scholarly journals Enhancing the photocatalytic activity of Ag-TiO2/SiO2 and its potential application in water treatment

2021 ◽  
Vol 947 (1) ◽  
pp. 012016
Author(s):  
Thi-Ngoc-Suong Ho ◽  
Manh-Thang Ngo ◽  
Minh-Vien Le
Keyword(s):  
Water Treatment ◽  
Visible Light ◽  
Sol Gel ◽  
Light Response ◽  
Molar Ratio ◽  
Light Illumination ◽  
Visible Light Response ◽  
Visible Light Illumination ◽  
Photocatalytic Activities

Abstract Ag-doped TiO2/SiO2 with visible light response was prepared by a simple sol-gel method using titanium w-butoxide (TNB), tetraethoxysilane (TEOS) as precursors, and silver nitrate (AgNO3). The synthesized Ag-TiO2/SiO2 were characterized by SEM, XRD, PL (photoluminescence) emission and UV-Vis absorption spectroscopy. Their photocatalytic activities were evaluated by treating aqueous solutions of phenol under simulated visible light illumination. The role of silver doped was investigated in the range 1% – 5% (molar ratio), resulting in the best bandgap value of 2.93 eV for Ag(3%)-TiO2/SiO2 compared to 3,18 eV for the un-doped TiO2/SiO2. Consequently, the best phenol treating yield – about 97% after 4 hours – was obtained using Ag(3%)-TiO2/SiO2. So the synthesized Ag(3%)-TiO2/SiO2 might serve as a potential photocatalyst for water treatment using visible lights.

Simple fabrication and unprecedented visible light response of NiNb2O6/RGO heterojunctions for the degradation of emerging pollutants in water

2021 ◽  
Author(s):  
Filip Jones Benjamin Moses ◽  
Gcina Mamba ◽  
Sajid A Ansari ◽  
Maruthamani D. ◽  
Muthuraj Velluchamy ◽  
...  
Keyword(s):  
Water Treatment ◽  
Visible Light ◽  
Environmentally Friendly ◽  
Light Response ◽  
Catalytic Performance ◽  
Emerging Pollutants ◽  
Synthesis Methods ◽  
Visible Light Response ◽  
Effective Synthesis

Utilization of environmentally friendly and effective synthesis methods to fabricate visible light responsive photocatalyst with impressive catalytic performance is desirable in photocatalytic water treatment. Herein, we employed the powerful and...

scholarly journals Photocatalytic Improvement under Visible Light inTiO2Nanoparticles by Carbon Nanotube Incorporation

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Mathana Wongaree ◽  
Siriluk Chiarakorn ◽  
Surawut Chuangchote
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Sol Gel ◽  
Multiwall Carbon Nanotubes ◽  
High Specific Surface Area ◽  
Molar Ratio ◽  
Molar Ratios ◽  
Calcination Temperatures ◽  
Photocatalytic Activities ◽  
Multiwall Carbon

Photocatalytic activity ofTiO2nanoparticles was successfully enhanced by addition of multiwall carbon nanotubes (MWCNT) to make CNT/TiO2nanocomposites by sol-gel method at ambient temperature. CNT treated by HNO3 : H2SO4treatment (1 : 3 v/v) was mixed withTiO2nanoparticles at various molar ratios and calcination temperatures. The optimal molar ratio of CNT : TiO2was found at 0.05 : 1 by weight. The optimal calcination condition was 400°C for 3 h. From the results, the photocatalytic activities of CNT/TiO2nanocomposites were determined by the decolorization of 1 × 10−5 M methylene blue (MB) under visible light. CNT/TiO2nanocomposites could enhance the photocatalytic activity and showed faster for the degradation of MB with only 90 min. The degradation efficiency of the MB solution with CNT/TiO2nanocomposite achieved 70% which was higher than that with pristineTiO2(22%). This could be explained that CNT preventsTiO2from its agglomeration which could further enhance electron transfer in the composites. In addition, CNT/TiO2nanocomposites had high specific surface area (202 m2/g) which is very promising for utilization as a photocatalyst for environmental applications.

CoTiO3 Nanoparticles as a Highly Active Heterogeneous Catalyst of Peroxymonosulfate for the Degradation of Organic Pollutants under Visible-Light Illumination

2016 ◽  
Vol 42 ◽  
pp. 73-79
Author(s):  
Fang Li Chi ◽  
Guo Dong Zhou ◽  
Biao Song ◽  
Bin Yang ◽  
Yao Hui Lv ◽  
...  
Keyword(s):  
Visible Light ◽  
Organic Pollutants ◽  
Sol Gel ◽  
Average Diameter ◽  
Light Illumination ◽  
Visible Light Photocatalysis ◽  
Catalytic Activation ◽  
Highly Active ◽  
Visible Light Illumination ◽  
Activation Efficiency

Visible light responsive CoTiO3 nanoparticles with average diameter of 100 nm were successfully synthesized by sol-gel method and were firstly applied to catalytic activation of peroxymonosulfate (PMS) for degradation of organic pollutants (Rhodamine B (RhB)). Photocatalytic experiments illustrated that CoTiO3 nanoparticles reveal good photocatalytic activity and excellent ability to activate PMS, the synergistic effect of visible light photocatalysis and sulfate radical generated from activated PMS can degradate RhB efficiently. Besides, CoTiO3 nanoparticles maintain their high photocatalytic and activation efficiency after three times recycling.

scholarly journals Preparation and Property of Mo-Doped Visible-Light Response Titaniumdioxide Photocatalyst

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Yingying Li ◽  
Xianliang Song ◽  
Zhedong Wei ◽  
Jianguang Zhang ◽  
Lijuan Qin ◽  
...  
Keyword(s):  
Visible Light ◽  
Crystal Lattice ◽  
Raw Materials ◽  
Light Response ◽  
Ammonium Molybdate ◽  
Electron Hole ◽  
Degradation Study ◽  
Visible Light Response ◽  
Photocatalytic Activities ◽  
Visible Light Photocatalytic

Mo-titaniumdioxide (P25) photocatalyst with visible-light response was prepared with the ammonium molybdate for Mo source and titaniumdioxide for the raw materials by the method of dissolving and calcining. The photocatalysts’ structure was characterized by XRD, XPS, and UV-Vis absorption spectrum and TEM. The photocatalytic activities of Mo-titaniumdioxide were measured by the degradation of methylene blue (MB) under visible-light irradiation. The results showed that Mo characteristic peaks appeared at the point of 235.45 eV, 234.2 eV, 232.3 eV, and 231.1 eV. In Mo-titaniumdioxide crystal lattice, Mo6+had the highest percentage (about 84.08%), indicating that Mo element was inserted into titaniumdioxide crystal lattice and considerable amount of Mo dopant was in the 6+ valence state, which restrained the recombination of electron-hole and had the visible-light photocatalytic activity. Photocatalytic degradation study indicated that the samples prepared at calcination temperature of 500°C were used to degrade MB; after 3 h, the degradation reached up to 80.67%.

Metal ion and N co-doped TiO2 as a visible-light photocatalyst

2004 ◽  
Vol 19 (7) ◽  
pp. 2100-2108 ◽  
Author(s):  
Yoshiaki Sakatani ◽  
Hiroyuki Ando ◽  
Kensen Okusako ◽  
Hironobu Koike ◽  
Jun Nunoshige ◽  
...  
Keyword(s):  
Visible Light ◽  
Photoelectron Spectroscopy ◽  
Metal Ion ◽  
Light Response ◽  
Complex Method ◽  
Visible Light Photocatalyst ◽  
X Ray ◽  
Visible Light Response ◽  
Spin Resonance ◽  
Photocatalytic Activities

Powders of TiO2 doped with a metal ion and N species were prepared by a polymerized complex method and the visible-light photocatalytic activities of the products are investigated. Of the metal ions studied (K+, Ca2+, Sr2+, Ba2+, Nb5+, Fe3+, Zn2+, and Al3+), the photocatalyst prepared with Sr2+ exhibits the highest activity for acetaldehyde decomposition under visible-light irradiation. Results obtained from x-ray photoelectron spectroscopy (XPS) and electron spin resonance (ESR) analyses suggest that the doped N species reside at interstitial lattice positions in the catalyst. It was also found by XPS and ESR measurements that the doped N species combine with lattice oxygen to give rise to a paramagnetic property. The visible-light response of the catalyst is driven by the formation of paramagnetic N species at interstitial positions in the TiO2 lattice.

Multifunctional superhydrophobic sol with visible light response and its application in water treatment

2022 ◽  
Vol 162 ◽  
pp. 110532
Author(s):  
Yongle Zhang ◽  
Lijun Dong ◽  
Yan Li ◽  
Xiangcai Ge ◽  
Guina Ren ◽  
...  
Keyword(s):  
Water Treatment ◽  
Visible Light ◽  
Light Response ◽  
Visible Light Response
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