Visible light driven photocatalytic activity of Fe-doped ZnO nanocrystals

2017 ◽  
Vol 10 (02) ◽  
pp. 1750002 ◽  
Author(s):  
Bao-Gai Zhai ◽  
Long Yang ◽  
Qing-Lan Ma ◽  
Yuan Ming Huang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Density Functional ◽  
Diffuse Reflectance Spectroscopy ◽  
Deep Trap ◽  
Precipitation Method ◽  
Trap Level ◽  
Zno Nanocrystals ◽  
Visible Light Driven ◽  
Doped Zno

Fe-doped ZnO nanocrystals at the level of 8[Formula: see text]mol% were synthesized via the co-precipitation method and then characterized by transmission electron microscopy, X-ray diffraction, diffuse reflectance spectroscopy and UV–Vis absorption spectroscopy. Strong absorptions with its peak at around 500[Formula: see text]nm were recorded in the range of 400–600[Formula: see text]nm for Fe-doped ZnO nanocrystals. Visible-light driven photocatalytic activity of Fe-doped ZnO nanocrystals was demonstrated via the photocatalytic degradation of methyl orange dye. Density functional calculations show that Fe dopant can generate a deep trap level at Ev [Formula: see text] 1.01[Formula: see text]eV in the bandgap of ZnO, which is believed to be responsible for the visible light responsive photocatalytic activity of Fe-doped ZnO.

scholarly journals Synthesis of BiSI/Ag2CO3 Composite Material for Photocatalytic Degradation of Rhodamine B under Visible Light

2021 ◽  
Author(s):  
Rui Zhang ◽  
ziyin chen ◽  
Chen Zhao ◽  
Kunlin Zeng ◽  
Lu Cai ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Rhodamine B ◽  
Photocatalytic Performance ◽  
Electrochemical Impedance ◽  
Diffuse Reflectance Spectroscopy ◽  
Mass Ratio ◽  
X Ray ◽  
Visible Light Driven

Abstract A novel binary BiSI/Ag2CO3 photocatalyst with excellent visible light-driven photocatalytic performance was prepared. The products were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS) and electrochemical impedance spectroscopy (EIS). The photocatalytic activity of the samples were evaluated by photocatalytic degradation of rhodamine B(RhB) under the irradiation of visible light. The results showed that the BiSI improves the photocatalytic activity of BiSI/Ag2CO3. Moreover, when the mass ratio of BiSI in BiSI/Ag2CO3 composites was 40%, the as-prepared BiSI/Ag2CO3 composite exhibited the best photocatalytic activity for degrading RhB. Finally, the possible mechanism for photodegradation over the BiSI/Ag2CO3 composites is also proposed.

scholarly journals Synthesis of C-N-S-Tridoped TiO2 from Vietnam Ilmenite Ore and Its Visible Light-Driven-Photocatalytic Activity for Tetracyline Degradation

2020 ◽  
Vol 2020 ◽  
pp. 1-14 ◽  
Author(s):  
Nguyen Thi Lan ◽  
Vo Hoang Anh ◽  
Hoang Duc An ◽  
Nguyen Phi Hung ◽  
Dao Ngoc Nhiem ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Photoelectron Spectroscopy ◽  
Diffuse Reflectance Spectroscopy ◽  
Nitrogen Adsorption ◽  
Photocatalytic Decomposition ◽  
Raman Scattering Spectroscopy ◽  
X Ray ◽  
Visible Light Driven

In this study, C-N-S-tridoped TiO2 composite was fabricated from TiO2 prepared from ilmenite ore and thiourea by means of hydrothermal method. The obtained material was characterized by X-ray diffraction, Raman scattering spectroscopy, UV-Vis diffuse reflectance spectroscopy, nitrogen adsorption-desorption isotherms, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). It was found that C-N-S-tridoped TiO2 material has a large specific surface area, showing good photocatalytic activity on the degradation of antibiotic tetracycline in visible light region. The study on the mechanism of tetracycline photodegradation using the liquid chromatography with mass spectrometry was performed. It was found that tetracycline has been degraded over C-N-S-tridoped TiO2 catalyst into many different intermediates which can eventually be converted into CO2 and H2O. The kinetics of photocatalytic decomposition of tetracycline were investigated. In addition, the obtained material could catalyze well the degradation of other antibiotics (ciprofloxacin and chloramphenicol) and dyes (rhodamine-B, methylene blue, and organe red). The catalyst was stable after five recycles with slight loss of catalytic activity, which indicates great potential for practical application of C-N-S-tridoped TiO2 catalyst in treatment of wastewater containing tetracycline in particular or antibiotics in general.

scholarly journals Rendering Visible-Light Photocatalytic Activity to Undoped ZnO via Intrinsic Defects Engineering

Catalysts ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1163
Author(s):  
Lan-li Chen ◽  
Bao-gai Zhai ◽  
Yuan Ming Huang
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Density Functional Calculations ◽  
Density Functional ◽  
Oxygen Vacancies ◽  
Intrinsic Defect ◽  
Visible Light Photocatalytic Activity ◽  
Zno Nanocrystals ◽  
Visible Light Photocatalytic

It is significant to render visible-light photocatalytic activity to undoped ZnO nanostructures via intrinsic defect engineering. In this work, undoped ZnO nanocrystals were derived via co-precipitation synthesis. The resulting ZnO nanocrystals were characterized by means of X-ray diffraction, scanning electron microscopy, photoluminescence spectroscopy, and ultraviolet-visible absorption spectroscopy, respectively. The visible-light photocatalytic activity of the products were characterized by monitoring the decomposition of methyl orange in water under visible-light illumination of a 300 W halogen lamp. It is found that undoped ZnO nanocrystals exhibit visible-light photocatalytic activity with their first-order rate constant up to 4.6 × 10−3 min−1. Density functional calculations show that oxygen vacancies create deep energy levels at EV + 0.76 eV in the bandgap of ZnO. In conjunction with the density functional calculations, the photocatalytic degradation of methyl orange under visible-light irradiation provides direct evidence that oxygen vacancies in ZnO nanocrystals yield the visible-light photocatalytic activity. Our results demonstrate that visible-light photocatalytic activity can be endowed to undoped ZnO nanocrystals by manipulating the intrinsic defects in ZnO. Intrinsic defect-modulated ZnO photocatalysts thus represent a powerful configuration for further development toward visible-light responsive photocatalysis.

Synthesis of Nanocrystalline LaFeO3 by Precipitation and its Visible-Light Photocatalytic Activity

2011 ◽  
Vol 694 ◽  
pp. 150-154 ◽  
Author(s):  
Pei Song Tang ◽  
Meng Bi Fu ◽  
Hai Feng Chen ◽  
Feng Cao
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Diffuse Reflectance Spectroscopy ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Visible Light Photocatalytic Activity ◽  
Degussa P25 ◽  
Uv Visible ◽  
532 Nm ◽  
Visible Light Photocatalytic

The LaFeO3 nanoparticle was synthesized using Fe(NO3)3 and La(NO3)3 as starting materials by homogeneous precipitation method. The as-prepared LaFeO3 product was characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-visible diffuse reflectance spectroscopy (DRS). XRD and SEM demonstrate the successful synthesis of single phase perovskite LaFeO3 and with 60-80 nm particle size. It was found that the as-prepared LaFeO3 shows strong visible-light absorption with absorption onset of 532 nm, indicating a narrow optical band gap of 2.33 eV. Furthermore, the as-prepared LaFeO3 shows high visible-light photocatalytic activity for decomposition of methylene blue in comparison with the commercial Degussa P25.

Physical Properties and Photocatalytic Activity of Fe- and Co-Doped ZnO Nanoparticles Synthesized via Surfactant Modified Co-Precipitation

2015 ◽  
Vol 1123 ◽  
pp. 241-246 ◽  
Author(s):  
Annisa Noorhidayati ◽  
Siti Adriani ◽  
Rosari Saleh
Keyword(s):  
Photocatalytic Activity ◽  
Diffuse Reflectance Spectroscopy ◽  
Uv Light ◽  
Sodium Dodecyl ◽  
Precipitation Method ◽  
Resonance Spectroscopy ◽  
Dopant Atom ◽  
Doped Zno ◽  
Co Precipitation ◽  
Co Doped

Fe- and Co-doped ZnO with various doping concentrations have been synthesized by co-precipitation method in the presence of sodium dodecyl sulfate as anionic surfactant. The obtained sample powders were characterized by X-ray diffraction, Fourier transform infrared absorption, UV-visible diffuse reflectance spectroscopy, electron spin resonance spectroscopy and Brunauer-Emmet-Teller (BET) method. The photocatalytic activity was evaluated by observing the decolorization of methylene blue under UV light irradiation. The results revealed that the addition of a dopant atom significantly enhanced the photocatalytic activity.

Well-Supported Ag3VO4–AgBr Nanostructures for Visible Light-Driven Treatment of Wastewaters

2017 ◽  
Vol 42 (3) ◽  
pp. 251-258 ◽  
Author(s):  
Mohsen Padervand
Keyword(s):  
Visible Light ◽  
Treatment Time ◽  
Diffuse Reflectance Spectroscopy ◽  
Photogenerated Electron ◽  
Nitrogen Adsorption ◽  
Precipitation Method ◽  
Sem Images ◽  
Bet Analysis ◽  
Visible Light Driven ◽  
Average Size

Ag3VO4–AgBr nanoparticles were loaded on fluorapatite (FA) and carboxymethyl cellulose (CMC) supports by an ionic liquid-mediated precipitation method and used as effective visible light-driven photocatalysts for the degradation of Acid Blue 92 (AB92) azo dye as a typical wastewater. The products were characterised by powder X-ray diffraction (XRD), diffuse reflectance spectroscopy, FTIR, scanning electron microscopy (SEM) and nitrogen adsorption–desorption isotherms using Brunauer–Emmett–Teller (BET) analysis. The XRD patterns confirmed the formation of Ag3VO4 and AgBr crystalline phases. Moreover, the SEM images indicated that the photoactive agents were homogeneously dispersed on the surface and the average size of the particles was between 45 and 95 nm. During the treatment time, the photogenerated electron–hole pairs reacted with the species in the solution and produced OH•, HO2• and O2•– species which attacked the organic pollutants and destroyed the crucial bonds. Recycling experiments confirmed that the CMC-based photocatalyst was more active during the first time of using while the FA analogue was determined to be sufficiently active after five cycles of usage.

Visible-Light-Driven Photocatalysis of Gd-Doped ZnO Nanoparticles Prepared by Tartaric Acid Precipitation Method

2019 ◽  
Vol 64 (12) ◽  
pp. 1600-1608
Author(s):  
Surisa Sa-nguanprang ◽  
Anukorn Phuruangrat ◽  
Titipun Thongtem ◽  
Somchai Thongtem
Keyword(s):  
Visible Light ◽  
Tartaric Acid ◽  
Zno Nanoparticles ◽  
Acid Precipitation ◽  
Precipitation Method ◽  
Visible Light Driven ◽  
Doped Zno

Synthesis of an Ag3PO4/AlPO4 composites for enhanced visible light-driven photocatalytic activity

2020 ◽  
Vol 10 (8) ◽  
pp. 1284-1291
Author(s):  
Yanlin Zhang ◽  
Fuzhong Gong ◽  
Yanlin Li ◽  
Sunqi Liao
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Performance ◽  
Precipitation Method ◽  
Molar Ratios ◽  
Homogeneous Precipitation Method ◽  
Degradation Of Dyes ◽  
Vis Spectroscopy ◽  
Bet Method ◽  
Visible Light Driven

Novel non-porous Ag3PO4/AlPO4 composites with a stick shape were synthesized using the homogeneous precipitation method and characterized by XRD, FESEM, XPS, UV-vis spectroscopy and BET method. The photocatalytic performance was evaluated by degradation of MB and MO upon irradiation with visible light. Results indicate that when the molar ratios of Ag3PO4 to AlPO4 are 6:4 or higher, remarkable increases in photocatalytic activity were observed compared with the pure Ag3PO4 powder. The possible mechanism of photocatalytic degradation of dyes by Ag3PO4/AlPO4 composites was proposed.

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