scholarly journals PMMA-TiO2 Fibers for the Photocatalytic Degradation of Water Pollutants

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1279
Author(s):  
Namrata Kanth ◽  
Weiheng Xu ◽  
Umesh Prasad ◽  
Dharneedar Ravichandran ◽  
Arunachala Mada Kannan ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Environmental Remediation ◽  
Photocatalytic Performance ◽  
Fixed Bed ◽  
Core Shell ◽  
Surface Areas ◽  
Degradation Rates ◽  
Wet Phase Inversion ◽  
Physical Geometry ◽  
Cost Efficient

Titanium dioxide (TiO2) is a promising photocatalyst that possesses a redox potential suitable for environmental remediation applications. A low photocatalytic yield and high cost have thus far limited the commercial adoption of TiO2-based fixed-bed reactors. One solution is to engineer the physical geometry or chemical composition of the substrate to overcome these limitations. In this work, porous polymethyl methacrylate (PMMA) substrates with immobilized TiO2 nanoparticles in fiber forms were fabricated and analyzed to demonstrate the influence of contaminant transport and light accessibility on the overall photocatalytic performance. The influences of (i) fiber porosity and (ii) fiber architecture on the overall photocatalytic performance were investigated. The porous structure was fabricated using wet phase inversion. The core-shell-structured fibers exhibited much higher mechanical properties than the porous fibers (7.52 GPa vs. non-testability) and maintained the same degradation rates as porous structures (0.059 vs. 0.053/min) in removing methylene blue with comparable specific surface areas. The highest methylene blue (MB) degradation rate (kMB) of 0.116 min−1 was observed due to increases of the exposed surface area, pointing to more efficient photocatalysis by optimizing core-shell dimensions. This research provides an easy-to-manufacture and cost-efficient method for producing PMMA/TiO2 core-shell fibers with a broad application in water treatment, air purification, and volatile sensors.

A core–shell TiO2@C nano-architecture: facile synthesis, enhanced visible photocatalytic performance and electrochemical capacitance

RSC Advances ◽  
2015 ◽  
Vol 5 (77) ◽  
pp. 62424-62432 ◽  
Author(s):  
Linrui Hou ◽  
Hui Hua ◽  
Hui Cao ◽  
Siqi Zhu ◽  
Changzhou Yuan
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Visible Light Irradiation ◽  
Photocatalytic Performance ◽  
Light Irradiation ◽  
Core Shell ◽  
Facile Synthesis ◽  
Electrochemical Capacitance ◽  
Electrochemical Behaviors

A mesoporous core–shell TiO2@C nanohybrid exhibited remarkable photocatalytic degradation efficiency and stability for methylene blue under visible light irradiation, and attractive electrochemical behaviors for electrochemical capacitors.

scholarly journals In-Situ Construction of Bi2O3/Bi2SiO5 Heterojunction Photocatalyst On The Exfoliated Bentonite With Efficient Photocatalytic Performance

2021 ◽  
Author(s):  
Tao Nie ◽  
Ben Chen ◽  
Yuyang Huang ◽  
Rui Wang ◽  
Beibei He ◽  
...  
Keyword(s):  
Photocatalytic Performance ◽  
One Pot ◽  
Characterization Methods ◽  
Contaminant Degradation ◽  
Simulated Solar Light ◽  
Surface Areas ◽  
Photocatalytic Application ◽  
Cost Efficient ◽  
The Cost

Abstract In this study, Bi2O3/Bi2SiO5 heterojunction were in-situ constructed on the exfoliated bentonite via a novel one-pot method. The crystal structure, morphology, and optical features for the as-synthesized Bi2O3/Bi2SiO5 heterojunctions were systematically characterized by a series of characterization methods. During the preparation process, the exfoliated bentonite acted as the Si source and framework for the in-situ formation of Bi2O3/Bi2SiO5 p-n heterogeneous junction on the bentonite interlayer. As a result, the Bi2O3/Bi2SiO5 photocatalyst exhibited a superior photocatalytic performance than that of bare α-Bi2O3 toward the decomposition of Rhodamine B (RhB) via the simulated solar light irradiation, which was due to the synergetic effects of large specific surface areas and p-n junction between Bi2SiO5 and Bi2O3. Moreover, a probable photocatalytic mechanism for the as-prepared photocatalysts was explored. This work provides a new insight into building the cost-efficient photocatalysts for the contaminant degradation and a latent photocatalytic application of bentonite.

THE PREPARATION AND APPLICATION OF MAGNETIC NANOPARTICLES WITH CORE-SHELL STRUCTURE

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1523-1528 ◽  
Author(s):  
ZHEN PENG ◽  
KE-FU YAO ◽  
ZHENHUA LIAO ◽  
WENPENG FU
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Magnetic Nanoparticles ◽  
Photocatalytic Degradation ◽  
Photocatalytic Performance ◽  
High Photocatalytic Activity ◽  
Core Shell ◽  
Economic Consideration ◽  
Wastewater Purification ◽  
The Cost

It is well-known that TiO 2 nanoparticles are highly efficient photocatalysts in decomposing organic substance in wastewater, especially when they are used in suspension state. However, if TiO 2 nanoparticles cannot be withdrawn and reused, it is difficult to apply them in purification of wastewater due to the economic consideration. In present work, TiO 2/ SiO 2/ Fe 3 O 4 core-shell magnetic nanoparticles, constituted by Fe 3 O 4 core, SiO 2 intermediary layer and the TiO 2 out-shell, have been prepared and applied in photocatalytic degradation of a modulated methylene blue containing water. The results indicate that the as-prepared TiO 2/ SiO 2/ Fe 3 O 4 nanoparticles possess high photocatalytic activity and the methylene blue in wastewater can be degraded quickly. Through comparing with the photocatalytic performance of the famous commercial P 25 TiO 2 nanoparticles in the same reaction condition, it has been found that as-prepared TiO 2/ SiO 2/ Fe 3 O 4 nanoparticles exhibit similar photocatalytic activity to commercial P 25 TiO 2 nanoparticles in the photocatalytic degradation of methylene blue containing water. But the TiO 2/ SiO 2/ Fe 3 O 4 nanoparticles used in suspension state can be simply recovered from the liquid by using a magnet or a magnetic field. So the cost of wastewater purification by photocatalytic degradation with TiO 2/ SiO 2/ Fe 3 O 4 nanoparticles can be significantly reduced through reuse of the photocatalyst. It implies that TiO 2/ SiO 2/ Fe 3 O 4 nanoparticles possess the potential for industrial application.

scholarly journals Effect of Nitrogen-Doped Carbon Dots (NCDs) on the Characteristics of NCD/MIL-53(Fe) Composite and Its Photocatalytic Performance for Methylene Blue Degradation under Visible Light

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Ngoc Tue Nguyen ◽  
Xuan Truong Nguyen ◽  
Duc-Trung Nguyen ◽  
Hong Minh Tran ◽  
Thi May Nguyen ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Carbon Dots ◽  
Environmental Remediation ◽  
Photocatalytic Performance ◽  
Removal Rate ◽  
Metal Organic Framework ◽  
Sem Images ◽  
Methylene Blue Degradation ◽  
Metal Organic ◽  
Organic Framework

Metal-organic framework composites, which are combined from metal-organic framework and advanced carbon material, have drawn great attention in many fields of application such as environmental remediation and catalysts. Within this paper, the carbon/MIL-53(Fe) composite was fabricated via an in situ synthesis, in which N-containing carbon dots (NCDs) were mixed with MOF precursors’ solutions under various ratios before going through the solvothermal stage. It was showed that the introduction of a certain amount of NCDs would affect characteristic features and improve the photocatalytic performance of final products. The optimal doping content of NCDs in NCD/MIL-53(Fe) composite was determined. SEM images showed that the M-140 appeared as hexagonal bipyramid-shaped crystals with an average size of 700 nm. Compared with pristine MIL-53(Fe), the M-140 was more visibly light-responsive, and its calculated band gap energy was approximately 2.3 eV. In addition, M-140 catalyst also displayed more excellent photocatalytic activity for Methylene Blue degradation in a pH range from 5 to 7. Under optimal conditions, MB was achieved within 60 minutes and the removal rate was nearly 100% after 5 cycles. The photocatalytic mechanism of the obtained NCD/MIL-53(Fe) composite was discussed.

S-doped Na2Ti6O13@TiO2 core–shell nanorods with enhanced visible light photocatalytic performance

2015 ◽  
Vol 17 (23) ◽  
pp. 15165-15172 ◽  
Author(s):  
Chao Liu ◽  
Ji-yuan Liang ◽  
Rui-rui Han ◽  
Yong-zheng Wang ◽  
Jin Zhao ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Performance ◽  
Combined Effect ◽  
Core Shell ◽  
Visible Light Photocatalytic Activity ◽  
Morphology Engineering ◽  
Visible Light Photocatalytic

S-doped Na2Ti6O13@TiO2 core–shell nanorods with exposed anatase {101} facets showed enhanced visible-light photocatalytic activity and stability for the degradation of methylene blue owing to the combined effect of hybridization, morphology engineering and S doping.

Synergistic and Competitive Adsorption of Methylene Blue and Rhodamine B on Core-shell Magnetic Manganese Dioxide Nanocomposites

2017 ◽  
Vol 13 (6) ◽  
Author(s):  
Linshan Wang ◽  
Cholhwan Kim ◽  
Xinyue Zhang ◽  
Carlos Fernandez ◽  
Ting Sun ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Manganese Dioxide ◽  
Rhodamine B ◽  
Competitive Adsorption ◽  
Core Shell

scholarly journals SnS2/TiO2 Nanocomposites for Hydrogen Production and Photodegradation Under Extended Solar Irradiation

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 589
Author(s):  
Sivagowri Shanmugaratnam ◽  
Balaranjan Selvaratnam ◽  
Aravind Baride ◽  
Ranjit Koodali ◽  
Punniamoorthy Ravirajan ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Hydrogen Evolution ◽  
Environmental Remediation ◽  
High Performance ◽  
Degradation Mechanism ◽  
Solar Irradiation ◽  
Earth Abundant ◽  
Improved Performance ◽  
Chalcogenide Materials

Earth–abundant transition metal chalcogenide materials are of great research interest for energy production and environmental remediation, as they exhibit better photocatalytic activity due to their suitable electronic and optical properties. This study focuses on the photocatalytic activity of flower-like SnS2 nanoparticles (composed of nanosheet subunits) embedded in TiO2 synthesized by a facile hydrothermal method. The materials were characterized using different techniques, and their photocatalytic activity was assessed for hydrogen evolution reaction and the degradation of methylene blue. Among the catalysts studied, 10 wt. % of SnS2 loaded TiO2 nanocomposite shows an optimum hydrogen evolution rate of 195.55 µmolg−1, whereas 15 wt. % loading of SnS2 on TiO2 exhibits better performance against the degradation of methylene blue (MB) with the rate constant of 4.415 × 10−4 s−1 under solar simulated irradiation. The improved performance of these materials can be attributed to the effective photo-induced charge transfer and reduced recombination, which make these nanocomposite materials promising candidates for the development of high-performance next-generation photocatalyst materials. Further, scavenging experiments were carried out to confirm the reactive oxygen species (ROS) involved in the photocatalytic degradation. It can be observed that there was a 78% reduction in the rate of degradation when IPA was used as the scavenger, whereas around 95% reduction was attained while N2 was used as the scavenger. Notably, very low degradation (<5%) was attained when the dye alone was directly under solar irradiation. These results further validate that the •OH radical and the superoxide radicals can be acknowledged for the degradation mechanism of MB, and the enhancement of degradation efficiency may be due to the combined effect of in situ dye sensitization during the catalysis and the impregnation of low bandgap materials on TiO2.

ZIF-8 calcination derived Cu2O-ZnO* material for enhanced visible-light photocatalytic performance

2021 ◽  
Author(s):  
YiLin Yin ◽  
Jingchao Liu ◽  
Zengnan Wu ◽  
Ting Zhang ◽  
Zenghe Li
Keyword(s):  
Solar Cells ◽  
Visible Light ◽  
Environmental Remediation ◽  
Photocatalytic Performance ◽  
Morphology Control ◽  
Visible Light Photocatalytic

As one of the most essential semiconductors, ZnO has been widely used for solar cells, photocatalysis, environmental remediation, etc. Doping and morphology control of ZnO can significantly improve the efficiency...

Sign in / Sign up

Export Citation Format

Share Document