scholarly journals BiOBr Precursor Solutions Modified Cement Paste: The Photocatalytic Performance and Effects

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 969
Author(s):  
Zhi Geng ◽  
Lina Zhang ◽  
Jin Wang ◽  
Yanfeng Yu ◽  
Guoling Zhang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Cement Paste ◽  
Photocatalytic Performance ◽  
Performance Enhancement ◽  
Environmental Pollutants ◽  
Hydrothermal Conditions ◽  
Curing Period ◽  
Cement Based Materials ◽  
Activity Enhancement

The potential of photocatalysts modified cement-based materials in degrading environmental pollutants is evident in previous studies, but the application of photocatalytic cement-based materials still appears limited in actual practice due to the dispersion effect. This work seeks to prepare photocatalytic cement paste by mixing cement with BiOBr precursor solutions in terms of the improvement of dispersion efficiency, and additional hydrothermal conditions provided by autoclaved curing period are required to activate the photocatalytic activity of photocatalysts crystals. The presence of BiOBr precursor solutions results in an increase of RhB degradation rate of up to 45.4% and the NOx removal efficiency was up to 4.4%, and the formation of BiOBr photocatalysts crystals is the main reason for photocatalytic performance enhancement. The morphology of photocatalysts and the pore size distribution of cement paste also contribute to the photocatalytic activity enhancement by the exposed surface of photocatalysts, which are supported by the analyses of Scanning Electron Microscope and Mercury Intrusion Porosimetry results. A new mechanism is suggested to explain the synergistic role of crystals and microstructure on the enhancement of photocatalytic activity with the extension of autoclaved curing time. As supports for photocatalysts, the development changes of compressive strength of cement paste are also discussed.

Photocatalytic performance of Pd decorated TiO2–CdO composite: Role of in situ formed CdS in the photocatalytic activity

2015 ◽  
Vol 40 (39) ◽  
pp. 13431-13442 ◽  
Author(s):  
Sanjay B. Kokane ◽  
S.D. Sartale ◽  
K.G. Girija ◽  
Jagannath ◽  
R. Sasikala
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Performance

The Hydrothermal Synthesis and Photocatalysis of TiO2 Powders

2011 ◽  
Vol 183-185 ◽  
pp. 2024-2027
Author(s):  
Li Ming Jiang
Keyword(s):  
Photocatalytic Activity ◽  
Hydrothermal Synthesis ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Organic Molecule ◽  
Photocatalytic Performance ◽  
Hydrothermal Conditions ◽  
Anatase Structure

Titania powders were prepared under hydrothermal conditions by employing organic molecule β-cyclodextrin(CD) as template, and characterized by means of TGA、XRD、BET . The effects of the pH on the specific surface area and photocatalytic performance of titania were discussed. The results showed that titania powders were anatase structure;the titania powders with specific surface area up to 216.2 m2g-1 were prepared while the system pH was about 1 , and the powders had the best photocatalytic activity.

Comprehensive investigation of the reciprocity of structure and enhanced photocatalytic performance in finned-tube structured TiO2/BiOBr heterojunctions

RSC Advances ◽  
2015 ◽  
Vol 5 (124) ◽  
pp. 102228-102237 ◽  
Author(s):  
Chao Xue ◽  
Xin Xu ◽  
Guidong Yang ◽  
Shujiang Ding
Keyword(s):  
Photocatalytic Activity ◽  
Formation Mechanism ◽  
Photocatalytic Performance ◽  
Finned Tube ◽  
Comprehensive Investigation ◽  
Activity Enhancement

The formation mechanism of the as-prepared 1D finned-tube structured TiO2@BiOBr heterojunctions and a possible mechanism of the photocatalytic activity enhancement were proposed.

Anatase-Type Ti1-2xNbxAlxO2 Solid Solution/Silica (SiO2) Composite Nanoparticles: Synthesis, Phase Stability, and Photocatalytic Performance

2010 ◽  
Vol 654-656 ◽  
pp. 2735-2738
Author(s):  
Masanori Hirano ◽  
Norio Kuno
Keyword(s):  
Solid Solution ◽  
Phase Transformation ◽  
Photocatalytic Activity ◽  
Photocatalytic Performance ◽  
Rutile Phase ◽  
Silica Content ◽  
Composite Nanoparticles ◽  
Hydrothermal Conditions ◽  
Nanoparticles Synthesis ◽  
Hydrolysis Of

Composite nanoparticles (anatase-type Ti1-2XNbXAlXO2 solid solution/SiO2) were directly synthesized from precursor solutions in the presence of urea under mild hydrothermal conditions at 180 °C for 5 h. The crystallite size of anatase was gradually decreased with increased silica content in the composite nanoparticles formed under weakly basic hydrothermal conditions via the hydrolysis of urea. The composite nanoparticles with composition Ti0.9Nb0.05Al0.05O2/SiO2 = 100/10 mol% showed good photocatalytic activity. The anatase-to-rutile phase transformation in the course of heating in air was retarded to maintain the anatase-type structure up to more than 1050 °C without a trace of rutile phase by the formation of composite nanoparticles (Ti0.90Nb0.05Al0.05O2/SiO2 = 100/20 mol%) with amorphous silica.

Three-dimensional Gd-doped TiO2 fibrous photoelectrodes for efficient visible light-driven photocatalytic performance

RSC Advances ◽  
2014 ◽  
Vol 4 (23) ◽  
pp. 11750-11757 ◽  
Author(s):  
Junghyun Choi ◽  
P. Sudhagar ◽  
P. Lakshmipathiraj ◽  
Jung Woo Lee ◽  
Anitha Devadoss ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Performance ◽  
Three Dimensional ◽  
Electrode Geometry ◽  
Doped Tio2 ◽  
Visible Light Driven

Demonstration of the role of electrode geometry on in situ Gd-doping and their effects in the photocatalytic activity.

scholarly journals Damage Detection of Carbon Nanotube Cementitious Composites Using Thermal and Electrical Resistance Properties

2021 ◽  
Vol 11 (7) ◽  
pp. 2955
Author(s):  
Heeyoung Lee ◽  
Wonjun Yu ◽  
Wonseok Chung
Keyword(s):  
Carbon Nanotube ◽  
Cement Paste ◽  
Electrical Resistance ◽  
Curing Period ◽  
Mwcnt Concentration ◽  
Experimental Parameters ◽  
Cement Based Materials ◽  
Multi Walled Carbon Nanotubes ◽  
Heat Property ◽  
Walled Carbon Nanotubes

This study aimed to detect damage based on thermal and electrical resistance properties by fabricating composites in which multi-walled carbon nanotubes (MWCNTs) and cement-based materials are mixed. The experimental parameters used were the cement-based material type, MWCNT concentration, curing period, and presence of damage. The experimental results showed that damage in cement paste can be detected using the heat property at every MWCNT concentration, and damage in mortar can be detected at MWCNT concentrations of ≤0.25 wt%. However, damage to concrete is difficult to detect using the heat property. Damage to cement paste, mortar, and concrete can be detected at every concentration using the electrical resistance property. Furthermore, field emission scanning electron microscopy (FE-SEM) results revealed uniformly dispersed MWCNTs inside the composites without agglomeration or the formation of carbon nanotube (CNT) networks.

scholarly journals Influence of recycled polystyrene beads on cement paste properties

2018 ◽  
Vol 149 ◽  
pp. 01032 ◽  
Author(s):  
Maroua Maaroufi ◽  
Akli Younsi ◽  
Rafik Belarbi ◽  
Armelle Nouviaire
Keyword(s):  
Sustainable Development ◽  
Cement Paste ◽  
Building Materials ◽  
Polystyrene Beads ◽  
Experimental Campaign ◽  
Cement Based Materials ◽  
Polystyrene Waste ◽  
Mass Transfers ◽  
Paste Properties

In order to keep up with the requirements of sustainable development, there is a growing interest towards reducing the energy consumption in the construction and rehabilitation of buildings and the promotion of recycling waste in building materials. The use of recycled polystyrene beads in cement-based materials composition constitutes a solution to improve the insulation in buildings. This allows also limiting landfill by reusing the polystyrene waste. The aim of this study is to compare some properties and performances of a cement paste containing polystyrene beads to a reference paste designed with only the same cement. An experimental campaign was conducted and the obtained results showed that adding recycled polystyrene beads to a cement paste improves its hygro-thermal properties. Further studies are however necessary to better understand the real role of the polystyrene beads in the heat and mass transfers.

N-doped ZnO–MoS2 binary heterojunctions: the dual role of 2D MoS2 in the enhancement of photostability and photocatalytic activity under visible light irradiation for tetracycline degradation

2017 ◽  
Vol 1 (6) ◽  
pp. 1093-1106 ◽  
Author(s):  
Suneel Kumar ◽  
Vipul Sharma ◽  
Kaustava Bhattacharyya ◽  
Venkata Krishnan
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Photocatalytic Performance ◽  
Dual Role ◽  
Light Irradiation ◽  
Tetracycline Degradation ◽  
Doped Zno

In this work, we demonstrate the dual role played by MoS2 in enhancing the photocatalytic performance and in increasing the photostability of the N-ZnO material.

Controlling electronic properties of MoS2/graphene oxide heterojunctions for enhancing photocatalytic performance: the role of oxygen

2018 ◽  
Vol 20 (3) ◽  
pp. 1974-1983 ◽  
Author(s):  
Xiaotian Hua ◽  
Xinguo Ma ◽  
Jisong Hu ◽  
Hua He ◽  
Guowang Xu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Electronic Properties ◽  
Photocatalytic Performance ◽  
Photocatalytic Efficiency ◽  
Interlayer Interaction ◽  
Theoretical Understanding ◽  
The Relationship

The manipulation of the constituents of novel hetero-photocatalysts is an effective method for improving photocatalytic efficiency, but a theoretical understanding of the relationship between interlayer interaction and photocatalytic activity is still lacking.

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