scholarly journals Modified Nano-TiO2 Based Composites for Environmental Photocatalytic Applications

Catalysts ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 759 ◽  
Author(s):  
Shuo Wang ◽  
Zhu Ding ◽  
Xue Chang ◽  
Jun Xu ◽  
Dan-Hong Wang
Keyword(s):  
Active Sites ◽  
Dye Degradation ◽  
Hollow Nanospheres ◽  
Nano Tio2 ◽  
Ultrathin Nanosheets ◽  
Light Region ◽  
Surface Active ◽  
Visible Irradiation ◽  
Nonmetal Doping ◽  
Photocatalytic Applications

TiO2 probably plays the most important role in photocatalysis due to its excellent chemical and physical properties. However, the band gap of TiO2 corresponds to the Ultraviolet (UV) region, which is inactive under visible irradiation. At present, TiO2 has become activated in the visible light region by metal and nonmetal doping and the fabrication of composites. Recently, nano-TiO2 has attracted much attention due to its characteristics of larger specific surface area and more exposed surface active sites. nano-TiO2 has been obtained in many morphologies such as ultrathin nanosheets, nanotubes, and hollow nanospheres. This work focuses on the application of nano-TiO2 in efficient environmental photocatalysis such as hydrogen production, dye degradation, CO2 degradation, and nitrogen fixation, and discusses the methods to improve the activity of nano-TiO2 in the future.

Role of the Structure and Electronic Properties of Fe2O3-MoO3 Catalyst on the Dehydration of Isopropyl Alcohol

1993 ◽  
Vol 58 (7) ◽  
pp. 1591-1599 ◽  
Author(s):  
Abd El-Aziz A. Said
Keyword(s):  
Active Sites ◽  
Isopropyl Alcohol ◽  
Oxide Catalyst ◽  
Flow System ◽  
Charge Carriers ◽  
X Ray Diffraction ◽  
X Ray ◽  
Catalyst Composition ◽  
Surface Active

Molybdenum oxide catalyst doped or mixed with (1 - 50) mole % Fe3+ ions were prepared. The structure of the original samples and the samples calcined at 400 °C were characterized using DTA, X-ray diffraction and IR spectra. Measurements of the electrical conductivity of calcined samples with and without isopropyl alcohol revealed that the conductance increases on increasing the content of Fe3+ ions up to 50 mole %. The activation energies of charge carriers were determined in presence and absence of the alcohol. The catalytic dehydration of isopropyl alcohol was carried out at 250 °C using a flow system. The results obtained showed that the doped or mixed catalysts are active and selective towards propene formation. However, the catalyst containing 40 mole % Fe3+ ions exhibited the highest activity and selectivity. Correlations were attempted to the catalyst composition with their electronic and catalytic properties. Probable mechanism for the dehydration process is proposed in terms of surface active sites.

Cathodic Corrosion Activated Fe-based Nanoglass as Highly-Active and -Stable Oxygen Evolution Catalyst for Water Splitting

2021 ◽  
Author(s):  
Kaiyao Wu ◽  
Fei Chu ◽  
Yuying Meng ◽  
Kaveh Edalati ◽  
Qingsheng Gao ◽  
...  
Keyword(s):  
Water Splitting ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Amorphous Alloys ◽  
Precious Metal ◽  
Active Sites ◽  
Metal Free ◽  
Highly Active ◽  
Stable Oxygen ◽  
Surface Active

Transition metal-based amorphous alloys have attracted increasing attention as precious-metal-free electrocatalysts for oxygen evolution reaction (OER) of water splitting due to their high macro-conductivity and abundant surface active sites. However,...

scholarly journals Prepare a catalyst consist of rare earth minerals to denitrate via NH3-SCR

2020 ◽  
Vol 9 (1) ◽  
pp. 191-202
Author(s):  
Jian Wang ◽  
Chao Zhu ◽  
Baowei Li ◽  
Zhijun Gong ◽  
Zhaolei Meng ◽  
...  
Keyword(s):  
Rare Earth ◽  
Active Sites ◽  
Nh3 Scr ◽  
Composite Oxides ◽  
Rare Earth Minerals ◽  
Denitrification Activity ◽  
Denitrification Reactor ◽  
Surface Active ◽  
Rare Earth Tailings ◽  
Treatment Step

AbstractTo research the roles of rare earth minerals in denitrification via the NH3-SCR, a mixture was made by certain ratio of rare earth concentrates and rare earth tailings, then treated by microwave roasting, and acids and bases to form a denitrification catalyst. The mineral phase structure and surface morphology of the catalyst were characterized by XRD, BET, SEM and EDS. The surface properties of the catalyst were tested by TPD and XPS methods, and the denitrification activity of the catalyst was evaluated in a denitrification reactor. The results showed that the denitrification efficiency increased up to 82% with complete processing. XRD, BET, SEM, and EDS spectrum analysis stated that the treated minerals contained cerium oxides and Fe−Ce composite oxides. The surface of the modified minerals became rough and porous, the surface area increased, and the surface-active sites were exposed. The results of NH3-TPD and NO-TPD showed that the catalyst surface could gradually adsorb more NH3 and NO after each step. XPS analysis indicated that there were more Ce3+, Fe2+, and lattice oxygen in rare earth minerals catalyst after each treatment step.

Enhanced photocatalytic H2 evolution over micro-SiC by coupling with CdS under visible light irradiation

2014 ◽  
Vol 2 (18) ◽  
pp. 6296-6300 ◽  
Author(s):  
Yuan Peng ◽  
Zhongnan Guo ◽  
Jingjing Yang ◽  
Da Wang ◽  
Wenxia Yuan
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Active Sites ◽  
Fine Tuning ◽  
Surface Activation ◽  
H2 Evolution ◽  
Effective Surface ◽  
Suitable Amount ◽  
Surface Active ◽  
Photocatalytic H2 Evolution

Fine-tuning surface activation of the micro-SiC catalyst via hybridizing a suitable amount of CdS to obtain effective surface active sites.

3D self-assembled VS4 microspheres with high pseudocapacitance as highly efficient anodes for Na-ion batteries

Nanoscale ◽  
2018 ◽  
Vol 10 (46) ◽  
pp. 21671-21680 ◽  
Author(s):  
Wenbin Li ◽  
Jianfeng Huang ◽  
Liangliang Feng ◽  
Liyun Cao ◽  
Shuwei He
Keyword(s):  
Active Sites ◽  
High Capacity ◽  
Rate Capability ◽  
High Rate ◽  
High Rate Capability ◽  
Highly Efficient ◽  
Pseudocapacitive Behavior ◽  
Surface Active ◽  
Self Assembled ◽  
Cycling Life

The decreasing crystallinity of VS4 microspheres greatly increases the surface active sites, and then promotes the pseudocapacitive behavior, and finally leads to the high capacity, long cycling life and high rate capability.

In situ template synthesis of hollow nanospheres assembled from NiCo2S4@C ultrathin nanosheets with high electrochemical activities for lithium storage and ORR catalysis

2017 ◽  
Vol 19 (18) ◽  
pp. 11554-11562 ◽  
Author(s):  
Xiaoyu Wu ◽  
Songmei Li ◽  
Bo Wang ◽  
Jianhua Liu ◽  
Mei Yu
Keyword(s):  
Template Synthesis ◽  
Hollow Nanospheres ◽  
Lithium Storage ◽  
Template Removal ◽  
Ultrathin Nanosheets ◽  
Ultrathin Nanosheet

NiCo2S4@C ultrathin nanosheet assembled hollow nanospheres are fabricated by synchronized sulfurization and in situ template removal, and exhibit high electrochemical activities for lithium storage and ORR catalysis.

Nanoboxes endow non-noble-metal-based electrocatalysts with high efficiency for overall water splitting

2021 ◽  
Author(s):  
Cheng Wang ◽  
Hongyuan Shang ◽  
Hui Xu ◽  
Yukou Du
Keyword(s):  
Water Splitting ◽  
Noble Metal ◽  
Active Sites ◽  
High Efficiency ◽  
Synergistic Effects ◽  
Electron Mass ◽  
Electronic Effects ◽  
Promising Candidate ◽  
Surface Active ◽  
Electrochemical Water Splitting

Non-noble-metal nanoboxes with abundant surface active sites, facilitated electron/mass transport, favorable synergistic effects and electronic effects, serving as promising candidate materials for boosting electrochemical water splitting.

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