Effective removal of colourless pollutants and organic dyes by Ag@AgCl nanoparticle-modified CaSn(OH)6 composite under visible light irradiation

2017 ◽  
Vol 41 (13) ◽  
pp. 5334-5346 ◽  
Author(s):  
Chao Liang ◽  
Cheng-Gang Niu ◽  
Xiao-Ju Wen ◽  
Shi-Feng Yang ◽  
Mao-Cai Shen ◽  
...  
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Absorption ◽  
Organic Dyes ◽  
Light Irradiation ◽  
Electron Hole ◽  
Visible Light Absorption ◽  
Effective Removal ◽  
Agcl Nanoparticles

The Ag@AgCl nanoparticles could broaden visible-light absorption of pure CSH and depress the recombination of photoinduced electron–hole pairs.

A novel ternary MQDs/NCDs/TiO2 nanocomposite that collaborates with activated persulfate for efficient RhB degradation under visible light irradiation

2021 ◽  
Author(s):  
Qian Zhang ◽  
Han Zhao ◽  
Yuming Dong ◽  
Xiangmiao Zhu ◽  
Xiang Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Absorption ◽  
Absorption Capacity ◽  
Hole Transport ◽  
Light Irradiation ◽  
Pollutant Degradation ◽  
Electron Hole ◽  
Activated Persulfate

TiO2 nanosheets modified with dual MQDs/NCD quantum dots not only promote light absorption capacity and electron–hole transport but also collaborate well with activated persulfate for pollutant degradation.

A simple method to synthesise Ag-doped TiO2 photocatalysts with different Ag0:Ag2O atomic ratios for enhancing visible-light photocatalytic activity

2017 ◽  
Vol 41 (8) ◽  
pp. 475-483 ◽  
Author(s):  
C. Chen ◽  
X. F. Lei ◽  
M. Z. Xue
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Absorption ◽  
Separation Efficiency ◽  
Visible Region ◽  
Light Irradiation ◽  
Electron Hole ◽  
X Ray

Pure anatase TiO2 photocatalysts with different Ag contents were prepared via a simple sol-gel method. The as-prepared anatase Ag-doped TiO2 photocatalysts were characterised by X-ray diffraction, transmission electron microscopy, UV-Vis diffuse reflectance spectra, photoluminescence spectroscopy, X-ray photoelectron spectroscopy, thermal gravity and differential thermal analysis, scanning electron microscopy and N2 adsorption–desorption measurements (BET). Compared with pure TiO2, Ag-doped anatase TiO2 photocatalysts exhibited not only increases in light absorption in the visible region, the separation efficiency of electron–hole pairs and surface area, but also inhibition of the titania phase transition from anatase to rutile. Photoreduction results showed that Ag-doped anatase TiO2 photocatalysts have greatly improved photocatalytic activity, compared with pure TiO2, and the reduction of Cr(VI) under visible light irradiation was much higher than that of pure TiO2. The optimum Ag content was 1.0 mol%, which led to the complete reduction of Cr(VI) under visible light irradiation (λ > 420 nm) for 4 h. The enhanced photocatalytic activity was attributed to the synergic effect of the pure anatase structure, and the increased light absorption in the visible region, separation efficiency of electron–hole pairs and atomic ratio of Ag0:Ag2O.

scholarly journals A facile synthesis of MgFe2O4/ZnS heterojunction with effectively enhanced visible light photocatalytic activity for degradation of methylene blue and crystal violet dyes

2021 ◽  
Author(s):  
Rajkumar S ◽  
Seetharaman S ◽  
Vijayan V ◽  
Sivaraj M ◽  
Chandran M ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Crystal Violet ◽  
Visible Light Irradiation ◽  
Organic Dyes ◽  
Light Irradiation ◽  
Experimental Result ◽  
Electron Hole ◽  
Effective Electron ◽  
Uv Visible

Abstract A novel n-MgFe2O4–n-ZnS heterojunction catalyst was employed via two step approach for photodegradation of organic dyes such as methylene blue (MB) and crystal violet (CV) dyes under visible light irradiation. The synthesized MgFe2O4/ZnS NCs were characterized using PXRD, FTIR, UV-visible spectroscopy, PL and FESEM analysis which reveals the formation of flake like structure with size as to be ~50 nm. The photocatalytic experimental result demonstrates that the MgFe2O4/ZnS nanocomposites (NCs) improve photodegradation performance with 98.0% and 91% decomposition of MB and CV dyes within 120 min illumination during simulated visible light irradiation. From the result, MgFe2O4/ZnS NCs has higher photocatalytic performance than that of MgFe2O4, and ZnS due to efficient separation of the photo-induced electron-hole pairs and effective electron–hole generation transfer by the formation of n-MgFe2O4–n-ZnS heterojunction. Hence, photodegradation performance implies that the synthesized MgFe2O4/ZnS NCs can be effectively utilized in waste water purification systems.

Enhanced photo-assisted ethanol electro-oxidation activity by using broadband visible light absorption of a graphitic C3N4/BiOI carrier

2019 ◽  
Vol 3 (2) ◽  
pp. 439-449 ◽  
Author(s):  
Jiayue Hu ◽  
Chunyang Zhai ◽  
Haifeng Gao ◽  
Lixi Zeng ◽  
Yukou Du ◽  
...  
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Absorption ◽  
Light Harvesting ◽  
Light Irradiation ◽  
Oxidation Activity ◽  
Visible Light Absorption ◽  
Electro Oxidation

A 2D/2D g-C3N4/BiOI heterojunction was used as a broad light harvesting support for the enhancement (16.9 times) of ethanol electro-oxidation under visible light irradiation.

Na0.5Ce0.5MoO4 as a new light absorption material to efficiently degrade RhB under visible light irradiation

RSC Advances ◽  
2016 ◽  
Vol 6 (58) ◽  
pp. 52646-52655 ◽  
Author(s):  
Liming Yang ◽  
Fei Teng ◽  
Juan Xu ◽  
Yang Yang ◽  
Yandong Kan ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Absorption ◽  
High Conductivity ◽  
Light Irradiation ◽  
Visible Light Absorption

Na0.5Ce0.5MoO4, with a high visible light absorption and a high conductivity, remarkably improves photocatalytic activity of Na0.5Ce0.5MoO4/MoO3 heterojunctions under visible light irradiation.

scholarly journals Synthesis, Analysis, and Testing of BiOBr-Bi2WO6Photocatalytic Heterojunction Semiconductors

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Xiangchao Meng ◽  
Zisheng Zhang
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Degradation Process ◽  
Light Irradiation ◽  
Enhancement Effect ◽  
Electron Hole ◽  
Experimental Conditions ◽  
Synthesis Conditions ◽  
Optimum Synthesis ◽  
Photocatalytic Activities

In photocatalysis, the recombination of electron-hole pairs is generally regarded as one of its most serious drawbacks. The synthesis of various composites with heterojunction structures has increasingly shed light on preventing this recombination. In this work, a BiOBr-Bi2WO6photocatalytic heterojunction semiconductor was synthesized by the facile hydrothermal method and applied in the photocatalytic degradation process. It was determined that both reaction time and temperature significantly affected the crystal structure and morphologies of the photocatalysts. BiOBr (50 at%)-Bi2WO6composites were prepared under optimum synthesis conditions (120°C for 6 h) and by theoretically analyzing the DRS results, it was determined that they possessed the suitable band gap (2.61 eV) to be stimulated by visible-light irradiation. The photocatalytic activities of the as-prepared photocatalysts were evaluated by the degradation ofRhodamine B (RhB)under visible-light irradiation. The experimental conditions, including initial concentration, pH, and catalyst dosage, were explored and the photocatalysts in this system were proven stable enough to be reused for several runs. Moreover, the interpreted mechanism of the heterojunction enhancement effect proved that the synthesis of a heterojunction structure provided an effective method to decrease the recombination rate of the electron-hole pairs, thereby improving the photocatalytic activity.

N-doped TiO2/s-PS aerogels for photocatalytic degradation of organic dyes in wastewater under visible light irradiation

2014 ◽  
Vol 89 (8) ◽  
pp. 1175-1181 ◽  
Author(s):  
Vincenzo Vaiano ◽  
Olga Sacco ◽  
Diana Sannino ◽  
Paolo Ciambelli ◽  
Simona Longo ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Visible Light Irradiation ◽  
Organic Dyes ◽  
Light Irradiation ◽  
Doped Tio2

Ag2O/ZnO Heterostructures with Enhanced Photocatalytic Activity

2021 ◽  
Vol 1035 ◽  
pp. 1043-1049
Author(s):  
Di Xiang ◽  
Chang Long Shao
Keyword(s):  
Electron Microscopy ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Environmental Remediation ◽  
Organic Dyes ◽  
Light Irradiation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
P Type

A simple route has been developed for the synthesis of Ag2O/ZnO heterostructures and the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS) and photoluminescence (PL) spectroscopy analysis. Considering the porous structure of Ag2O/ZnO, the photocatalytic degradation for the organic dyes, such as eosin red (ER), methyl orange (MO), methylene blue (MB) and rhodamine B (RhB), under visible light irradiation was investigated in detail. Noticeably, Ag2O/ZnO just took 40 min to degrade 96 % MB. The rate of degradation using the Ag2O/ZnO heterostructures was 2.3 times faster than that of the bare porous ZnO nanospheres under visible light irradiation due to that the recombination of the photogenerated charge was inhibited greatly in the p-type Ag2O and n-type ZnO semiconductor. So the Ag2O/ZnO heterostuctures showed the potential application on environmental remediation.

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