scholarly journals Pb-Free Cs3Bi2I9 Perovskite as a Visible-Light-Active Photocatalyst for Organic Pollutant Degradation

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 763 ◽  
Author(s):  
Bianca-Maria Bresolin ◽  
Carsten Günnemann ◽  
Detlef W. Bahnemann ◽  
Mika Sillanpää
Keyword(s):  
Visible Light ◽  
Transient Absorption ◽  
Organic Pollutant ◽  
Transient Absorption Spectroscopy ◽  
Advanced Materials ◽  
Organic Pollutant Degradation ◽  
Metal Halide Perovskite ◽  
Excellent Activity ◽  
Visible Light Active ◽  
Light Excitation

In our work, we employed Cs3Bi2I9 as a visible-light-active photocatalyst, synthesized with a low-temperature solvothermal method. The morphological and structural properties of the as-prepared perovskite were investigated, and the results were compared to previous studies to confirm its nature and the quality of the synthesis procedure. Transient absorption spectroscopy was applied in order to investigate the generation and lifetime of photogenerated charge carriers, revealing their formation after visible light excitation. The potential photocatalytic activity of the as-prepared metal halide perovskite was applied for the removal of Rhodamine B in aqueous solution, demonstrating an excellent activity of 93% after 180 min under visible-light irradiation. The current research aims to provide insights into the design of a new visible-light-active photocatalyst, Cs3Bi2I9, selected for its high application value in the field of advanced materials for light harvesting.

Enhancing visible light photocatalytic performance with N-doped TiO2 nanotube arrays assisted by H2O2

2019 ◽  
Vol 33 (01n03) ◽  
pp. 1940025 ◽  
Author(s):  
Chao Xiong ◽  
Shengsen Zhang ◽  
Yu Zhao ◽  
Min Zheng ◽  
Dongdong Hou ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Performance ◽  
Organic Pollutant ◽  
Electrochemical Anodization ◽  
Nanotube Arrays ◽  
Pollutant Degradation ◽  
Organic Pollutant Degradation ◽  
Acid Orange Ii ◽  
Photocatalytic Material ◽  
Visible Light Photocatalytic

N-doped TiO2 nanotube arrays were prepared by an electrochemical anodization method and subsequent ammonia annealing. Microstructures, morphology, optical properties and photocatalytic properties of the N-doped TiO2 nanotube arrays were measured and analyzed. In the degradation of Acid Orange II(AO-II), the photocatalytic degradation efficiency of the N-doped TiO2 nanotube arrays assisted by H2O2 are 12 times, 2 times and 5 times higher than TiO2 nanotube arrays, TiO2 nanotube arrays assisted by H2O2 and H2O2, respectively. Experimental results show that the N-doped TiO2 nanotube arrays is a promising photocatalytic material for organic pollutant degradation under visible light, especially under the assistance of H2O2.

scholarly journals Excited state dynamics for visible-light sensitization of a photochromic benzil-subsituted phenoxyl-imidazolyl radical

2019 ◽  
Vol 15 ◽  
pp. 2369-2379
Author(s):  
Yoichi Kobayashi ◽  
Yukie Mamiya ◽  
Katsuya Mutoh ◽  
Hikaru Sotome ◽  
Masafumi Koga ◽  
...  
Keyword(s):  
Visible Light ◽  
Rational Design ◽  
Materials Science ◽  
Transient Absorption ◽  
Life Sciences ◽  
Transient Absorption Spectroscopy ◽  
Back Reaction ◽  
Switching Speed ◽  
Wide Range ◽  
Potential Applications

Visible-light sensitized photoswitches have been paid particular attention in the fields of life sciences and materials science because long-wavelength light reduces photodegradation, transmits deep inside of matters, and achieves the selective excitation in condensed systems. Among various photoswitch molecules, the phenoxyl-imidazolyl radical complex (PIC) is a recently developed thermally reversible photochromic molecule whose thermal back reaction can be tuned from tens of nanoseconds to tens of seconds by rational design of the molecular structure. While the wide range of tunability of the switching speed of PIC opened up various potential applications, no photosensitivity to visible light limits its applications. In this study, we synthesized a visible-light sensitized PIC derivative conjugated with a benzil unit. Femtosecond transient absorption spectroscopy revealed that the benzil unit acts as a singlet photosensitizer for PIC by the Dexter-type energy transfer. Visible-light sensitized photochromic reactions of PIC are important for expanding the versatility of potential applications to life sciences and materials science.

ZnS quantum dot intercalated layered double hydroxide semiconductors for solar water splitting and organic pollutant degradation

2019 ◽  
Vol 7 (18) ◽  
pp. 11408-11422 ◽  
Author(s):  
Ali Reza Amani-Ghadim ◽  
Fatemeh Khodam ◽  
Mir Saeed Seyed Dorraji
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Water Splitting ◽  
Organic Pollutant ◽  
Pollutant Degradation ◽  
Solar Water Splitting ◽  
Organic Pollutant Degradation ◽  
Double Hydroxide ◽  
Oppositely Charged ◽  
Visible Light Photocatalytic

MIIZnAl-LDH/ZnS QD (MII = Co or Mn) nanocomposites were synthesized by assembling oppositely charged 2D LDH layers and ZnS QDs. The MIIZnAl-LDH/ZnS QDs exhibited enhanced visible light harvesting ability, considerable visible light photocatalytic activity and photostability.

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