Simple Method to Determine the Apparent Quantum Yield Matrix of CDOM Photobleaching in Natural Waters

2020 ◽  
Vol 54 (21) ◽  
pp. 14096-14106
Author(s):  
Xiaohui Zhu ◽  
William L. Miller ◽  
Cédric G. Fichot
Keyword(s):  
Quantum Yield ◽  
Natural Waters ◽  
Apparent Quantum Yield ◽  
Simple Method

Photolysis of uranium hexafluoride and some reaction variables affecting the apparent quantum yield

1979 ◽  
Vol 11 (5) ◽  
pp. 393-401 ◽  
Author(s):  
W.B. Lewis ◽  
F.B. Wampler ◽  
E.J. Huber ◽  
G.C. Fitzgibbon
Keyword(s):  
Quantum Yield ◽  
Uranium Hexafluoride ◽  
Apparent Quantum Yield

Controlling the visible-light driven photocatalytic activity of alloyed ZnSe–AgInSe2 quantum dots for hydrogen production

2020 ◽  
Vol 8 (26) ◽  
pp. 13142-13149 ◽  
Author(s):  
Ping-Yen Hsieh ◽  
Tatsuya Kameyama ◽  
Takayuki Takiyama ◽  
Ko Masuoka ◽  
Takahisa Yamamoto ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Quantum Yield ◽  
Hydrogen Production ◽  
Visible Light ◽  
Apparent Quantum Yield ◽  
Visible Light Driven

Alloyed ZnSe–AgInSe2 quantum dots were used as a photocatalyst for H2 production, showing an apparent quantum yield of 3.4% at 600 nm.

Remarkably high apparent quantum yield of the overall photocatalytic H2O splitting achieved by utilizing Zn ion added Ga2O3 prepared using dilute CaCl2 solution

2015 ◽  
Vol 51 (65) ◽  
pp. 12935-12938 ◽  
Author(s):  
Yoshihisa Sakata ◽  
Takuya Hayashi ◽  
Ryō Yasunaga ◽  
Nobuyuki Yanaga ◽  
Hayao Imamura
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Quantum Yield ◽  
High Photocatalytic Activity ◽  
Apparent Quantum Yield ◽  
Cacl2 Solution

Remarkably high photocatalytic activity for the overall H2O splitting was achieved by utilizing a Rh0.5Cr1.5O3(Rh; 0.5 wt%)/Zn(3 mol%)–Ga2O3 photocatalyst when Ga2O3 was prepared using dilute CaCl2 aqueous solution (0.001 mol l−1).

Highly-efficient cocatalyst-free H2-evolution over silica-supported CdS nanoparticle photocatalysts under visible light

2015 ◽  
Vol 51 (53) ◽  
pp. 10676-10679 ◽  
Author(s):  
Guiyang Yu ◽  
Longlong Geng ◽  
Shujie Wu ◽  
Wenfu Yan ◽  
Gang Liu
Keyword(s):  
Quantum Yield ◽  
Visible Light ◽  
Light Illumination ◽  
H2 Evolution ◽  
Apparent Quantum Yield ◽  
Highly Efficient ◽  
Cds Nanoparticle ◽  
Visible Light Driven

A silica-supported CdS nanoparticle photocatalyst exhibits excellent visible-light driven H2evolution activity without the use of a cocatalyst. The apparent quantum yield can reach 42% under 420 nm light illumination.

scholarly journals Variability of carbon monoxide and carbon dioxide apparent quantum yield spectra in three coastal estuaries of the South Atlantic Bight

2012 ◽  
Vol 9 (6) ◽  
pp. 6947-6985 ◽  
Author(s):  
H. E. Reader ◽  
W. L. Miller
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Quantum Yield ◽  
South Atlantic ◽  
South Atlantic Bight ◽  
The South ◽  
Apparent Quantum Yield ◽  
Data Set ◽  
Direct Production ◽  
Coastal System

Abstract. The photochemical oxidation of oceanic dissolved organic carbon (DOC) to carbon monoxide (CO) and carbon dioxide (CO2) has been estimated to be a significant process with global photoproduction transforming petagrams of DOC to inorganic carbon annually. To further quantify the importance of these two photoproducts in coastal DOC cycling, 38 paired apparent quantum yield (AQY) spectra for CO and CO2 were determined at three locations along the coast of Georgia, USA over the course of one year. The AQY spectra for CO2 were considerably more varied than CO. CO AQY spectra exhibited a seasonal shift in spectrally integrated (260 nm–490 nm) AQY from higher efficiencies in the fall to less efficient photoproduction in the summer. While full-spectrum photoproduction rates for both products showed positive correlation with pre-irradiation UV-B sample absorption (i.e. chromophoric dissolved organic matter, CDOM) as expected, we found no correlation between AQY and CDOM for either product at any site. Molecular size, approximated with pre-irradiation spectral slope coefficients, and aromatic content, approximated by the specific ultraviolet absorption of the pre-irradiated samples, were also not correlated with AQY in either data set. The ratios of CO2 to CO photoproduction determined using both an AQY model and direct production comparisons were 23.2 ± 12.5 and 22.5 ± 9.0, respectively. Combined, both products represent a loss of 2.2 to 2.6 % of the DOC delivered to the estuaries and inner shelf of the South Atlantic Bight yearly, and 5 to 6 % of the total annual degassing of CO2 to the atmosphere. This result suggests that direct photochemical production of CO and CO2 is a small, yet significant contributor to both DOC cycling and CO2 gas exchange in this coastal system.

Hydrogenated nanotubes/nanowires assembled from TiO2 nanoflakes with exposed {111} facets: excellent photo-catalytic CO2 reduction activity and charge separation mechanism between (111) and (1̄1̄1̄) polar surfaces

2019 ◽  
Vol 7 (24) ◽  
pp. 14761-14775 ◽  
Author(s):  
Junfang Liu ◽  
Bin Liu ◽  
Yan Ren ◽  
Yukun Yuan ◽  
Hua Zhao ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Charge Separation ◽  
Co2 Reduction ◽  
Separation Mechanism ◽  
Apparent Quantum Yield ◽  
Reduction Activity ◽  
Polar Surfaces

The apparent quantum yield for CH4 evolution of the hydrogenated TiO2 nanotubes/nanowires is as high as 17.4%, which is higher than that of all the TiO2 based photocatalysts reported until now.

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