scholarly journals Synergetic Effect of Carbon Dot at Cellulose Nanofiber for Sustainable Metal-free Photocatalyst

2021 ◽  
Author(s):  
Jungbin Ahn ◽  
Sewon Pak ◽  
Hyungsup Kim
Keyword(s):  
Photocatalytic Performance ◽  
Synergetic Effect ◽  
Cellulose Nanofiber ◽  
Electron Recombination ◽  
Electron Hole ◽  
Carbon Dot ◽  
Metal Free ◽  
Photocatalytic Effect ◽  
Recombination Pathway

Abstract Metal-free photocatalyst was synthesized by attaching carbon dot (CD) to cellulose nanofiber (CNF) via simple in-situ synthesis. The graphitic core and functional groups of CD on CNF was controlled along the precursor concentration, while the fibrous structure of CNF was intact. The optical property of the samples was profoundly analyzed focusing on the electron recombination pathway. It reveals that the excited electrons in the CD transferred to the CNF and delayed the radiative recombination. The electron-hole pairs were efficiently separated in the composite where abundant amide group and sulfide bonding existed. The CD on the CNF surface improved the morphological stability of CNF under UV irradiation as well. As a result, the composite showed superior photocatalytic performance to degrade 98% of MB molecules within 25 min. The aerogel synthesized from CDCNF had good re-usability without sacrificing its photocatalytic effect. The synthesized CDCNF composite showed superior possibility for applying cellulose nanofiber to sustainable metal-free photocatalyst.

scholarly journals Synergetic Effect of Carbon Dot at Cellulose Nanofiber for Sustainable Metal-free Photocatalyst

2021 ◽  
Author(s):  
Jungbin Ahn ◽  
Hyungsup Kim ◽  
Sewon pak
Keyword(s):  
Photocatalytic Performance ◽  
Synergetic Effect ◽  
Cellulose Nanofiber ◽  
Electron Recombination ◽  
Electron Hole ◽  
Carbon Dot ◽  
Metal Free ◽  
Photocatalytic Effect ◽  
Recombination Pathway

Abstract Metal-free photocatalyst was synthesized by attaching carbon dot (CD) to cellulose nanofiber (CNF) via simple in-situ synthesis. The graphitic core and functional groups of CD on CNF was controlled along the precursor concentration, while the fibrous structure of CNF was intact. The optical property of the samples was profoundly analyzed focusing on the electron recombination pathway. It reveals that the excited electrons in the CD transferred to the CNF and delayed the radiative recombination. The electron-hole pairs were efficiently separated in the composite where abundant amide group and sulfide bonding existed. The CD on the CNF surface improved the morphological stability of CNF under UV irradiation as well. As a result, the composite showed superior photocatalytic performance to degrade 98% of MB molecules within 25 min. The aerogel synthesized from CDCNF had good re-usability without sacrificing its photocatalytic effect. The synthesized CDCNF composite showed superior possibility for applying cellulose nanofiber to sustainable metal-free photocatalyst.

scholarly journals Synthesis and characterization of black TiO2/graphene composites with enhanced photocatalysis

2020 ◽  
Author(s):  
Zhaoqing Li ◽  
Zhufeng Liu ◽  
Xiao Yang ◽  
Peng Chen ◽  
Lei Yang ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Performance ◽  
Sol Gel ◽  
Photogenerated Electron ◽  
Catalytic Performance ◽  
Attractive Potential ◽  
Electron Hole ◽  
Hole Recombination

Abstract According to the composite design, a series of black TiO2/graphene composites were synthesized to improve its photocatalytic activity. TiO2 is generated in situ on the surface of graphene by a facile sol-gel method. The combination of graphene and TiO2 was beneficial for eliminating the opportunity of photogenerated electron-hole recombination due to the excellent conductivity of graphene. In the subsequent hydrogenation process, the self-doping Ti3+ was introduced accompanied by the crystallization of amorphous TiO2. The narrowed bandgap caused by self-doping Ti3+ enhanced the visible light absorption and make the composites appear black. Both of them improved the photocatalytic performance of the synthesized black TiO2/graphene composites. The band structure of the composite was analyzed by valence band XPS, revealing the reason for the high visible light catalytic performance of the composite. The results proved that the black TiO2/graphene composites synthesized show attractive potential for applications in environmental and energy issues.

In situ photo deposition fabrication of NiCo/g-C3N4 photocatalyst for efficient catalytic hydrogen generation

2021 ◽  
Author(s):  
Jinghua Li ◽  
Bing Luo ◽  
Xuewen Zheng ◽  
Dengwei Jing ◽  
Lijing Ma
Keyword(s):  
Visible Light ◽  
Noble Metal ◽  
Visible Light Irradiation ◽  
Photocatalytic Performance ◽  
Hydrogen Generation ◽  
Light Irradiation ◽  
Metal Free ◽  
Catalytic Hydrogen

In this work, we have prepared noble metal free NiCo/g-C3N4 photocatalysts by situ photoreduction method. The Ni23Co1/g-C3N4 photocatalyst showed excellent photocatalytic performance under visible light irradiation with a high H2...

In situ bubble template promoted facile preparation of porous g-C3N4 with excellent visible-light photocatalytic performance

RSC Advances ◽  
2015 ◽  
Vol 5 (78) ◽  
pp. 63264-63270 ◽  
Author(s):  
Lei Shi ◽  
Lin Liang ◽  
Fangxiao Wang ◽  
Mengshuai Liu ◽  
Tao Liang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Recombination Rate ◽  
Photocatalytic Performance ◽  
Electron Hole ◽  
Facile Preparation ◽  
Bubble Template ◽  
Splitting Water ◽  
Visible Light Photocatalytic

pg-C3N4 prepared through in situ bubble template showed large surface area and low recombination rate of photoinduced electron–hole pairs, leading to enhanced visible-light photocatalytic activity for degrading pollutants and splitting water to H2.

scholarly journals A metal-free 3C-SiC/g-C3N4 composite with enhanced visible light photocatalytic activity

RSC Advances ◽  
2017 ◽  
Vol 7 (63) ◽  
pp. 40028-40033 ◽  
Author(s):  
Hao Xu ◽  
Zhixing Gan ◽  
Weiping Zhou ◽  
Zuoming Ding ◽  
Xiaowei Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Light Absorption ◽  
Carbon Nitride ◽  
Photocatalytic Performance ◽  
Photogenerated Electron ◽  
Electron Hole ◽  
Visible Light Absorption ◽  
Metal Free ◽  
Visible Light Photocatalytic

Insufficient visible light absorption and fast recombination of the photogenerated electron–hole pairs have seriously hampered the photocatalytic performance of graphitic carbon nitride (g-C3N4) up to now.

scholarly journals Metal-free C 60 /CNTs/g-C 3 N 4 ternary heterostructures: synthesis and enhanced visible-light-driven photocatalytic performance

2018 ◽  
Vol 5 (5) ◽  
pp. 172290 ◽  
Author(s):  
Xue Lin ◽  
Rui Zhao ◽  
Yang Xi ◽  
Xiangyu Li ◽  
Junyou Shi ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Performance ◽  
Carbon Materials ◽  
Organic Pollutant ◽  
Phase Method ◽  
Electron Hole ◽  
Metal Free ◽  
Visible Light Driven ◽  
Temperature Solution ◽  
Solution Phase Method

A metal-free C 60 /CNTs/g-C 3 N 4 nanoheterostructure with excellent visible-light photocatalysis for rhodamine B (Rh B) degradation has been reported. Via a convenient low-temperature solution-phase method, g-C 3 N 4 nanosheets can serve as substrate for dispersion of C 60 /CNTs. The loading of C 60 /CNTs onto g-C 3 N 4 nanosheets surfaces significantly enhanced visible-light-driven photocatalytic activity of g-C 3 N 4 catalyst, for oxidation of organic pollutant (Rh B, 100%). Excellent photocatalytic properties of C 60 /CNTs/g-C 3 N 4 can be predominantly attributed to the intimate interfacial contact among constructing compounds, increased specific surface area and enhanced light adsorption efficiency resulted from C 60 /CNTs carbon materials. Particularly, the synergistic heterostructure interaction remarkably hinders the electron–hole pairs recombination, giving rise to significantly enhanced photocatalytic performance of C 60 /CNTs/g-C 3 N 4 in comparison with other counterparts.

scholarly journals Ternary Composite of Co-Doped CdSe@electrospun Carbon Nanofibers: A Novel Reusable Visible Light-Driven Photocatalyst with Enhanced Performance

Catalysts ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 348 ◽  
Author(s):  
Gopal Panthi ◽  
Oh Hoon Kwon ◽  
Yun-Su Kuk ◽  
Kapil Raj Gyawali ◽  
Yong Wan Park ◽  
...  
Keyword(s):  
Carbon Nanofibers ◽  
Photocatalytic Performance ◽  
Electrospun Nanofibers ◽  
Electron Hole ◽  
Ternary Composite ◽  
Photogenerated Electrons ◽  
Visible Light Driven ◽  
Photocatalytic Applications ◽  
Hole Recombination

In this work, flexible ternary composites of cobalt-doped cadmium selenide/electrospun carbon nanofibers (Co-CdSe@ECNFs) for photocatalytic applications were fabricated successfully via electrospinning, followed by carbonization. For the fabrication of the proposed photocatalysts, Co-CdSe nanoparticles were grown in situ on the surface of ECNFs during the carbonization of precursor electrospun nanofibers obtained by dispersing Se powder in the electrospinning solution of polyacrylonitrile/N,N-Dimethylformamide (PAN/DMF) containing Cd2+ and Co2+. The photocatalytic performance of synthesized samples is investigated in the photodegradation of methylene blue (MB) and rhodamine B (RhB) dyes. Experimental results revealed the superior photocatalytic efficiency of Co-CdSe@ECNFs over undoped samples (CdSe@ECNFs) due to the doping effect of cobalt, which is able to capture the photogenerated electrons to prevent electron–hole recombination, thereby improving photocatalytic performance. Moreover, ECNFs could play an important role in enhancing electron transfer and optical absorption of the photocatalyst. This type of fabrication strategy may be a new avenue for the synthesis of other ECNF-based ternary composites.

scholarly journals Prediction of a Stable Organic Metal-Free Porous Material as a Catalyst for Water-Splitting

Catalysts ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 836
Author(s):  
Hengshuai Li ◽  
Haiquan Hu ◽  
Chenglin Bai ◽  
Chunjiang Bao ◽  
Cailong Liu ◽  
...  
Keyword(s):  
Photocatalytic Performance ◽  
Tensile Force ◽  
Practical Significance ◽  
Organic Metal ◽  
Electron Hole ◽  
Metal Free ◽  
Photocatalytic Application ◽  
The Stability ◽  
Dynamics Simulations ◽  
Hole Recombination

It is of practical significance to find organic metal-free catalyst materials. We propose a new graphene-like carbon nitride structure, which was able to meet these requirements well. Its primitive cell consists of eight carbon atoms and six nitrogen atoms. Hence, we called this structure g–C8N6. The stability of the structure was verified by phonon spectroscopy and molecular dynamics simulations. Then its electronic structure was calculated, and its band edge position was compared with the redox potential of water. We analyzed its optical properties and electron–hole recombination rate. After the above analysis, it is predicted that it is a suitable photocatalyst material. To improve its photocatalytic performance, two methods were proposed: applied tensile force and multilayer stacking. Our research is instructive for the photocatalytic application of this kind of materials.

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