High specific surface area defective g-C3N4 nanosheets with enhanced photocatalytic activity prepared by using glyoxylic acid mediated melamine

2020 ◽  
Vol 256 ◽  
pp. 123755
Author(s):  
He Cai ◽  
Dongyuan Han ◽  
Xiaona Wang ◽  
Xiangxiang Cheng ◽  
Jing Liu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Glyoxylic Acid ◽  
High Specific Surface Area

scholarly journals Evaluation of the photocatalytic activity of concrete

2021 ◽  
Vol 6 (4) ◽  
pp. 13-20
Author(s):  
E. Krushel'nickaya
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Ultraviolet Radiation ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Concrete Surface ◽  
High Specific Surface Area ◽  
Foreign Manufacturer ◽  
Over Time

Based on the change in the color of an organic dye – rhodamine B, on the surface of concrete under the action of ultraviolet radiation, a theoretical and experimental assessment of the photocatalytic activity of concrete was carried out. Photocatalytic activity was calculated using the obtained coordinates of colorimetry L * a * b *. To assess the performance of the photocatalyst over time, a test was carried out with concrete samples at the age of 7 and 28 days. Titanium dioxide of three types of anatase modification of a foreign manufacturer was used as a photocatalyst in the study. It is shown that the introduction of titanium dioxide into concrete promotes self-cleaning of its surface. The values of discoloration of the dye on the concrete surface were obtained depending on its composition and on the time of exposure to ultraviolet radiation. It was determined that the value of the specific surface area of titanium dioxide affects the photocatalytic activity. It is noted that with the age of concrete samples, there is a noticeable decrease in phototransformation. It was also found that the high specific surface area of titanium dioxide allows it to exhibit its photocatalytic properties over time.

Nitrogen Doping to Metatitanic Acid by NH3 Heat Treatment for Achieving Visible-Light-Responsive Photocatalytic Activity

2013 ◽  
Vol 761 ◽  
pp. 35-39
Author(s):  
Se Keun Park ◽  
Jun Ho Eun ◽  
Hyun Ho Shin
Keyword(s):  
Heat Treatment ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Nitrogen Doping ◽  
High Specific Surface Area ◽  
Metatitanic Acid ◽  
Heat Treated

Nitrogen doping can be achieved by heating TiO2-based photocatalyst powders under dopant-generating atmospheres such as NH3. In the present work, metatitanic acid (MTA) powder was used as a raw material to obtain nitrogen-doped titania using heat treatment in NH3flow. MTA is an industrially available intermediate product in sulfate process for TiO2production, which is mesoporous material with high specific surface area. The MTA powder was heat-treated in flowing NH3at 400–550°C. For comparison, commercial P25 TiO2powder was heat-treated under the same conditions. The results show that nitrogen dopant can be successfully incorporated into the MTA by heating in NH3 atmosphere. This obviously results in the enhanced visible-light photocatalytic activity, especially in MTA sample heated at 400°C. Due to the fascinating properties of MTA powder such as high specific surface area, the N-doping effect on MTA powder is much higher than the P25 TiO2powder.

An α-Bi2O3/BiOBr core–shell heterojunction with high photocatalytic activity

2017 ◽  
Vol 46 (7) ◽  
pp. 2310-2321 ◽  
Author(s):  
Lianwei Shan ◽  
Yuteng Liu ◽  
Hongtao Chen ◽  
Ze Wu ◽  
Zhidong Han
Keyword(s):  
Photocatalytic Activity ◽  
Specific Surface ◽  
Surface Area ◽  
Chemical Transformation ◽  
Specific Surface Area ◽  
Transformation Method ◽  
High Specific Surface Area ◽  
High Photocatalytic Activity ◽  
Core Shell

We prepared α-Bi2O3/BiOBr core–shell heterojunction via a facile in situ chemical transformation method. The prepared α-Bi2O3/BiOBr photocatalyst is characteristic of porous and high specific surface area, and shows high photocatalytic activity.

Nanostructured BN–TiO2 composite with ultra-high photocatalytic activity

2017 ◽  
Vol 41 (20) ◽  
pp. 11640-11646 ◽  
Author(s):  
Bikramjeet Singh ◽  
Gurpreet kaur ◽  
Paviter Singh ◽  
Kulwinder Singh ◽  
Jeewan Sharma ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Boron Nitride ◽  
Specific Surface ◽  
Pore Size ◽  
Surface Area ◽  
Titanium Oxide ◽  
Specific Surface Area ◽  
High Specific Surface Area ◽  
High Photocatalytic Activity ◽  
Large Pore Size

Boron nitride and titanium oxide composite (BN–TiO2) photocatalyst endowed with high specific surface area and large pore size was synthesized by ice bath method.

scholarly journals Nanoporous Quasi-High-Entropy Alloy Microspheres

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 345 ◽  
Author(s):  
Lianzan Yang ◽  
Yongyan Li ◽  
Zhifeng Wang ◽  
Weimin Zhao ◽  
Chunling Qin
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
High Specific Surface Area ◽  
High Entropy Alloy ◽  
Face Centered Cubic ◽  
High Entropy ◽  
Hierarchical Porous

High-entropy alloys (HEAs) present excellent mechanical properties. However, the exploitation of chemical properties of HEAs is far less than that of mechanical properties, which is mainly limited by the low specific surface area of HEAs synthesized by traditional methods. Thus, it is vital to develop new routes to fabricate HEAs with novel three-dimensional structures and a high specific surface area. Herein, we develop a facile approach to fabricate nanoporous noble metal quasi-HEA microspheres by melt-spinning and dealloying. The as-obtained nanoporous Cu30Au23Pt22Pd25 quasi-HEA microspheres present a hierarchical porous structure with a high specific surface area of 69.5 m2/g and a multiphase approximatively componential solid solution characteristic with a broad single-group face-centered cubic XRD pattern, which is different from the traditional single-phase or two-phase solid solution HEAs. To differentiate, these are named quasi-HEAs. The synthetic strategy proposed in this paper opens the door for the synthesis of porous quasi-HEAs related materials, and is expected to promote further applications of quasi-HEAs in various chemical fields.

Sign in / Sign up

Export Citation Format

Share Document