. Assink ◽  
J. M. Slaager
Keyword(s):  
Waste Water ◽  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Physical Model ◽  
Photocatalytic Oxidation ◽  
Acid Dye ◽  
Endurance Test ◽  
Endurance Tests ◽  
Degussa P25

AbstractThe long term behaviour of suspended photocatalysts (Degussa P25) is studied in two endurance tests. Model waste water with an acid dye (Special Brilliant Blue FFR) or 4-chlorophenol as main contaminant have been used. Titanium dioxide is recovered from the effluent by pressure filtration and reused in the feed. A change in suspension behaviour of the titanium dioxide was observed over the period of the endurance tests (approx. 400 h). The photocatalytic activity decreased in the same period by approx. 55 % in the case of chlorophenol and approx. 25 % in the case of the dye. Intermediates from the chlorophenol degradation have been identified. The result of the tests are fitted to a physical model of the process. They are also useful for improved reactor design

Preparation and Photocatalytic Activity of Heteropolyacid Supported on Titanium Dioxide Photocatalysts

2012 ◽  
Vol 610-613 ◽  
pp. 68-71
Author(s):  
Ming Jun Piao ◽  
Kai Xu ◽  
Jiang Lei Hu ◽  
Long Zhang
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Hybrid Materials ◽  
Triblock Copolymer ◽  
Structural Integrity ◽  
X Ray Diffraction ◽  
One Pot ◽  
X Ray ◽  
Ft Ir ◽  
Triblock Copolymer Surfactant

TiO2-based hybrid catalysts functioned by Keggin-type heteropolyacid, H3PW12O40/ TiO2, were prepared via one-pot co-condensation method in the presence of a triblock copolymer surfactant (F127). The materials were well characterized by FT-IR, UV-vis DRS spectroscopy methods, and X-ray diffraction analysis to confirm the structural integrity of the Keggin unit in the hybrid materials, to investigate correlation between TiO2 matrix and H3PW12O40. Phtocatalytic tests show the composite exhibits higher photocatalytic activity to decompose the Rhodamine B ( RhB ) than anatase TiO2.

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