Photocatalytic Water Splitting and Photocatalytic Degradation in Aqueous GdVO4 Suspensions under Simulated Solar Irradiation

2013 ◽  
Vol 873 ◽  
pp. 571-574 ◽  
Author(s):  
Yan Bai ◽  
Ya Ming Ding ◽  
Zhi Min Li
Keyword(s):  
Photocatalytic Activity ◽  
High Temperature ◽  
Solid State ◽  
Water Splitting ◽  
Rhodamine B ◽  
Pure Water ◽  
Xrd Analysis ◽  
Solar Irradiation ◽  
Tetragonal Type ◽  
Simulated Solar Irradiation

GdVO4 was synthesized by solid state reaction at high temperature and characterized by XRD, UVvisible DRS, BET and SEM. XRD analysis of GdVO4 showed its structure was of tetragonal type. When GdVO4 was loaded with 0.3 wt% Pt, it showed the better photocatalytic activity for water splitting under simulated solar irradiation, and the amounts of the produced hydrogen in pure water were about 9.33 μmol under the irradiation of simulated solar for 6 h. Furthermore, photodegradation of Rhodamine B (Rh B ) on the samples were investigated under simulated solar irradiation.

Crystal structure and magnetic and photocatalytic properties of a new ternary rare-earth mixed chalcogenide, Dy4S4Te3

2014 ◽  
Vol 2 (48) ◽  
pp. 20621-20628 ◽  
Author(s):  
Sheng-Ping Guo ◽  
Guo-Cong Guo
Keyword(s):  
Crystal Structure ◽  
Photocatalytic Activity ◽  
Rare Earth ◽  
High Temperature ◽  
Solid State ◽  
Rhodamine B ◽  
Solid State Reaction ◽  
Energy Gap ◽  
Halogen Lamp ◽  
Polycrystalline Powder

New mixed-chalcogenide Dy4S4Te3 was synthesized by a facile high-temperature solid-state reaction based on energy gap engineering, polycrystalline powder shows photocatalytic activity for the decomposition of rhodamine B under halogen lamp irradiation.

Rapid Degradation of Rhodamine B over Cyclodextrin Modified TiO2

2011 ◽  
Vol 694 ◽  
pp. 764-768
Author(s):  
Xu Zhang ◽  
Nan Sheng Deng
Keyword(s):  
Electron Transfer ◽  
Excited States ◽  
Rhodamine B ◽  
Self Assembly ◽  
Initial Rate ◽  
Solar Irradiation ◽  
Pollutant Degradation ◽  
Rapid Degradation ◽  
Hybrid Nanomaterial ◽  
Simulated Solar Irradiation

A novel β-cyclodextrin (β-CD) grafted titanium dioxide (TiO2/β-CD) was synthesized through photo-induced self assembly methods, and its structure was characterized. The TiO2/β-CD hybrid nanomaterial showed high photoactivity under visible light irradiation (λ  400 nm and/or λ  420 nm) and simulated solar irradiation (λ  365 nm). Photodegradation of rhodamine B followed the Langmuir–Hinshelwood kinetics model. The initial rate R0 of rhodamine B degradation increased by 4.6, 2.4 and 1.5 times in the irradiation conditions of λ  420 nm, λ  400 nm and λ  365 nm, respectively. β-CD increased the lifetimes of the excited states of the unreactive guests and facilitated the electron transfer from the excited dye to the TiO2 conduction band, which enhanced the dye pollutant degradation.

scholarly journals A heterojunction photocatalyst composed of zinc rhodium oxide, single crystal-derived bismuth vanadium oxide, and silver for overall pure-water splitting under visible light up to 740 nm

2016 ◽  
Vol 18 (40) ◽  
pp. 27754-27760 ◽  
Author(s):  
Ryoya Kobayashi ◽  
Toshihiro Takashima ◽  
Satoshi Tanigawa ◽  
Shugo Takeuchi ◽  
Bunsho Ohtani ◽  
...  
Keyword(s):  
Solid State ◽  
Visible Light ◽  
Vanadium Oxide ◽  
Single Crystal ◽  
Water Splitting ◽  
Pure Water ◽  
Red Light ◽  
Rhodium Oxide

We have prepared a solid-state heterojunction photocatalyst, which can split pure water under red light up to 740 nm.

scholarly journals Properties and Photocatalytic Activity ofβ-Ga2O3Nanorods under Simulated Solar Irradiation

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Yinzhen Wang ◽  
Ning Li ◽  
Pingping Duan ◽  
Xuwei Sun ◽  
Benli Chu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Photoelectron Spectroscopy ◽  
Light Emission ◽  
Methyl Orange Solution ◽  
High Photocatalytic Activity ◽  
Solar Irradiation ◽  
X Ray ◽  
Transmission Electron ◽  
Blue Solution ◽  
Simulated Solar Irradiation

β-Ga2O3nanorods are prepared by hydrothermal method and characterized by X-ray diffraction, high-resolution transmission electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, and photoluminescence spectra. The results reveal that high crystallinity, monoclinic phase ofβ-Ga2O3nanorods were prepared with a diameter of about 60 nm and length of 500 nm. Photoluminescence study indicates that theβ-Ga2O3nanorods exhibit a broad blue light emission at room temperature. Theβ-Ga2O3nanorods displayed high photocatalytic activity under simulated solar irradiation; after 2 h irradiation, over 95% of methylene blue solution and over 90% of methyl orange solution were decolorized. Since this process does not require additional hydrogen peroxide and uses solar light, it can be developed as an economically feasible and environmentally friendly method to treat dye effluent.

Preparation and photocatalytic activity of pendant heteroaryl groups (pyrimidine and pyridine) grafted polyterthiophene/TiO2 composites

2020 ◽  
Vol 10 (11) ◽  
pp. 1877-1891
Author(s):  
Yingcheng Liu ◽  
Abdukeyum Abdurexit ◽  
Ruxangul Jamal ◽  
Wenli Zhang ◽  
Yinqiang Yan ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Structural Analysis ◽  
Uv Light ◽  
Spectral Response ◽  
Solar Irradiation ◽  
Molar Ratio ◽  
Response Range ◽  
Non Covalent Interactions ◽  
Simulated Solar Irradiation ◽  
Covalent Interactions

In this paper, new π-conjugated heterocyclic systems with pyrimidine- and pyridine-grafted polyterthiophene were combined with TiO2 to obtain composite materials (PDTPrT/TiO2 and PDTPrmT/TiO2). The photocatalytic properties of the composites were tested by using them to degrade MB using UV-light and simulated solar irradiation. The structural analysis revealed that the pyrimidine and pyridine groups in the polyterthiophenes interacted with TiO2 via non-covalent interactions. The combination of the substituted polyterthiophene and TiO2 restrained the recombination rate of photogenerated e-?h+ pairs and broadened the spectral response range of TiO2. The results indicated that PDTPrT/TiO2 and PDTPrmT/TiO2 with a TiO2-to-monomer molar ratio of 75 had the highest photodegradation rates under UV light (98.6% and 97.4%, respectively after 10 min) and simulated solar (95.4% and 92.7%, respectively after 300 min).

scholarly journals Solar Photocatalytic Degradation of Bisphenol A on Immobilized ZnO or TiO2

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Andreas Zacharakis ◽  
Efthalia Chatzisymeon ◽  
Vassilios Binas ◽  
Zacharias Frontistis ◽  
Danae Venieri ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Endocrine Disruptors ◽  
Treatment Time ◽  
Pure Water ◽  
Operating Conditions ◽  
Solar Irradiation ◽  
Water Matrix ◽  
Immobilized Catalyst ◽  
Low Concentrations ◽  
Simulated Solar Irradiation

The removal of bisphenol A (BPA) under simulated solar irradiation and in the presence of either TiO2or ZnO catalysts immobilized onto glass plates was investigated. The effect of various operating conditions on degradation was assessed including the amount of the immobilized catalyst (36.1–150.7 mg/cm2for TiO2and 0.5–6.8 mg/cm2for ZnO), initial BPA concentration (50–200 μg/L), treatment time (up to 90 min), water matrix (wastewater, drinking water, and pure water), the addition of H2O2(25–100 mg/L), and the presence of other endocrine disruptors in the reaction mixture. Specifically, it was observed that increasing the amount of immobilized catalyst increases BPA conversion and so does the addition of H2O2up to 100 mg/L. Moreover, BPA degradation follows first-order reaction kinetics indicating that the final removal is not practically affected by the initial BPA concentration. Degradation in wastewater is slower than that in pure water up to five times, implying the scavenging behavior of effluent’s constituents against hydroxyl radicals. Finally, the presence of other endocrine disruptors, such as 17α-ethynylestradiol, spiked in the reaction mixture at low concentrations usually found in environmental samples (i.e., 100 μg/L), neither affects BPA degradation nor alters its kinetics to a considerable extent.

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