scholarly journals Ionic Liquid-Assisted Synthesis of Ag3PO4 Spheres for Boosting Photodegradation Activity under Visible Light

Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 788
Author(s):  
Beibei Zhang ◽  
Lu Zhang ◽  
Yulong Zhang ◽  
Chao Liu ◽  
Jiexiang Xia ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Visible Light ◽  
High Efficiency ◽  
Chemical Precipitation ◽  
Active Species ◽  
Precipitation Method ◽  
Dihydrogen Phosphate ◽  
Xrd Pattern ◽  
Simple Chemical ◽  
Visible Light Driven

In this work, a simple chemical precipitation method was employed to prepare spherical-like Ag3PO4 material (IL-Ag3PO4) with exposed {111} facet in the presence of reactive ionic liquid 1-butyl-3-methylimidazole dihydrogen phosphate ([Omim]H2PO4). The crystal structure, microstructure, optical properties, and visible-light photocatalytic performance of as-prepared materials were studied in detail. The addition of ionic liquids played a crucial role in forming spherical-like morphology of IL-Ag3PO4 sample. Compared with traditional Ag3PO4 material, the intensity ratio of {222}/{200} facets in XRD pattern of IL-Ag3PO4 was significantly enhanced, indicating the main {111} facets exposed on the surface of IL-Ag3PO4 sample. The presence of exposed {111} facet was advantageous for facilitating the charge carrier transfer and separation. The light-harvesting capacity of IL-Ag3PO4 was larger than that of Ag3PO4. The photocatalytic activity of samples was evaluated by degrading rhodamine B (RhB) and p-chlorophenol (4-CP) under visible light. The photodegradation efficiencies of IL-Ag3PO4 were 1.94 and 2.45 times higher than that of Ag3PO4 for RhB and 4-CP removal, respectively, attributing to a synergy from the exposed {111} facet and enhanced photoabsorption. Based on active species capturing experiments, holes (h+), and superoxide radical (•O2−) were the main active species for visible-light-driven RhB photodegradation. This study will provide a promising prospect for designing and synthesizing ionic liquid-assisted photocatalysts with a high efficiency.

INVESTIGATIONS ON CHITOSAN/α-Fe O NANOCOMPOSITE FOR 2 3 EFFICIENT ANTIBACTERIAL ACTIVITY

2021 ◽  
pp. 67-69
Author(s):  
M. Senthilkumar ◽  
R. Pandimurugan ◽  
M. Muthuvinayagam
Keyword(s):  
Escherichia Coli ◽  
Antibacterial Activity ◽  
Xrd Analysis ◽  
Chemical Precipitation ◽  
Precipitation Method ◽  
Visible Spectroscopy ◽  
Visible Absorption ◽  
Xrd Pattern ◽  
Simple Chemical ◽  
Uv Visible

Chitosan capped with α-Fe O nanocomposite was prepared by simple chemical precipitation method. The synthesized 2 3 Chitosan/α-Fe O nanocomposite was characterised by FTIR, UV–visible spectroscopy and XRD analysis. These results 2 3 showed that α-Fe O nanoparticles were successfully grown on the surface of chitosan. The FTIR vibrational peaks conrm the blending between 2 3 Chitosan and α-Fe O nanoparticles. Chitosan/α-Fe O nanocomposite. 2 3 2 3 Ultraviolet-Visible absorption spectra explain the optical property of The sharp peaks in XRD pattern indicate the increase in crystallinity nature of Chitosan/α-Fe O nanocomposite. Finally, the prepared Chitosan/α- 2 3 Fe O nanocomposite was tested for antibacterial activity against Staphylococcus aureus and Escherichia coli.

SBA-15 Templated Mesoporous Graphitic C3N4 for Remarkably Enhanced Photocatalytic Degradation of Organic Pollutants under Visible Light

NANO ◽  
2019 ◽  
Vol 14 (11) ◽  
pp. 1950136 ◽  
Author(s):  
Hongjin Liu ◽  
Haining Wu ◽  
Jun Lv ◽  
Guangqing Xu ◽  
Xing Chen ◽  
...  
Keyword(s):  
Visible Light ◽  
Organic Pollutants ◽  
Visible Light Irradiation ◽  
High Efficiency ◽  
Active Species ◽  
Light Irradiation ◽  
Radical Trapping ◽  
Ordered Mesoporous ◽  
Visible Light Driven ◽  
Reaction Processes

Organic pollutants in water have been threatening public and environmental health. Developing efficient and sustainable photocatalysts working for degradation of organic pollutants under visible light becomes a big challenge. In this paper, high-efficiency visible light driven catalyst ordered mesoporous graphite nitride carbon (mpg-C3N4) was prepared by using SBA-15 as template and dicyandiamide (C2H4N4) as precursor. The specific surface area of mpg-C3N4 can be increased remarkably as compared to that of the bulk graphite nitrite carbon (g-C3N4) by adjusting the ratio of SBA-15 to dicyandiamide. Photocatalytic performance of mpg-C3N4 were evaluated systematically by degradation of Rhodamine B (RhB), malachite green (MG) and tetracycline hydrochloride (TC) under visible light irradiation. The results showed that the mpg-C3N4 (1:0.5) has the highest photocatalytic activity and stability and the degradation rate is for RhB, MG and TC are all more than seven times that of bulk g-C3N4. After five recycling runs, the mpg-C3N4 (1:0.5) remains high photocatalytic activities for the degradation of MG (94%) and TC (81%), respectively. Additionally, radical trapping experiments certified that the main active species are [Formula: see text] and h[Formula: see text], while the role of [Formula: see text]OH is irrelevant in the reaction processes. This work provides a promising pathway to prepare metal-free photocatalyst for degradation of organic pollutants under visible light irradiation.

Structural and morphological characterization of CdS nanoparticles

2020 ◽  
Vol 10 ◽  
Author(s):  
Manish Dwivedi ◽  
Vijay Tripathi ◽  
Dhruv Kumar ◽  
Dwijendra K. Gupta
Keyword(s):  
Blue Shift ◽  
Chemical Precipitation ◽  
Morphological Characterization ◽  
Precipitation Method ◽  
Cds Nanoparticles ◽  
Cubic Phase ◽  
Simple Chemical ◽  
Xrd Patterns ◽  
Average Size ◽  
Physical Tools

Aims: CdS nanoparticles are an attractive material having application in various field like as pigment in paints, biotag for bioimaging and many more optoelectronic as well as biological applications. Present study aims to synthesize and characterize the CdS nanoparticles to make it applicable in different areas Objectives: Preparation CdS nanoparticles by using simple and facile chemical methods and further physical and structural characterization using various physical tools Methods: In present work CdS nanoparticles has been synthesized by using rationally simple chemical precipitation method with some modi-fication on temperature and incubation time in existed methods. Characterizations were done by employing XRD, SEM, TEM, AFM tech-niques Results: Simple chemical method produces the CdS nanoparticles with the size about 100-200 nm in length and 5-10 nm in diameter. The SEM studies show that the CdS nanoparticles can agglomerate and form a continuous network like structure. The X-ray diffraction (XRD) measurements show the single-phase formation of CdS nanoparticles with the structure of cubic phase, and the broadening of XRD patterns indicates that the prepared samples are nanostructured. Our analysis on CdS nanoparticles by using transmission electron microscope and atomic force microscope (AFM) revealed that the nanoparticles form both spherical and nearly rod shaped with the average size applicable for biotagging. UV-Vis spectroscopic analysis reveals blue shift in the absorption peak probably caused by quantum confinement Conclusion: The observed CdS nanoparticles were appeared yellow in color. The XRD pattern of the CdS nanoparticles showed that the materials were of nanometric sized regime with a predominantly cubic phase along with the rod and round morphology. The study and char-acterization of CdS nanoparticles will bring us a new approach to understand biological problem by tagging nanoparticles with biomolecules and further suggests that the CdS nanoparticles formulate it more suitable biocompatible nanomaterial for biotagging and bioimaging

Construction of hollow In2S3/CdIn2S4 heterostructures with high efficiency for Cr(vi) reduction

2021 ◽  
Author(s):  
Cheng Cheng ◽  
Dongyun Chen ◽  
Najun Li ◽  
Hua Li ◽  
Qingfeng Xu ◽  
...  
Keyword(s):  
Visible Light ◽  
High Efficiency ◽  
Visible Light Driven

A hollow constructed photocatalyst, In2S3/CdIn2S4, was synthesized for visible-light-driven Cr(vi) reduction.

scholarly journals Facile Low-Temperature Synthesis of Carbon Nanotube/ Nanohybrids with Enhanced Visible-Light-Driven Photocatalytic Activity

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Yunlong Xie ◽  
Huanhuan Qian ◽  
Yijun Zhong ◽  
Hangming Guo ◽  
Yong Hu
Keyword(s):  
Carbon Nanotubes ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Chemical Precipitation ◽  
Hybrid Structures ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Titanium Sulfate ◽  
Visible Light Driven ◽  
Degussa P25

We demonstrate a facile and novel chemical precipitation strategy for the accurate coating of TiO2nanoparticles on the surface of carbon nanotubes (CNTs) to form CNT/TiO2nanohybrids, which only requires titanium sulfate and CNTs as starting materials and reacts in the alkaline solution at 60°C for 6 h. Using this process, the as-prepared hybrid structures preserved the good dispersity and uniformity of initial CNTs. Furthermore, the CNT/TiO2nanohybrids show a broad blue luminescence at 469 nm and exhibit significantly enhanced photocatalytic activity for the degradation of rhodamine B (RhB) under visible-light irradiation, which is about 1.5 times greater than that of commercial Degussa P25 TiO2nanoparticles. It is believed that this facile chemical precipitation strategy is scalable and its application can be extended to synthesize other CNT/oxide nanohybrids for various applications.

Construction of a novel 2D-2D heterojunction by coupling covalent organic framework and In2S3 for photocatalytic removal of organic pollutants with high efficiency

2021 ◽  
Author(s):  
Luqiu Li ◽  
Dongguang Yin ◽  
Xiandi Guo
Keyword(s):  
Visible Light ◽  
Hydrogen Evolution ◽  
Organic Pollutants ◽  
High Efficiency ◽  
Crystalline Material ◽  
Charge Carriers ◽  
Covalent Organic Frameworks ◽  
Covalent Organic Framework ◽  
Photocatalytic Removal ◽  
Visible Light Driven

Covalent organic frameworks (COFs) representing an emerging class of porous crystalline material have shown promising visible-light-driven hydrogen evolution activity. However, they have a high recombination ratio of charge carriers and...

Hydrolysis synthesis route for (001)/(102) coexposed BiOCl nanosheets with high visible light-driven catalytic performance

2021 ◽  
Author(s):  
Jingjing Guo ◽  
Wei Zhao ◽  
Dezhi Xiong ◽  
Yao Ye ◽  
Shibo Li ◽  
...  
Keyword(s):  
Visible Light ◽  
High Efficiency ◽  
Catalytic Performance ◽  
Energy Usage ◽  
Synthesis Route ◽  
Carrier Recombination ◽  
Visible Light Driven ◽  
Sunlight Energy

High-efficiency sunlight energy usage and low carrier recombination are of the most significant attentions to explore novel photocatalyst candidates. Herein the BiOCl nanosheets showing various (001)/(102) facet ratios were synthesized...

In situ synthesis of hierarchical nitrogen-doped MoS2 microsphere with an excellent visible light-driven photocatalytic nitrogen fixation ability

2020 ◽  
Vol 13 (05) ◽  
pp. 2051031
Author(s):  
Abulikemu Abulizi ◽  
Hujiabudula Maimaitizi ◽  
Dilinuer Talifu ◽  
Yalkunjan Tursun
Keyword(s):  
Visible Light ◽  
High Performance ◽  
Nucleation Site ◽  
Active Species ◽  
Nitrogen Doped ◽  
Photogenerated Electrons ◽  
The Hierarchical Structure ◽  
Visible Light Driven

A photocatalyst of high-performance hierarchical nitrogen-doped MoS2 (N-MoS2) microsphere was fabricated by an in situ hydrothermal method in the presence of cetyltrimethylammonium bromide (CTAB). The as-prepared N-MoS2 microsphere was self-assembled by extremely thin interleaving petals, where CTAB acts as a nucleation site for the formation of the interleaving petals due to the strong interaction between CTA+ and [Formula: see text]. N-MoS2 showed higher N2 fixation ability (101.2 [Formula: see text] mol/g(cat)h) than the non-doped MoS2 under the visible light irradiation, and the improved photocatalytic activity could be ascribed to that the doped N narrows the band gap, and the surface reflecting and scattering effect caused by the hierarchical structure enhance the light adsorption. The trapping experiment of active species was also investigated to evaluate the role of photogenerated electrons in the photocatalytic reaction process. Meanwhile, the possible mechanism for the formation and excellent photocatalytic performance of N-MoS2 microsphere were also presented.

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