scholarly journals In situ preparation of oxygen-deficient TiO2 microspheres with modified {001} facets for enhanced photocatalytic activity

RSC Advances ◽  
2017 ◽  
Vol 7 (16) ◽  
pp. 9902-9907 ◽  
Author(s):  
Xiaogang Liu ◽  
Yingpu Bi
Keyword(s):  
Photocatalytic Activity ◽  
Reaction Time ◽  
Hydrothermal Reaction ◽  
Active Oxygen ◽  
In Situ Preparation ◽  
Synthetic Strategy ◽  
Highly Active ◽  
Tio2 Microspheres ◽  
Hydrothermal Reaction Time

A facile in situ synthetic strategy has been developed to prepare highly active oxygen-deficient anatase TiO2 microspheres single crystal with modified {001} faceted by simply controlling the hydrothermal reaction time.

Preparation of Ba3In2(OH)12 and its Photocatalytic Performance

2016 ◽  
Vol 852 ◽  
pp. 618-625
Author(s):  
Qin Ku Zhang ◽  
Bing Hua Yao
Keyword(s):  
Photocatalytic Activity ◽  
Reaction Time ◽  
Hydrothermal Method ◽  
Reaction Temperature ◽  
Hydrothermal Reaction ◽  
Solar Irradiation ◽  
Evolution Rate ◽  
Molar Ratio ◽  
Ternary Oxide ◽  
Hydrothermal Reaction Time

Hydrogarnet Ba3In2(OH)12 was synthesized by hydrothermal method from raw materials Ba(NO3)2 and In(OH)3. The obtained sample was characterized by X-ray diffraction (XRD), scanning electron microscope(SEM), UV-visible diffuse reflectance spectroscopy (UV-vis DRS) and N2 adsorption-desorption isotherms (BET). Photocatalyitc activity was tested via rhodamine B(RhB) degradation as the modle pollutant. The influence of hydrothermal reaction temperature (T), hydrothermal reaction time (t), Ba/In molar ratio(Ba/In), and NaOH concentration(Cg) on the photocatalytic activity of Ba3In2(OH)12 were investigated. The results showed that the synthetic Ba3In2(OH)12 exhibited highest photocatalytic activity under the optimum hydrothermal reaction conditions of T=200°C, t=14 h, Ba/In=2:1 and Cg=7 mol/L. RhB can be completely mineralized by Ba3In2(OH)12 under 125 W mercury light irradiation for 3 hours. There are many scholars and experts engaged in the research of various types of photocatalytic materials and applied in the degradation of environmental pollutants in the last 40 years. Such as, the oxide of In2O3[1], ZnO, TiO2 et al. The ternary oxide of indium, molybdate, tungstate and vanadate et al. New type quaternary metal oxide. In the past 20 years, indium-based semiconductor material were got rapid development in the field of display, laser, microwave devices, light-emitting diodes and photocatalyst because of which had good gas sensitivity, heat sensitivity, photosensitivity and other characteristics. CaIn2O4 was synthesized using self-propagating high-temperature sysnthesis method[2]. RhB can be absolutely mineralized under solar irradiation for 2 hours. The g-C3N4/CaIn2O4 composite was synthesized using facile solvothermal method[3]. The g-C3N4/CaIn2O4 composite reached a high H2 evolution rate of 62.5 μmol/h from CH3OH/ H2O solution when the content of grapheme was 1wt%. Furthermore, the 1wt% g-C3N4/CaIn2O4 composite did not show deactivation for H2 evolution for longer than 32 h. The core-shell like composite In2O3@Ba2In2O5 was synthesized via chemical impregnation method with sample calcination[4]. It degraded 100% of the MB in 30 min compared with P-25, which degraded 100% of the MB in 120 min. C-CdIn2O4 nanoparticle was synthesized by sol-gel templating method[5]. Natural sunlight illumination experiments showed the H2 evolution rate of C-CdIn2O4 was 17 μmol/h as compared to 2.1 μmol/h for the Pt:TiO2. Hydrogarnet Ba3In2(OH)12 was first described by Kwestroo et al in 1977, who used the prolonged refluxing of BaCl2 and In2O3 in 12 mol/L NaOH at 110°C[6]. The pure Ba3In2(OH)12 was prepared by first preparing pure Ba3In2O6 by prolonged reaction of stoichiometric amounts of BaCO3 and In2O3 at 1300 °C. Then, the pure Ba3In2O6 was reacted with 12 mol/L NaOH at 85 °C for 12 hours under a pure nitrogen atmosphere[7]. Hydrogarnet Ba3In2(OH)12 was synthesized by hydrothermal method, using In(OH)3, Ba(NO3)2 and NaOH. With RhB as a model degradation pollutant, the influence of hydrothermal reaction temperature, hydrothermal reaction time, Ba/In molar ratio and NaOH concentration on the photocatalytic activity of Ba3In2(OH)12 were investigated and the photocatalytic degradation mechanism of RhB were investigated. The results can provide references for the research and application of this material system in the future.

scholarly journals EFFECT OF PRECURSOR MATERIALS AND HYDROTHERMAL TIME ON THE MORPHOLOGY, MICROSTRUCTURE AND PHOTOCATALYTIC ACTIVITY OF TiO2 NANOTUBES

2018 ◽  
Vol 54 (4B) ◽  
pp. 72
Author(s):  
Thi Ngo Tu Le
Keyword(s):  
Photocatalytic Activity ◽  
Reaction Time ◽  
Tio2 Nanotubes ◽  
Hydrothermal Reaction ◽  
Photocatalytic Property ◽  
Uniform Structure ◽  
Hydrothermal Time ◽  
Hydrothermal Reaction Time ◽  
Selection Of

In this study, effects of precursor materials and hydrothermal reaction time on the morphology, microstructures and photocatalytic activity of TiO2 nanotubes (TNTs) were investigated. Results show that the selection of nanopowder TiO2 precursors and hydrothermal time has significantly affected the morphology, microstructure and photocatalytic property of TiO2 nanotubes. TNTs–Merck was fabricated from TiO2–Merck precursor at 130 °C for 22 h possesses a uniform structure with a range of the diameter of ~ 10 nm and length of ~ 100 nm. 

scholarly journals French Fries-Like Bismuth Oxide: Physicochemical Properties, Electrical Conductivity and Photocatalytic Activity

2021 ◽  
Vol 17 (1) ◽  
pp. 146-156
Author(s):  
Yayuk Astuti ◽  
Fauzan Musthafa ◽  
Arnelli Arnelli ◽  
Iis Nurhasanah
Keyword(s):  
Crystal Structure ◽  
Photocatalytic Activity ◽  
Reaction Time ◽  
Bismuth Oxide ◽  
Hydrothermal Reaction ◽  
Oh Groups ◽  
Time Variations ◽  
Methyl Orange Dye ◽  
Hydrothermal Reaction Time ◽  
Open Access Article

Bismuth oxide synthesis using hydrothermal method has been conducted. This study aims to examine the effect of the hydrothermal reaction time on product characteristics and photocatalytic activity in degrading methyl orange dye. Bismuth oxide synthesis was initiated by dissolving bismuth nitrate pentahydrate (Bi(NO3)3.5H2O) and Na2SO4 in a distilled water and added NaOH gradually. The solution formed was transferred into a Teflon-lined autoclave and heated at 120 °C with time variations of 8–16 h. The formation of bismuth oxide was indicated by the vibrations of the Bi−O−Bi and Bi−O groups and the crystal structure consisting of a-Bi2O3, β-Bi2O3, and g-Bi2O3. In addition, the highest photocatalytic activity can be examined through several factors, such as: content of Bi−O−Bi and Bi−OH groups, crystal structure, band gap values, morphology, and surface area, acquired as a result of the effect of hydrothermal reaction time. 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). 

Influence of hydrothermal reaction time on the supercapacitor performance of Ni-MOF nanostructures

2021 ◽  
Vol 127 (6) ◽  
Author(s):  
M. R. Manikandan ◽  
K. P. Cai ◽  
Y. D. Hu ◽  
C. L. Li ◽  
J. T. Zhang ◽  
...  
Keyword(s):  
Reaction Time ◽  
Hydrothermal Reaction ◽  
Supercapacitor Performance ◽  
Hydrothermal Reaction Time

Effect of hydrothermal dwell time on the diameter-controlled synthesis and magnetic property of MnO2 nanorods

2014 ◽  
Vol 28 (06) ◽  
pp. 1450045 ◽  
Author(s):  
Arbab Mohammad Toufiq ◽  
Fengping Wang ◽  
Qurat-ul-Ain Javed ◽  
Yan Li
Keyword(s):  
Electron Microscopy ◽  
Reaction Time ◽  
Dwell Time ◽  
Hydrothermal Reaction ◽  
Ferromagnetic Behavior ◽  
X Ray Diffraction ◽  
Hydrothermal Route ◽  
Transmission Electron ◽  
Facile Hydrothermal Route ◽  
Hydrothermal Reaction Time

In this paper, single crystalline 1D tetragonal MnO 2 pen-type nanorods were synthesized by varying the dwell time through a facile hydrothermal route at a reaction temperature of 250°C. X-ray diffraction (XRD) and transmission electron microscopy (TEM) studies showed that the diameter of MnO 2 nanorods decreases from 460 nm to 250 nm with the increase in hydrothermal reaction time from 5 h to 15 h. Field-emission scanning electron microscopy (FESEM) and TEM studies revealed the evolution of improved surface morphology of MnO 2 nanorods that are prepared with longer hydrothermal reaction time. The magnetic properties of the products were evaluated using vibrating sample magnetometer (VSM) at room temperature, which showed that the as-prepared samples exhibit weak ferromagnetic behavior. The effect of diameter on the magnetization values was observed and discussed in detail.

In-situ preparation of Z-scheme AgI/Bi5O7I hybrid and its excellent photocatalytic activity

2016 ◽  
Vol 387 ◽  
pp. 912-920 ◽  
Author(s):  
Min Cui ◽  
Jingxiong Yu ◽  
Hongjun Lin ◽  
Ying Wu ◽  
Leihong Zhao ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
In Situ Preparation ◽  
Excellent Photocatalytic Activity
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