Synthesis of lanthanide-doped TiO2 nanoparticles and their photocatalytic activity under visible light

2019 ◽  
Vol 97 (9) ◽  
pp. 672-681 ◽  
Author(s):  
Vuyolwethu O. Ndabankulu ◽  
Suresh Maddila ◽  
Sreekantha B. Jonnalagadda
Keyword(s):  
Photocatalytic Activity ◽  
Catalytic Activity ◽  
Visible Light ◽  
Sol Gel ◽  
Analytical Techniques ◽  
The Other ◽  
Carbamic Acid ◽  
Light Illumination ◽  
Visible Light Illumination ◽  
Synthesized Materials

Four different lanthanide (Ce, Dy, Lu, and Sm) doped TiO2 mesoporous materials were synthesised using the sol–gel method with titanium (IV) isopropoxide as the precursor. All of the synthesized materials were characterised using different analytical techniques, BET, PXRD, TEM, SEM-EDX, Raman, FTIR, photoluminescence, and UV-DRS spectroscopy. Photocatalytic activity and efficacy of the materials in the degradation of caffeine in aqueous solutions was investigated under visible light illumination. Although all materials showed good photocatalytic activity, Ce-doped TiO2 exhibited relatively better activity than the other three catalysts. High photoactivity of the catalysts was attributed to the presence of lanthanides and their ability to generate ions that scavenge electrons under visible light, thereby enhancing photodegradation of caffeine. All materials proved to be good and were recyclable without loss of catalytic activity up to three runs. An intermediate [N-1,3,6-trimethyl-2,4-dioxo-1,2,3,4-tetrahydropyrimidin-5-yl)formamide] (TDTF) and two products (6-amino-1,3-dimethyl-2,4-dioxo-1,2,3,4-tetrahydropymidin-5-ly)-(methyl)-carbamic acid (ATCA) and N-methyl-N-(methylcarbomoyl)-2-oxoacetamide (MMO) were identified by the LC–MS spectra.

scholarly journals Sulfur-, nitrogen- and platinum-doped titania thin films with high catalytic efficiency under visible-light illumination

2018 ◽  
Vol 9 ◽  
pp. 1629-1640 ◽  
Author(s):  
Boštjan Žener ◽  
Lev Matoh ◽  
Giorgio Carraro ◽  
Bojan Miljević ◽  
Romana Cerc Korošec
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Sol Gel ◽  
Catalytic Efficiency ◽  
Dip Coating ◽  
Light Illumination ◽  
Organic Pigment ◽  
Visible Light Illumination ◽  
Doped Titania

Titanium dioxide photocatalysts have received a lot of attention during the past decades due to their ability to degrade various organic pollutants to CO2 and H2O, which makes them suitable for use in environmental related fields such as air and water treatment and self-cleaning surfaces. In this work, titania thin films and powders were prepared by a particulate sol–gel route, using titanium tetrachloride (TiCl4) as a precursor. Afterwards, the prepared sols were doped with nitrogen (ammonium nitrate, urea), sulfur (thiourea) and platinum (chloroplatinic acid), coated onto glass substrates by dip-coating, and thermally treated in a muffle furnace to promote crystallization. The resulting thin films were then characterized by various techniques (i.e., TGA-DSC-MS, XRD, BET, XPS, SEM, band gap measurements). The photocatalytic activity of the prepared thin films was determined by measuring the degradation rate of plasmocorinth B (PB), an organic pigment used in the textile industry, which can pose an environmental risk when expelled into wastewater. A kinetic model for adsorption and subsequent degradation was used to fit the experimental data. The results have shown an increase in photocatalytic activity under visible-light illumination of nonmetal and metal doped and co-doped titania thin films compared to an undoped sample.

scholarly journals Enhanced Visible-Light Photocatalytic Performance of SAPO-5-Based g-C3N4 Composite for Rhodamine B (RhB) Degradation

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3948
Author(s):  
Lingfang Qiu ◽  
Zhiwei Zhou ◽  
Mengfan Ma ◽  
Ping Li ◽  
Jinyong Lu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Redox Reactions ◽  
Photocatalytic Performance ◽  
Dye Degradation ◽  
Thermal Polymerization ◽  
Light Illumination ◽  
Electron Hole ◽  
Visible Light Illumination ◽  
Visible Light Photocatalytic

Novel visible-light responded aluminosilicophosphate-5 (SAPO-5)/g-C3N4 composite has been easily constructed by thermal polymerization for the mixture of SAPO-5, NH4Cl, and dicyandiamide. The photocatalytic activity of SAPO-5/g-C3N4 is evaluated by degrading RhB (30 mg/L) under visible light illumination (λ > 420 nm). The effects of SAPO-5 incorporation proportion and initial RhB concentration on the photocatalytic performance have been discussed in detail. The optimized SAPO-5/g-C3N4 composite shows promising degradation efficiency which is 40.6% higher than that of pure g-C3N4. The degradation rate improves from 0.007 min−1 to 0.022 min−1, which is a comparable photocatalytic performance compared with other g-C3N4-based heterojunctions for dye degradation. The migration of photo-induced electrons from g-C3N4 to the Al site of SAPO-5 should promote the photo-induced electron-hole pairs separation rate of g-C3N4 efficiently. Furthermore, the redox reactions for RhB degradation occur on the photo-induced holes in the g-C3N4 and Al sites in SAPO-5, respectively. This achievement not only improves the photocatalytic activity of g-C3N4 efficiently, but also broadens the application of SAPOs in the photocatalytic field.

Ultrathin CdS shell-sensitized hollow S-doped CeO2 spheres for efficient visible-light photocatalysis

2019 ◽  
Vol 9 (6) ◽  
pp. 1357-1364 ◽  
Author(s):  
Ning-Chao Zheng ◽  
Ting Ouyang ◽  
Yibo Chen ◽  
Zhu Wang ◽  
Di-Yun Chen ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Shell Structure ◽  
Evolution Rate ◽  
Light Illumination ◽  
Visible Light Photocatalysis ◽  
Visible Light Illumination ◽  
Excellent Photocatalytic Activity ◽  
Systematic Effects ◽  
Doped Ceo2

By virtue of the systematic effects of S-doping on CeO2 and the ultrathin shell structure of CdS, the CeO2−xSx@CdS nanocomposite exhibits excellent photocatalytic activity under visible-light illumination for both H2 evolution (rate up to 1147.2 μmol g−1 h−1) and RhB degradation (efficiency reached 99.8%) as compared to CeO2, CeO2−xSx, and CdS.

Hollow BiVO4/Bi2S3 cruciate heterostructures with enhanced visible-light photoactivity

2019 ◽  
Vol 9 (1) ◽  
pp. 182-187 ◽  
Author(s):  
Chen Zhuang ◽  
Lanqin Tang ◽  
Zhentao Yu ◽  
Tianxiao Peng ◽  
Yongcai Zhang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Anion Exchange ◽  
Light Illumination ◽  
Photocurrent Response ◽  
Exchange Reactions ◽  
Visible Light Illumination

Unique BiVO4/Bi2S3 cruciate hollow heterostructures are successfully constructed via anion exchange reactions using cruciate BiVO4 as templates and precursors. The hollow heterostructures exhibit excellent enhanced photocurrent response and photocatalytic activity for reduction of Cr6+ under visible-light illumination.

Novel mesoporous NiO/TiO2 nanocomposites with enhanced photocatalytic activity under visible light illumination

2018 ◽  
Vol 44 (6) ◽  
pp. 7047-7056 ◽  
Author(s):  
M. Faisal ◽  
Farid A. Harraz ◽  
Adel A. Ismail ◽  
Ahmed Mohamed El-Toni ◽  
S.A. Al-Sayari ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Light Illumination ◽  
Visible Light Illumination

Cr Doped TiO2 Supported on TUD-1 Photocatalyst for Dye Photodegradation

2014 ◽  
Vol 69 (5) ◽  
Author(s):  
Ooi Yee Khai ◽  
Leny Yuliati ◽  
Siew Ling Lee
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Xrd Analysis ◽  
Bandgap Energy ◽  
Doped Tio2 ◽  
Visible Light Driven ◽  
Synthesized Materials

New visible light driven photocatalysts of 1 mol% Cr doped TiO2 supported on TUD-1 have been successfully synthesized. The Cr-TiO2/xTUD-1 (x = 10, 20, 30, 40 and 50) photocatalysts were prepared via surfactant-free sol-gel method followed by wet impregnation procedures. XRD analysis revealed that both TiO2 and Cr were incorporated in the highly porous siliceous matrix. FTIR analysis showed the existence of Si-O-Ti in all the materials. As observed, tetrahedral-coordinated Ti species were dominant in Cr-TiO2/10TUD-1, Cr-TiO2/20TUD-1 and Cr-TiO2/30TUD-1. Meanwhile, octahedral- coordinated Ti species were the dominant species in Cr-TiO2/40TUD-1 and Cr-TiO2/50TUD-1. It has been demonstrated that the amount of TUD-1 as photocatalyst support affected the wavelength response and the bandgap energy of the resulting materials. All the materials have bandgap energy of ~2.9 eV. The photocatalytic performance of the synthesized materials was tested out in dye photodegradation under visible light irradiation at 298 K for 5 hours. Results showed that all Cr-TiO2/TUD-1 materials had higher photocatalytic activity than that of Cr-TiO2. This could be explained by the high surface area and porosity provided by TUD-1 in enhancing the adsorption and diffusivities of the dye molecules, hence leading to the promising photocatalytic activity. Among the materials prepared, Cr-TiO2/30TUD-1 appeared as the most superior photocatalyst which gave the highest dye photodegradation.

SrTaO2N co-doped with La/Zr as promising photocatalysts for water reduction under visible light illumination

2020 ◽  
Vol 7 (12) ◽  
pp. 2343-2351
Author(s):  
Ran Wang ◽  
Guoan Lin ◽  
Xiaoxiang Xu
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Charge Separation ◽  
Light Illumination ◽  
Visible Light Absorption ◽  
Water Reduction ◽  
Co Doping ◽  
Visible Light Illumination ◽  
Co Doped ◽  
Separation Conditions

La/Zr co-doping preserves visible light absorption of SrTaO2N, prohibits the formation of defects, improves surface hydrophilicity and charge separation conditions, all of which contribute to an enhanced photocatalytic activity for water reduction.

VISIBLE LIGHT ACTIVE Cu2+/TiO2 NANOCATALYST FOR DEGRADATION OF DICHLORVOS

2012 ◽  
Vol 11 (05) ◽  
pp. 1250030 ◽  
Author(s):  
TESHOME ABDO SEGNE ◽  
SIVA RAO TIRUKKOVALLURI ◽  
SUBRAHMANYAM CHALLAPALLI
Keyword(s):  
Catalytic Activity ◽  
Visible Light ◽  
Photoelectron Spectroscopy ◽  
Diffuse Reflectance Spectroscopy ◽  
Sol Gel ◽  
Light Illumination ◽  
X Ray ◽  
Photo Catalytic Activity ◽  
Visible Light Active ◽  
Adsorption Desorption

The advantage of doping of TiO2 with copper has been utilized for enhanced degradation of pesticide under visible light irradiation. The sol–gel method has been undertaken for the synthesis of copper-doped TiO2 by varying the dopant loadings from 0.25 wt.% to 1.0 wt.% of Cu2+ . The doped samples were characterized by UV-Visible Diffuse Reflectance Spectroscopy (DRS), N2 adsorption–desorption (BET), X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscopy (SEM), and Energy Dispersive Spectrometry (EDS). The photocatalytic activity of the catalyst was tested by degradation of dichlorvos under visible light illumination. The results found that 0.75 wt.% of Cu2+ doped nanocatalysts have better photo catalytic activity than the rest of percentages doped, undoped TiO2 and Degussa P25. The reduction of band gap was estimated and the influence of the process parameters on photo catalytic activity of the catalyst has been explained.

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.

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