scholarly journals Preparation ofBiFeO3-Graphene Nanocomposites and Their Enhanced Photocatalytic Activities

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
J. F. Dai ◽  
T. Xian ◽  
L. J. Di ◽  
H. Yang
Keyword(s):  
Photocatalytic Performance ◽  
Ethanol Solution ◽  
Oh Radicals ◽  
Simulated Sunlight ◽  
Sunlight Irradiation ◽  
Graphene Nanocomposites ◽  
Photogenerated Electrons ◽  
Photocatalytic Activities ◽  
Enhanced Yield ◽  
Efficient Transfer

BiFeO3nanoparticles were prepared via a polyacrylamide gel route. BiFeO3-graphene nanocomposites were fabricated by mixing BiFeO3nanoparticles and graphene into absolute ethanol solution followed by thermal drying. The TEM observation demonstrates that the BiFeO3nanoparticles are well anchored onto graphene sheets. The photocatalytic activities of the as-prepared samples were evaluated by the degradation of methyl orange (MO) under simulated sunlight irradiation. Compared to bare BiFeO3nanoparticles, BiFeO3-graphene nanocomposites exhibit enhanced photocatalytic activity. The outstanding photocatalytic performance is mainly ascribed to the efficient transfer of photogenerated electrons from BiFeO3to graphene, thus leading to an increased availability of h+for the photocatalytic reaction. In addition, hydroxyl (·OH) radicals were detected by the photoluminescence technique using terephthalic acid as a probe molecule and are found to be produced on the irradiated BiFeO3and BiFeO3-graphene nanocomposites; in particular, an enhanced yield is observed for the latter.

Synthesis of CdS/Nd2S3 nanocomposite with enhanced photocatalytic performance under simulated sunlight irradiation

2020 ◽  
Vol 189 ◽  
pp. 349-356
Author(s):  
Haihua Yang ◽  
Chaohua Dai ◽  
Lingjie Jiang ◽  
Li Zhang ◽  
Jianhui Yan
Keyword(s):  
Photocatalytic Performance ◽  
Simulated Sunlight ◽  
Sunlight Irradiation

Study on the effect of water contents on the formation of nanostructured porphyrins via self-assembly and their application for the degradation of organic dyes

2021 ◽  
Vol 10 (3) ◽  
pp. xx-xx
Author(s):  
Anh Nguyen Tuan ◽  
Khiem Le Dinh ◽  
Quynh Tran Nhu ◽  
Tuan Truong Ngoc ◽  
Ha Ninh Duc ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Self Assembly ◽  
Photocatalytic Performance ◽  
Organic Dyes ◽  
Simulated Sunlight ◽  
Sunlight Irradiation ◽  
Water Fraction ◽  
Vis Spectroscopy ◽  
Water Contents ◽  
Scanning Electron

In this work, the THF/H2O mixture was employed to synthesize the nanostrucuted 5,10,15,20-tetra(3,4,5-trimethoxyphenyl) porphyrin (TTOP) via solvophobic self-assembly. The resultant porphyrin nanomaterial was characterized using photoluminescence (PL), UV-vis spectroscopy, and scanning electron microscopy (SEM). The prepared self-assembled porphyrin was in structures of rod-like, cubic-lik, and particles forms. These porphyrin crystals showed high photocatalytic performance for the degradation of RhB under simulated sunlight irradiation, especially with the porphyrin crystal formed with the water fraction of 80 and 90%.

ZIF-8 derived ZnO/Zn6Al2O9/Al2O3 nanocomposite with excellent photocatalytic performance under simulated sunlight irradiation

2019 ◽  
Vol 43 (7) ◽  
pp. 2990-2999 ◽  
Author(s):  
Li Zhang ◽  
Qingman Liang ◽  
Peng Yang ◽  
Yang Huang ◽  
Younian Liu ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Photocatalytic Performance ◽  
Simulated Sunlight ◽  
High Concentration ◽  
Sunlight Irradiation ◽  
Degradation Activity

The ZIF-8 derived ZnO/Zn6Al2O9/Al2O3 nanocomposite exhibits an unprecedented photocatalytic degradation activity toward MO of high concentration.

Facile Synthesis of Ag/ZnO Hollow Microspheres with Enhanced Photocatalytic Performance under Simulated Sunlight Irradiation

NANO ◽  
2019 ◽  
Vol 14 (03) ◽  
pp. 1950036 ◽  
Author(s):  
Lifeng Cui ◽  
Qiulin Zhang ◽  
Chaochuang Yin ◽  
Shifei Kang ◽  
Zhigang Ge ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Photocatalytic Performance ◽  
Solvothermal Method ◽  
Organic Dyes ◽  
Dye Degradation ◽  
Hollow Microspheres ◽  
Simulated Sunlight ◽  
Facile Synthesis ◽  
Sunlight Irradiation ◽  
Spr Effect

Water pollution caused by intensive use of organic dyes has become an increasingly serious problem recently. Green and efficient processes are desperately needed to remove persistent organic pollutants from waste waters. Herein, Ag nanoparticles loaded ZnO hollow microspheres were synthesized through a simple solvothermal method and used as a photocatalyst for dye degradation. The calculated band gap of Ag/ZnO — 5% (2.97[Formula: see text]eV) is much narrower than that of pure ZnO (3.37[Formula: see text]eV). The obtained Ag/ZnO samples show a remarkable photocatalytic activity in photodegradation of Rhodamine B (RhB) under simulated sunlight irradiation. The degradation efficiency of RhB for Ag/ZnO — 5% is 98.8% after 100[Formula: see text]min irradiation while only 52.8% degradation rate is obtained over pure ZnO. The enhancement is attributed to the exposed active ZnO (001) plane and the surface plasmon resonance (SPR) effect of Ag nanoparticles that promote the separation of photogeneated electrons and holes.

Microwave and Conventional Hydrothermal Synthesis of TiO2 Nanoparticles and their Photocatalytic Activities

2011 ◽  
Vol 391-392 ◽  
pp. 988-992 ◽  
Author(s):  
Lian Jie Zhu ◽  
Hui Miao ◽  
Kun Liu ◽  
You Guang Sun ◽  
Mo Qiu ◽  
...  
Keyword(s):  
Diffuse Reflectance ◽  
Synthetic Method ◽  
Particle Sizes ◽  
Simulated Sunlight ◽  
Sunlight Irradiation ◽  
Oh Groups ◽  
Microwave Assisted ◽  
Photocatalytic Activities ◽  
Ft Ir ◽  
Microwave Assisted Method

Series of anatase TiO2 nanoparticles with different particle sizes were prepared by a fast microwave-assisted method and conventional hydrothermal method, using ionic liquids, 1-ethyl-2,3-dimethylimidazole bromide and N-butylpyridinium hexafluorophosphate, and polyethylene glycol as templates, respectively. The crystal structures and morphologies of the nanoparticles were characterized by XRD and SEM. Their light harvesting capabilities and band gap energies were investigated by UV-Vis diffuse reflectance absorption spectra. The surface –OH groups were detected by FT-IR and the photocatalytic activities were estimated by photodegradations of rhodamine B aqueous solutions under simulated sunlight irradiation. The results show that the type of the template and synthetic method affect the particle sizes of the products, and the photocatalytic activities of the TiO2 nanoparticles are close related with their particle sizes.

Synthesis of ZnS/CuS nanospheres loaded on reduced graphene oxide as high-performance photocatalysts under simulated sunlight irradiation

2017 ◽  
Vol 41 (13) ◽  
pp. 5732-5744 ◽  
Author(s):  
Liu Yang ◽  
Xin Guan ◽  
Guang-Sheng Wang ◽  
Xiao-Hui Guan ◽  
Bo Jia
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
High Performance ◽  
Photocatalytic Performance ◽  
Simulated Sunlight ◽  
Sunlight Irradiation ◽  
Reduced Graphene

Schematic descriptions for the formation of ZnS/CuS–rGO nanocomposites and their excellent photocatalytic performance.

scholarly journals Ag2CO3 Decorating BiOCOOH Microspheres with Enhanced Full-Spectrum Photocatalytic Activity for the Degradation of Toxic Pollutants

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 914 ◽  
Author(s):  
Shijie Li ◽  
Liuye Mo ◽  
Yanping Liu ◽  
Huiqiu Zhang ◽  
Yaming Ge ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Environmental Remediation ◽  
Photocatalytic Performance ◽  
Type I ◽  
Simulated Sunlight ◽  
Practical Application ◽  
Pollutant Degradation ◽  
Full Spectrum ◽  
Sunlight Irradiation ◽  
Toxic Pollutants

The development of excellent full-spectrum photocatalysts is of vital significance to its practical application in environmental remediation. Herein, flower-like Ag2CO3/BiOCOOH type I heterostructures were prepared via a facile method and exhibited powerful photocatalytic activity by removing various toxic pollutants (rhodamine B, methyl blue, and tetracycline hydrochloride) under simulated sunlight irradiation. The boosted photocatalytic performance is attributed to the expanded range of the absorption spectrum and alleviated separation rate of the photo-induced electrons and holes. The photoluminescence spectra and trapping experiment were applied to clarify the photocatalytic reaction mechanism of Ag2CO3/BiOCOOH. The holes and •O2− were detected as the dominant reactive species involved in pollutant degradation. This work provides a novel full-spectrum-driven photocatalyst of Ag2CO3/BiOCOOH, which could effectively degrade toxic pollutants under simulated sunlight.

The synergistic reaction of Ag deposition and Ce dopant to modify TiO2-based nanomaterials for efficient light photocatalysis

2019 ◽  
Vol 12 (01) ◽  
pp. 1850095 ◽  
Author(s):  
Chenghe Hua ◽  
Xiaoli Dong ◽  
Xiuying Wang ◽  
Xiufang Zhang ◽  
Hongchao Ma
Keyword(s):  
Light Absorption ◽  
Photocatalytic Performance ◽  
Photogenerated Electron ◽  
Simulated Sunlight ◽  
Electron Hole ◽  
Sunlight Irradiation ◽  
Hydrolysis Method ◽  
Optical And Electronic Properties ◽  
Ion Doping ◽  
Ag Deposition

The Ce/TiO2 (Ce/Ti) and Ag/Ce/TiO2 (Ag/Ce/Ti) nanomaterials were successfully synthesized by hydrolysis method. The products were characterized by a variety of characteristic techniques to investigate their phases, morphologies, structures, optical and electronic properties and photocatalytic performance. The DRS, PL and PEC indicated that the introduction of Ce and Ag resulted in a stronger light absorption and an effective charge separation. The photocatalytic performance of both Ce/Ti and Ag/Ce/Ti were evaluated for degrading reactive blue K-NR under simulated sunlight irradiation. The results demonstrated that Ce[Formula: see text] ion doping and Ag deposition synergetic interaction effectively enhance the TiO2 photocatalytic activity ascribed to the improved photogenerated electron–hole pairs separation, enhanced light absorption and large surface area. Considering their good performance, the Ag/Ce/Ti photocatalyst can be applied in organic pollutants treatment in water and environmental purification.

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