scholarly journals Preparation of High Activity Ga and Cu Doped ZnS by Hydrothermal Method for Hydrogen Production under Visible Light Irradiation

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Melody Kimi ◽  
Leny Yuliati ◽  
Mustaffa Shamsuddin
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Production ◽  
Visible Light ◽  
Production Rate ◽  
Hydrothermal Method ◽  
Visible Light Irradiation ◽  
Photocatalytic Property ◽  
Light Irradiation ◽  
Hydrogen Production Rate ◽  
Cu Doping

Ga(0.1),Cu(x)-ZnS (x=0.01, 0.03, 0.05) photocatalysts were successfully synthesized by hydrothermal method. The synthesized Ga and Cu codoped ZnS photocatalysts showed photocatalytic property effective for hydrogen production from aqueous solution containing Na2SO3and Na2S as sacrificial reagent under visible light irradiation. The rate of hydrogen production was found to be strongly dependent on Cu doping content. The highest photocatalytic activity is observed for Ga(0.1),Cu(0.01)-ZnS with hydrogen production rate of 114 µmol/h. The addition of Ga as codoped increased the photocatalytic activity to 58 times as compared to single doped Cu-ZnS. The Ga and Cu codoped ZnS photocatalysts are also stable under long irradiation. The enhancement in the photocatalytic activity of Ga and Cu codoped photocatalyst can be attributed to the synergistic effect between Ga and Cu. The photocatalytic activity was greatly enhanced with the addition of 0.5 wt% Ru as cocatalyst with a hydrogen production rate of 744 µmol/h.

Photocatalytic hydrogen production of the CdS/TiO2-WO3 ternary hybrid under visible light irradiation

2015 ◽  
Vol 73 (7) ◽  
pp. 1667-1672 ◽  
Author(s):  
Yi-Lin Chen ◽  
Shang-Lien Lo ◽  
Hsiang-Ling Chang ◽  
Hsiao-Mei Yeh ◽  
Liping Sun ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Production Rate ◽  
Water Splitting ◽  
Visible Light Irradiation ◽  
Platinum Metal ◽  
Light Irradiation ◽  
Hydrogen Energy ◽  
Hydrogen Production Rate ◽  
Photocatalytic Hydrogen Production

An attractive and effective method for converting solar energy into clean and renewable hydrogen energy is photocatalytic water splitting over semiconductors. The study aimed at utilizing organic sacrificial agents in water, modeled by formic acid, in combination with visible light driven photocatalysts to produce hydrogen with high efficiencies. The photocatalytic hydrogen production of cadmium sulfide (CdS)/titanate nanotubes (TNTs) binary hybrid with specific CdS content was investigated. After visible light irradiation for 3 h, the hydrogen production rate of 25 wt% CdS/TNT achieved 179.35 μmol·h−1. Thanks to the two-step process, CdS/TNTs-WO3 ternary hybrid can better promote the efficiency of water splitting compared with CdS/TNTs binary hybrid. The hydrogen production of 25 wt% CdS/TNTs-WO3 achieved 212.68 μmol·h−1, under the same condition. Coating of platinum metal onto the WO3 could further promote the reaction. Results showed that 0.2 g 0.1 wt% Pt/WO3 + 0.2 g 25 wt% CdS/TNTs had the best hydrogen production rate of 428.43 μmol·h−1. The resultant materials were well characterized by high-resolution transmission electron microscope, X-ray diffraction, scanning electron microscopy, and UV-Vis spectra.

scholarly journals High activity of Ag-doped Cd0.1Zn0.9S photocatalyst prepared by the hydrothermal method for hydrogen production under visible-light irradiation

2014 ◽  
Vol 5 ◽  
pp. 587-595 ◽  
Author(s):  
Leny Yuliati ◽  
Melody Kimi ◽  
Mustaffa Shamsuddin
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Production ◽  
Visible Light ◽  
Hydrothermal Method ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Precipitation Method ◽  
Ag Doping ◽  
Light Region ◽  
Co Precipitation

Background: The hydrothermal method was used as a new approach to prepare a series of Ag-doped Cd0.1Zn0.9S photocatalysts. The effect of Ag doping on the properties and photocatalytic activity of Cd0.1Zn0.9S was studied for the hydrogen production from water reduction under visible light irradiation. Results: Compared to the series prepared by the co-precipitation method, samples prepared by the hydrothermal method performed with a better photocatalytic activity. The sample with the optimum amount of Ag doping showed the highest hydrogen production rate of 3.91 mmol/h, which was 1.7 times higher than that of undoped Cd0.1Zn0.9S. With the Ag doping, a red shift in the optical response was observed, leading to a larger portion of the visible light absorption than that of without doping. In addition to the larger absorption in the visible-light region, the increase in photocatalytic activity of samples with Ag doping may also come from the Ag species facilitating electron–hole separation. Conclusion: This study demonstrated that Ag doping is a promising way to enhance the activity of Cd0.1Zn0.9S photocatalyst.

Improving the photocatalytic hydrogen production of Ag/g-C3N4 nanocomposites by dye-sensitization under visible light irradiation

Nanoscale ◽  
2016 ◽  
Vol 8 (4) ◽  
pp. 2249-2259 ◽  
Author(s):  
Jiayi Qin ◽  
Jingpei Huo ◽  
Piyong Zhang ◽  
Jian Zeng ◽  
Tingting Wang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Production ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Dye Sensitization ◽  
Photocatalytic Hydrogen Production

Fluorescein-sensitized Ag/g-C3N4 nanocomposites have a remarkably enhanced photocatalytic activity for hydrogen production under visible light.

Photocatalytic Properties of α-Bi2O3 Nanoneedle Array Synthesized by Hydrothermal Method

2011 ◽  
Vol 181-182 ◽  
pp. 332-335 ◽  
Author(s):  
H.Y. Wang ◽  
Y.C. Yang ◽  
L. Le ◽  
Y. Liu ◽  
J.H. Wei ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Band Gap ◽  
Hydrothermal Method ◽  
Visible Light Irradiation ◽  
Narrow Band ◽  
Light Irradiation ◽  
Nanoneedle Array ◽  
Special Morphology ◽  
Array Structures

Pureα-Bi2O3with nanoneedle array structure was synthesized directly by hydrothermal method. The optic absorption of theα-Bi2O3paricles was cut off at ~483 nm and the band gap of theα-Bi2O3was estimated to be 2.57 eV. The photocatalytic activity of theα-Bi2O3samples was higher than TiO2under a visible light irradiation. As a conclusion, relative narrow band gap ofα-Bi2O3nanoneedle array compared to anatase and the special morphology of nanoneedle array structures may improve the photocatalytic activity in visible light irradiation.

Enhanced Photocatalytic Performance of Iodine Doped Bi2WO6 Nanostructures under Visible-Light Irradiation

2013 ◽  
Vol 423-426 ◽  
pp. 163-166 ◽  
Author(s):  
Bao Wei Cao ◽  
Yun Hua Xu
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Hydrothermal Method ◽  
Absorption Spectra ◽  
Visible Light Irradiation ◽  
Rhodamine B ◽  
Photocatalytic Performance ◽  
Red Shift ◽  
Light Irradiation ◽  
Photocatalytic Activities

Bi2WO6 doped with iodine ions were synthesized using hydrothermal method and their photocatalytic activities to degrade Rhodamine B (RhB) under visible-light was investigated. The successful incorporation of I ions in Bi2WO6 was proved by XRD and XPS. UV-vis absorption spectra results show that I ion was successfully doped into Bi2WO6 and a red shift for I-doped Bi2WO6 appeared when compared to pure Bi2WO6. The photocatalytic activities of the photocatalysts were evaluated by the decolorization of RhB under visible-light irradiation. The results showed that the photocatalytic activity of I-doped Bi2WO6 was much higher than the undoped Bi2WO6.

Enhanced hydrogen production by carbon-doped TiO2 decorated with reduced graphene oxide (rGO) under visible light irradiation

RSC Advances ◽  
2016 ◽  
Vol 6 (3) ◽  
pp. 2479-2488 ◽  
Author(s):  
Liyuan Kuang ◽  
Wen Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Hydrogen Production ◽  
Visible Light ◽  
Reduced Graphene Oxide ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Hybrid Nanocomposite ◽  
Carbon Doped ◽  
Reduced Graphene

Carbon doped TiO2 anchored to reduced graphene oxide formed a hybrid nanocomposite (C-TiO2/rGO) that exhibited greater photocatalytic activity and stability.

Three-dimensional MoS2–CdS–γ-TaON hollow composites for enhanced visible-light-driven hydrogen evolution

2014 ◽  
Vol 50 (14) ◽  
pp. 1731-1734 ◽  
Author(s):  
Zheng Wang ◽  
Jungang Hou ◽  
Chao Yang ◽  
Shuqiang Jiao ◽  
Hongmin Zhu
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Production Rate ◽  
Hydrothermal Method ◽  
Hydrogen Evolution ◽  
Three Dimensional ◽  
Hydrogen Production Rate ◽  
Facile Hydrothermal Method ◽  
Hollow Nanostructures ◽  
Visible Light Driven

Three-dimensional MoS2–CdS–γ-TaON hollow nanostructures as novel photocatalysts were firstly synthesized via a facile hydrothermal method and they exhibit a high photocatalytic hydrogen production rate without a noble metal.

Preparation, Characterization and Photocatalytic Properties of Ag-Loaded Bi2WO6

2013 ◽  
Vol 750-752 ◽  
pp. 1091-1097
Author(s):  
Xiao Ming Gao ◽  
Feng Fu ◽  
Feng Xing Niu ◽  
Li Ping Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Hydrothermal Method ◽  
Noble Metal ◽  
Visible Light Irradiation ◽  
Orthorhombic Phase ◽  
Blue Shift ◽  
Light Irradiation ◽  
Photocatalytic Properties ◽  
Significant Enhancement

Ag-loaded Bi2WO6nanoparticles were prepared by hydrothermal method. The products were characterized by XRD, UV-vis DRS, SEM and BET. The results indicated that it was the orthorhombic phase of Bi2WO6and showed a markedly blue-shift Compared with pure Bi2WO6. Ag/Bi2WO6photocatalysts exhibited obviously enhanced photocatalysis than pure Bi2WO6in degrading phenol-containingwastewater under visible light irradiation. The influence of the content of silver on the photocatalyticactivity of Bi2WO6has been investigated. The resultsrevealed that the significant enhancement of photocatalytic activity can beattributed to the synergetic effects between noble metal and semiconductor component.

The enhanced photocatalytic activity of g-C3N4-LaFeO3 for the water reduction reaction through a mediator free Z-scheme mechanism

2017 ◽  
Vol 4 (6) ◽  
pp. 1022-1032 ◽  
Author(s):  
S. Acharya ◽  
S. Mansingh ◽  
K. M. Parida
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Production ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Reduction Reaction ◽  
Light Irradiation ◽  
Water Reduction ◽  
Solid Interface

A g-C3N4/LaFeO3 solid–solid interface showing enhanced hydrogen production ability under visible-light irradiation through a mediator free Z-Scheme mechanism.

Sign in / Sign up

Export Citation Format

Share Document