Boosting the Visible-Light Photoactivity of BiOCl/BiVO4/N-GQD Ternary Heterojunctions Based on Internal Z-Scheme Charge Transfer of N-GQDs: Simultaneous Band Gap Narrowing and Carrier Lifetime Prolonging

2017 ◽  
Vol 9 (44) ◽  
pp. 38832-38841 ◽  
Author(s):  
Mingyue Zhu ◽  
Qian Liu ◽  
Wei Chen ◽  
Yuanyuan Yin ◽  
Lan Ge ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Visible Light ◽  
Band Gap ◽  
Carrier Lifetime ◽  
Band Gap Narrowing

Band‐Gap and Charge Transfer Engineering in Red Phosphorus‐Based Composites for Enhanced Visible‐Light‐Driven H 2 Evolution

2020 ◽  
Vol 26 (10) ◽  
pp. 2285-2292 ◽  
Author(s):  
Ying Xuan ◽  
Huiying Quan ◽  
Zhurui Shen ◽  
Chenxi Zhang ◽  
Xiyuan Yang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Visible Light ◽  
Band Gap ◽  
Red Phosphorus ◽  
Visible Light Driven

scholarly journals Glycerol-Mediated Facile Synthesis of Colored Titania Nanoparticles for Visible Light Photodegradation of Phenolic Compounds

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1586 ◽  
Author(s):  
Nawaz ◽  
Kait ◽  
Chia ◽  
Isa ◽  
Huei
Keyword(s):  
Phenolic Compounds ◽  
Visible Light ◽  
Band Gap ◽  
Photocatalytic Performance ◽  
Titania Nanoparticles ◽  
Glycerol Solution ◽  
Subsequent Calcination ◽  
Palm Oil Mill ◽  
Band Gap Narrowing ◽  
Gap States

In this study, we developed a glycerol-mediated safe and facile method to synthesize colored titania nanoparticles (NPs) via solution route. Our method is considerably effective and greener than other options currently available. Colored titania NPs were produced by hydrolyzing TiCl4 precursor in aqueous solution containing different concentrations of glycerol (0.0, 1.163, 3.834, and 5.815 mol/L) and subsequent calcination at 300 °C for 1 h. Our results highlight firstly that glycerol-mediated synthesis is unlikely to affect the anatase crystalline structure of TiO2, and secondly, that it would lead to coloration, band gap narrowing, and a remarkable bathochromic redshift of the optical response of titania. More importantly, the synthesized colored titania have Ti3+ ions, which, at least in terms of our samples, is the major factor responsible for its coloration. These Ti3+ species could induce mid gap states in the band gap, which significantly improve the visible light absorption capability and photocatalytic performance of the colored titania. The photocatalytic experiments showed that the colored TiO2 NPs prepared in 1.163 mol/L aqueous glycerol solution displayed the best photocatalytic performance. Almost 48.17% of phenolic compounds and 62.18% of color were removed from treated palm oil mill effluent (POME) within 180 min of visible light irradiation.

Band gap narrowing of titanium dioxide (TiO2) nanocrystals by electrochemically active biofilms and their visible light activity

Nanoscale ◽  
2013 ◽  
Vol 5 (14) ◽  
pp. 6323 ◽  
Author(s):  
Shafeer Kalathil ◽  
Mohammad Mansoob Khan ◽  
Sajid Ali Ansari ◽  
Jintae Lee ◽  
Moo Hwan Cho
Keyword(s):  
Titanium Dioxide ◽  
Visible Light ◽  
Band Gap ◽  
Tio2 Nanocrystals ◽  
Electrochemically Active ◽  
Light Activity ◽  
Band Gap Narrowing

scholarly journals Large Band Gap Narrowing and Prolonged Carrier Lifetime of (C 4 H 9 NH 3 ) 2 PbI 4 under High Pressure

2019 ◽  
pp. 1900240 ◽  
Author(s):  
Ye Yuan ◽  
Xiao‐Fei Liu ◽  
Xuedan Ma ◽  
Xiaoli Wang ◽  
Xin Li ◽  
...  
Keyword(s):  
High Pressure ◽  
Band Gap ◽  
Carrier Lifetime ◽  
Band Gap Narrowing

scholarly journals Mechanisms of Visible Light Photocatalysis in N-Doped Anatase TiO2with Oxygen Vacancies from GGA+U Calculations

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Hsuan-Chung Wu ◽  
Yu-Siang Lin ◽  
Syuan-Wei Lin
Keyword(s):  
Visible Light ◽  
Band Gap ◽  
Density Functional ◽  
Nitrogen Doping ◽  
Formation Energy ◽  
Oxygen Vacancies ◽  
Energy Charge ◽  
Visible Light Photocatalysis ◽  
Donor States ◽  
Band Gap Narrowing

We have systematically studied the photocatalytic mechanisms of nitrogen doping in anatase TiO2using first-principles calculations based on density functional theory, employing HubbardU(8.47 eV) on-site correction. The impurity formation energy, charge density, and electronic structure properties of TiO2supercells containing substitutional nitrogen, interstitial nitrogen, or oxygen vacancies were evaluated to clarify the mechanisms under visible light. According to the formation energy, a substitutional N atom is better formed than an interstitial N atom, and the formation of an oxygen vacancy in N-doped TiO2is easier than that in pure TiO2. The calculated results have shown that a significant band gap narrowing may only occur in heavy nitrogen doping. With light nitrogen doping, the photocatalysis under visible light relies on N-isolated impurity states. Oxygen vacancies existence in N-doped TiO2can improve the photocatalysis in visible light because of a band gap narrowing and n-type donor states. These findings provide a reasonable explanation of the mechanisms of visible light photocatalysis in N-doped TiO2.

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